2024 | DARKO

When selecting a mining dust collector, several factors require consideration to ensure the equipment's effectiveness and compliance with environmental standards. Here are some key points and recommendations:

1.Environmental Requirements

First, understand the local environmental agency's emission standards and specific dust control requirements. The location and distance of different dust sources affect the design and installation of dust collection hoods. Ensure overall or local sealing by choosing durable materials that facilitate maintenance.

2.Crusher and Discharge Chute

Determine the number of crushers, the width of the discharge belt, and the direction of the feed opening. This information is crucial for designing the dust collection system.

3.Vibrating Screen Parameters

After material crushing, it must pass through a vibrating screen. Knowing the specifications of the screen surface, the number of layers, and the width of the discharge belt is essential.

4.Equipment Layout

Measure the distance between the center of the vibrating screen and the crusher to decide the placement of the colector de polvo.

5.Air Velocity Design

Typically, design the air velocity for the integrated hood between 1.5 and 2 meters per second, while the duct velocity should be around 18 to 20 meters.

6.Filtering Velocity Selection

The design velocity of the mining dust collector should not exceed 1 meter per minute. If the emission requirement is below 30 milligrams, increase the airflow. In simple terms, higher emission standards require a reduction in filtering velocity inside the dust collector.

7.Equipment Dimensions

Choose the size of the mining dust collection equipment based on the actual site conditions to ensure effective operation.

Importance of Filtering Velocity

Filtering velocity significantly impacts the efficiency of the dust collector. It is defined as the ratio of the actual gas flow rate to the filtering area. Higher filtering velocity can reduce the necessary filtering area, thus lowering costs for filter bags and initial investments. However, excessive pressure in the dust collector may lead to loss of airflow and inadequate cleaning, increasing bag wear and shortening the equipment's lifespan.

From the working principle of bag dust collectors, filtering velocity also affects dust collision and dispersion. When selecting a dust collector, consider the size, distribution, and content of the captured dust particles. If the dust collection efficiency decreases, filtering velocity will also drop. Therefore, it is crucial to select the appropriate filter bags and cleaning methods.

Design and Performance Features

Based on past experience, for mechanical dust from mining operations, a filtering velocity of 1.2 meters per minute is typically chosen. This choice helps achieve low equipment operating pressure, good ventilation, and thorough cleaning. Additionally, the mining dust collector uses differential pressure automatic control for reverse cleaning, adjusting the cleaning cycle based on the inlet dust concentration. This method is more reasonable and reliable than the timed cleaning of pulse bag dust collectors.

The dust collector's housing design follows the flow pattern of a cyclone dust collector. The dust-laden airflow enters tangentially, creating a local cyclone effect that reduces the load on the filter bags. This equipment is suitable for various mining processes, such as drilling, rock blasting, transportation, and crushing, effectively handling generated dust and minimizing environmental pollution.

Conclusión

Mining dust collectors play a vital role in mining and mineral processing. Through scientific design and selection, they can ensure dust control meets health and emission standards. Their efficient and automated features not only enhance operational efficiency but also help reduce operating costs. Choosing the right dust collection equipment is essential for achieving sustainable development.

If you have any questions about mining dust collectors or need further information, please feel free to Contacto. We are here to provide you with professional support and services.

MÁS

Optimization of the Clinker Bulk Loader Discharge Structure

12/30

2024

12/30/2024

En el cemento industry,the efficient operation of cargador de clínker a granel,colector de polvo, and related equipment is crucial. Company S operates a cement clinker production line with a capacity of 450 tons per hour, equipped with four bulk loading systems. Operators control the discharge pipe using a hoist, powered by a turbine reducer, to accommodate vehicles of different heights. However, during actual operations, the equipment faced several issues that impacted production efficiency and environmental hygiene.

Identified Problems

En clinker bulk loading discharge system consists of four sections of telescoping main pipes and four sections of telescoping dust collection pipes. When loading, the positions of the telescoping joints and hooks cause dust to escape from gaps around the discharge pipe, leading to the accumulation of dust around the equipment. This issue worsens during windy weather. Additionally, after three months of use, the walls of the telescoping pipes suffer severe wear. Operators frequently encounter problems such as pipe misalignment and hook wear. These issues complicate maintenance and increase downtime, significantly affecting clinker loading efficiency and raising maintenance costs and labor intensity.

Rectification Measures

To address these issues, Darko's technical team conducted a thorough analysis and proposed a series of corrective measures:

1) Redesigning the Discharge Device

To improve the sealing and reduce dust emissions, the technical team redesigned the clinker discharge device . The new design incorporates wear-resistant pipes made from composite steel plates. The dust collection outlets are positioned on both sides of the top of the discharge pipe. This internal loading and internal airflow design effectively reduces dust emissions.

2) Improving Sealing Performance

To address previous issues of air leakage and dust overflow, the technical team connected the main pipe with steel cables, creating a flexible structure. During installation, they added sealing gaskets between components to maximize the negative pressure of the telescoping pipe hood. This prevents external air from entering the dust collection system and enhances dust collection efficiency .

3) Regular Maintenance and Inspection

Due to the high dust concentration and large processing volume handled by the bag dust collector, and the tendency of clinker dust to form clumps, especially in wet weather, the technical team established a regular inspection plan. This ensures the dust collection system operates normally. Regular checks help identify and resolve potential problems promptly, ensuring continuous and efficient equipment operation.

Post-Modification Results

After the modifications, the clinker bulk loader transformed into an internal loading and dust collection system, eliminating dust emissions caused by hood blockages. Since October 2021, the problem of pipe misalignment has not recurred, effectively resolving long-standing dust overflow issues. Furthermore, the modifications significantly improved the working environment for employees and enhanced the company's economic benefits and overall environmental conditions.

