An on-line cleaning system for a wet electrostatic precipitator

Abstract

The utility model relates to the technical field of environmental protection dust removal equipment, concretely relates to an on-line cleaning system of wet electrostatic precipitator. In which the on-line cleaning system of wet electrostatic precipitator is through the modularization design of the series connection of multiple cyclone blowing units, and is combined with the cyclone blower of the arrangement of six around anode pipe corner parts in each cyclone blowing unit, and the series connection into the closed regular hexagon ring through three-way shunt and communicating pipe, cooperates the downwardly inclined spray pipe and end nozzle, can accurately, evenly and continuously along the anode tube wall downwardly cyclone blow after the compressed high pressure gas, effectively removes the dust and liquid film, significantly improves the dust removal efficiency and continuity, guarantees the long -term efficient operation and dust removal stability of anode tube. And do not need to stop in the cleaning process, can evenly and completely clean the stubborn dirt attached to the anode tube wall, avoid the anode tube damage.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection dust removal equipment technology, specifically to an online cleaning system for a wet electrostatic precipitator. Background Technology

[0002] To adapt to the new environmental protection requirements and address the problem of harmful substances such as flue gas and fine particles entrained in the exhaust gas of boilers and other equipment, electrostatic precipitators (ESPs) can be used for purification. Traditional wet ESPs rely entirely on intermittent water mist spraying for cleaning: a continuous water film washes the collected dust into a slurry before discharge. When the flue gas has a high alkali metal content, especially after calcium-based wet desulfurization, a large number of dust-laden droplets are carried into the wet ESP, rapidly weakening the rinsing effect of the water film on the anode tubes. With prolonged operation, the particulate matter adhesion layer thickens, reducing dust removal efficiency and, in severe cases, forcing the unit to shut down. To maintain production, enterprises have long adopted a "periodic shutdown + manual cleaning" model, which interrupts the process and increases costs. Manual operation is also limited by experience and visibility, often overlooking dead corners in complex tube bundles, and accumulated dust further weakens dust removal performance, creating a vicious cycle. Therefore, it is necessary to develop a new cleaning device for wet ESPs to solve the above problems. Utility Model Content

[0003] In view of this, this utility model proposes an online cleaning system for wet electrostatic precipitators, which can at least solve the problem that existing wet electrostatic precipitators are difficult to clean online and have poor cleaning effects.

[0004] The online cleaning system for a wet electrostatic precipitator proposed in this utility model includes a cyclone blowing module and an air intake system. The cyclone blowing module is formed by multiple cyclone blowing units connected in series. Each cyclone blowing unit is coaxially aligned with an anode tube with a regular hexagonal cross-section and includes six cyclone blowers and a connecting pipe. Each cyclone blower includes a three-way distributor with three connectors evenly distributed at 120° angles. Each connector is connected to a blowpipe. The axis of the blowpipe is inclined downwards at a predetermined angle relative to the axis of its connector, and each blowpipe has a nozzle at its end. The two ends of the connecting pipe are respectively connected to the connectors of the three-way distributors of two adjacent cyclone blowers, thereby connecting the six cyclone blowers in series and forming a closed regular hexagonal ring structure. The intake system includes an intake header and multiple intake branches; the intake header is connected to the air source, and one end of each intake branch is connected to the intake header, while the other end is connected to any unconnected connector in the cyclone purging module, for supplying compressed gas to the cyclone purging unit.

[0005] In some embodiments, the three blowpipes of each cyclone blower are symmetrically distributed about the center of the three-way splitter, and on the projection plane perpendicular to the central axis of the three-way splitter, the projection of each blowpipe is parallel to the projection of the adjacent connector.

[0006] In some embodiments, there are multiple cyclone purging modules, which are connected in parallel through an air intake system to form a cyclone purging system.

[0007] In some embodiments, the intake manifold is also provided with an intake master valve, a pressure reducing valve, and a pressure gauge.

[0008] In some embodiments, a branch valve is also provided on the intake branch pipe.

[0009] In some embodiments, each connecting pipe is further provided with a fixing clip for clamping onto the upper edge of the anode pipe.

[0010] In some embodiments, the nozzle is a replaceable spherical nozzle, and the end of the blowpipe is provided with a tapered thread structure adapted to the spherical nozzle.

[0011] In some embodiments, the connecting pipe and the connector are connected by a flange, and a sealing cap is provided in any connector in the cyclone purging module except for one that is not connected to the connecting pipe and is connected to the intake branch pipe.

[0012] In some embodiments, the axis of the blowpipe is inclined downward at a predetermined angle of 15° to 30° relative to the axis of the connector in which it is located.

