1. Selection of filtration speed: Filtration speed is the key factor for the selection of dust removal accessories. It should be based on the nature of dust or dust, application, dust particle size, viscosity, gas temperature, moisture content, dust concentration and different filter materials. determine. When the dust particle size is fine, the temperature and humidity are high, the concentration is large, and the viscosity is relatively high. Such as ≤ 1m / min; otherwise, the optional high value, generally should not exceed 1.5m / min. For the dust particle size is large, normal temperature, dry, non-sticky, and the concentration is extremely low, you can choose 1.5 ~ 2m / min. When the filtration speed is selected, it should be calculated that the net filtration wind speed when reducing the filtration area of ​​one chamber (when cleaning) should not exceed the above values.
2. The filter material should be considered according to the temperature, water content, acidity, alkalinity, dust viscosity, concentration and sharpness of the dust-containing gas. Generally, when the water content is small and there is no acidity, it is selected according to the temperature of the dust-containing gas. When the temperature is normal or ≤130 °C, the polyester needle felt of 500-550 g/m2 is commonly used. <250°C, use aramid Nomex needle felt or 800g/m2 glass fiber needle felt or 800g/m2 weft double fiberglass fabric or flumex [FMS] high temperature filter material (fluorine gas can not be used) Glass fiber material). When the water content is large and the dust concentration is large, it is recommended to use waterproof and oil-proof filter material (or anti-condensation filter material) or film filter material (the base cloth should be waterproof felt needle felt). When the dust-containing gas contains acid and alkali and the gas temperature is ≤190 °C, Ryton (polyphenylene sulfide) needle felt is often used. P84 (polyimide) needle felt is used when the gas temperature is ≤240 °C and the acid and alkali resistance is not too high. When the dust-containing gas is a flammable and explosive gas, the anti-static rayon needle felt is used. When the dust-containing gas has both certain moisture and flammable and explosive gas, it is waterproof, oil-proof and anti-static (three-proof). Polyester needle felt.
3. Control instrument, bag filter adopts PLC microcomputer program control instrument, divided into three types of control methods: constant pressure (automatic), timing (automatic) and manual. Constant pressure control: According to the set pressure difference, the pressure difference of the precipitator exceeds the set value, and the chambers are automatically cleaned one by one. Timing control: According to the set time, every other cleaning cycle, each room is cleaned up one by one. Manual control: On the field operation cabinet, you can manually control each room to clean it automatically, or you can clean each room separately. The control mode is selected by the user, and when the user does not request, the supply is controlled according to the timing.
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