Through this transformation, Darko not only improved equipment performance but also created a safer and cleaner working environment for employees. This showcases our ongoing commitment to environmental protection and efficiency. We will continue to focus on technological innovation, providing high-quality bulk loaders and cement equipment solutions.If you are interested in our products or solutions, please feel free to Contacto.

MÁS

Analysis of Air Leakage in Cement Kiln Systems

12/27

2024

12/27/2024

1. Internal Air Leakage in Preheater Systems

Many companies face problems with air leakage in the kiln tail preheater. From level I to level V, the flap dampers in the discharge pipes often malfunction. They may become stuck, fail to move, or not operate correctly, causing the dampers to remain open. This allows hot air from the lower stage to directly enter the upper preheater, resulting in a short circuit in the airflow. This issue is often hard to detect, but operators can sense pressure changes through manual testing.

1.1 Damper Open State

The dampers may remain open due to light weights on the counterweights or improper positioning. This results in insufficient pressure to close the dampers effectively.

1.2 Pressure Rod Suspended

Operators sometimes use wire to suspend the pressure rod, keeping the damper open. This usually happens when blockages frequently occur in the kiln. Addressing these blockages takes time and can lead to kiln shutdowns. To prevent large material from clogging the discharge pipe, operators resort to this method. Although it causes air leakage, it reduces the chances of blockage significantly. Over time, management may accept this practice, believing minor air leakage is acceptable as long as major operational problems do not arise.

1.3 Worn or Unlubricated Bearings

Worn bearings can hinder damper movement. If operators do not check or lubricate the bearings regularly, wear will accelerate.

1.4 Dust in Bearings

Poor sealing allows dust to enter the bearings, forming sludge with the oil, which can lead to the shaft seizing.

1.5 Worn or Detached Damper Plates

Damper plates may wear down over time due to material abrasion, especially at high temperatures, leading to improper closure and air leakage. In some cases, plates may break or fall off entirely.

1.6 Separation of Shaft and Damper Plate

Over time, the connection between the shaft and damper plate may loosen. This prevents the damper from moving with the shaft, compromising its ability to seal.

1.7 Risks of Internal Air Leakage

Malfunctioning dampers lead to incomplete closure, resulting in internal air leakage. This causes high-temperature gases from the lower preheater to short-circuit, reducing the effectiveness of raw material heating and lowering the quality of the clinker. It also increases thermal and coal consumption.

2. External Air Leakage

External air leakage occurs when ambient air enters the kiln and preheater systems through improper channels. This entry causes internal gas temperatures to drop and increases heat consumption. Major causes include poorly sealed kiln doors, observation holes, cleaning holes, and loose flange connections.

2.1 Air Leakage at the Kiln Head

Gaps between the kiln door and head can allow cold air to enter, reducing the front temperature and affecting coal combustion.

2.2 Air Leakage at the Kiln Head Seal

Worn seals or misaligned sealing mechanisms can create gaps that let cold air in, impacting the temperatures of secondary and tertiary air.

2.3 Deformation of the Kiln Mouth

Pursuing high operational rates blindly can lead to the loss of protective parts, compromising seals at the kiln mouth.

2.4 Poorly Sealed Inspection Holes

Operators may open inspection holes for convenience, failing to seal them properly afterward, which leads to significant air leakage.

2.5 Leakage at the Bottom of the Humidification Tower

Loose seals at the inspection holes in the humidification tower can let in cold air, affecting system pressure and increasing energy consumption.

3. Analysis of Leakage Causes

Air leakage is common in kiln and preheater systems, but many companies do not take it seriously. First, a lack of awareness about the dangers of air leakage leads to poor management. Second, many companies do not recognize the technical impacts of leakage and lack effective solutions.

4. Consequences of External Air Leakage

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4.1 Increased Heat Loss

Any point of air leakage can increase heat loss in the system, raising the energy consumption of clinker production.

4.2 Higher Electrical Consumption

Leakage forces the system to use more energy, increasing coal consumption and driving up electrical costs.

4.3 Lower Temperatures

Air leakage reduces temperatures in the kiln, disrupting thermal balance and affecting the quality of clinker.

4.4 Reduced Air Temperature and Volume

Leakage lowers the temperature of the incoming air, slowing coal combustion and affecting the quality of the clinker.

4.5 Clogging in Preheater Systems

Leakage can cause rapid temperature drops, leading to material hardening and clogging within the preheater and its pipes.

Conclusión

Companies must prioritize addressing air leakage in cement kiln systems. They should enhance management practices, conduct regular inspections, and maintain good seals to improve production efficiency and product quality.

For more information, please Contacto. Darko is committed to providing effective solutions to help your business enhance production efficiency.

MÁS

Optimizing Bag Filter Systems: Key Dust Hood Design Elements

12/26

2024

12/26/2024

The design of the dust hood directly impacts the airflow and pressure requirements of the entire sistema de recogida de polvo. A well-designed dust hood can significantly reduce the number of ducts, decrease the footprint of the dust collection equipment, and lower the power required for the fans. This not only reduces maintenance and energy consumption but also effectively lowers the overall installation and operating costs of the system.

To assess the effectiveness of existing dust hoods, it is essential to clarify their specific requirements first.

1. Dust Hood Design

The design of the dust hood aims to balance multiple factors to achieve optimal system performance. These factors include maximizing emission control, minimizing airflow requirements, reducing pressure loss (energy consumption), and minimizing impacts on process efficiency and worker productivity.

