Internal cleaning device for a wet electro-precipitator

Abstract

The utility model discloses a kind of wet electric demister internal cleaning devices, including lifting rod, lifting rope, water delivery hose, upper spray pipe, lower spray pipe, spray connecting pipe and anode pipe scraper, upper spray pipe and lower spray pipe are arc and are arranged around the barb on cathode corona wire, upper spray pipe and lower spray pipe are connected by spray connecting pipe, lifting rope is connected on upper spray pipe, the top of lifting rope and lifting rod are connected to make cleaning device hang below lifting rod by lifting rope, upper spray pipe and water delivery hose are communicated, and the inside and outside of upper spray pipe and the inside and outside of lower spray pipe are each equipped with several spray heads, and anode pipe scraper that is adapted to the inner wall of wet electric demister anode pipe is equipped on spray connecting pipe. Wet electric demister internal cleaning device is integrated by automatic lifting, spraying and scraping, realizes the automatic cleaning of cathode wire and anode pipe in wet electric demister.

Description

Technical Field

[0001] This utility model relates to the technical field of wet electrostatic precipitators, specifically to an internal cleaning device for a wet electrostatic precipitator. Background Technology

[0002] A wet electrostatic precipitator is a highly efficient and environmentally friendly device primarily used to remove fine particulate matter, acid mist, droplets, aerosols, and other pollutants from industrial waste gases. It combines wet scrubbing technology with traditional dry electrostatic precipitators, making it particularly suitable for treating complex flue gases that are high in humidity, temperature, flammable, explosive, or highly corrosive.

[0003] At the center of the electrostatic precipitator, cathode corona wires, typically linear, needle-like, or spiral in shape, are arranged. A DC negative high voltage of tens of thousands of volts is applied to them. Under this high voltage, gas molecules around the discharge electrode are ionized, generating a large number of free electrons and negative ions, forming a "corona region." This process is called "corona discharge." When flue gas carrying pollutants (such as droplets, dust, and aerosols) passes through the electric field, these pollutants collide with the negative ions and electrons generated in the corona region and adhere to them, thus acquiring a negative charge. Under the influence of a strong electric field force (Coulomb force), the negatively charged pollutants move directionally towards the anode (precipitating electrode). The anode is usually made of a metal plate, conductive fiberglass, or other conductive materials, and is tubular or plate-shaped. After reaching the anode surface, the charged pollutants release their charge and are adsorbed onto the anode wall.

[0004] However, the efficient and stable operation of wet electrostatic precipitators is highly dependent on the cleanliness of their anode depositing electrode and cathode corona wire. After long-term continuous operation, contaminants will continuously adsorb and deposit on the anode wall and cathode corona wire, leading to two major problems: First, the accumulated contaminants will significantly weaken the electric field strength, affecting the corona discharge effect and causing a sharp drop in the equipment's demisting efficiency; second, an excessively thick deposit layer may trigger a "reverse corona" phenomenon and significantly increase the system's operating energy consumption.

[0005] To address this issue, the commonly used maintenance method is to periodically manually enter the equipment for flushing. This method has several significant drawbacks: The working environment is extremely harsh: the equipment's interior is enclosed and humid, and there is long-term contact with residual acidic pollutants, posing safety risks such as slipping and corrosion. Furthermore, toxic and harmful gases may accumulate inside, or there may be a lack of oxygen, posing a threat to the health of workers.

[0006] Significant safety hazards: Manual entry into the interior of large containers is a confined space operation, which requires strict adherence to complex procedures for power outage, tagging, ventilation, and monitoring. The process is cumbersome, and any oversight could lead to a serious safety accident.

[0007] The rinsing effect is difficult to guarantee: The core problem is that the anode tube (precipitating electrode) of the wet electrostatic precipitator is usually a honeycomb tube bundle several meters long. When manually rinsed with a water gun from the outside, it can only clean the area near the tube opening. For the deposits in the middle and back of the tube and the inner wall deep inside, the water flow impact force has been greatly reduced, and it cannot be effectively peeled off, leaving cleaning dead corners.

