1. Selection of filtering speed: The filtering speed is the key factor in the selection of pulse bag filter. It should be determined according to the properties of dust or dust, application occasion, particle size, viscosity, gas temperature, moisture content, dust concentration and different filter materials. When the particle size of dust is finer, the temperature and humidity are higher, the concentration is higher, and the viscosity is larger, the low value should be chosen. If < 1m/min, conversely, the high value should not exceed 1.5m/min. For dust with large particle size, normal temperature, dry, non-sticky, and very low concentration, 1.5-2 m/min can be selected. When selecting filtration speed, it should be calculated that the net filtration wind speed should not exceed the above values when reducing the filtration area of one chamber (when cleaning ash).
2. Filtration material: It should be considered according to the temperature, moisture content, acidity, alkalinity, viscosity, concentration and grinding pecking of dust gas. Generally, when the water content is small and there is no acidity, it is chosen according to the temperature of dust gas. At room temperature or < 130 C, 500-550 g/m2 polyester needle-punched felt is commonly used. When < 250 degree C, aramid Nomex needle felt or 800g/m2 glass fiber needle felt or 800g/m2 weft double glass fiber fabric or FMS high temperature filter material (fluorine gas can not be made of glass fiber material). When the moisture content is large and the dust concentration is high, water-proof, oil-proof filter material (or dew-proof filter material) or membrane-covered filter material (the base cloth should be needle-punched felt after waterproof treatment) should be selected. Ryton polyphenylene sulfide (Ryton PPS) needle-punched felt is often used when the dust-containing gas is acidic and alkaline and the gas temperature is less than 190 degrees C. P84 (polyimide) needle-punched felt is selected when the gas temperature is less than 240 degree C and the requirement of acid and alkali resistance is not too high. When the dust-containing gas is flammable and explosive gas, anti-static tapestry is selected. When the dust-containing gas has certain moisture and is flammable and explosive gas, water-proof, oil-proof and anti-static (three-proof) tapestry is selected.
3. Controller: The dust cleaning control of pulse bag filter adopts PLC micro-computer programmable controller, which is divided into three control modes: constant pressure (automatic), timing (automatic) and manual. Fixed pressure control: according to the set pressure difference control, the pressure difference of the dust collector exceeds the set value, and each room automatically cleans the dust one time in turn. Timing control: according to the set time, every other cleaning cycle, each room in turn cleaning once. Manual control: Manual control can be used on the field cabinet to automatically clear the dust in each room in turn, or to separate the dust in each room. The control mode is selected by the user. When the user has no requirement, the supply will be controlled regularly.