Automatic cleaning device for an electric mist eliminator

Abstract

This utility model discloses an automatic cleaning device for an electrostatic precipitator, comprising an electrostatic precipitator, an underflow trough, a settling tank, a filter, and a flushing tank. The electrostatic precipitator has an inlet flue at the bottom and an outlet flue at the top. Several flushing water pipes are installed inside the electrostatic precipitator, with flushing nozzles evenly distributed on the pipes. The flue gas to be treated enters through the inlet flue at the bottom of the electrostatic precipitator and passes upwards through an internal high-voltage electric field. After electrostatic deposition removes pollutants from the flue gas, the purified flue gas is discharged through the outlet flue at the top of the electrostatic precipitator. When the deposited pollutants on the inner surface of the anode tube and the cathode wire inside the electrostatic precipitator increase and cleaning is required, the electrostatic precipitator is de-energized, and the flushing water electric control valve is remotely opened, starting the flushing pump. The flushing water is delivered to all the evenly distributed nozzles inside, effectively removing the deposited pollutants. The water then enters the underflow trough through the underflow pipes, and is transported by the underflow pump to the settling tank and filter for continuous filtration, thus achieving the removal of pollutants inside the electrostatic precipitator.

Description

Technical Field

[0001] This utility model relates to a cleaning device, specifically an automatic cleaning device for an electrostatic precipitator. Background Technology

[0002] Electrostatic precipitators (ESPs) are highly efficient flue gas purification devices, primarily used to remove fine dust, acid mist, and other aerosol pollutants from smelting flue gas. After pretreatment through a scrubbing tower (cooling and washing), the wet flue gas enters the ESP through the lower inlet duct. Inside the ESP, a 35-45kV high-voltage direct current is generated and applied between the cathode wire and the anode tube, creating a strong electric field. This high voltage ionizes the surrounding gas molecules, generating a large number of free electrons and charges. Fine dust particles, droplets, and other aerosol pollutants in the flue gas collide with these charges and become negatively charged. Under the influence of the electric field, these charged pollutant particles move directionally towards the positively charged anode tube. Upon reaching the inner surface of the anode tube, they release their charge and adhere to it. Intermittent spraying forms a liquid film that washes the gas to the bottom of the ESP and removes it. The purified flue gas is then discharged from the top outlet duct of the ESP.

[0003] In practical applications, the flue gas entering the electrostatic precipitator contains a large amount of pollutants such as dust, droplets, and other aerosols. The amount of pollutants that can be removed by the small amount of liquid film generated by intermittent spraying is very limited. After long-term operation, a large amount of pollutants accumulate on the inner wall of the anode tube and the cathode wire of the electrostatic precipitator, which greatly reduces the flue gas purification efficiency of the electrostatic precipitator. At the same time, the environmental protection indicators of the purified flue gas cannot be guaranteed. In order to ensure the normal operation of the electrostatic precipitator, it is necessary to frequently organize a large number of personnel to enter the electrostatic precipitator to manually clean the pollutants, thereby increasing the operation and maintenance costs of the electrostatic precipitator and the safety hazards in production.

[0004] Therefore, how to efficiently remove various pollutants deposited inside the electrostatic precipitator, ensure its continuous and stable operation, and guarantee the efficiency of flue gas purification and environmental compliance is a problem worthy of research. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an automatic cleaning device for an electrostatic precipitator.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An automatic cleaning device for an electrostatic precipitator includes an electrostatic precipitator, an underflow trough, a settling tank, a filter, and a flushing tank. The electrostatic precipitator has an inlet flue at the bottom and an outlet flue at the top. Several flushing water branch pipes are installed inside the electrostatic precipitator, each with several flushing nozzles. The inlet of each flushing water branch pipe is connected in parallel to the outlet of a main flushing water pipe. The inlet of the main flushing water pipe is connected to the flushing tank. The electrostatic precipitator has a pollutant underflow outlet at the bottom, with an underflow pipe at the outlet. An inclined guide plate is installed at the bottom of the electrostatic precipitator. The collected underflow liquid flows by gravity into the underflow trough through the underflow pipe under the action of the guide plate. The outlet of the underflow trough is connected to the inlet of the settling tank via a pipe. The settling tank has an overflow port and an underflow port. The overflow port is connected to the flushing tank via a pipe, and the underflow port is connected to the filter via a pipe. The outlet of the filter is connected to the flushing tank via a pipe. An external water supply pipe is also installed on the flushing tank.

