Air preheater high pressure cleaning device arrangement method and high pressure online flushing method

Abstract

The present application relates to the technical field of air preheater cleaning, and discloses an air preheater high-pressure cleaning device arrangement method and a high-pressure online flushing method.The cleaning device comprises a high-pressure waterway assembly, a fixing assembly and a nozzle assembly.The nozzle assembly is arranged at the bottom of the air preheater in a preset flushing area and is accurately adapted to the layered structure of the heating surface of the air preheater, which is reversed, with the hot end on top and the cold end on bottom.The fixing assembly is adapted to the profile of the blowing area at the bottom of the air preheater, thereby positioning and fixing the nozzle assembly at a preset distance from the heating surface.The high-pressure waterway assembly is arranged along the support at the bottom of the air preheater and forms a closed loop waterway with the high-pressure cleaning water pump through a high-pressure sealing structure.The present application can improve the adaptability of the cleaning medium to stubborn ash deposits to improve the cleaning efficiency, optimize the movement trajectory of the cleaning mechanism to adapt to the rotation characteristics of the air preheater to eliminate ash accumulation dead angles, improve the versatility of the cleaning equipment and reduce the operating cost and energy consumption.

Description

Technical Field

[0001] This invention relates to the technical field of air preheater cleaning, and in particular to a method for arranging a high-pressure cleaning device for an air preheater and a method for high-pressure online flushing. Background Technology

[0002] Rotary three-compartment air preheaters are key heat exchange equipment in thermal power units. Their heating surfaces are prone to ash blockage due to flue gas dust accumulation, leading to decreased heat exchange efficiency, increased energy consumption, and even equipment failure. Precise control of the cleaning process, in coordination with the unit's control system, is crucial for ensuring stable system operation. As the core department responsible for monitoring, automatically adjusting, and interlocking the parameters of key power plant equipment, the thermal control department needs to accurately control and remotely regulate the cleaning status using parameters such as air preheater differential pressure and current. This requires a deep integration of cleaning technology with the thermal control system.

[0003] Existing cleaning technologies have many shortcomings and lack adaptability: the cleaning media has a weak ability to remove stubborn ash deposits; the cleaning trajectory is not adapted to the rotation characteristics of the air preheater and is prone to leaving dead zones; there is no perfect detection and feedback mechanism, making it difficult for the thermal control department to accurately judge the cleaning effect, often resulting in over-cleaning or incomplete cleaning; some equipment is not compatible with DCS remote control and cannot be integrated into the thermal control automatic regulation loop; moreover, they have poor versatility and high energy consumption, which not only increases the difficulty of regulation for the thermal control department, but also does not meet the requirements of efficient and energy-saving management. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to improve the compatibility of the cleaning medium with stubborn ash to improve cleaning efficiency, optimize the motion trajectory of the cleaning mechanism to adapt to the rotation characteristics of the air preheater to eliminate dead angles of ash accumulation, add an effective ash accumulation detection feedback mechanism to accurately control the cleaning effect, improve the versatility of the cleaning equipment and reduce operating costs and energy consumption.

[0005] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a method for arranging a high-pressure cleaning device for an air preheater. The cleaning device includes a high-pressure water circuit assembly, a fixing assembly, and a nozzle assembly. The nozzle assembly is oriented to a predetermined rinsing area at the bottom of the cold end of the air preheater, with its spray direction set along the reverse direction of the air preheater. The spray path extends vertically from top to bottom along the layered structure of the heated surface, matching the spatial arrangement of the layered structure. The fixing assembly is arranged to conform to the contour of the soot blowing area at the bottom of the air preheater, thus fixing the nozzle assembly at a predetermined distance from the heated surface of the air preheater. The high-pressure water circuit assembly is oriented along the bottom support of the air preheater.

