Bag Filter

A bag house, also known as a baghouse filter, bag filter, or fabric filter is an air pollution control device and dust collector that removes particulates or gas released from commercial processes out of the air.

Most baghouses use long, cylindrical bags (or tubes) made of woven or felted fabric as a filter medium. For applications where there is relatively low dust loading and gas temperatures are 250 °F (121 °C) or less, pleated, non woven cartridges are sometimes used as filtering media instead of bags.

The gas purification mode of the off-line dust cleaning low-pressure pulse bag dust collector is external filter type. The dust-containing gas enters the filtration chamber of each unit through the guide pipe and passes through the flue gas guide device in the ash hopper. As the vertical distance between the bottom of the bag and the top of the air inlet in the design is sufficient and reasonable, the airflow is distributed through appropriate diversion and natural flow direction, so as to achieve uniform airflow distribution in the whole filter chamber. The particulate dust in the dust-containing gas falls directly into the ash hopper after separation by natural settlement. The rest dust enters the filtration area of the box with the air flow under the guidance of the diversion system and is adsorbed on the outer surface of the filter bag. The filtered clean gas penetrates through the filter bag through the upper box and is discharged from the exhaust pipe through the off-line butterfly valve.

The filter bag (baghouse) adopts compressed air to spray and clean ash. The deashing mechanism is composed of air bag, spray pipe and electromagnetic pulse control valve, etc. A spray pipe is arranged at the top of the outlet of each row of filter bags in the filtration chamber. The lower side of the spray pipe is directly opposite the center of the filter bag and a spray nozzle is arranged. A pulse valve is arranged on each spray pipe and communicated with the compressed air bag. When cleaning ash, the solenoid valve opens the pulse valve, the compressed air is sprayed to the filter bag through the nozzle, and the surrounding gas is injected into the filter bag together, causing the overall shaking of the filter bag and forming the reverse blowing air flow from the inside out, removing the dust attached to the outer surface of the filter bag, and achieving the purpose of cleaning ash.

As the working condition of filter, when the filter bag surface area reaches a certain amount of dust, controlled by the ash removal device (differential pressure or timing, manual control) open the electromagnetic pulse valve injection by set procedure. The compressed air induces several times the amount of air injected into the filter bag through the nozzles on the blowpipe through each pulse valve in a very short time sequence to form air waves. Making the filter bag from the mouth to the bottom cause the rapid expansion and impact vibration, resulting in a strong dust removal effect, shake off the dust on the filter bag.

The dust in the ash hopper is discharged through the ash discharge valve and output through the ash conveying system.

The dust collector (baghouse) is equipped with advanced off-line butterfly valve, which has the function of online and off-line two-state dust cleaning and off-line maintenance. The resistance is reduced and the airflow is smooth. The dust collector is equipped with on-line monitoring devices such as differential pressure and material level.

The control of dust remover (including dust removal control) is controlled by PLC. The control of the whole dust removal system implements automatic unattended control, and can feed back information to the large system of the factory, and accept the remote control of the large system of the factory.

All maintenance work in the dust collector clean air chamber and outside the machine, do not need to enter the top of the dust collector.