The occasions where explosive gasses are generated in the dust removal project include blast furnace gas contained in the steelmaking plant containing coal gas; high concentrations of coal powder contained in the exhaust gas such as coal crushing, milling and pulverized coal transport; explosive gases generated from incinerator burning waste; woodworking factory woodworking Mechanically produced wood flour and the like are all explosive. Tags: coal dust explosion-proof electrostatic bag dust collector side spray pulse bag dust collector in the dust removal project in the occasion of explosive gas: steel mill blast furnace gas containing coal; coal crushing, milling and pulverized coal transport and other exhaust gas contains high concentrations Pulverized coal; Explosive gases from the burning of waste in incinerators; Wood flour from woodworking plants can be explosive. Therefore, when we choose the dust collector, we must carry out the necessary explosion-proof design of the dust collector. Here we introduce the explosion-proof measures of the coal dust explosion-proof bag dust collector.
(1) Explosion-proof structural design measures for pulverized coal explosion-proof bag dust collectors The special design of the dust collector body structure is to prevent the accumulation of dust from combustible dust inside the dust collector. All beams, partition plates, etc. shall be provided with dust prevention plates. The slope of the dust board should be less than 70 degrees. The slip angle of the hopper is greater than 70 degrees. To prevent ash from being formed due to the small angle between the two bucket walls, the two adjacent side plates shall be welded with slide plates to eliminate the deposition of dust, taking into account the abnormal operation of the explosion-proof dust collector. When the humidity of the dust is high, there is a ash bucket dew condensation, and when the ash bucket is designed, steam tube insulation or a tubular electric heater is added to the high-temperature dust collector on the ash wall. In order to prevent the ash hopper of the dust collector, each ash bucket must also be provided with arm shakers or air cannons.
A dust collector is at least 2 to 3 ash hoppers, and as many as 5 to 8 explosion-proof dust collectors will produce deflections caused by uneven air flow during use. The amount of pulverized coal in each ash hopper is uneven, and the final ash large.
In order to solve the problem of non-uniform air flow in the explosion-proof bag filter, the following measures can be taken in the structure: (1) Wind deflector is added to the inclined partition plate of the dust collector. The size of the baffle should be determined according to the principle of equal wind volume and equivalent wind pressure; 2 and then taking into account changes in the actual situation at the scene, adjustable between the lift valve stem and the valve plate, so that the export high h is the change value to further correct ; 3 In the air intake branch air flow control valve, dust removal equipment to adjust the amount of air flow in each box. The difference between the air volume of each chamber of the dust collector is controlled within 5%.
(2) Explosion-proof bag type dust collector should use anti-static filter bag inside the dust collector. Because the high concentration of dust rubs against each other in the flowing process, the dust and the filter cloth also have mutual friction and can generate static electricity. The accumulation of static electricity will generate sparks. Causes burning. For the pulse cleaning method, polyester filter needles are used for dust filter bags. In order to eliminate the static defects of polyester needle punch felt, conductive metal wires or carbon fibers are spun into the filter bag fabrics. When the dust filter bags are installed, the filter bags are used. Through the steel skeleton and the porous plate connected through the shell into the workshop grounding net. For counter dust cleaning filter bags, MP922 and other anti-static dust bags have been developed. In the pulverized coal explosion-proof bag filter, wood explosion-proof bag filter, smelting explosion-proof bag filter used in the effect is very good.
(3) Explosion-proof bag dust collectors should be provided with safety holes (valves). It is important to set the safety holes and essential fire-fighting equipment to limit the explosion to the inside of the bag filter without extending it to other areas. The purpose of setting up safety holes is not to prevent the safety holes from exploding, but to use it to limit the scope of explosion and reduce the number of explosions. Most dust collectors that deal with explosive dust are operated with safety holes. Because of this, the design of the safety hole should ensure that if an explosion accident occurs, it can effectively play a role; in the meantime, it is necessary to strengthen the maintenance and management of the safety hole.
(1) Explosion-proof structural design measures for pulverized coal explosion-proof bag dust collectors The special design of the dust collector body structure is to prevent the accumulation of dust from combustible dust inside the dust collector. All beams, partition plates, etc. shall be provided with dust prevention plates. The slope of the dust board should be less than 70 degrees. The slip angle of the hopper is greater than 70 degrees. To prevent ash from being formed due to the small angle between the two bucket walls, the two adjacent side plates shall be welded with slide plates to eliminate the deposition of dust, taking into account the abnormal operation of the explosion-proof dust collector. When the humidity of the dust is high, there is a ash bucket dew condensation, and when the ash bucket is designed, steam tube insulation or a tubular electric heater is added to the high-temperature dust collector on the ash wall. In order to prevent the ash hopper of the dust collector, each ash bucket must also be provided with arm shakers or air cannons.
A dust collector is at least 2 to 3 ash hoppers, and as many as 5 to 8 explosion-proof dust collectors will produce deflections caused by uneven air flow during use. The amount of pulverized coal in each ash hopper is uneven, and the final ash large.
In order to solve the problem of non-uniform air flow in the explosion-proof bag filter, the following measures can be taken in the structure: (1) Wind deflector is added to the inclined partition plate of the dust collector. The size of the baffle should be determined according to the principle of equal wind volume and equivalent wind pressure; 2 and then taking into account changes in the actual situation at the scene, adjustable between the lift valve stem and the valve plate, so that the export high h is the change value to further correct ; 3 In the air intake branch air flow control valve, dust removal equipment to adjust the amount of air flow in each box. The difference between the air volume of each chamber of the dust collector is controlled within 5%.
(2) Explosion-proof bag type dust collector should use anti-static filter bag inside the dust collector. Because the high concentration of dust rubs against each other in the flowing process, the dust and the filter cloth also have mutual friction and can generate static electricity. The accumulation of static electricity will generate sparks. Causes burning. For the pulse cleaning method, polyester filter needles are used for dust filter bags. In order to eliminate the static defects of polyester needle punch felt, conductive metal wires or carbon fibers are spun into the filter bag fabrics. When the dust filter bags are installed, the filter bags are used. Through the steel skeleton and the porous plate connected through the shell into the workshop grounding net. For counter dust cleaning filter bags, MP922 and other anti-static dust bags have been developed. In the pulverized coal explosion-proof bag filter, wood explosion-proof bag filter, smelting explosion-proof bag filter used in the effect is very good.
(3) Explosion-proof bag dust collectors should be provided with safety holes (valves). It is important to set the safety holes and essential fire-fighting equipment to limit the explosion to the inside of the bag filter without extending it to other areas. The purpose of setting up safety holes is not to prevent the safety holes from exploding, but to use it to limit the scope of explosion and reduce the number of explosions. Most dust collectors that deal with explosive dust are operated with safety holes. Because of this, the design of the safety hole should ensure that if an explosion accident occurs, it can effectively play a role; in the meantime, it is necessary to strengthen the maintenance and management of the safety hole.
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