[0008] High maintenance costs: A single manual rinse takes several hours, during which the equipment must be shut down, causing production interruptions. This inefficient maintenance method not only consumes a lot of manpower and time, but also shortens the effective operating cycle due to incomplete cleaning, creating a vicious cycle of "frequent shutdowns - ineffective cleaning - poor performance".

[0009] Therefore, traditional manual flushing methods have become a bottleneck restricting the long-term stable operation of wet electrostatic precipitators. How to innovate the cleaning technology to achieve comprehensive, uniform, and automated effective flushing of the deep interior of the anode tubes while minimizing flushing time and downtime is a crucial and urgent problem to be solved in order to improve the overall performance of the equipment, ensure safe production, and achieve long-term stable ultra-low emissions. Utility Model Content

[0010] In view of this, the purpose of this utility model is to provide an internal cleaning device for a wet electrostatic precipitator.

[0011] To achieve the above objectives, this utility model provides the following technical solution: An internal cleaning device for a wet electrostatic precipitator includes a lifting rod, a lifting rope, a water supply hose, an upper spray pipe, a lower spray pipe, a spray connecting pipe, and an anode tube scraper. Both the upper and lower spray pipes are arc-shaped and arranged around the barbs on the cathode corona wire. The upper and lower spray pipes are connected by a spray connecting pipe. The lifting rope is connected to the upper spray pipe, and the top end of the lifting rope is connected to the lifting rod, so that the cleaning device is suspended below the lifting rod by the lifting rope. The upper spray pipe and the water supply hose are connected, and several nozzles are provided on the inner and outer sides of both the upper and lower spray pipes. The spray connecting pipe is equipped with an anode tube scraper that is adapted to the inner wall of the anode tube of the wet electrostatic precipitator.

[0012] Furthermore, the anode tube scraper has 2 to 6 blades, which are arranged symmetrically.

[0013] The dust removal function of a wet electrostatic precipitator is mainly achieved through the electric field formed between the anode tube and the cathode corona wire, thereby effectively removing pollutants. The cathode corona wire is suspended from the cathode beam and connected to a power source, and its surface is covered with dense barbs. The tips of these barbs have a "sharp effect," which can highly concentrate the electric field, thus inducing a strong corona discharge even at a relatively low voltage. The cleaning device consists of an upper spray pipe and a lower spray pipe connected by a spray connecting pipe, with several nozzles installed both inside and outside. The cleaning device is connected to a lifting rod via a lifting rope, enabling it to move up and down inside the anode tube to complete the full-range rinsing of the entire anode tube. The internal nozzles are responsible for rinsing the cathode corona wire and the barbs on its surface, while the external nozzles are used to rinse the inner wall of the anode tube. Anode tube scrapers are installed on the side wall of the cleaning device, and their width matches the width of one side wall of the anode tube. Depending on the specific structure of the anode tube, 2 to 6 scrapers can be configured, usually arranged symmetrically in pairs to ensure that the device does not shift when moving up and down inside the anode tube. The main function of the scrapers is to scrape off the pollutants adhering to the inner wall of the anode tube after rinsing. The water supply hose is connected to the cleaning device, providing cleaning water to the lower spray pipe, upper spray pipe, and nozzles. The other end of the hose is connected to an external pressure pump, ensuring effective cleaning by supplying high-pressure water.

[0014] This invention achieves comprehensive and efficient automatic cleaning of the anode tubes and cathode wires inside a wet electrostatic precipitator through an integrated design of automatic lifting, spraying, and scraping. This device effectively avoids the risks associated with manual entry into the confined space, fundamentally eliminating safety hazards. Simultaneously, it can move along the entire length of the anode tube inside the equipment, applying high-pressure rinsing and mechanical scraping, thoroughly solving the cleaning dead zones problem inherent in traditional manual rinsing, significantly improving cleaning effectiveness and consistency. Furthermore, this device is easy to operate, and the rinsing process is concentrated and rapid, greatly shortening rinsing operation time and equipment downtime maintenance cycles, helping to improve equipment operating efficiency and continuity, and reducing overall maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0016] 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.

