Selection basis of dust collector for dust removal and environmental protection equipment
The work of the dust collector not only directly affects the reliable operation of the dust removal system, but also relates to the normal operation of the production system, the environmental hygiene of the workshop and the surrounding residents, the wear and tear of the fan blades, and the life of the fan blades. Recycling issues. Therefore, the dust collector must be properly designed, selected and used. When selecting a dust collector, you must fully consider the one-time investment and operating costs, such as dust removal efficiency, pressure loss, reliability, one investment, floor space, maintenance management, and other factors. According to the physical and chemical properties, characteristics, and production process requirements of the dust, it is targeted. Select the dust collector.
1.According to the requirements of dust removal efficiency
The selected dust collector must meet the requirements of the emission standards.
Different dust collectors have different dust removal efficiency. For dust removal systems with unstable or fluctuating operating conditions, attention should be paid to the effect of flue gas treatment changes on dust removal efficiency. In normal operation, the order of the efficiency of the dust collector is: bag type dust collector, electric dust collector and venturi dust collector, water film cyclone dust collector, cyclone dust collector, inertial dust collector, gravity dust collector
2. According to the nature of the gas
When selecting a dust collector, you must consider factors such as the air volume, temperature, composition, and humidity of the gas. The electrostatic precipitator is suitable for the purification of flue gas with a large air volume and a temperature of <400 ℃; the bag filter is suitable for the purification of flue gas with a temperature of <260 ℃. It is not limited by the amount of flue gas. When the temperature is ≥260 ℃, the flue gas is Bag type dust collectors should be used only after cooling and cooling; bag type dust collectors should not be used to handle high humidity and oily flue gas purification; flammable and explosive gas purification (such as gas) is suitable for wet type dust collectors; cyclone dust collector's air volume Limited. When the air volume is large, multiple dust collectors can be used in parallel. When dust removal and purification of harmful gases are required at the same time, a spray tower and a cyclone water film dust collector can be considered. <p = "">
3. According to the nature of the dust
Dust properties include specific resistance, particle size, true density, scoop, hydrophobicity and hydraulicity, flammability, explosion, etc. Electrostatic precipitator is not suitable for dust with too large or too small specific resistance. Bag type dust collector is not affected by the specific resistance of dust. The concentration and particle size of dust have a significant effect on the efficiency of the electrostatic precipitator, but it has an effect on the bag type dust collector. Not significant; when the dust concentration of the gas is high, a pre-dusting device should be installed in front of the electrostatic precipitator; the type, dust removal method and filtering wind speed of the bag type dust collector depend on the nature of the dust (particle size, scoop); wet type The dust collector is not suitable for purifying hydrophobic and hydraulic dust: the true density of the dust has a significant impact on the gravity dust collector, inertial dust collector and cyclone dust collector; for newly attached dust, it is easy to cause dust on the working surface of the dust collector Or clogging, therefore, it is not appropriate to use dry dust removal; wet dust collectors should not be used when dust purification can encounter flammable or explosive mixtures after encountering water.
4. According to pressure loss and energy consumption
The resistance of the bag type dust collector is greater than that of the electric dust collector, but compared with the overall energy consumption of the dust collector, the energy consumption of the two is not much different.
5. According to equipment investment and operating costs
6. Water saving and antifreeze requirements
Wet dust collectors are not suitable for areas with insufficient water resources; there is a problem of freezing in winter in northern regions, and wet dust collectors are not used as much as possible.
7. Requirements for dust and gas recycling
When dust has recycling value, dry dust removal should be used; when dust has high recycling value, bag dust collector should be used; when purified gas needs to be recycled or purified air needs to be recycled, it should be used Efficient bag filter.