[0013] In some embodiments, the three-way splitter, the jet pipe, and the connecting pipe are all made of corrosion-resistant material, which is selected from polyethylene, polypropylene, or 2205 duplex stainless steel.

[0014] The beneficial effects of this utility model are as follows: This application adopts a modular design consisting of multiple cyclone purging units connected in series. Each cyclone purging unit contains six cyclone purgers arranged around the corners of the anode tube and connected in series via a three-way distributor and connecting pipe to form a closed regular hexagonal ring. Combined with a downward-sloping blowpipe and end nozzle, it can accurately, evenly, and continuously blow compressed high-pressure gas downwards along the anode tube wall, effectively removing accumulated ash and liquid film, significantly improving cleaning efficiency and continuity, and ensuring the anode tube's long-term efficient operation and dust removal stability. Furthermore, the cleaning process does not require machine shutdown, and it can evenly and thoroughly clean stubborn scale adhering to the anode tube wall, avoiding damage to the anode tube. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the overall structure of an online cleaning system for a wet electrostatic precipitator provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of the cyclone sweeper. Figure 3 This is a side view of the cyclone sweeper; Figure 4 This is a schematic diagram of the cyclone purging unit. Figure 5 This is a structural schematic diagram of the cyclone purging module.

[0017] Explanation of reference numerals in the attached figures: 10. Cyclone purger; 11. Purge pipe; 12. Connector; 13. Three-way distributor; 20. Cyclone purge unit; 21. Fixing clip; 22. Connecting pipe; 30. Cyclone purge module; 41. Inlet branch pipe; 50. Cyclone purge system; 51. Main valve; 52. Inlet header; 53. Pressure reducing valve; 54. Pressure gauge; 55. Branch valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to specific examples and accompanying drawings.

[0019] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0020] like Figure 1 As shown, the online cleaning system for a wet electrostatic precipitator according to the first aspect of this utility model includes a cyclone blowing module 30 and an air intake system. The cyclone blowing module 30 is formed by multiple (e.g., 40 to 600) cyclone blowing units 20 connected in series (e.g., ...). Figure 4 and Figure 5As shown), the cyclone purging unit 20 is roughly hexagonal in shape, with the sides of the hexagons of adjacent cyclone purging units 20 overlapping. The cyclone purging module 30 is roughly honeycomb in shape. Each cyclone purging unit 20 is coaxially positioned with an anode tube with a hexagonal cross-section and includes six cyclone purgers 10. Each cyclone purger 10 corresponds to a corner of the hexagonal anode tube. Each cyclone purger 10 includes a three-way splitter 13, which includes three connectors 12 evenly distributed at 120° angles. Each connector 12 is connected to a jet pipe 11 for ejecting gas (e.g., ...). Figure 2 (As shown). The axis of the blowpipe 11 is inclined downward at a predetermined angle α relative to the axis of the connector 12 where it is located. The predetermined angle α can be 15°~30° (e.g., Figure 3 As shown in the diagram, the ejected gas flows downwards along the wall of the anode tube, and each blowpipe 11 has a nozzle at its end for blowing high-pressure gas. The two ends of the connecting pipe 22 are respectively connected to the connectors 12 of the three-way splitters 13 of two adjacent cyclone purgers 10, thereby connecting the six cyclone purgers 10 in series and forming a closed regular hexagonal ring structure. That is, each connecting pipe 22 is parallel to the upper edge of the regular hexagonal anode tube. The air intake system includes an air intake main pipe 52 and multiple air intake branch pipes 41. One end of the air intake main pipe 52 is connected to a gas source, and one end of each air intake branch pipe 41 is connected to the air intake main pipe 52, while the other end is connected to any connector 12 in the cyclone purge module 30 that is not connected to the connecting pipe 22, for supplying compressed gas to that cyclone purge unit 20.

[0021] The online cleaning system for wet electrostatic precipitators proposed in the first aspect of this utility model employs a modular design consisting of multiple cyclone blowing units 20 connected in series. Each cyclone blowing unit 20 contains six cyclone blowers 10 arranged around the corners of the anode tube and connected in series via a three-way distributor 13 and a connecting pipe 22 to form a closed regular hexagonal ring. Combined with a downward-sloping blowpipe 11 and an end nozzle, this system can precisely, evenly, and continuously blow compressed high-pressure gas downwards along the anode tube wall, effectively removing accumulated ash and liquid film. This significantly improves cleaning efficiency and continuity, ensuring the anode tube's sustained high-efficiency operation and dust removal stability. Furthermore, the system can be cleaned without stopping the machine, ensuring a uniform and thorough removal of stubborn scale adhering to the anode tube wall and preventing damage to the anode tube.