[0006] In a preferred embodiment of the arrangement method of the high-pressure cleaning device for the air preheater according to the present invention: the cleaning device further includes a control component, which is integrated into the local control cabinet of the air preheater. The control component has a built-in control interface with status display and parameter monitoring functions. The control component establishes bidirectional signal connections with the nozzle drive mechanism, the pressure detection component, and the high-pressure cleaning water pump through wired signal cables. The control component outputs a spray angle adjustment control signal to the nozzle drive mechanism and a start / stop and pressure adjustment control signal to the high-pressure cleaning water pump. The pressure detection component feeds back the high-pressure detection signal collected by the water circuit and the self-operating status signal collected by the nozzle drive mechanism to the control component. The monitoring parameters and operating status are displayed in real time through the control interface, forming a closed-loop signal linkage between command output and status feedback. The high-pressure water circuit component is connected to the high-pressure cleaning water pump through a high-pressure sealing structure, forming a closed-loop water circuit for high-pressure water supply.

[0007] In a preferred embodiment of the arrangement method of the high-pressure cleaning device for the air preheater according to the present invention: the arrangement range of the nozzle assembly fully covers the easily clogged areas corresponding to the radial seal and axial seal of the air preheater, and the flushing water flow of the nozzle assembly acts perpendicularly on the surface of the clogged area of ​​the heated surface of the air preheater.

[0008] In a preferred embodiment of the arrangement method of the high-pressure cleaning device for the air preheater described in this invention: the fixing component includes a mounting housing, a fastening nut and a flat washer, and the mounting housing has nozzle mounting holes with uniform spacing. Unused mounting holes are sealed with plugs to adapt to different rinsing range requirements.

[0009] In a preferred embodiment of the arrangement method of the high-pressure cleaning device for the air preheater according to the present invention: the high-pressure water circuit assembly includes a 90° long-radius bend, which is fixed to the bottom support of the air preheater by U-bolts.

[0010] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a high-pressure online flushing method for an air preheater, which adopts an arrangement method for a high-pressure cleaning device for an air preheater, including the following steps: switching the control mode through a control interface; starting the water system and confirming that the initial flushing water pressure meets the standard through the control interface; starting the high-pressure cleaning water pump, monitoring the current status through the control interface, adjusting the water pressure to the preset flushing pressure, and the nozzle assembly completing directional flushing according to a step-back trajectory; circulating flushing as needed, and monitoring the pressure relief status through the control interface after flushing is completed, and stopping the valve after the pressure is normal.

[0011] In a preferred embodiment of the high-pressure online flushing method for air preheaters described in this invention: the control interface of the control component includes a control option area, a mode switching area, a start / stop control area, and an operating status area; the control option area is provided with several sets of option buttons for selecting and switching different functions; the mode switching area includes DCS mode and local mode, wherein the DCS mode is a remote centralized control mode and the local mode is a field control mode; the start / stop control area includes a start program button and an end program button for controlling the start and stop of the cleaning device program; and the operating status area intuitively displays the operating status of the currently selected program.

[0012] In a preferred embodiment of the high-pressure online flushing method for the air preheater described in this invention: before switching the control mode, the high-pressure cleaning water pump is subjected to insulation testing and energized, the oil level and quality of the water pump are checked to ensure they meet the standards, a support is erected at the bottom of the air preheater ash discharge pipe and the ash discharge operation is completed until negative pressure is formed in the ash discharge pipe.

[0013] In a preferred embodiment of the high-pressure online flushing method for air preheaters described in this invention: the initial flushing water pressure is ≥0.3MPa, the preset flushing pressure is 18~30MPa, and the outlet pressure of the high-pressure cleaning water pump is monitored in real time through the control interface between 25~30MPa during the flushing process.

[0014] In a preferred embodiment of the high-pressure online flushing method for the air preheater described in this invention: during the flushing process, an on-site inspection is carried out every half hour to confirm that the nozzle assembly is not stuck. If the air preheater current or differential pressure is abnormally increased through the control interface, the machine is immediately shut down. After one flushing cycle is completed, the flushing process is repeated every 300 seconds as needed. After the machine is shut down, it is necessary to observe that no sewage is discharged from the ash discharge pipe at the bottom of the air preheater within 10 minutes before closing the ash discharge door.