Since these factors are interrelated, manufacturers should conduct a comprehensive review of the dust-generating processes, the dust itself, and the interaction between operators and processes to determine the performance requirements of the dust hood. Additionally, the design must identify and consider factors such as dust particle size, process momentum or energy, and any potential dust hazards.

For example, heat generated during welding causes surrounding air and smoke to rise quickly. This movement or energy must be considered in the dust hood design. At the same time, designers should pay attention to external air sources that may affect hood performance, such as mechanical movement, material movement, operator activities, and natural indoor airflow.

It is important to note that excessive air extraction can negatively impact the design and performance of the dust hood. For instance, excessive airflow can disrupt the protective gas in the welding torch, potentially reducing welding quality. In CNC machining applications, too much air extraction can lead to more oil mist being captured, shortening filter lifespan or increasing maintenance frequency.

Once the design parameters are collected and the application context is understood, manufacturers can use this information to determine the capture velocity needed for effective dust collection.

2. Choosing the Right Type of Dust Hood

In practice, local ventilation (capturing dust at the source or nearby) is the best choice because it requires less energy and limits dust dispersion in the work environment. Different applications require different styles or methods of dust hoods. Therefore, matching the right type of dust hood to specific applications is crucial for achieving ideal performance.

Although dust hoods vary in size and shape, they mainly fall into three basic types: external hoods, enclosed hoods, and capture hoods.

External Dust Hoods

External dust hoods capture airborne dust generated from points outside the hood. Common forms include extraction arms, slot hoods, and simple open ducts. These hoods work best when dust is released at low momentum and within the hood's effective range. Typical applications include processes like welding.

The advantage of external dust hoods is that they usually require less airflow, leading to lower energy consumption. Their design is simpler, and the manufacturing and installation costs are lower. However, external dust hoods need larger airflow when positioned far from the emission source, meaning they must often be relatively close to operate efficiently.

Best practices for using external dust hoods include combining them with peripheral flanges and a gradually tapered design from the hood to the duct to enhance capture velocity and reduce pressure loss at the hood.

Enclosed Dust Hoods

Enclosed dust hoods surround the emission source with one side fully or partially open. These hoods are suitable for situations where local ventilation is impractical due to interference, part size, or high emission rates. Common applications include sandblasting, spray booths, and CNC machining.

The main advantage of enclosed dust hoods is their ability to effectively control dust inside, preventing it from spreading outside and protecting worker safety. They can effectively control larger spaces by drawing in air through small openings. However, enclosed designs are not always practical or cost-effective, especially when workers need direct access to parts, which may require additional personal protective equipment.

When designing enclosed dust hoods, it is crucial to ensure that the entering velocity at all open areas is sufficient to prevent dust overflow. A proper balance must be found, as excessive air extraction can affect pressure and increase the load on dust collection equipment, shortening filter lifespan.

Capture Dust Hoods

Capture dust hoods are designed to use power or the dust's own forces to capture it inside the hood. Common examples include side hoods that capture wheel emissions using inertial forces or umbrella-shaped hoods that capture dust through thermal uplift.

The advantage of capture dust hoods is that they can effectively capture fumes near the source using process parameters, allowing for low airflow. However, these hoods rely on stable process and environmental conditions to operate correctly.

3. Considerations for Dust Hood Design

Dust hood design is a critical part of dust collection system design. A well-designed dust hood can effectively control dust dispersion while using a smaller airflow. Conversely, a poorly designed hood may fail to achieve the desired results.

Therefore, the setup of dust hoods should follow these basic principles:

Prevent Dust Dispersion: The setup should aim to prevent dust from spreading to the surrounding environment, utilizing the motion of polluted airflow as much as possible for suction.
Avoid High Dust Areas: The hood should not be placed in areas with high dust concentrations to avoid inhaling large amounts of dust.
Leave Buffer Space: The hood should allow for some space to reduce positive pressure, and the contraction angle when connecting to ducts should not exceed 60°.
Enclose Dust Sources: The hood should enclose dust sources as much as possible to limit dust dispersion and facilitate dust capture, thereby reducing airflow needs.
Simple Structure: The dust hood should have a simple structure for easy installation, not interfere with process operations, and allow for convenient maintenance.

By following these principles, dust hood design can effectively enhance the performance of dust collection systems and ensure worker health and safety.

For more information or to consult our professional services, please feel free to Contacto. We look forward to collaborating with you to improve your production environment!

MÁS

Single Machine Bag Dust Collector Installation Guide

12/25

2024

12/25/2024

Installing a single machine bag dust collector is a systematic project. It requires careful preparation and proper operation. Here are the detailed installation steps to ensure you can efficiently and safely complete the installation.

1. Preparación

Before installing the single machine bag dust collector, you need to do the following:

Choose a Location: Select a suitable position based on the layout of the production site. Ensure it is close to the inlet and outlet pipes for easy connection.

Follow Installation Instructions: After determining the location, install the main unit according to the manual. This includes installing the base, main unit, and bag components.

Clean the Site: Ensure the installation site is clean and free of debris and obstacles to facilitate smooth installation.

Check Components: Inspect all parts of the dust collector to ensure they are undamaged. Replace any damaged parts promptly.

Prepare Tools: Gather necessary installation tools and materials, such as screwdrivers, wrenches, and lifting equipment.

2. Install the Foundation

Choose a suitable installation location and foundation structure. Ensure the foundation is stable and level to support the weight of the colector de polvo and absorb vibrations during operation.

Place the Base: Set the dust collector's base on the foundation and use a level to adjust it to a horizontal position.

3. Install the Ash Hopper

Place the ash hopper on top of the base. Ensure it connects tightly to the base without any wobbling.

Seal the Connection: Use sealing materials to seal the connection between the ash hopper and the base to prevent dust leakage.