[0008] Furthermore, the filter is a leaf filter, and the settling tank is an inclined plate settling tank.

[0009] Furthermore, an electrically controlled flushing water valve is installed on the main flushing water pipeline outside the electrostatic precipitator.

[0010] Furthermore, a flushing pump is installed on the main flushing water pipeline of the electrostatic precipitator so that the flushing water can be delivered to the main flushing water pipeline through the flushing pump.

[0011] Furthermore, the underflow tank outlet pipe is equipped with an underflow pump so that the underflow liquid is transported to the filter through the underflow pump.

[0012] Furthermore, a filter press pump is installed on the underflow pipe of the settling tank so that the underflow liquid of the settling tank can be transported to the filter through the filter press pump.

[0013] The flue gas to be treated enters through the bottom inlet flue of the electrostatic precipitator, passes through the internal high-voltage electric field from bottom to top, and removes pollutants such as dust and acid mist from the flue gas through electrostatic deposition. The purified flue gas is then sent out through the top outlet flue of the electrostatic precipitator. When the accumulation of contaminants on the inner surface of the anode tubes and cathode wires of the electrostatic precipitator affects its normal demisting effect and requires rinsing and cleaning, the operator first disconnects the power to the electrostatic precipitator via the central control DCS interface. Then, the operator remotely opens the electric control valve for the rinsing water and starts the rinsing pump. Constant-pressure rinsing water is delivered through the main and branch pipes to all the evenly distributed nozzles inside the electrostatic precipitator. The constant-pressure rinsing water from each nozzle sprays downwards in an umbrella shape. All the evenly distributed nozzles spray simultaneously, achieving all-round, full-coverage, and dead-angle constant-pressure rinsing inside the electrostatic precipitator. All the contaminants deposited on the inner surface of the anode tubes and cathode wires are effectively rinsed off. The rinsing liquid flows along the anode tubes to the bottom of the electrostatic precipitator and finally enters the underflow tank through the underflow pipe. After a certain period of continuous constant-pressure rinsing to meet the requirements for removing the contaminants deposited on the anode and cathode, the operator remotely stops the rinsing water pump and electric valve. An automatic cleaning process ends, and the electrostatic precipitator, now clean of contaminants, is powered back on and resumes normal operation.

[0014] After the electrostatic precipitator automatically cleans itself, the underflow liquid generated is pumped to a filter press for continuous filtration, thereby achieving the removal of various pollutants inside the electrostatic precipitator and ensuring the purification efficiency and environmental compliance of the flue gas. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal flushing structure of an electrostatic precipitator. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited thereto.

[0018] An automatic cleaning device for an electrostatic precipitator, such as Figure 1 and Figure 2As shown, an automatic cleaning device for an electrostatic precipitator includes an electrostatic precipitator 3, an underflow trough 13, an inclined plate settling tank 11, a pressurized leaf filter 9, and a flushing tank 8. The electrostatic precipitator 3 has an inlet flue 1 at its bottom and an outlet flue 4 at its top. The electrostatic precipitator 3 has several flushing water branch pipes 61 inside, each with several flushing nozzles 2. The inlet of each flushing water branch pipe 61 is connected in parallel to the outlet of the main flushing water pipe 6. The inlet of the main flushing water pipe 6 is connected to the flushing tank 8. An electrically controlled flushing water valve 5 is installed on the main flushing water pipe 6 outside the electrostatic precipitator 3. The electrostatic precipitator 3 has a pollutant underflow outlet at its bottom. The outlet is equipped with an underflow pipe, and the bottom of the electrostatic precipitator 3 is equipped with an inclined guide plate 14. The collected underflow liquid flows into the underflow tank 13 by gravity through the underflow pipe under the action of the guide plate 14. The outlet of the underflow tank 13 is connected to the inlet of the inclined plate settling tank 11 through a pipe and an underflow pump 12 installed on the pipe. The inclined plate settling tank 11 is equipped with an overflow port and an underflow port. The overflow port is connected to the flushing tank 8 through a pipe. The underflow port is connected to the pressurized leaf filter 9 through a pipe and a filter press pump 10 installed on the pipe. The outlet of the pressurized leaf filter 9 is connected to the flushing tank 8 through a pipe. The flushing tank 8 is also equipped with an external water supply pipe. The flushing tank 8 can be replenished with external water periodically as needed.

