Three points to consider when choosing a dust removal device

There are many factors when choosing a dust removal equipment, which can be classified into three categories: environment, engineering, and economy.

1 ) Environmental factors include the location of dust removal equipment , available space, ambient conditions, large allowable emission concentrations, possible waste water and solid waste, etc.
2 ) Engineering factors include the characteristics of dust-laden gas, smoke characteristics and dust removal performance and design.
3 ) Economic factors include basic investment (equipment, installation, engineering, etc.) operating costs (electricity and maintenance), equipment life and depreciation.

Second, the general steps when choosing
1 ) Conduct an engineering survey that includes the characteristics of particulate contaminants and dust-containing gases, production equipment, operating and operating conditions, and comprehensive utilization (including the recovery of captured particulates, waste heat utilization, and waste disposal, etc.).

2 ) Calculate the required purification rate based on initial dust concentration and emission standards.

3 ) Perform technical and economical analysis on the possible dust removal equipment and select suitable purification equipment.

4 ) Determine the model specifications and operating technical parameters of the precipitator according to the data of the engineering adjustment investigation.

Third, select points

1 ) Dust concentration When dust collectors are selected, they generally pay more attention to the particle size distribution of smoke, and often ignore the influence of smoke concentration. The greater the concentration of imported dust of mechanical dust removal equipment, the higher the dust removal efficiency, but the concentration of export dust will also increase; in the Venturi dust removal equipment scrubber, the initial dust content is taken into account in the factors such as friction loss and nozzle clogging of the throat section. concentration of 10 g / m or less; dust removal equipment in the cartridge, the lower the initial concentration of dust, the better the overall performance of the dust, when the initial high concentration of dust, a small change in pressure loss using continuous cleaning mode; Electrostatic precipitators are generally used in areas where the initial dust concentration is less than 30 g / m3.

2 ) Temperature and Humidity of Dust-Containing Gas Dry dust collectors must, in principle, operate at a temperature above the dew point of the dust-laden gas due to the presence of dust dew points on the dry scrubbers . . The dew point of dusty gas is generally around 323K . Due to the presence of sulfur trioxide, the dew point sometimes rises back to 433K , which causes a series of problems of corrosion and heat loss. In order to prevent the corrosion of low-temperature metal surfaces, the temperature of the dust-laden gas must be higher than the dew point of the acid-containing vapor, so that the heat loss will increase. For this reason, the company has measures to prevent the further oxidation of sulfur dioxide.

In bag type dust collectors, the temperature of the dust-laden gas should be below the heat-resistant temperature of the filter bag . Electrostatic precipitator = equipment using temperature up to 673K , but to consider the specific resistance of dust with temperature changes, generally between 373-473K , specific resistance.

3 ) The use of wet dedusting equipment should be considered. Although the wet dedusting device has high dedusting efficiency and good economic performance, the long-term operation reliability of the device can be poor. We should consider carefully according to the characteristics of the area and the type of boiler. Acidic wastewater is commonly used in wet dust collectors to corrode equipment and fouling under acidic conditions . Wet dust removal equipment should not be used when the acid content in the dust exceeds 10% .

 

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