4. Install the Filter Bag Chamber

Lift the filter bag chamber above the ash hopper. Ensure both parts are aligned.

Secure the Connection: Use special clamps or bolts to tightly connect the filter bag chamber to the ash hopper. Ensure the connection is sealed reliably.

5. Install the Pulse Cleaning System

Install the pulse pipes above each bolsa de filtro. Ensure the pipes are aligned with the bags.

Connect Air Pipes: Connect the compressed air pipeline to ensure smooth delivery of compressed air to the pulse pipes.

Install the System: Install the pulse valves and control system to ensure the pulse cleaning system can operate automatically as programmed.

6. Install Inlet and Outlet

After installing the main unit, connect the inlet and outlet pipes according to the production line requirements. Ensure the connections are secure.

Connect Inlet Pipe: Connect the inlet pipe to the dust collector's inlet, ensuring a tight seal to prevent dust leakage.

Connect Outlet Pipe: Connect the outlet pipe to the dust collector's outlet, ensuring it is aligned to reduce airflow resistance.

7. Install Electrical System

Refer to the electrical diagrams to properly connect the power and control circuits of the dust collector.

Confirm Voltage: Before connecting the dust collector to power, confirm that the voltage matches the specifications in the manual. If there is a distribution box, connect the appropriate power lines.

Check Connections: Ensure that all electrical connections are secure and reliable for normal operation of the equipment.

8. Debugging and Testing

After completing all installation work, debug and test the single machine bag dust collector.

Function Check: Verify that all functions of the equipment are normal, such as the shaking of the filter bags and the ash discharge from the hopper.

Run Test: Observe the operating status and emissions of the equipment to ensure the dust removal effect meets the requirements.

9. Maintenance and Care

After installation, regularly maintain and care for the single machine bag dust collector. This includes replacing filter bags and cleaning the ash hopper.

Ensure Long-Term Operation: Follow the manufacturer's recommendations to use appropriate filter bags and sealing materials for stable long-term operation of the equipment.

By following these steps, users can correctly and safely complete the installation of the single machine bag dust collector. During the installation process, always pay attention to safety and detail to ensure normal operation and optimal performance of the equipment.For more information or support, please feel free to Contacto.

MÁS

Bag Filter Dust Collector Cooling Measures

12/23

2024

12/23/2024

En bag filter dust collector effectively purifies air and removes dust from industrial smoke. However, when the smoke temperature exceeds the maximum tolerance of the filter bags, cooling measures are necessary. Here are several specific cooling methods:

1. Natural Cooling

Natural cooling extends the length of the gas transport pipe. This method uses natural convection and radiation heat dissipation between the pipe and surrounding air. It typically suits metal pipes and can use an S-shaped design to increase spacing. While this method is simple, its cooling effect is weak and it occupies considerable space.

2. Indirect Cooling

Indirect cooling employs a heat exchanger. High-temperature smoke flows through one side of a steel pipe, while cold water or outdoor air flows through the other side. The two do not directly contact each other, which lowers the smoke temperature. This method does not increase the smoke volume. As the temperature drops, the actual flow also decreases, and the moisture content remains unchanged. The heat can be recovered for use.

3. Spray Direct Cooling

In spray direct cooling, water forms a fine mist that sprays into high-temperature smoke. The mist evaporates and absorbs a significant amount of heat, quickly cooling the smoke. This method requires minimal equipment and has low investment costs, while also providing rapid cooling.

4. Mixing Cool Air for Direct Cooling

Installing a T-pipe on the inlet of the bag filter dust collector allows outside air to enter the flue and mix with the smoke. This method quickly reduces smoke temperature and requires only simple components like a T-pipe and flow control valve.

5. Cold Air Valve

The installation of a cold air valve prevents high-temperature smoke from entering the bag filter dust collector. This valve operates from an automated high-temperature signal, adjusting the amount of air entering the smoke duct to lower the temperature within a safe range. Normally, the valve remains closed, opening only when the smoke temperature exceeds the bag's tolerance. It is important to position the cold air valve away from the dust collector to ensure proper mixing of hot and cold air.

6. Waste Heat Recovery

Waste heat recovery captures heat from the smoke in the bag filter dust collector and converts it into usable energy. This method often applies to large industrial kilns. It is safe, reliable, and has a long service life. It effectively improves energy efficiency and reduces waste.

By implementing these cooling methods, you can effectively lower the smoke temperature in bag filter dust collectors, ensuring normal operation and improving dust removal efficiency. Choosing the right cooling solution is crucial for optimizing industrial production and protecting the environment.

If you have any questions about cooling measures for bag filter dust collectors or related topics, please feel free to Contacto. We are committed to providing you with professional support and service!

MÁS

Differences and Applications of On/Off and Regulating Electric Butterfly Valves

12/20

2024

12/20/2024

In the field of automation control, electric butterfly valves are commonly used. They mainly fall into two categories: on/off valves and regulating valves. These two types differ significantly in function, application, and control methods.

On/Off Electric Butterfly Valves

Definition and Function

On/off electric butterfly valves serve a basic function: they allow for full opening or closing. They use electric actuators to control the valve's position and are typically used in situations that require quick switching. These valves are essential in pipeline systems, primarily controlling the flow of media.

Escenarios de aplicación

On/off electric butterfly valves are suitable for simple flow control of fluids such as water and oil. They frequently appear in applications like water treatment, supply systems, and HVAC (heating, ventilation, and air conditioning). Their straightforward design makes installation and maintenance relatively easy.