[0015] The beneficial effects of this invention are as follows: This invention significantly enhances the cleaning medium's ability to remove stubborn ash deposits by optimizing the layout of the cleaning device and rinsing parameters, thereby significantly improving cleaning efficiency. Simultaneously, the precise matching of the cleaning mechanism's movement trajectory with the air preheater's rotational characteristics enables full-range cleaning of the heated surface, effectively eliminating ash accumulation dead zones. Furthermore, relying on a robust detection and feedback mechanism, the cleaning effect can be precisely controlled, avoiding over-cleaning or incomplete cleaning, reducing equipment wear and ensuring the air preheater's heat exchange efficiency. In addition, the equipment is highly adaptable, compatible with air preheaters of different specifications and models, reducing equipment purchase and maintenance costs. The optimized equipment operating structure also reduces operating noise and energy consumption, meeting the industry's demand for energy conservation and environmental protection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A structural diagram of a high-pressure cleaning device is shown.

[0017] Figure 2 A top view of the high-pressure cleaning device is shown.

[0018] Figure 3 A side view of the installation of the high-pressure cleaning device is shown.

[0019] Figure 4 A schematic diagram of the nozzle assembly installation location is shown.

[0020] Figure 5 The diagram shows the connection relationship between the control components, the nozzle drive mechanism, the pressure detection component, and the high-pressure cleaning water pump.

[0021] Figure 6 A structural diagram of the fixed component is shown.

[0022] Figure 7 The control interface of the control component is shown.

[0023] Figure 8 The sequential control interface of the cleaning device is shown.

[0024] Figure 9 An alarm interface is displayed.

[0025] Figure 10 A flowchart illustrating the steps of the high-pressure online flushing method for an air preheater is shown. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0028] Reference Figures 1-10This embodiment provides a method for arranging a high-pressure cleaning device for an air preheater. The cleaning device Q includes a high-pressure water circuit assembly 100, a fixing assembly 200, and a nozzle assembly 300. The air preheater is a rotary three-compartment air preheater. This arrangement method takes into account the layered structure of the air preheater's heated surface with the hot end on top and the cold end on the bottom, as well as the rotor's reverse rotation operation, to achieve precise directional placement of each component and ensure the adaptability and effectiveness of the cleaning operation.

[0029] Furthermore, in combination Figures 1-6 The nozzle assembly 300 is oriented to the pre-set flushing area at the bottom of the cold end of the layered structure of the air preheater with the hot end on top and the cold end on the bottom. It is precisely adapted to the air preheater's reverse direction and the layered structure of the heat-receiving surface with the hot end on top and the cold end on the bottom. Its spray direction is precisely set along the reverse direction of the air preheater's rotor, and the spray path extends vertically along the layered structure of the heat-receiving surface from top to bottom, which matches the vertical spatial arrangement of the layered structure of the heat-receiving surface and meets the requirement of full coverage flushing of the heat-receiving surface from the cold end to the hot end.

[0030] Furthermore, the nozzle assembly 300 is arranged to extend radially along the air preheater rotor, with its spray end corresponding to the heated surface area of ​​the air preheater rotor and adapted to the rotor's reverse rotation trajectory. The nozzle assembly 300 preferably adopts a high-pressure fan-shaped nozzle to expand the flushing range, effectively avoid flushing blind spots, and improve the utilization rate of the flushing medium.

[0031] The fixing component 200 is arranged to fit the outline of the bottom soot blowing area of ​​the air preheater, thereby fixing the nozzle assembly 300 and the heated surface at a preset safe physical distance. This preset distance can effectively prevent structural interference between the nozzle assembly 300 and the rotor heated surface, while ensuring the jet pressure and effect of the flushing water flow.

[0032] Reference Figure 6 The fixing component 200 specifically includes a mounting housing 201, a fastening nut 202, and a flat washer 203. The mounting housing 201 is fixed to the preset base by the fastening nut 202 and the flat washer 203, providing stable support for the nozzle assembly 300 and ensuring that the nozzle assembly 300 is not offset in position and the spray direction is not deviated.

