Dust removal technology is an effective measure for the control of smoke (dust), and the equipment that implements this technology becomes a dust remover. Dust catcher mainly mechanical dust collector, wet dust collector, bag filter and electrostatic precipitator.
The choice of dust collector should mainly consider the following factors: flue gas and dust physical and chemical properties; flue gas flow, dust concentration and dust emission concentration allowed; dust pressure loss and dust removal efficiency; dust recovery and utilization of the value and form; Equipment investment and operating costs; dust collector footprint and design life; dust collector operation and maintenance requirements.
According to the production conditions, the type of precipitator, the recovery value of dust, the characteristics of dust and the maintenance and management, the dust collected or discharged shall be properly recovered and disposed according to the relevant standards of the country, industry and place .
(1) Mechanical dust collector
Mechanical dust collector, including gravity settling chamber, inertial dust collector and cyclone and so on. Mechanical dust collector is used to deal with the density of larger, coarse particles of dust, multi-stage dust removal process as a high-efficiency dust pre-dust collector. Gravity settling chamber is suitable for trapping dust particles with a particle size of more than 50μm. The inertial dust collector is suitable for trapping dust particles with a particle size of 10μm or more. The cyclone dust collector is suitable for trapping dust particles with a particle size of 5μm or more.
(2) wet dust collector
Wet scrubbers include sprinkler towers, packed towers, sieve tray towers (again foam scrubbers), wet-film dampers, self-excited wet scrubbers and venturi precipitators.
(3) bag filter
Bag filter, including mechanical vibration bag filter, counter-flow anti-blowing bag filter and pulse jet bag filter. Bag filter dust collector with high efficiency, to meet the stringent emission standards and its characteristics, are widely used in metallurgy, casting, building materials, electricity and other industries. Mainly used to deal with large air volume, a wide range of concentrations and volatile dust gas. When the dust has a high recovery value or smoke emission standards are stringent, the preferred bag filter, incinerator dust collector bag filter should be used. Common bag filter process shown in Figure 1.
Figure 1 common bag filter process
(4) electrostatic precipitator
Electrostatic precipitators include plate electrostatic precipitators and tubular electrostatic precipitators. Electrostatic precipitator is a high-efficiency dust removal equipment, used to handle high-temperature high-temperature flue gas, suitable for capturing dust resistivity in the range of 1 * 104 -5 * 1010 Ω * cm. China's electrostatic precipitator technology level to catch up with the international advanced level over the same period, has been widely used in thermal power plants, building materials cement plants, steel mills, non-ferrous smelters, chemical plants, light paper mills, electronics and machinery industry and other industrial sectors Various kilns. Among them, the thermal power plant is the largest user of ESP in China.
(5) electric bag composite dust collector
Electric bag composite dust collector is installed in a box electric field and bag area, the combination of electrostatic precipitator and filter dust two mechanisms of a dust collector. Electrostatic Bag Filter is suitable for high specific resistance, special coal dust and other dust purification which is difficult to be collected efficiently by electric dust collection. It is suitable for removing dust particles with the size of 0.1μm or more, and also has strict requirements on operation stability and dust emission concentration Gas purification.
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