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-bag composite 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 cathode and the gas is ionized. At this time, negatively charged gas ions move toward the anode plates under the action of electric field force. When colliding with dust particles during movement, the dust particles become negatively charged. The charged dust particles also move toward the anode under electric field force. Upon reaching the anode, they release their electrons and deposit on the anode plates. The preliminarily purified flue gas then flows through a three-dimensional air distribution device into the filter bag chamber. The flue gas penetrates the filter bags for further filtration; dust is trapped on the outer surface of the filter bags. The clean gas after filtration gathers inside the filter bags and is discharged through the main exhaust duct.

II. Technical Features:

1. For electrode matching, 480C type anode plates are adopted together with "RSB" cathode wires, with material: SPCC.

2. The airflow distribution type adopts the baffle and flow-guiding design.

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

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

5. A new tubular barbed wire is adopted, supported by φ20 round pipes with high strength and good rigidity. Wire breakage can be avoided during operation. Meanwhile, special protective sleeves are installed at the connecting parts on both ends to prevent electrode wire detachment permanently.

6. A unique flow equalization device is arranged between the electrostatic section and the baghouse section.

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 tubes

11. Bypass protection technology

12. High-temperature resistant filter material application technology

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

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

15. Equipment resistance control: A series of distinctive considerations are incorporated into equipment design to guarantee safe and reliable overall equipment resistance from both equipment structure and filter material aspects.