Dry dust collector
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Dry dust collector

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Dry dust collector

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The body structure is mainly composed of the upper box, the middle box, the lower box (ash bucket), the ash cleaning system and the exhaust mechanism. According to the shape of the filter bag is divided into flat bag (trapezoidal and flat) and round bag (cylindrical). According to the air inlet and outlet mode, it can be divided into downward air inlet and upward air outlet and upward air outlet and straight flow (only limited to flat plate bag). According to the bag filtration mode is divided into external filter type and internal filter type. Filter material with fiber, cotton fiber, wool fiber, synthetic fiber and glass fiber, different fibers woven into the filter material has different properties. Commonly used filter material 208 or 901 polyester wheel flanged cloth, the use of temperature generally does not exceed 120℃, after silicone resin treatment of glass fiber filter bag, the use of temperature generally does not exceed 250℃, cotton wool fabric is generally suitable for no corrosion; The temperature is below 80-90℃ dusty gas.

Dry dust removal device, such as bag dust collector on the top of the warehouse, is a dust removal device that collects solid particles in dusty gas by using bag filter element made of fiber braid. Its principle is that dust and dust are intercepted when passing through the filter cloth fiber due to inertia and contact with the fiber. Dust collected on the filter bag is periodically removed by the dust removal device and falls into the ash hopper, and then discharged through the ash discharge system. The dust-containing air enters the dust box from the bottom of the dust collector, the dust with coarse particles settles down by its own gravity and falls into the ash bin, and the fine dust is absorbed into the dust of the filter bag through various effects. With the growth of time, the accumulation becomes thicker, the resistance of the dust collector gradually rises, and the amount of gas treated is constantly reduced. In order to keep the dust collector in an effective working state, To keep the pressure loss within a certain range, it is necessary to remove the ash adsorbed on the outside of the bag wall.

Initial dust: a dry dust filter device, filter material used for a period of time, due to screening, collision, retention, diffusion, electrostatic and other effects, the surface of the bag accumulated a layer of dust, this layer of dust is called the initial layer, in the process of movement after this, the initial layer became the main filter layer of the filter material, relying on the role of the initial layer, the filter material with larger mesh can also obtain higher filtration efficiency.

Efficiency: With the accumulation of dust on the surface of the filter material, the efficiency and resistance of the dust collector are increased accordingly. When the pressure difference between the two sides of the filter material is very large, some of the fine dust particles attached to the filter material will be squeezed in the past, so that the efficiency of the dust collector will be reduced. In addition, the high resistance of the dust collector will make the air volume of the dust removal system decrease significantly.

Dust removal: Therefore, dust removal should be timely after the resistance of dust collector reaches a certain value. The initial layer cannot be destroyed when cleaning, so as not to reduce the efficiency. With the powder repeatedly attached to the outer surface of the bag, the powder layer continues to thicken, and the resistance value of the bag dust collector also increases. The pulse valve diaphragm gives instructions. When the pulse valve is opened, the compressed air in the high pressure air bag is passed. If there is no dust or it is small to a certain degree, the mechanical cleaning work will stop working.

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