Introduction of dust collector selection

Release time:05-10-2019
Abstract:

The work of the dust collector not only directly affect […]

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 sanitation of the workshop area and surrounding residents, the wear and life of the fan blades, and the economic value materials. Recycling issues. Therefore, the dust collector must be properly designed, selected, and used. When selecting a dust collector, it is necessary to fully consider the investment and operating costs, such as dust removal efficiency, pressure loss, reliability, investment, floor space, maintenance management, etc., according to the physical and chemical properties, characteristics and production process requirements of the smoke, targeted Choose a dust collector.
1. According to the requirements of dust removal efficiency
The selected dust collector must meet the emission standards.
Different dust collectors have different dust removal efficiencies. For dedusting systems with unstable or fluctuating operating conditions, attention should be paid to the effect of changes in flue gas treatment on dust removal efficiency. In normal operation, the efficiency of the precipitator is: bag filter, electric precipitator 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, factors such as air volume, temperature, composition, and humidity must be considered. Electrostatic precipitator is suitable for flue gas purification with high air volume and temperature <400 °C; bag filter is suitable for flue gas purification with temperature <260 °C, not limited by the amount of flue gas, when the temperature is ≥260 °C, flue gas Bag type dust collector should be used after cooling and cooling; bag type dust collector should not be used to treat high humidity and oily flue gas purification; flammable and explosive gas purification (such as gas) is suitable for wet type dust collector; cyclone dust collector processing air volume Limited, when the air volume is large, multiple dust collectors can be used in parallel; when it is necessary to simultaneously remove dust and purify harmful gases, a spray tower and a cyclone water film dust collector can be considered.
3. According to the nature of dust
Dust properties include specific resistance, particle size, true density, scorch, water and hydraulic, flammable, explosive, and the like. The electrostatic precipitator should not be used for dust with excessive or excessive resistance. The bag filter is not affected by the dust specific resistance. The concentration and particle size of the dust have a significant effect on the efficiency of the electrostatic precipitator, but the effect on the bag filter. Not obvious; when the dust concentration of the gas is high, the pre-dusting device should be installed before the electrostatic precipitator; the type of the bag filter, the cleaning method and the filtering wind speed depend on the nature of the dust (particle size, scorch); Dust collectors are not suitable for purifying hydrophobic and hydraulic dust: the true density of dust has a significant impact on gravity dust collectors, inertial precipitators and cyclone dust collectors; for newly attached dust, it is easy to cause cats in the working face of dust collectors. Or blockage, therefore, it is not advisable to use dry dust removal; when the dust is cleaned and it can produce a flammable or explosive mixture, the wet dust collector should not be used.
4. According to pressure loss and energy consumption
The resistance of the bag filter is greater than that of the electrostatic precipitator, but compared with the overall energy consumption of the precipitator, the energy consumption of the two is not much different.
5. According to equipment investment and operating expenses
6. Water saving and antifreeze requirements
Wet dust collectors are not suitable for areas where water resources are scarce; winter freezes are problematic in the north, and wet dust collectors are not used as much as possible.
7. Requirements for dust and gas recycling
When the dust has the recovery value, dry dust removal should be adopted; when the dust has high recovery value, the bag type dust collector should be used; when the purified gas needs to be recycled or the purified air needs to be recycled, it should be adopted. High efficiency bag filter.