Pulse jet bag filter

What’s a Pulse jet bag filter?

The pulse jet bag filter, also known as the pulse jet baghouse or pulse air jet bag filter, is a self-cleaning dry filtration system. The principle of this air jet filter is to use a brief, pulsed blast of compressed air to clean the bags or filters. Dust accumulates on the outer surface of the filter, forming a dust cake.

A pulse jet bag filter mainly consists of the followings:

an upper casing (clean air chamber)
a middle casing (dust chamber)
a hopper
a pulse cleaning system
filter bags
filter bag frames(cages)
inlet and outlet ports
a differential pressure gauge
a inspection door
a dust discharge device
a PLC control system

Function of main components

The internal air is driven by the fan’s power. A negative pressure environment forms inside the whole pulse jet bag filter. The ash air from the inlet enters the pulse jet bag filter under the pressure difference. The airflow passes through the dust filter bags, and the dust is trapped on the surface of the bags. The PLC control system sends pulse signals to the pulse valve. The high-pressure air from the compressor blows off dust from the filter bags. It collects the dust in the hopper, achieving dust recovery. And the clean air goes out from the outlet through the dust collector fan.

Tube sheet

The tube sheet in a pulse jet baghouse fixes and seals the filter bags. The holes on the same tube sheet should have uniform sizes. This will prevent dust leakage from loose or unsprung filter bag rings.The size of the baghouse tube sheet depends on the blowing capacity of the pulse valve.The tube sheet must support the weight of the filter bags and cages. The tube sheet in a baghouse dust collector is usually 4-6 mm thick. This depends on the number of dust filter bags in the chamber.To enhance the rigidity of the tube sheet, reinforcing ribs should be added. Use punching or plasma cutting on the tube sheet holes. Gas cutting is not allowed. The tube sheet, after fabrication, must be smooth and flat. Its flatness deviation must not exceed 2/1000 of its length.

Blow pipes

The blow pipes in pulse jet bag filters are all seamless. And they are straightened using a straightening machine.The blow short pipes (the nozzles) use tooling molds and carbon dioxide shielding during welding. This minimizes deformation and ensures dimensional tolerances between the blowing short pipes. A blowing port is on the underside of the blowing pipe. It faces the center of the filter bag. Each blowing pipe is equipped with a pulse valve connected to the compressed air distributor.The blowing pipe is fixed to the upper casing with a bracket. It has locating pins for accurate repositioning after each disassembly and reassembly.

Filter bags

The filter bag is the heart of a pulse jet bag filter, playing a key role in filtering dust. Dusty air passes through the filter bags. The bag traps the dust. An induced draft fan draws away the clean air. As dust accumulates on the surface of the bag, the resistance of the filter increases. Now, the pulse control system gets a signal. It blows back the bag, causing the dust to fall into the hopper. The discharge device then removes the dust from the filter. The efficiency of dust removal depends entirely on the filter bag.

Special features of a pulse jet bag filter

Pulse jet bag filters are very efficient.

The dust collection efficiency remains stable.

A pulse jet bag filter has a compartmentalized design.

A pulse jet bag filterhas a small footprint.

pulse jet bag filters are highly adaptable of capturing a wide range of dust types.

Specification

Product Series	PPC-32	PPC-64	PPC-96	PPC-128
chamber /pcs	2-6	4-8	4-20	6-28
filter bags of each chamber /bar	32	64	96	128
Size of filter bags/mm	Φ130*2448	Φ130*2440	Φ130*2448	Φ130*23060
Filter area of each chamber /m2	31	62	93	155
Inlet dust concentration/ (g/m3)	≤200	≤200	≤200	≤200
Outlet dust concentration/(m g/m3)	<10	<10	<10	<10
Operating Pressure/pa	-500+2500	-500+2500	-500—2500	-500-2500
resistance/pa	1470-1770	1470-1770	1470-1770	1470-1770
Height/mm	2063	2063	2063	2063
Sizr of pulse valve(“)	2.5	2.5	2.5	2.5
pulse valve of each chamber /pcs	1	1	1-2	2
Air pressure for ash removal/mpa	0.5-0.7	0.5-0.7	0.5-0.7	0.5-0.7