In recent years, prevention and control of air pollution aroused the attention of all walks of life, this article will introduce the use of dust remover introduction and selection of refractory materials industry. Refractory material production, the sealing of the dust equipment is very important, it can greatly reduce the amount of dust in the air, but to be absolutely sealed dust equipment is impossible, especially when the positive pressure inside the sealed enclosure, dust will Escaping from tiny gaps in the enclosure. Therefore, the closed source of dust alone is not enough, but also must continue to suck a certain amount of gas from within the enclosure to keep the enclosure under negative pressure so that dust will not escape from the enclosure. Aspirating dust-laden gas from the enclosure and separating the dust-laden gas into dust and clean gas is called dedusting.
Refractory plant production equipment, such as shredders, screening machines, pressure brick, etc .; usually equipped with a suction hood and suction nozzle, sucked dust through the dust pipe into the various types of dust separation and purification. In the dust equipment set suction hood and suction nozzle, the general should consider the following factors:
1, dust cover try to set the dust point, but to not hinder the operation of the principle;
2, dust cover position to comply with the direction of dust distribution;
3, dust cover shape to meet the working conditions and the occurrence of dust.
For example, the brick pressing machine in the brick forming process (such as scale material, charging, pressure brick and brick) there will be dust generated, therefore, in brick press brick mold set on both sides of 2 to 4 suction nozzle will be greatly Reduce the dust flying brick. Other such as dry-milling machine, screening machine dust collector.
Refractory industry commonly used to several large dust filter selection introduction
1, the use of cyclone dust refractor is a centrifugal force acting precipitator. The principle of dust removal Dust gas in the cyclone for rotary motion, the dust in the centrifugal force and gas separation and discharge from the discharge port.
Cyclone dust collector The main advantages of equipment is simple, cheap, dust removal efficiency (up to 70 ~ 80%). Especially for dust particle size, dust concentration and high dust gas, a good dust removal effect. Therefore, it is widely used in the production of refractory materials. However, the disadvantage of this type of precipitator is that the particle size below 5 microns dust separation effect is not suitable.
2, refractory bag filter is a larger dust removal equipment. In recent years, this kind of dust remover has been used more and more in refractories plants. Its advantage is high dust removal efficiency, up to 95% or more; can handle the dust gas concentration range from a few milligrams / m3 to thousands of milligrams / m3; minimum dust particle size up to 0.1 microns. Therefore, it is the ideal refractory material in the current dust removal equipment. The basic principle of the bag filter is that the dust-laden gas enters the dust collector through the air inlet and leaves the dust on the outer surface of the filter bag through the filter bag. The net air is discharged from the air outlet. Bag filter to work, the outer surface of the filter bag less dust, so the gas through the filter bag is easy. However, as the dust attached to the outer surface of the filter bag increases, the resistance of the gas to pass through the filter bag increases. When it reaches a certain level, the dust removal effect will be affected. Therefore, various methods are required to shake off the dust on the filter bag to ensure normal gas passage. The current use of more is the use of electromagnetic controller or mechanical controller, the compressed air through the venturi to the filter bag for instantaneous (usually 0.1 seconds) injection (called pulse), resulting in intense outward expansion of the filter bag Dust off. Solenoid valve control is usually referred to as electromagnetic pulse; with mechanical controller control called mechanical pulse. Both types of pulse bag filter are used in refractory plants in China.
3, refractory material with air rotary dust collector. The shape of this dust collector looks like a horizontal cylinder. In the cylinder with special guide vane, dust gas from the inlet to tangential direction into the precipitator, revolving around the horizontal axis several times, the role of centrifugal force was separated from the dust to the cylinder wall; in the lower part of the cylinder with water, water and gas movement A film of water is formed on the wall of the drum and the dust is separated and collected. The rest moves with the dust of the gas to the point where it is immersed in the water when the direction of rapid change is below. This cycle several times, to achieve the purpose of dust. This dust collector, used in the dust particle size of more than 5 microns dust gas dust is more efficient; if used in dust-containing gas dust particles less than 1 micron dust removal at the air rotary dust collector entrance, the first spray Particle agglomeration, and then carry out dust removal, can improve dust removal efficiency. The disadvantage of this type of precipitator is that the separated dust has become a slurry of suspension, which makes it difficult to recover the dust. In addition, this type of precipitator can not be used for the separation of hydraulic dust.
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