The selection of dust remover should consider many kinds of influence factors and conditions. Considering each influence factor and condition, the selection can be made from the following aspects: 1. According to the dispersion and density of dust, the dispersion of dust has a great influence on the performance of dust remover, the dispersion degree of dust is the same, but it is different because of different operating conditions. Therefore, in the selection of dust remover, first of all, it is necessary to accurately grasp the dispersion of dust, such as more than 10 m in the size of the cyclone can be selected; in the size of more than a few microns, it should be selected electrostatic precipitator, bag filter. The concrete selection can be made according to the dispersion and other requirements, referring to the types and performance tables of common dust collectors, and then determined according to other conditions and types and performance introduction of dust collectors. The dust density also has a great influence on the dust removal performance of the dust collector. The effects of gravity, inertia force and Centrifugal Force are obvious. A common feature of all dust collectors is that the smaller the packing density, the more difficult the separation and collection of dust particles, and the more serious the secondary dust emission, so special measures should be taken in operation and equipment structure. 2 according to the type selection of treatment gas volume, the amount of treatment gas volume is the decisive factor of the size and type of the dust remover. For the air volume, we must choose the dust remover which can handle the large air volume, it is not economical to use several dedusters with small gas volume in parallel. For small gas volume, it is necessary to compare which type of deduster is more economical and easier to meet the control of dust source point and the environmental protection requirement of dust emission. It is not easy to predict the operation and environmental conditions of the dust remover when it is in actual operation. Therefore, when determining the capacity of the dust remover, it is necessary to ensure a certain margin or reserve some space which may increase the capacity of the equipment. 3 according to the type selection of gas dust concentration, for the gravity, inertia force and cyclone dust collector, the greater the dust concentration at the inlet, the higher the dust removal efficiency, but this will increase the dust concentration at the outlet, therefore, we can not generally think that the dust treatment effect is good only according to the high dust removal efficiency. For Venturi Tube and Jet Scrubber, the initial dust concentration is below 10g / m, and for bag filter, the lower the dust concentration is, the better the dust removal performance is. When the initial concentration is high, the continuous ash removal, pressure loss and emission concentration can also meet the environmental protection requirements. The initial concentration of electrostatic precipitator is less than 30g / M, no pre-precipitator can also be used. The adhesion mechanism of dust and wall surface is closely related to the specific surface area and moisture content of dust. The smaller the particle size of d, The larger the specific surface area and the more water content, the greater the adhesion. In the cyclone, the dust adhered to the wall surface due to centrifugal force, and there was the risk of blocking, while the dust adhered to the bag filter was easy to block the pore of the bag filter, and the electrostatic precipitator was easy to make the discharge electrode and dust collecting positive. 5 The influence of dust specific resistance on type selection, the dust specific resistance of electrostatic precipitator should be in the range of 104 ~ 10n cm. The specific resistance of the dust varies greatly with the temperature and humidity of the dust-containing gas. For the same kind of dust, the specific resistance is larger between 100 °C and 200 °C. Therefore, it is necessary to know the specific resistance of the dust in advance, and to consider the selection of the temperature and the adjustment of the properties of the dust-containing gas. In principle, the dry dust collector must be carried out at the temperature above the dew point of the dust-containing gas. In wet deduster, due to the evaporation of water and the condensation after discharge into the atmosphere, it should be treated at low temperature. In the cartridge filter, the temperature of directly or indirectly treating the dust-containing gas should be lower than the temperature of the heat-resistant filter cloth. The operating temperature of glass fiber filter cloth is usually below 260 °c. The other filter cloth is between 80 °C and 200 °C. In the ESP, the operating temperature can reach 400 °C. The specific resistance of the dust and the thermal expansion of the structure of the dust collector should be taken into account to select the temperature at which the gas containing dust is treated. 7 choose wet dust collector matters needing attention, wet dust collector is mostly water. If the dust source equipment is small, need to remove harmful gases, or need to be very fine carbon black, lead dust dust and other dust collection, often using wet dust collector. The choice of wet dust collector should consider sewage treatment to prevent secondary pollution. In addition, in order to effectively use the dust collector, should be handled according to the situation. When dealing with the flue gas containing carbon monoxide, there should be measures to prevent explosion, such as introducing air into the high-temperature part of the furnace outlet flue to oxidize carbon monoxide into carbon dioxide. In addition to pre-selecting the dust-removing gas according to the above basic factors, the type of dust-removing gas can also be selected according to the following factors: analyzing the technical and economic indexes of the pre-selected dust-removing devices, comprehensive consideration of equipment costs, operating costs, service life, area and other relevant factors to determine the basis for dust remover. The comprehensive analysis of environmental benefits must be carried out to determine the dust remover. Dust removal effect is good, gas emission concentration is low, to bring benefits to the environment, but also to the production and living benefits, so the choice of equipment can not be ignored. Dust Collector selected according to local conditions, the unit's level of Operation Management, and combined with the above-mentioned selection of dust collector type.