Technical principles of classic dust removal and environmental protection equipment
The working principle of electrostatic precipitator : When the gas containing dust particles passes through the high-voltage electric field formed between the cathode line (also known as the corona electrode) connected to the high-voltage DC power supply and the grounded anode plate, a corona discharge occurs in the cathode. The gas is ionized. At this time, the negatively charged gas ions move under the action of the electric field force, and the sun plate moves and collides with the dust particles during the movement, so that the dust particles are negatively charged, and the charged particles are in the electric field. Under the action of force, it also moves towards the anode. After reaching the anode, the electrons are released, and the dust particles are deposited on the anode plate, and the purified gas is discharged out of the dust collector.
According to the current domestic types of electrostatic precipitators, they can be roughly divided into the following categories: vertical and horizontal according to the direction of air flow, plate and tube according to the type of precipitation electrode, and methods for removing dust on the precipitation electrode. Divided into dry and wet.
1-anode; 2-cathode; 3-cathode rack; 4-anode upper rack;
5-insulation support; 6-quartz insulation tube; 7-cathode suspension tube;
8-cathode support frame; 9-top plate; 10-cathode rapping device;
11-Anode ramming device; 12-Cathode down frame; 13-Anode hanging hammer;
14-Shell 15-Imported first distribution board;
16- Import second distribution plate 17- Exit distribution plate; 18- Ash discharge device
Advantages of electrostatic precipitator
高 High purification efficiency, can collect fine particles of more than 0.01 microns. In the design, different operating parameters can be used to meet the required purification efficiency.
小 Small resistance loss, generally below 20 mm of water column. Compared with the cyclone dust collector, even considering the power consumption of the power supply unit and the rapping mechanism, the total power consumption is still relatively small.
(3) The operating temperature is allowed to be high. For example, the SHWB circuit dust collector is best to allow an operating temperature of 250 ° C, and other types can reach 350 ~ 400 ° C or higher.
大 Large amount of processing gas.
自动 It can fully realize automatic control of operation.
Disadvantages of electrostatic precipitator:
⑴ The equipment is relatively complicated and requires high level of equipment transportation, installation and maintenance management.
⑵ There are certain requirements for the specific resistance of dust, so there is a certain selectivity to dust, and it cannot make all dusts obtain high purification efficiency.
⑶ It is greatly affected by operating conditions such as gas temperature and temperature. The same kind of dust, such as operating at different temperatures and humidity, has different results. Some dusts work well at one temperature and humidity, while others An electrostatic precipitator can hardly be used due to changes in dust resistance at a temperature and humidity.
较大 One investment is large, and the horizontal electrostatic precipitator covers a large area.
实用 The practical effect in some enterprises does not meet the design requirements.