Industrial pulse bag filter

　　Baghouse
 

　　Working principle
 

　　The high dust removal efficiency of the bag filter is inseparable from its dust removal mechanism. When the dust-laden gas enters the ash hopper from the lower part of the dust collector and enters the ash hopper through the deflector. Due to the collision of the deflector and the reduction of gas velocity, the coarse dust will fall into the ash hopper, and the remaining fine particles will follow. The gas enters the filter bag chamber. Due to the inertia, diffusion, barrier, hooking, static electricity and other effects of the filter material fiber and fabric, the dust is trapped in the filter bag, and the purified gas escapes out of the bag and is discharged through the exhaust pipe. The dust on the filter bag is removed by gas backwashing, and the removed dust goes down to the ash hopper, and is discharged to the ash conveying device through the double-layer ash discharging device. The dust on the filter bag can also be removed by spraying pulse airflow, so as to achieve the purpose of dust removal. The dust removed is discharged by the dust discharge device. The high dust removal efficiency of the bag filter is also inseparable from the filter material. The performance and quality of the filter material are directly related to the performance and service life of the bag filter. The filter material is the main material for making filter bags, and its performance and quality are the most important to promote the advancement of bag dust removal technology and affect its application range and service life.
 

　　Filter type dust collectors include bag type dust collectors and particle layer dust collectors. The former usually uses filter bags made of organic fiber or inorganic fiber fabric as the filter layer, while the latter uses particles of different particle sizes, such as quartz sand, It is composed of river sand, ceramsite, slag, etc. As the powder repeatedly adheres to the outer surface of the filter bag, the powder layer continues to thicken, and the resistance value of the bag filter also increases: the pulse reads the diaphragm and the pulse valve opens when the left and right liquids are stopped, and the pressure inside the high pressure air bag If the compressed air is open, if there is no dust or it is small enough, the mechanical dust removal work will stop working.
 

　　The gas purification method of the low-pressure pulse bag filter is external filtration, and the dust-containing gas enters the filter room of each unit through the catheter. Because the bottom of the filter bag is designed to have sufficient and reasonable airflow through the vertical distance from the top of the air inlet Proper diversion and natural flow distribution to achieve uniform air distribution in the entire filter room. Particles and dust in the dust-containing gas fall directly into the ash hopper after being separated by natural sedimentation, and the remaining dust enters the middle box with the airflow under the guidance of the diversion system The filter area is adsorbed on the outer surface of the filter bag. The filtered clean gas is discharged through the filter bag through the upper box and the exhaust pipe.
 

　　The filter bag uses compressed air to blow and clean the ash, and the ash removal mechanism is composed of an air bag, a blow pipe and an electromagnetic pulse control valve. The top of each row of filter bag outlets in the filter chamber is equipped with a blowing pipe. The lower side of the blowing pipe is facing the center of the filter bag with a blowing port. Each blowing pipe is equipped with a pulse valve and communicates with the compressed air bag. When cleaning the ash, the solenoid valve opens the pulse valve, and the compressed air is sprayed by the ash cleaning control device (differential pressure or timing, manual control) to turn on the electromagnetic pulse injection according to the set program, and the compressed gas passes through each pulse in a very short time in sequence The nozzle on the blowpipe induces air several times the amount of sprayed air into the filter bag, forming an air wave, causing the filter bag to produce rapid expansion and shock vibration from the bag mouth to the bottom, resulting in a strong dust removal effect and shaking off the filter. Dust on the bag.

　　Product description
 

　　The bag filter is a dry filter device. It is suitable for capturing fine, dry, non-fibrous dust. The filter bag is made of woven filter cloth or non-woven felt, and the dust-containing gas is filtered by the filtering effect of the fiber fabric. When the dust-containing gas enters the bag filter, the dust with large particles and high specific gravity will be affected by gravity. The effect settles down and falls into the ash hopper. When the gas containing finer dust passes through the filter material, the dust is blocked and the gas is purified.
 

　　Bag filter is a dry dust filter device. After the filter material is used for a period of time, due to the effects of filtering, collision, retention, diffusion, static electricity, etc., a layer of dust accumulates on the surface of the filter bag. This layer of dust is called the primary layer. In the subsequent movement process, the primary layer becomes The main filter layer of the filter material depends on the function of the primary layer, and the filter material with larger mesh can also obtain higher filtration efficiency. As dust accumulates on the surface of the filter material, the efficiency and resistance of the dust collector increase accordingly. When the pressure difference between the two sides of the filter material is large, some fine dust particles that have been attached to the filter material will be squeezed. The efficiency of the dust collector is reduced. In addition, excessive resistance of the dust collector will significantly reduce the air volume of the dust removal system. Therefore, after the resistance of the dust collector reaches a certain value, it must be cleaned in time. The primary layer should not be destroyed when cleaning dust, so as not to reduce efficiency.