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Working principle of dust collector
The high dust removal efficiency of the bag filter is inseparable from its dust removal mechanism. Dust-containing gas enters the ash hopper through the deflector at the lower part of the dust collector. Due to the collision of the deflector and the reduction of gas velocity, coarse dust will fall into the ash hopper, and the remaining fine particles will follow the gas. Entering the filter bag room, due to the inertia, diffusion, blocking, hooking, static electricity of the filter fiber and fabric, dust is trapped in the filter bag, and the purified gas escapes out of the bag and is discharged through the exhaust pipe. The ash deposit on the filter bag is removed by gas backwashing method, and the removed dust goes down to the ash hopper and is discharged to the ash conveying device through the double-layer ash discharge valve. The ash deposit on the filter bag can also be removed by blowing pulse air, so as to achieve the purpose of ash removal, and the removed dust is discharged by the ash discharge device. The high 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 of the bag filter and the length of the service life. The filter material is the main material for making filter bags. Its performance and quality promote the advancement of bag dust removal technology and affect its application range and service life.
The filter type dust removal device includes a bag type dust collector and a particle layer dust collector. The former usually uses a filter bag made of organic fiber or inorganic fiber fabric as the filter layer, while the latter filter layer mostly uses particles of different particle sizes, such as quartz sand, River sand, ceramsite, slag and other components. With the powder repeatedly attached 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 valve diaphragm issues a command, the pulse valve opens when flooded from left to right, and the pressure in the high-pressure air bag is compressed. The air is vented. If there is no dust or it is small enough, mechanical dust removal will stop.
The gas purification method of the low-pressure pulse bag type dust collector is an external filter type. Dust-containing gas enters the filter room of each unit through the diversion tube. Because the bottom of the filter bag is designed to have a sufficient vertical distance from the upper opening of the air inlet through a suitable guide, The flow and natural flow direction are distributed to achieve uniform air distribution in the entire filtering room. The particulate dust in the dust-containing gas is directly separated into the ash hopper after being separated by natural sedimentation. The remaining dust is guided by the diversion system and enters the filtering area of the middle box with the airflow. , Adsorbed on the outer surface of the filter bag. The filtered clean gas passes through the filter bag and is discharged through the upper box and the exhaust pipe.
The filter bag uses compressed air to spray and clean the ash. The ash cleaning mechanism consists of an air bag, a spray pipe and an electromagnetic pulse control valve. A spray pipe is arranged on the top of the outlet of each row of filter bags in the filter room. The lower side of the spray pipe is directly opposite the center of the filter bag. A spray valve is provided on each spray pipe and communicates with the compressed air bag. During ash cleaning, 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 open the electromagnetic pulse spray according to the set program. The compressed gas passes through each pulse in a short time and in sequence. The valve induces air that is several times the volume of the injected gas into the filter bag through the nozzle on the blow pipe, forming an air wave, which causes the filter bag to expand sharply and impact vibration from the bag mouth to the bottom, resulting in a strong ash cleaning effect and shaking off the filter. Dust on the bag.
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