Regulating Electric Butterfly Valves

Definition and Function

Regulating electric butterfly valves offer both on/off functionality and flow regulation. They can adjust the valve's opening based on input control signals (such as 4-20mA or 0-10V), allowing for precise control of fluid flow.

Escenarios de aplicación

Regulating electric butterfly valves are widely used in industrial processes requiring flow adjustment, including the chemical, pharmaceutical, and food processing industries. They provide high control precision in complex operating conditions, ensuring stable system performance.

Principales diferencias

Control Methods

On/Off Electric Actuator: This type only supports full opening and closing, with no flow adjustment capabilities. It operates in an open-loop control mode, suitable for simple fluid switching.
Regulating Electric Actuator: This type allows for precise control of valve openings. It operates in a closed-loop control mode, enabling flow adjustment based on actual needs.

Applicability

On/off electric butterfly valves work best in situations with minimal flow variation. In contrast, regulating electric butterfly valves are ideal for applications requiring significant flow adjustments and precise control.

Selection Considerations

When choosing an electric butterfly valve, consider whether to use an on/off or regulating type based on specific application needs. In addition to the valve body size, pressure, and material, also take into account:

Power supply parameters (voltage, phase, frequency)
Control mode requirements
Flow adjustment precision

Conclusión

On/off and regulating electric butterfly valves differ significantly in function and application. On/off valves are primarily for simple media switching, while regulating valves provide precise flow control. Selecting the appropriate valve type based on actual needs will enhance system efficiency and stability. When choosing, consider all relevant factors to ensure the selected valve meets your specific requirements.

For more information about electric butterfly valves, feel free to contact us. Darko is here to assist you!

MÁS

U-type Screw Conveyor: Efficient Transport Solution

12/19

2024

12/19/2024

En Transportador de tornillo en U is made of high-quality steel. It is widely used in various industries, including chemicals, construction, grano, and food. This equipment is suitable for transporting high-temperature powders or solid particles. Its flexible design and efficient performance make it an ideal choice for material transport. Whether for horizontal, inclined, or vertical transport, the U-type screw conveyor provides reliable solutions to help customers improve productivity.

Design and Specifications

The U-type screw conveyor has a diameter range of 200 mm to 500 mm. It comes in five specifications, with lengths from 4 meters to 70 meters. Users can choose from increments of 0.5 meters. The transmission parts use floating connections, and the bearing design features a universal joint structure. This allows the system to rotate freely within a certain range, avoiding material blockages.

Principio de funcionamiento

The U-type screw conveyor works by using a rotating screw to push materials along a fixed casing. The bearings at the head and tail are located outside the casing. The hanging bearing has a dust-proof sealing device, ensuring efficient operation. Users can select suitable models based on different process requirements, such as horizontal slow screw conveyors or vertical fast screw conveyors.

Características principales

The U-type screw conveyor has several key features:

Compact Size and High Speed: It ensures fast and even material transport.
Strong Rigidity and Good Sealing: It is made of seamless steel pipes, with a sturdy and well-sealed casing.
Low Noise: The discharge end has a cleaning device, and the layout of inlets and outlets is flexible.
High Load Capacity: It is safe and reliable for various working conditions.
Fácil mantenimiento: The equipment has a long service life and is easy to install and maintain.

Usage Notes

When using the U-type screw conveyor, users should follow these guidelines to ensure efficient operation and extend the equipment's life:

Choose the Right Conveyor Belt: Select the appropriate type, structure, and layers based on usage and equipment compatibility.
Keep It Clean: Maintain cleanliness during transport and storage. Avoid direct sunlight, rain, and contact with organic solvents.
Avoid Mixing Different Specifications: Do not connect different types and specifications of conveyor belts. Use adhesive connections whenever possible.
Control the Running Speed: Do not exceed a speed of 2.5 meters per second. Use low speeds to reduce wear.
Select Suitable Components: Choose rollers and brackets according to design specifications.
Provide Adequate Buffering: Use buffer rollers and soft side boards to prevent material leakage and damage to the conveyor belt.

Maintenance and Testing Notes

After maintenance, users should pay attention to the following during testing:

Maintain Gap Between Components: Ensure the gap between the bearing end face and the connecting flange meets specifications based on screw diameter.
Ensure Equal Gaps: The gap between the casing wall and the screw should be equal and within the allowable range.
Install Suspended Bearings Correctly: Place the suspended bearing at the midpoint of the connecting shaft, ensuring proper gaps.
Check for Oil Leaks: If oil leaks are found, adjust the seals to stop the leaks.

Application and Limitations

The U-type screw conveyor is powerful, but it is not suitable for transporting materials that easily spoil, are highly viscous, or tend to clump. Such materials may stick to the screw during transport, preventing forward movement and causing blockages at the bearing. Therefore, users should consider material characteristics and working environments when selecting a conveyor.

If you are interested in the U-type screw conveyor or other conveying equipment, Darko specializes in high-quality conveying solutions to meet your needs. Please feel free to Contacto. We are here to help you find the best conveying solutions.

MÁS

Corrosion Causes and Prevention in Flue Gas Desulfurization Systems

12/18

2024

12/18/2024

Flue gas desulfurization refers to the process of removing sulfur oxides (SO₂ and SO₃) from flue gas or other industrial waste gases. This technology plays a crucial role in controlling environmental pollution and improving air quality. However, flue gas desulfurization systems face corrosion issues during long-term operation. Therefore, effective anti-corrosion measures are essential.

I. Overview of Construction Methods

The glass flake resin anti-corrosion material consists of dispersed glass flakes mixed with a viscous resin to form a paste-like composite. The application process resembles building plastering. Workers use trowels and scrapers to apply the material to the protected surface at the required thickness. After applying, they remove bubbles and compress the material to arrange the glass flakes in a specific direction, allowing it to cure and set. The differences in properties between resin and cement materials make the application more challenging.