[0022] In some embodiments, such as Figure 2As shown, the three blowpipes 11 of each cyclone purger 10 are symmetrically distributed about the center of the three-way distributor 13. On a projection plane perpendicular to the central axis of the three-way distributor 13, the projection of each blowpipe 11 is parallel to the projection of its adjacent connector 12, ensuring that the nozzles on each blowpipe 11 can be aimed at one wall of the anode tube for airflow, thus ensuring that each wall of the anode tube is uniformly cleaned. This arrangement ensures that high-pressure gas uniformly and synchronously covers every corner area of ​​the anode tube wall from multiple angles, completely eliminating cleaning dead zones and avoiding mutual interference between airflows, thereby significantly improving the uniformity, stability, and overall cleaning efficiency of the cleaning process.

[0023] In some embodiments, such as Figure 1 As shown, there are multiple cyclone purging modules 30, which are connected in parallel through an air intake system. These multiple cyclone purging modules 30 form a cyclone purging system 50, which can completely cover the upper end of the anode tube bundle. This design ensures that all anode tubes can receive high-pressure gas with stable pressure and sufficient flow for synchronous cleaning. This not only achieves efficient and thorough purging of the entire dust collector cross section, but also significantly improves the system's processing capacity and reliability, making it perfectly suited for large-scale industrial applications.

[0024] In some embodiments, such as Figure 1 As shown, the main air inlet pipe 52 is also equipped with an air inlet valve 51, a pressure reducing valve 53, and a pressure gauge 54. The main air inlet valve 51 serves as the main switch for the system's air supply, responsible for the start-up and shutdown control of the entire purging system, ensuring safe shut-off during equipment maintenance and emergencies. The pressure reducing valve 53 is primarily used to precisely and stably reduce the air source pressure to the system's required operating range of 0.4~0.6MPa, thereby ensuring the airflow velocity from the nozzles is 15~20m / s. This provides the ejected gas with sufficient momentum and shear force to effectively peel off the accumulated ash and liquid film on the anode tube wall. Simultaneously, it avoids excessive velocity leading to excessive droplet splashing and "secondary smog" or a surge in energy consumption, as well as insufficient ash removal due to excessive velocity. This achieves an optimal balance between operating efficiency and cost while ensuring excellent cleaning results. The pressure gauge 54 displays the actual working pressure after pressure reduction in real time, providing operators with crucial status monitoring and adjustment data to ensure that the ash removal operation always operates efficiently and stably under the design parameters.

[0025] In some embodiments, such as Figure 5As shown, the intake branch pipe 41 is also equipped with a branch pipe valve 55, which is used to achieve independent and precise control of individual or grouped cyclone purging modules 30. Operators can flexibly close specific branch pipe valves 55 to isolate and repair the corresponding cyclone purging module 30 without shutting down the system, greatly improving the convenience and flexibility of system maintenance; at the same time, the branch pipe valve 55 can also be used to fine-tune the gas flow of each branch, ensuring the pressure balance of each module connected in parallel, thereby ensuring the consistency and stability of the dust removal effect in the entire anode tube bundle area.

[0026] In some embodiments, such as Figure 4 As shown, each connecting pipe 22 is also equipped with a fixing clip 21 for clamping onto the upper edge of the anode tube. The fixing clip 21 is fitted into the middle of the connecting pipe 22, and its structure can be a U-bolt clamp, a spring quick-clamp clamp, a half-clamp (two-half type) clamp, or a P-type pipe clamp. By firmly clamping and fixing the connecting pipe 22 to the upper edge of the anode tube, pipe displacement or vibration caused by airflow backlash or equipment vibration is effectively prevented, ensuring the long-term accuracy and consistency of the blowing direction of each nozzle, thereby ensuring the stable and reliable dust removal effect and extending the service life of the system.

[0027] In some embodiments, the nozzle is a replaceable spherical nozzle, and the end of the blowpipe 11 is provided with a tapered thread structure adapted to the spherical nozzle. This embodiment uses a combination of a replaceable spherical nozzle and a tapered thread structure, which significantly improves the maintainability and performance controllability of the system, allowing operators to quickly replace the nozzle according to wear conditions or process requirements, greatly reducing maintenance costs and time, while ensuring the long-term stability of the cleaning airflow direction and power.

[0028] In some embodiments, the connecting pipe 22 and the connector 12 are connected by flanges. For example, flanges are installed at the ends of both the connector 12 and the connecting pipe 22, and the edges of the two flanges are connected by a series of bolts. A seal (such as a silicone rubber gasket) can also be provided between the two flanges to effectively prevent high-pressure gas leakage and enhance the overall structural integrity of the module. In the cyclone purging module 30, a sealing cap is provided at any connector 12 that is not connected to the connecting pipe 22 except for the one connected to the intake branch pipe 41. This allows the cyclone purging module 30 to form a closed and self-circulating purging loop, ensuring stable and uniform gas pressure distribution in all purging units, avoiding energy loss, simplifying the system structure, and making the intake point arrangement more flexible and reliable.

