Bag dust collector adopts pulse blowing cleaning technology, with low emission concentration, low energy consumption, small footprint, stable operation and good economic benefits. It is suitable for flue gas dedusting in metallurgy, building materials, machinery, chemical industry, electric power, light industry. The box adopts airtight design with good sealing; the working principle of bag dust collector is that the dusty gas flow enters into the cylindrical filter bag from the lower aperture plate, and when it passes through the aperture of the filter media, the dust is arrested and collected on the filter media, and the clean gas which is permeable to the filter media is discharged by the discharge outlet. The dust deposited on the filter media can be dislodged from the surface of the filter media under the effect of mechanical vibration and fall into the dust hopper. In the bag dust collector filter bag, the pore space of the filter media fibre is much larger than the particle size of the dust, so in the early stage of filtration, the main use of fibre dust filtration mechanism, such as inertia, interception, diffusion and electrostatic effect. When the filter cloth gradually formed a layer of dust adhesion layer, collision, diffusion and other roles become very small, and mainly rely on the sieving effect. The dust on the filter bag of the baghouse dust collector will be shaken off and oscillated by the air impact when it is subjected to pulse dust removal. Pulse cleaning can quickly and effectively remove the dust on the filter bag and improve the dust removal efficiency.

In many large-scale industrial production, dust removal is a relatively important part of the work, in order to prevent the production of dust dispersion and flow, a lot of large-scale machinery will be configured with dust outlet and some corresponding dust bag, so that the production environment is clean and stable. Dust is an important factor causing explosions and various accidents, for the production environment and the operation of machinery will cause a very negative impact, so the sealing structure is strong as well as has good operating properties of the dust bag system is a very important auxiliary equipment. In the current industrial production, most of the bag dust collector is through the air inlet, treatment box and matching round or flat bag composition.

The filter cloth used in baghouse dust collector is made of 3 major types of fibre, synthetic fibre and inorganic fibre. Filter cloth according to the processing method is divided into woven cloth, non-woven cloth and composite cloth three kinds, dust removal project within the commonly used polyester flannel, needle felt, filter cloth and glass fibre filter cloth and these cloth after coating the filter cloth and so on. The main technical parameters of the dust collector are air volume, gas temperature, dust concentration and humidity. According to the process design of the air volume, gas temperature, dust concentration value is high, according to slightly less than the value of the technical performance table as a principle, the relative dust collector model, that is, the required dust collector model, the use of filter media according to the inlet concentration, gas temperature, moisture content to determine. Compressed air consumption column, the proposed air consumption for the model of equipment with large air consumption.

Baghouse dust collector working temperature is high, the processing air volume is small, the equipment is simple, easier to avoid flue gas cooling condensation. Determine the appropriate working temperature of the flue gas dust removal, to maintain good filtration conditions and extend the life of the filter bag is very important. The strength of various filter cloths varies with temperature, humidity, operating time and other factors. High temperature flue gas purification, should be based on the heat resistance of the filter cloth, flue gas composition, etc. to select the appropriate filter cloth. Normal room temperature dusty air dedusting, only humidity is a problem, but also just to prevent bright water into the dust removal system, often relatively simple. For high temperature dust removal of flue gas, it is necessary to control the excessive temperature of the flue gas in order to prevent the burning of the filter cloth, but also to control the excessive low temperature to prevent the flue gas condensation corrosion. In the dusty smoke bag house dust collector purification process, as long as the temperature resistance of the filter cloth conditions allow, should make the flue gas temperature as high as possible, so that the dust collector to keep the internal dry, clearing the ash normally, so as to create good operating conditions. Therefore, the development of heat-resistant filter media is important, and the current glass fibre filter media has this benefit. The bag house will control the operating temperature within the permissible range of the filter cloth, because too low a temperature may lead to condensation, too high will cause premature aging of the filter cloth, in addition to avoiding a sharp increase in temperature transient situation. Environmental protection industry has regulations, boiler exhaust temperature and waste heat boiler recovery of flue gas after the waste heat, flue gas temperature should be controlled below 250 ℃. The design of the flue gas temperature to appear inside the dust collector dew point shall prevail. The temperature of high temperature gas filtration process is 200-250℃.

Bag house dust collector mainly in mining, cement, metallurgy, steel, grain, machinery and other industries widely used in the power industry thermal power plant in the single bag type dust collector in the coal conveyor system dust removal, pneumatic dust removal dust removal. Bag type dust collector in the tail of the power station boiler dust removal is not substantial and widely used. However, with the bag type dust collector filter media and other accessories production technology is increasingly improved, the original bag type dust collector in the coal-fired boiler flue gas dust removal in the use of factors, are gradually resolved, bag type dust collector to promote the application of the time is becoming mature. For the current use of the two types of dust removal equipment are electrostatic precipitator and bag house dust collector.

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