fume purification integrated system During dust removal, negative pressure is formed in the dust collecting hood through the suction of the fan, and the dust is sucked into the dust collector. There are several dust bags in the middle box of the dust collector. The dust bag is breathable, there is a pressure difference between the filter cloth, and the gas can be passed from the gap to the opposite side. The dust-containing gas flows to the filter cloth and the dust is blocked by the filter cloth, and the momentum is close to 0. The dust is deposited on the surface of the bag, and the gas through the filter cloth is purified and discharged out of the dust collector. In the selection of filter cloth should be based on the nature of dust, temperature, particle size, whether corrosive to determine. The use of submerged pulse valve, opening and closing, small resistance, for 6 meters ~ 8 meters long filter bag, the injection pressure is only 0.15 ~ 0.3MPa, can obtain a good ash cleaning effect. The equipment cost is low. Due to the high filtration load, the required filtration area is smaller than the fume purification integrated system for the same amount of smoke, so the equipment is compact and occupies a small area. The control system based on PLC programmable controller can control the dust removal, flue gas temperature, dust removal pressure and other operating parameters in real time, function and stability. Remove the ash. The acceleration obtained on the surface of the filter bag is much greater than that of other types of fume purification integrated system, and the cleaning is uniform and the effect is good. High filtration load. Because of the dust cleaning, even if the dust collector is running at a better filter wind speed, its resistance is not too high, generally 1200 ~ 1500Pa, compared with the reverse air dust collector, the same filter area, fume purification integrated system has a large amount of processing air.

fume purification integrated system Air leakage solution:

First, optimize the design and installation of fume purification integrated system

fume purification integrated system is large in volume, in order to facilitate transportation, it is usually used to disassemble, separate shipping, on-site assembly and so on. Improper installation on site is easy to cause the dislocation of equipment up and down, and forced installation is easy to produce local deformation and uneven welds; After the equipment is put into operation, under the combined action of fan power, ash cleaning power and thermal stress, the above defects are easy to form a high stress concentration, resulting in local cracking and air leakage of the equipment. In the design of dust collector, in addition to considering that the equipment body has sufficient strength and stiffness, the installation procedure should be optimized to reduce the accumulated error of installation as much as possible and improve the installation quality.

Second, increase the sealing of fume purification integrated system of rotary kiln dust removal system

Increase the manhole door seal: the manhole door cover plate design should meet the strength and stiffness requirements, the door frame and door cover plate must be smooth during production, and the sealing strip is used for sealing during assembly, and the door is pressed tightly with a press block. Common seal structures are "U" type and "Y" type. Add reverse blower valve seal: fume purification integrated system fume purification energy from fume purification integrated system of fume purification system is from fume purification integrated system. In order to protect its motor and avoid frequent opening, fume purification integrated system is generally set to normally open. If the valve of fume purification integrated system is not tightly closed, The positive pressure gas generated during the operation of the reverse blower will continue to blow into the bag room during the non-cleaning period, which seriously interferes with the normal filtration work of the dust collector. The main manifestations are: continuous working resistance caused by air leakage; During the cleaning process, due to the leakage of other multiple reverse blower valves, the energy is dispersed, so that the cleaning energy in the cleaning bag room is insufficient, affecting the cleaning effect. In order to improve the operation efficiency, it is recommended to use a sealing ring to seal the reverse blower valve.

Increase the sealing of the dust removal system: to prevent air leakage, it is also necessary to increase the sealing of rigid impeller feeder, inlet and outlet valves, conveying equipment and pipelines, inspection doors and other equipment to reduce air leakage. For example: to improve the processing accuracy, all the joints of the shell and pipeline must be continuously welded, and there can be no air leakage and de-welding phenomenon; Each valve, ash discharge, ash return equipment connection with sealing gasket, and fastener connection, there can be no air leakage phenomenon.

Thirdly, the pulse injection pressure of fume purification integrated system is correctly selected

The ash cleaning energy of the pulse jet bag dust collector comes from compressed air, and the compressed air injected is a positive pressure gas. Under the premise of the ash cleaning effect, in order to protect the filter bag and operation, the gas pressure should not be too large, and the injection of compressed air at the moment of ash cleaning can also be regarded as air leakage of the equipment. The higher the injection pressure, the higher the operation resistance of the equipment. Recommended value: 0.20MPa to 0.25MPa.

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