[0033] The high-pressure water circuit assembly 100 is oriented along the bottom support of the air preheater and consists of multiple high-pressure resistant pipelines. It is sealed and connected to the high-pressure cleaning water pump 403 through a flange-type high-pressure sealing structure to form a leak-free high-pressure water supply closed loop. The high-pressure cleaning water pump 403 is preferably an electric pressure testing pump, which can output high-pressure water flow adapted to the flushing requirements of the air preheater and meet the strong flushing requirements of the ash blockage area.

[0034] Combination Figure 1The high-pressure water circuit assembly 100 also integrates a filter to filter the flushing water and prevent impurities from clogging the nozzle assembly 300. The filter is preferably a 10μm high-pressure filter made of SUS304 material, which has high pressure resistance and corrosion resistance, and can effectively intercept solid impurities in the flushing water, ensuring the smooth spraying and service life of the nozzle assembly 300.

[0035] Furthermore, the cleaning device Q also includes a control component 400. The control component 400 is integrated into the local control cabinet of the air preheater and has a built-in control interface A with status display and parameter monitoring. The control component 400 is neatly arranged along the bottom support of the air preheater through a shielded wired signal cable, and establishes a stable bidirectional signal connection with the nozzle drive mechanism 401, the pressure detection component 402 and the high-pressure cleaning water pump 403 respectively. It also links the signals with the nozzle drive mechanism 401, the pressure detection component 402 and the high-pressure cleaning water pump 403 to achieve coordinated and precise control of the flushing action and pressure. The wired signal connection method can effectively avoid electromagnetic interference and ensure the stability and timeliness of signal transmission.

[0036] Specifically, the control component 400 has a built-in STM32F407 main control unit, integrating 4 analog signal acquisition modules to adapt to the signals of the pressure detection components; 6 digital signal output modules to drive the nozzle drive mechanism and water pump start and stop; and 2 communication interfaces, including MODBUS-RTU for communication with the DCS system and an Ethernet interface for local monitoring.

[0037] Specifically, the control component 400 outputs a spray angle adjustment control signal to the nozzle drive mechanism 401 to achieve precise fine-tuning of the nozzle spray direction, and outputs start / stop and pressure regulation control signals to the high-pressure cleaning water pump 403 to achieve real-time control of the pump's operating status and outlet water pressure. The pressure detection component 402 collects the high-pressure detection signal of the water circuit, and the nozzle drive mechanism 401 collects its own operating status signal, and both feed back to the control component 400 in real time. The monitoring parameters and equipment operating status are displayed synchronously in real time through the control interface A, forming a closed-loop signal linkage between command output and status feedback, thereby realizing automated and intelligent control of the cleaning process.

[0038] Furthermore, the control component 400 has a pre-stored cleaning sequence control program containing the full-process logic of "forward-rinse-backward-circulation". It supports pressure threshold setting, current overload protection and status alarm logic. The status alarm logic includes 8 types of fault alarms such as filter blockage, abnormal pressure, and nozzle jamming. When a fault occurs, it can immediately issue an alarm prompt and trigger corresponding protection actions to ensure the safe operation of the cleaning device.

[0039] Furthermore, the control panel of the 400 control component preferably adopts a 7-inch touch industrial display screen, which has a built-in control option area A1, mode switching area A2, start / stop control area A3 and operation status area A4. It supports red fault indicators, green completion indicators and real-time data curve display. Operators can intuitively view cleaning parameters and equipment status through the control interface A, and conveniently complete parameter setting, mode switching and start / stop operations, thus improving the ease of operation.

[0040] Furthermore, the control component 400 can directly link with the motor controller of the high-pressure cleaning water pump 403, the stepper motor driver of the nozzle drive mechanism, and the pressure detection component to achieve signal linkage without the need for additional adapter modules, simplifying the signal connection structure, reducing the equipment failure rate, and shortening the signal transmission path to improve the control response speed.

