Electrostatic-fabric precipitator

I. Working Principle

Flue gas from the boiler passes through the air preheater and pipelines into the inlet horn of the XLMC type electrostatic-fabric integrated precipitator. Two stages of air distribution plates are installed inside the inlet horn. After being distributed by the air distribution plates, the flue gas enters the electric field passage. Cathode wires and anode plates are arranged inside the electric field. When the gas containing dust particles passes through the high-voltage electric field formed between the cathode wires (also known as corona electrodes) connected to a high-voltage silicon rectifier and the grounded anode plates, corona discharge occurs at the cathodes and the gas is ionized. At this time, negatively charged gas ions move toward the anode plates under the action of electric field force and collide with dust particles during movement, charging the dust particles with negative electricity. The charged dust particles also move toward the anodes under electric field force. Upon reaching the anodes, the dust particles release their electrons and deposit on the anode plates. The preliminarily purified flue gas then flows through the three-dimensional air distribution device into the filter bag chamber. The flue gas passes through the filter bags for further filtration; dust is trapped on the outer surface of the filter bags. The clean gas after filtration collects inside the filter bags and is discharged through the main exhaust duct.

II. Technical Features:

1. For electrode matching configuration, 480C type anode plates are matched with "RSB" cathode wires, with the material being SPCC.

2. The airflow distribution type adopts the baffle plus flow guide structure.

3. The structural form of rapping hammers is improved to extend the service life of rapping hammers.

4. A new type of supporting roller rolling bearing is adopted, which not only prolongs the service life but also facilitates maintenance and replacement.

5. A new tubular barbed wire is adopted. Its support is a φ20 round pipe with high strength and good rigidity. Wire breakage can be avoided during operation. Special protective sleeves are installed at the connection parts on both ends to prevent the electrode wire from falling off permanently.

6. A unique flow equalization device is installed between the electrostatic zone and the baghouse zone.

7. Low-pressure pulse jet technology

8. Offline ash cleaning / non-stop maintenance technology

9. Fixed-tube jet ash cleaning technology

10. Fixed pulse jet pipe

11. Bypass protection technology

12. High-temperature resistant filter material application technology

13. Application of detection and monitoring technology: In accordance with the operation characteristics of the precipitator, advanced on-line detection and monitoring devices are equipped for flue gas temperature, precipitator operating pressure, material level, and operating equipment fault detection.

14. Application of PLC programmable logic controller, realizing automatic control of the precipitator as key operating equipment in power plants.

15. Equipment resistance control: Through a series of distinctive considerations in equipment design, the safety and reliability of the overall equipment resistance are guaranteed from both the equipment structure and filter material aspects.