[0019] The main flushing water pipeline 6 of the electrostatic precipitator 3 is equipped with a flushing pump 7, which allows the flushing water to be delivered to the main flushing water pipeline 6 through the flushing pump 7.

[0020] The flue gas to be treated enters through the bottom inlet flue 1 of the electrostatic precipitator 3, passes through the internal high-voltage electric field from bottom to top, and removes pollutants such as dust and acid mist from the flue gas through electrostatic deposition. The purified flue gas is then sent out through the top outlet flue 4 of the electrostatic precipitator 3.

[0021] When the anode tube inner surface and cathode wire inside the electrostatic precipitator 3 accumulate pollutants and require cleaning, the electrostatic precipitator 3 is de-energized, the flushing water electric control valve 5 is remotely opened, and the flushing pump 7 is started. Constant pressure flushing water is delivered through the main flushing water pipe 6 and several flushing water branch pipes 61 to all the evenly distributed re-spraying nozzles 2 inside. This achieves all-round, full-coverage, and dead-angle constant pressure cleaning inside the electrostatic precipitator.

[0022] The deposited pollutants inside the electrostatic precipitator 3 are effectively removed. The flushing liquid flows from top to bottom to the bottom of the electrostatic precipitator 3 and finally enters the underflow tank 13 through the underflow pipe. After continuous constant pressure flushing for a certain period of time to achieve the removal requirements of the internal deposited pollutants, the flushing pump 7 and the flushing water electric control valve 5 are remotely stopped, and an automatic cleaning process ends.

[0023] The underflow liquid generated after the electrostatic precipitator 3 is automatically cleaned is transported to the inclined plate settling tank 11 by the underflow pump 12. After settling, it is transported to the pressurized leaf filter 9 by the filter press pump for continuous filtration, thereby achieving the removal effect of various pollutants inside the electrostatic precipitator 3, ensuring the flue gas purification efficiency and environmental protection standards of the electrostatic precipitator 3.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the specific implementation of this utility model and not to limit it. Those skilled in the art should understand that any equivalent substitutions or obvious modifications made to the implementation of this utility model without changing its performance or use, without violating the spirit of this utility model, should be covered within the scope of protection claimed by this utility model.

Claims

1. An automatic cleaning device for an electrostatic precipitator, characterized in that, The system includes an electrostatic precipitator, an underflow trough, a settling tank, a filter, and a flushing tank. The electrostatic precipitator has an inlet flue at the bottom and an outlet flue at the top. Several flushing water branch pipes are installed inside the electrostatic precipitator, each with several flushing nozzles. The inlet of each flushing water branch pipe is connected in parallel to the outlet of the main flushing water pipe. The inlet of the main flushing water pipe is connected to the flushing tank. The electrostatic precipitator has a pollutant underflow outlet at the bottom, with an underflow pipe at the outlet. An inclined guide plate is located at the bottom of the electrostatic precipitator. The collected underflow liquid flows by gravity into the underflow trough through the underflow pipe under the action of the guide plate. The outlet of the underflow trough is connected to the inlet of the settling tank via a pipe. The settling tank has an overflow port and an underflow port. The overflow port is connected to the flushing tank via a pipe, and the underflow port is connected to the filter via a pipe. The outlet of the filter is connected to the flushing tank via a pipe. An external water supply pipe is also installed on the flushing tank.

2. The automatic cleaning device for the electrostatic precipitator according to claim 1, characterized in that, The filter is a leaf filter, and the settling tank is an inclined plate settling tank.

3. The automatic cleaning device for the electrostatic precipitator according to claim 1, characterized in that, An electric control valve for flushing water is installed on the main flushing water pipeline outside the electrostatic precipitator.

4. The automatic cleaning device for the electrostatic precipitator according to claim 1, characterized in that, A flushing pump is installed on the main flushing water pipeline of the electrostatic precipitator so that the flushing water can be delivered to the main flushing water pipeline through the flushing pump.

5. The automatic cleaning device for the electrostatic precipitator according to claim 1, characterized in that, The underflow tank outlet pipe is equipped with an underflow pump, which allows the underflow liquid to be transported to the filter.

6. The automatic cleaning device for the electrostatic precipitator according to claim 1, characterized in that, A filter press pump is installed on the underflow pipe of the settling tank so that the underflow liquid of the settling tank can be transported to the filter through the filter pump.

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