II. Main Characteristics of Construction

Manual Operation: The application of glass flake resin is manual. The quality of the work largely depends on the skills and proficiency of the workers.
Surface Quality Control: The quality of the anti-corrosion layer, the arrangement of glass flakes, and the thickness depend on the worker's technical level and experience.
Sealing Requirements: The glass flake anti-corrosion layer must be completely sealed, especially at ends, joints, and corners. To prevent stress concentration and misalignment of flakes, reinforcing measures such as glass cloth should be used.
Mixing Equipment: Mixing equipment should be available during construction to minimize the formation of air bubbles.
Safety Protection: The working environment for glass flake resin is harsh and poses fire and health hazards. Therefore, safety measures are crucial.

III. Structural and Surface Requirements for the Protected Metal Shell

Strength and Rigidity: The protected metal shell must possess sufficient strength and rigidity to prevent damage to the anti-corrosion layer during transport, installation, and construction.
Construction Conditions: The structure of the metal shell must meet construction requirements and allow for manual application.
Welding Requirements: All structural components that require welding (or riveting) must be completed before construction. If welding is necessary afterward, appropriate measures must be taken. All external pipeline flanges should be open, and the equipment must pass inspection according to design specifications.
Maintenance Conditions: Equipment that contains internal components and requires frequent maintenance must be suitable for installation and repair without damaging the lining.
Welding Structure: The metal shell should primarily use welded structures. If riveting is necessary due to special circumstances, countersunk rivets should be used.
Surface Treatment: The surfaces of the metal shell must be clean and smooth, free of weld slag and burrs. Welded areas should be flat, with protrusions not exceeding 1mm. If they exceed this height or are rough, they should be ground down with a grinder.
Sandblasting: The metal shell must undergo strict sandblasting and rust removal.
Pre-Construction Completion: All processing, welding, pressure tests, and leak tests must be completed before construction. After construction, no welding is allowed on the shell.

By following these measures, we can effectively enhance the anti-corrosion performance of flue gas desulfurization systems, extend the equipment's lifespan, and ensure the safe and stable operation of the system.

Contacte con nosotros

If you have any questions about the anti-corrosion measures for flue gas desulfurization systems or other related products, please feel free to Contacto. Darko is dedicated to providing high-quality anti-corrosion solutions to help businesses achieve sustainable development.

MÁS

Maintenance Guide for Clinker Bulk Loader

12/17

2024

12/17/2024

Clinker bulk loaders are essential in various industries, including potencia, construction, chemicals, and agriculture. They efficiently load dry powdery and granular materials into vehicles and ships, significantly improving loading efficiency and reducing dust pollution.

Equipment Structure and Working Principle

Clinker bulk loaders consist of several key components, including the main suction pipe and steel cables. These parts connect to form a flexible structure. The machine operates in conjunction with the feeding system below the storage silo. When the vehicle is full, the loading process stops automatically, achieving automated loading and unloading.

Key components include:

Discharge Gate: Controls the flow of material during loading.
Conveying Chute: Ensures smooth transfer of materials.
Elbows and Connecting Pipes: Direct the flow of materials.
Dust Collector: Effectively controls dust and keeps the working environment clean.
Chute Fan: Helps material flow and enhances loading efficiency.

The discharge head of the bulk loader can extend up to 1.6 meters, accommodating different vehicle types. The design ensures that no dust escapes during loading, protecting the health of operators.

Features of Clinker Bulk Loaders

1.Automated Control: Enables smart operation and reduces labor costs.

2.High Loading Efficiency: Optimized design enhances work efficiency.

3.Compact Size: Saves space and fits various operating environments.

4.Convenient Operation: Works well with other equipment to improve overall efficiency.

Common Faults and Solutions

1. Poor Dust Collection

Solution: Check if the dust collection valve opens simultaneously with loading. Replace the lifting soft connection if necessary.

2. Lifting Motor Does Not Work

Check:

The power supply and control circuit.
The limit switch.
If the lifting cone pipe is blocked by dust.
Mechanical issues, such as a jammed steel cable.

3. No Discharge During Loading

Check:

If the pneumatic valve is open; inspect the air line.
If cement is clumped inside the silo; clear the discharge port.
If the Roots blower is operating correctly.

Usage and Maintenance Tips

1.Regular Oil Changes: Add oil to the reducer before use. Change to fresh oil after one month, then once a year thereafter.

2.Check Switches Regularly: Inspect the position of the rope switch and limit devices. Replace them immediately if they fail.

3.Inspect Steel Cables: Check the pulley cables regularly. Replace them if damaged.

4.Replace Dust Collection Hose: Inspect the flexible dust collection hose for aging or damage. Replace it promptly to maintain dust collection efficiency.

5.Check Solenoid Valves: Regularly inspect solenoid valves to prevent failures.

6.Replace Inner Sleeve Regularly: Based on the grinding characteristics of materials, replace the steel inner sleeve to prevent excessive wear and deformation.

7.Maintain Negative Pressure: Ensure the system operates under negative pressure during loading. This keeps the dust collection equipment functioning properly.

8.Check Discharge Head Rigging: Regularly inspect the discharge head rigging to ensure balance. Do not stand directly under the discharge head.

Darko’s Advantages

Darko offers high-quality equipment, extensive production experience, and technical expertise. We are committed to providing excellent after-sales service. Our goal is to help customers optimize their production processes and improve work efficiency. If you have any questions or needs regarding clinker bulk loaders, please feel free to Contacto.

