Particulate Control – Ammonia FGD Technology Limestone FGD Dry FGD
wide application in particulate control

Particulate Control

The dust removal equipment used in boiler dust collection includes mechanical dust collector, bag dust collector, electric dust collector and wet dust collector. However, each kind of dust removal system has its technical advantages and disadvantages, and it is necessary to select suitable dust removal facilities and processes according to the actual situation. A mechanical precipitator is a device that separates particulate matter from air flow by means of mass forces (gravity, inertia, centrifugal force, etc.). It includes gravity settling chamber, inertial precipitator and cyclone precipitator and so on.
A bag filter is a dust-containing gas entering a cylindrical filter bag from the lower part. When passing through the pores of the filter material, the dust is captured on the filter material, and the clean air through the filter material is discharged from the outlet and deposited on the surface of the filter material. A dedusting and purifying facility that falls off the surface of the filter material under the action of mechanical vibration and finally falls into the ash hopper.
The electrostatic precipitator (ESP) is a kind of dust precipitator which can separate dust from the dust-containing gas in the process of separation by high-voltage electric field, and under the action of electric field force, the dust particles can be gathered on the dust collecting board to separate the dust from the dust-containing gas.
Wet dust collector (WSP) is a kind of dedusting equipment, which makes the dust separate from the dust-containing gas by making use of the inertial collision of the droplet and the particle or the chemical action of the particle to catch the particles in close contact with the dust-containing gas (usually water), so that the dust can be separated from the dust-containing gas.

Wet Desulfurization and Dust Removal Technology

Contact between flue gas and water can cause water to filter dust and other substances in flue gas. Using this principle, wet dust removal technology can collect dust particles better, make the particle size of dust increase, so as to better remove dust from flue gas. In general, besides wet dust removal technology, flue gas desulfurization can also be completed. At present, wet dust removal technology is considered to be the most effective flue gas dust removal technology, with the advantages of safety, reliability and low price. At the same time, the technology can also be applied to a variety of smoke environments, with the characteristics of easy operation and maintenance. However, in the application of this process, the problems of pipeline corrosion and sewage residue should be considered. Therefore, under normal conditions, it is necessary to cooperate with other dust removal technologies to solve the problem of pipeline corrosion and achieve good dust removal effect. Wet desulfurization and dust removal technology generally includes heat supply, drainage, desulfurization, dust removal, dehydration and other emissions. In boiler flue gas desulfurization and dust removal, heating fan is generally required. After heat treatment, flue gas is evenly discharged into the dust removal tube through the swirl plate after the heat of flue gas rises up to the upper dust collector. The corresponding spraying device is installed in the dust collecting cylinder, and a correct amount of liquid dust can be sprayed out, and pollutants in boiler flue gas can be effectively removed by chemical reaction of dust removal liquefaction, sulfide and dust. After heating, drainage, desulfurization and dust removal steps, the boiler flue gas has reached the basic standard and can be discharged. At this time, the corresponding dewatering treatment of flue gas can be discharged.

Electrostatic Precipitation Technology

Two non-uniform electrostatic fields with different curvature radius are formed between metal cathode and metal anode. When the high voltage DC voltage of the electric field is applied to the free field, there will be a discharge phenomenon, forming positive and negative ions. Under the action of the electric field in the opposite direction, the combination of negative ions and neutral ions will form most of the positive and negative ions produced by electron ionization. Secondly, during the irregular movement process, dust particles in the flue gas will collide continuously with each other. The charged dust is forming negative charged dust; the charged dust moves opposite electrodes under the action of electric field, and eventually deposits on the electrodes, resulting in the formation of dust layer; finally, the ordinary differential equations of the two electrodes are set up separately. The utility model relates to a mechanical vibration device, which can be placed on two electrodes to make the dust under the hopper fall off and the dust discharging device discharges the dust.

Mechanical Dust Removal Technology

Dust is the main pollutant in flue gas of coal-fired boilers. With mechanical dust collector, dust can be removed by centrifugal force, mass force, inertia and gravity. According to different pollution conditions, different mechanical dust removal mechanisms can be used to remove dust. At present, cyclone dust collector has been widely used. It can remove dust when the dust load changes. At the same time, we can also use this kind of dust collector to remove corrosive gases in high temperature and high pressure environment. It should be noted that the use of mechanical dust removal technology requires dust particles above 5 meters, so not all smoke and dust environments can adopt dust removal technology.