[0029] In some embodiments, the three-way splitter 13, the blowpipe 11, and the connecting pipe 22 are all made of corrosion-resistant materials. The corrosion-resistant materials are selected from polyethylene, polypropylene, or 2205 duplex stainless steel. These materials can effectively resist the erosion of corrosive gases and liquid films, prevent the components from rusting, being damaged, or becoming blocked, thereby ensuring the long-term unobstructed and stable flow of high-pressure airflow channels, extending the service life of the equipment, and maintaining continuous and efficient dust removal performance.

[0030] The working principle and method of the online cleaning system for wet electrostatic precipitators proposed in this utility model are as follows: The pressure difference between different areas above the anode tube bundle of the wet electrostatic precipitator is detected. When the pressure difference in a certain area exceeds a set threshold (indicating that the anode tube bundle in that area is blocked due to excessive dust adhesion), the branch valve 55 of the cyclone purging module 30 corresponding to that area is opened to blow compressed gas into the anode tube bundle in that area. After purging is completed, the branch valve 55 is closed, and the next set of inlet branch valves 41 is opened to purge the next anode tube bundle area. This process is repeated until all areas are purged. Specifically, before purging, the following steps are also included: First, check and confirm that all inlet branch valves 41 are closed, and then open the main inlet valve 51. Check the pressure gauge 54 and control it at 0.4~0.6MPa to form high-pressure gas at the nozzle.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An on-line cleaning system for a wet electrostatic precipitator, characterized by include: The cyclone purging module (30) is formed by multiple cyclone purging units (20) connected in series. Each cyclone purging unit (20) is coaxially positioned with an anode tube with a regular hexagonal cross-section and includes: Six cyclone blowers (10), each of which includes a three-way splitter (13) comprising three connectors (12) evenly spaced at 120°, each connector (12) connected to a blowpipe (11); the axis of each blowpipe (11) is inclined downward at a predetermined angle relative to the axis of its respective connector (12), and each blowpipe (11) has a nozzle at its end; and The two ends of the connecting pipe (22) are respectively connected to the connectors (12) of the three-way splitter (13) of the two adjacent cyclone blowers (10), so that the six cyclone blowers (10) are connected in series and form a closed regular hexagonal ring structure. The air intake system includes an air intake main pipe (52) and multiple air intake branch pipes (41); the air intake main pipe (52) is connected to an air source, and one end of each of the air intake branch pipes (41) is connected to the air intake main pipe (52), and the other end is connected to the connector (12) of any one of the cyclone purging modules (30) that is not connected to the connecting pipe (22), for supplying compressed gas to the cyclone purging unit (20).

2. The in-line cleaning system of claim 1, wherein, The three blowpipes (11) of each of the cyclone blowers (10) are symmetrically distributed about the center of the three-way splitter (13), and on the projection plane perpendicular to the central axis of the three-way splitter (13), the projection of each blowpipe (11) is parallel to the projection of the adjacent connector (12).

3. The in-line cleaning system of claim 1, wherein, There are multiple cyclone purging modules (30), and the multiple cyclone purging modules (30) are connected in parallel through the air intake system to form a cyclone purging system (50).

4. The in-line cleaning system of claim 1, wherein, The intake manifold (52) is also equipped with an intake valve (51), a pressure reducing valve (53), and a pressure gauge (54).

5. The in-line cleaning system of claim 1, wherein, The intake branch pipe (41) is also equipped with a branch pipe valve (55).

6. The in-line cleaning system of claim 1, wherein, Each connecting tube (22) is also provided with a fixing clip (21) for clamping the upper edge of the anode tube.

7. The in-line cleaning system of claim 1, wherein, The nozzle is a replaceable spherical nozzle, and the end of the blow pipe (11) is provided with a tapered thread structure adapted to the spherical nozzle.

8. The in-line cleaning system of claim 1, wherein, The connecting pipe (22) is connected to the connector (12) via a flange. In the cyclone purging module (30), a sealing cap is provided in any connector (12) that is not connected to the connecting pipe (22) except for the one connected to the air intake branch pipe (41).

9. The in-line cleaning system of claim 1, wherein, The predetermined angle is 15°~30°.

10. The in-line cleaning system of claim 1, wherein, The three-way splitter (13), the jet pipe (11), and the connecting pipe (22) are all made of corrosion-resistant materials, which are selected from polyethylene, polypropylene, or 2205 duplex stainless steel.

Images