MÁS

Boiler Bag Dust Collector Renovation Case

12/16

2024

12/16/2024

In industrial production, the boiler bag dust collector plays a crucial role in reducing dust emissions and protecting the environment. Recently, we conducted a comprehensive inspection and analysis of a specific dust collector's operation. We found several issues that affected the equipment's efficiency and hindered environmental protection goals. This article will analyze the operational problems of the boiler bag dust collector and their causes. We will also propose corresponding corrective measures to enhance the equipment's performance and ensure efficient and stable operation.

1. Emission Concentration Not Up to Standard

The designed emission concentration is 50 mg/m³. However, on-site tests show much higher levels.

1.1 Reasons for Non-Compliance

1.1.1 Excessive Air Velocity

High air velocity causes some dust to pass through the filter media and be discharged directly. According to the original design, the online cleaning airflow reaches 1.09 m/min, while the offline cleaning airflow reaches 1.25 m/min.

1.1.2 Damaged Bags

Bag damage results from improper material or installation, leading to air leaks. We observed uneven dust discharge below the flower plate, with some bags even making contact. Under expansion during reverse blowing, bags are prone to wear. Additionally, misalignment between nozzles and bags can accelerate bag damage.

1.1.3 Air Leakage

The equipment experiences air leakage, especially at the flower plate, allowing dust to bypass the bags. We found a significant amount of dust in the clean room.

1.1.4 High Dust Concentration

The test report indicates that the coal used in the boiler differs significantly from the designed type. The ash content is high, and the coal size is small (with a high proportion below 1 mm), resulting in increased coal input and total ash volume. This further raises the dust concentration at the dust collector's inlet, causing bag overload.

2. Excessive Operating Resistance

The designed resistance is <1300 Pa, while the measured data is around 1500 Pa.

2.1 Reasons for High Resistance

2.1.1 Fast Design Air Velocity

The filtering air speed is directly proportional to resistance; higher speeds lead to higher resistance.

2.1.2 Issues with the Pulse Jet System

Misalignment between nozzles and bags prevents effective reverse blowing, causing severe dust accumulation on the bags and increasing resistance. The small diameter of the gas supply pipe limits the replenishment effect, impacting cleaning efficiency.

2.1.3 Insufficient Settling Space

The internal settling space of the dust collector is only 380 mm, making effective settling difficult and leading to increased bag load and resistance.

2.1.4 Bag Caking

Low inlet temperatures and high sulfur content can raise the dew point temperature of flue gas, resulting in bag caking.

3. Need for Performance Expansion

Due to production demands, the dust collector urgently requires performance expansion, targeting a processing air volume of 350,000 m³/h.

4. Corrective Measures

In response to the above issues and based on the site conditions, Darko's technicians will implement the following corrective measures:

4.1 Replace with Pleated Bags

We will use pleated bags to increase the filtration area. We will select 160×6000 pleated bags, each with a filtration area of 5.5 m². This will raise the total filtration area to 7260 m². With a processing volume of 350,000 m³/h, the online cleaning airflow will be 0.8 m/min, and the offline cleaning airflow will be 0.91 m/min.

4.2 Replace with Custom Cage

The new cage will work with pleated bags and will ensure adequate strength and vertical alignment according to industry standards.

4.3 Inspect and Correct the Flower Plate

We will check the flatness, hole dimensions, and surface roughness of the flower plate to prevent leaks during bag and cage installation.

4.4 Improve the Pulse Jet System

We will redesign and replace the blowing pipes, installing quick-disconnect devices. We will increase the air supply pipe diameter to 89 mm and check for leaks.

4.5 Increase Settling Space

By using pleated bags, which are 6 meters long, we will increase the internal settling space to nearly 1 meter, significantly enhancing settling efficiency.

5. Quality Assurance and After-Sales Service

5.1 Quality Assurance

After the renovation, we guarantee that when the inlet air volume is <350,000 m³/h, dust concentration is <50 g/m³, and the dew point temperature is <15℃, the dust collector's operating resistance will be ≤1200 Pa, and it will operate for ≥30,000 hours, with an outlet dust concentration ≤30 mg/m³.

5.2 After-Sales Service

Our service personnel will arrive on-site within 48 hours of notification (limited to mainland China).
During the warranty period, we will provide free guidance for installation and commissioning.
We will offer discounts on spare parts.

6. On-Site Operation Precautions

6.1 Operating Temperature

High flue gas temperatures accelerate chemical reactions, damaging filter materials and reducing their lifespan.
The operating temperature must remain above 15℃ to avoid concentrated water vapor forming corrosive acid dew.
Sparks in the flue gas can damage filter bags, so preventive measures are essential.

6.2 Bag Installation Precautions

Before installation, keep the site clean and orderly, removing impurities and ensuring a smooth process.
Install spark arresters before flue gas enters the dust collector to eliminate spark risks.
Ensure good sealing of the dust collector to prevent localized cooling and condensation.
After bag installation, use lime powder or talc for pre-coating to extend the lifespan of the filter materials.

Conclusión

Through the in-depth analysis of the operational issues of the boiler bag dust collector and the implementation of corrective measures, we aim to significantly enhance the equipment's performance and stability. This will not only meet production needs but also reduce environmental impact, ensuring sustainable development for the enterprise. We will continue to monitor the equipment's operational status, conducting regular inspections and maintenance to ensure compliance with environmental standards and support green production.

For further information or to discuss how we can assist you, please Contacto. We look forward to collaborating with you to achieve effective solutions for your dust collection needs.