[0041] Furthermore, the nozzle assembly 300 is arranged to fully cover the easily clogged areas corresponding to the radial and axial seals of the air preheater, and the spray direction is adapted to the reverse direction of the air preheater rotor. This ensures that the flushing water flow acts vertically on the surface of the clogged area of ​​the air preheater's heating surface. The impact force of the vertical water flow maximizes the removal of the accumulated ash adhering to the heating surface, achieving precise and efficient flushing of the easily clogged areas and completely solving the problem of ash clogging at the radial and axial seals.

[0042] The high-pressure water circuit assembly 100 includes a 90° long-radius bend, which is fixed to the bottom support of the air preheater by U-bolts to ensure that the pipeline layout is stable and adapts to the water flow guidance requirements.

[0043] Furthermore, to complement the aforementioned arrangement method of the air preheater high-pressure cleaning device, this embodiment also provides a method for online high-pressure flushing of the air preheater, which employs the arrangement method of the air preheater high-pressure cleaning device and includes the following steps: Switch control modes via control interface A, refer to... Figure 7 The control interface A is divided into functional zones. When operating, first click "Manual Screen" at the bottom of the interface, select "Automatic" as the cleaning method in the control option area A1, and then set "Online / Offline" to "Online" mode through the mode switching area A2.

[0044] Start the water system. First, open the primary valve at the water pump inlet, then slightly open the secondary valve. After checking that there are no leaks in the pipeline, fully open the secondary valve. Then, open the manual valve at the flushing water gun inlet. Confirm that the initial flushing water pressure meets the standard through the operation status area A4 on the control interface A.

[0045] Start the high-pressure cleaning water pump 403. Monitor the current status through the operation status area A4 of the control interface A. Close the high-pressure unloading valve locally, gradually close the pressure regulating valve, and adjust the water pressure to the preset flushing pressure. Refer to... Figure 8On the sequential control interface, once the statuses "Cleaning device advances to the starting position" and "Open water inlet valve" turn green, the process is complete. The electric door at the inlet of the flushing water gun is opened on the spot, and the nozzle assembly 300 completes directional flushing according to the step-back trajectory, corresponding to the steps "Cleaning device advances to the step-back position" and "Cleaning device in step-back sequence" on the sequential control interface.

[0046] The system performs cyclic rinsing as needed. After one round of rinsing, the sequential control interface displays "Cleaning device retracts to the start position," and the nozzle assembly 300 automatically retracts. If a second round of rinsing is required, the start command on the sequential control interface is triggered again after an interval of 300 seconds to repeat the above directional rinsing steps.

[0047] Furthermore, after flushing is completed, the pressure relief status is monitored through the operation status area A4 of the control interface A. First, the high pressure unloading valve is fully opened, and then the pressure regulating valve is gradually opened to full opening. After confirming that the local pressure is 0MPa and the pressure displayed on the control interface A is ≤5bar, the corresponding "stop water inlet valve" status is displayed on the control interface, and finally the valve is shut off.

[0048] Reference Figure 7 The control interface A of the control component 400 includes a control option area A1, a mode switching area A2, a start / stop control area A3, and an operating status area A4.

[0049] The control option area A1 has several sets of option buttons for selecting and switching different functions; the mode switching area A2 includes DCS mode and local mode. DCS mode is a remote centralized control mode, and local mode is a field control mode.

[0050] The start / stop control area A3 includes a start program button and an end program button, used to control the start and stop of the cleaning device program. The operation status area A4 visually displays the running status of the currently selected program, specifically showing status indicators such as "Cleaning device forward to step-back position" and "Cleaning device step-back sequence in progress," as well as parameters such as flushing water pressure and water pump operating current. If an abnormality occurs, control interface A will pop up... Figure 9 If the alarm interface shown indicates a problem such as a clogged filter, you need to click "ACK" to confirm and resolve the issue.