[0017] An internal cleaning device for a wet electrostatic precipitator, such as Figure 1As shown, the device includes a lifting rod 1, a water supply hose 3, a spray connection pipe 4, an anode tube scraper 5, a lower spray pipe 8, an upper spray pipe 9, nozzles 10, and a lifting rope 11. Both the upper spray pipe 9 and the lower spray pipe 8 are arc-shaped and arranged around the barbs 7 on the cathode corona wire 12. The upper spray pipe 9 and the lower spray pipe 8 are connected by the spray connection pipe 4. A lifting rope 11 is connected to the upper spray pipe 9, and the top of the lifting rope 11 is connected to the lifting rod 1, thus suspending the cleaning device below the lifting rod 2 via the lifting rope 11. The upper spray pipe 9 and the water supply hose 3 are connected, and several nozzles 10 are provided on the inner and outer sides of both the upper spray pipe 9 and the lower spray pipe 8. The spray connection pipe 4 is equipped with an anode tube scraper 5 that is adapted to the inner wall of the anode tube 6 of the wet electrostatic precipitator.

[0018] The dust removal function of the wet electrostatic precipitator is mainly achieved through the electric field formed between the anode tube 6 and the cathode corona wire 12, thereby effectively removing pollutants.

[0019] The cathode corona wire 12 is suspended on the cathode beam 2 and connected to a power source, and its surface is covered with dense barbs 7. The tips of these barbs 7 have a "sharp effect", which can concentrate the electric field, thereby inducing strong corona discharge at a relatively low voltage.

[0020] The cleaning device is connected to the lifting rod 1 via the lifting rope 11, enabling it to move up and down inside the anode tube 6 and complete the full-range rinsing of the entire anode tube 6.

[0021] The internal nozzle 10 is responsible for rinsing the cathode corona wire 12 and the barbs 7 on its surface, while the external nozzle 10 is used to rinse the inner wall of the anode tube 6.

[0022] An anode tube scraper 5 is installed on the outer wall of the spray connection pipe, the width of which matches the width of one side wall of the anode tube 6. Depending on the specific structure of the anode tube 6, 2 to 6 anode tube scrapers 5 can be configured, usually arranged in pairs symmetrically to ensure that the device does not shift when running up and down inside the anode tube 6. The main function of the anode tube scraper 5 is to scrape off contaminants adhering to the inner wall of the anode tube 6 after rinsing.

[0023] The water supply hose 3 is connected to the cleaning device, providing cleaning water to the lower spray pipe 8, upper spray pipe 9, and nozzle 10. The other end of the water supply hose 3 is connected to an external pressure pump, ensuring the cleaning effect by supplying high-pressure water.

[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 internal cleaning device for a wet electrostatic precipitator, characterized in that, The device includes a lifting rod, a lifting rope, a water supply hose, an upper spray pipe, a lower spray pipe, a spray connection pipe, and an anode tube scraper. Both the upper and lower spray pipes are arc-shaped and arranged around the barbs on the cathode corona wire. The upper and lower spray pipes are connected by a spray connection pipe. The upper spray pipe is connected to a lifting rope, and the top of the lifting rope is connected to the lifting rod, so that the cleaning device is suspended below the lifting rod by the lifting rope. The upper spray pipe and the water supply hose are connected, and several nozzles are provided on the inner and outer sides of both the upper and lower spray pipes. The spray connection pipe is equipped with an anode tube scraper that is adapted to the inner wall of the anode tube of the wet electrostatic precipitator.

2. The internal cleaning device for a wet electrostatic precipitator according to claim 1, characterized in that, The anode tube scraper has 2 to 6 blades, which are arranged symmetrically.

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