MÁS

How to Effectively Handle Workshop Dust？

12/13

2024

12/13/2024

In factories, workshops generate a significant amount of harmful dust and gases during production. Properly managing this dust is crucial, and choosing the right method is key. Inhaling dust can lead to lung diseases, while direct emissions can harm the surrounding environment. This article will explore several effective methods for dust management, with a focus on the advantages of colectores de polvo de bolsas pulsantes.

1. Source Control

Optimize Processes

Use low-dust raw materials and techniques to reduce dust generation at the source. This approach not only simplifies later treatment but also enhances overall safety in the production environment.

Improve Ventilation

Increase ventilation systems to promote air circulation within the workshop. This helps lower dust concentration and improves air quality, creating a healthier workplace for employees.

2. Personal Protection

Provide Protective Gear

Equip workers with dust masks, goggles, and gloves. These protective tools safeguard their respiratory systems and skin from dust-related harm.

3. Professional Equipment

Exhaust Fans

Exhaust fans cannot completely eliminate dust, but they can facilitate air movement and ease the dust burden.

Wet Dust Collection

Using mist or chemical solutions can increase the size and weight of dust particles, causing them to settle. This method works particularly well for larger dust particles.

Air Purifiers

Pulse bag dust collectors serve as highly effective professional equipment. They use bags as filter elements to capture fine dust particles, achieving over 99% dust removal efficiency. These devices operate reliably in complex workshop environments and feature automatic cleaning functions, which regularly remove dust from the filters, reducing maintenance costs.

4. Advantages of Pulse Bag Dust Collectors

High Efficiency: They ensure clean air in the workshop, enhancing environmental quality.
Stable Operation: Their well-designed structure adapts to various working conditions.
Fácil mantenimiento: They are simple to operate and maintain, lowering overall costs.

5. Usage and Maintenance Recommendations

Regular Inspections: Check all components of the dust collector regularly to ensure stable operation.
Set Parameters Wisely: Adjust cleaning cycles and intensities based on dust characteristics and working conditions for optimal performance.
Timely Filter Replacement: Regularly inspect filter bags for damage and replace them promptly if needed.

6. Overview of Common Dust Collection Equipment

When dealing with dust, consider the following types of dust collection equipment:

Cyclone Dust Collectors: These are suitable for larger, heavier dust particles. They require low initial investment, are easy to manage, and allow for convenient dust collection.
Wet Dust Collectors: These are effective for various dust types and offer high capture efficiency. While they have low investment costs and operational expenses, the collected dust has a high moisture content. If reused, it needs to be dehydrated; otherwise, it can cause secondary pollution.
Bag Dust Collectors: They offer high purification efficiency, low energy consumption, and no secondary pollution. They work well for fine dust, achieving over 95% efficiency, and are easy to maintain. However, they should not handle moist or oily dust, and temperatures must remain within the bag's tolerance.
Cartridge Dust Collectors: These have high purification efficiency, low energy use, and are effective for dust collection, especially fine particles, achieving over 97% efficiency. They are stable, allow for easy material recovery, and require simple maintenance.

Conclusión

In summary, effective workshop dust management requires a comprehensive approach. Pulse bag dust collectors stand out as an efficient, stable, and easy-to-maintain solution. If you have further questions or needs regarding dust management, feel free to Contacto!

MÁS

CONACTO

1.Environmental Requirements

2.Crusher and Discharge Chute

3.Vibrating Screen Parameters

4.Equipment Layout

5.Air Velocity Design

6.Filtering Velocity Selection

7.Equipment Dimensions

Importance of Filtering Velocity

Design and Performance Features

Conclusión

Identified Problems

Rectification Measures

1) Redesigning the Discharge Device

2) Improving Sealing Performance

3) Regular Maintenance and Inspection

Post-Modification Results

1. Internal Air Leakage in Preheater Systems

1.1 Damper Open State

1.2 Pressure Rod Suspended

1.3 Worn or Unlubricated Bearings

1.4 Dust in Bearings

1.5 Worn or Detached Damper Plates

1.6 Separation of Shaft and Damper Plate

1.7 Risks of Internal Air Leakage

2. External Air Leakage

2.1 Air Leakage at the Kiln Head

2.2 Air Leakage at the Kiln Head Seal

2.3 Deformation of the Kiln Mouth

2.4 Poorly Sealed Inspection Holes

2.5 Leakage at the Bottom of the Humidification Tower

3. Analysis of Leakage Causes

4. Consequences of External Air Leakage

4.1 Increased Heat Loss

4.2 Higher Electrical Consumption

4.3 Lower Temperatures

4.4 Reduced Air Temperature and Volume

4.5 Clogging in Preheater Systems

Conclusión

1. Dust Hood Design

2. Choosing the Right Type of Dust Hood

External Dust Hoods

Enclosed Dust Hoods

Capture Dust Hoods

3. Considerations for Dust Hood Design

1. Preparación

2. Install the Foundation

3. Install the Ash Hopper

4. Install the Filter Bag Chamber

5. Install the Pulse Cleaning System

6. Install Inlet and Outlet

7. Install Electrical System

8. Debugging and Testing

9. Maintenance and Care

1. Natural Cooling

2. Indirect Cooling

3. Spray Direct Cooling

4. Mixing Cool Air for Direct Cooling

5. Cold Air Valve

6. Waste Heat Recovery

On/Off Electric Butterfly Valves

Definition and Function

Escenarios de aplicación

Regulating Electric Butterfly Valves

Definition and Function

Escenarios de aplicación

Principales diferencias

Control Methods

Applicability

Selection Considerations

Conclusión

Design and Specifications

Principio de funcionamiento

Características principales

Usage Notes

Maintenance and Testing Notes

Application and Limitations

I. Overview of Construction Methods

II. Main Characteristics of Construction

III. Structural and Surface Requirements for the Protected Metal Shell