[0051] Before switching control modes, perform insulation testing on the high-pressure cleaning water pump 403 and power it on. Check that the oil level and quality of the pump are up to standard, the oil level is at half full, the pump body is clean and there is no oil leakage, all pressure gauges are in normal operation, the motor is normal, the high-pressure water pipeline is leak-free and the connection is intact, there are no abnormal alarms on the control interface A, the nozzle assembly 300 is in the starting position, the cable wiring is normal and there is no grease leakage.

[0052] At the same time, ensure that the electric gate at the outlet of the thermal control forced flushing water pump is in the "open" state, ensure that maintenance personnel set up a support frame at the bottom of the air preheater ash discharge pipe, ensure that the ash discharge pipe is opened to discharge ash until negative pressure is seen in the ash discharge pipe, and notify the auxiliary control department and maintenance department personnel to arrive at the scene and prepare walkie-talkies and wrenches.

[0053] Furthermore, the initial flushing water pressure is ≥0.3MPa, the preset flushing pressure is 18~30MPa, and during the flushing process, the high-pressure cleaning water pump outlet pressure is monitored in real time between 25~30MPa through the operation status area A4 of control interface A. Figure 8 The pressure display after "Starting the Water Pump System" on the sequential control interface synchronously monitors the air preheater current, front and rear flue gas temperatures, air pressure, differential pressure, and unit drainage tank water level to ensure normal ash and water discharge from the air preheater ash hopper or normal negative pressure.

[0054] During the rinsing process, conduct on-site inspections every half hour, referring to... Figure 10 The process diagram shows that during inspection, the water output of the nozzle assembly 300 should be used to determine whether there is a blockage: if there is no blockage, continue cleaning; if there is a blockage, stop the machine for maintenance; every half hour, a comprehensive inspection of the flushing device should be carried out, and any leaks should be dealt with in a timely manner; at the same time, preparations should be made for cleaning the ground, and sludge should be cleaned up in a timely manner to avoid a large amount of sewage flowing into the ground; if the air preheater current or differential pressure is abnormally increased through the control interface A, an emergency shutdown should be performed immediately, which can be done through the "Emergency Stop" button on the control interface A or the local accident button.

[0055] After one rinse cycle, repeat the rinsing process at 300-second intervals as needed. After stopping the machine, follow these steps: Refer to... Figure 8 On the control interface, after confirming that the "cleaning device retreats to the stop position" status is green, click the "End Program" button on control interface A to stop the high-pressure cleaning water pump 403. If it cannot be stopped, the local emergency button can be used to stop it and the electric door of the flushing water gun inlet can be closed locally.

[0056] Furthermore, stop the cleaning device on control interface A. If there is no stopping condition, set the control mode to DCS control on the spot, close the manual door of the flushing water gun inlet, the primary door and the secondary door of the water pump inlet, observe that no sewage is discharged from the ash discharge pipe at the bottom of the air preheater within 10 minutes, close the ash discharge door, and finally cut off the power to the high-pressure cleaning water pump 403.

[0057] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A method for arranging a high-pressure cleaning device for an air preheater, characterized in that: The cleaning device (Q) includes a high-pressure water circuit assembly (100), a fixing assembly (200), and a nozzle assembly (300). The nozzle assembly (300) is oriented to a pre-set flushing area at the bottom of the cold end of the air preheater. Its spray direction is set along the reverse direction of the air preheater, and the spray path extends vertically from top to bottom along the layered structure of the heated surface, which matches the spatial arrangement of the layered structure of the heated surface. The fixing component (200) is arranged to fit the outline of the bottom soot blowing area of ​​the air preheater, so as to fix the nozzle component (300) and the heated surface of the air preheater at a preset distance; the high-pressure water circuit component (100) is oriented along the bottom support of the air preheater.

2. The arrangement method of the high-pressure cleaning device for the air preheater according to claim 1, characterized in that: The cleaning device (Q) also includes a control component (400), which is integrated into the local control cabinet of the air preheater. The control component (400) has a built-in control interface (A) with status display and parameter monitoring functions. The control component (400) establishes bidirectional signal connections with the nozzle drive mechanism (401), the pressure detection component (402), and the high-pressure cleaning water pump (403) via wired signal cables. The control component (400) outputs a spray angle adjustment control signal to the nozzle drive mechanism (401) and a start / stop and pressure adjustment control signal to the high-pressure cleaning water pump (403). The pressure detection component (402) feeds back the collected water circuit high-pressure detection signal and the nozzle drive mechanism (401) feeds back its own operating status signal to the control component (400). The monitoring parameters and operating status are displayed in real time through the control interface (A), forming a closed-loop signal linkage between command output and status feedback. The high-pressure water circuit assembly (100) is connected to the high-pressure cleaning water pump (403) through a high-pressure sealing structure to form a closed-loop water circuit for high-pressure water supply.

3. The arrangement method of the high-pressure cleaning device for the air preheater according to claim 1 or 2, characterized in that: The nozzle assembly (300) is arranged to fully cover the easily clogged areas corresponding to the radial and axial seals of the air preheater, and the flushing water flow of the nozzle assembly (300) acts perpendicularly on the surface of the clogged area of ​​the air preheater's heating surface.

4. The arrangement method of the high-pressure cleaning device for the air preheater according to claim 1 or 2, characterized in that: The fixing component (200) includes a mounting housing (201), a fastening nut (202), and a flat washer (203). The mounting housing (201) has nozzle mounting holes with uniform spacing, and the unused mounting holes are sealed by plugs (201a).

5. The arrangement method of the high-pressure cleaning device for the air preheater according to claim 1 or 2, characterized in that: The high-pressure water circuit assembly (100) includes a 90° long-radius bend, which is fixed to the bottom support of the air preheater by U-bolts.

6. A method for high-pressure online flushing of an air preheater, characterized in that: The arrangement method of the high-pressure cleaning device for the air preheater includes the following steps: Switch control modes via the control interface (A); Start the water system and confirm that the initial flushing water pressure meets the standard through the control interface (A); Start the high-pressure cleaning water pump (403), monitor the current status through the control interface (A), adjust the water pressure to the preset flushing pressure, and the nozzle assembly completes directional flushing in a step-back trajectory; Flushing is performed on demand. After flushing is completed, the pressure relief status is monitored through the control interface (A). The valve is shut off when the pressure is normal.

7. The high-pressure online flushing method for air preheaters according to claim 6, characterized in that: The control interface (A) of the control component (400) includes a control option area (A1), a mode switching area (A2), a start / stop control area (A3), and an operating status area (A4). The control option area (A1) is equipped with several sets of option buttons for selecting and switching different functions; the mode switching area (A2) includes DCS mode and local mode, wherein DCS mode is a remote centralized control mode and local mode is a field control mode. The start / stop control area (A3) includes a start program button and an end program button, which are used to control the start and stop of the cleaning device program. The operation status area (A4) intuitively displays the operation status of the currently selected program.

8. The high-pressure online flushing method for air preheaters according to claim 7, characterized in that: Before switching control modes, perform insulation testing on the high-pressure cleaning water pump (403) and power it on. Check that the oil level and quality of the water pump meet the standards. Set up a support on the ash discharge pipe at the bottom of the air preheater and complete the ash discharge operation until the ash discharge pipe forms a negative pressure.

9. The high-pressure online flushing method for an air preheater according to claim 7 or 8, characterized in that: The initial flushing water pressure is ≥0.3MPa, the preset flushing pressure is 18~30MPa, and the high-pressure cleaning water pump outlet pressure is monitored in real time between 25~30MPa through the control interface (A) during the flushing process.

10. The air preheater high-pressure online flushing method according to claim 9, characterized in that: During the flushing process, an on-site inspection is carried out every half hour to confirm that the nozzle assembly (300) is not stuck. If the air preheater current or differential pressure is abnormally increased through the control interface (A), the machine is immediately shut down. After one round of rinsing, repeat the rinsing process every 300 seconds as needed. After stopping the machine, observe the bottom ash discharge pipe of the air preheater for 10 minutes to ensure that no sewage is discharged before closing the ash discharge door.

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