Automatic cleaning system and method for heat exchanger

Abstract

The invention discloses an automatic cleaning system and method for a heat exchanger, and the automatic cleaning system comprises a circulating water tank, a differential pressure sensor, a circulating water pump, a cleaning fluid conveying pipe, a cleaning fluid return pipe, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a first controller, a second controller and a third controller. The differential pressure sensor is connected with the cold water inlet pipe and the cooling water outlet pipe, a water inlet of the circulating water pump is communicated with the bottom of the circulating water tank, one end of the cleaning liquid conveying pipe is communicated with a water outlet of the circulating water pump, and the other end of the cleaning liquid conveying pipe is communicated with the cooling water inlet pipe. The first electromagnetic valve and the second electromagnetic valve are arranged on the cold water inlet pipe and the cooling water outlet pipe respectively, and the third electromagnetic valve and the fourth electromagnetic valve are arranged on the cleaning liquid conveying pipe and the cleaning liquid return pipe respectively. According to the technical scheme, automatic circulating cleaning of the heat exchanger can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchanger cleaning, in particular to an automatic cleaning system and method for the internal heat exchanger of a water-cooled screw air compressor and a refrigeration dryer. BACKGROUND

[0002] During the operation of a water-cooled screw air compressor and a refrigeration dryer, the inner wall of the heat exchange pipeline of the internal heat exchanger is prone to scale, algae or impurities. These contaminants can significantly reduce heat exchange efficiency, leading to increased exhaust temperature and energy consumption, and in severe cases, even causing overheating alarms or shutdown, affecting the continuity and stability of production.

[0003] Currently, the cleaning and maintenance of such heat exchangers generally use the traditional method of disassembly and cleaning. This method requires the heat exchanger to be completely disassembled from the main machine, and cleaned by physical brushing or chemical soaking. This operation method has many drawbacks: first, the disassembly process is tedious, requiring a lot of manpower and time, resulting in a decrease in the effective operation rate of the equipment; second, frequent disassembly can damage the sealing components, affecting the original sealing performance of the equipment and causing leakage risks; third, the entire cleaning process relies on human experience, with uneven cleaning results and potential chemical cleaning waste liquid disposal problems. In addition, some attempts at online flushing methods often have single functions, only capable of simple water circulation, and cannot achieve automatic cleaning agent proportioning, process parameter precise control and automatic waste liquid discharge, with limited cleaning effect and difficulty in completely removing stubborn dirt. SUMMARY

[0004] The main purpose of the present application is to provide an automatic heat exchanger cleaning system and method, aiming to solve the problems mentioned in the background.

[0005] To achieve the above objectives, the present invention proposes an automatic heat exchanger cleaning system for a water-cooled screw air compressor. The water-cooled screw air compressor includes a heat exchanger, a main compressor motor, a cold water inlet pipe, and a cooling water outlet pipe. The front ends of the cold water inlet pipe and the cooling water outlet pipe are respectively connected to the cooling water inlet and outlet of the heat exchanger, and the rear ends of the cold water inlet pipe and the cooling water outlet pipe are respectively connected to a cooling water delivery pump and a cooling water recovery tank. The automatic heat exchanger cleaning system includes a circulating water tank, a differential pressure sensor, a circulating water pump, a cleaning fluid delivery pipe, a cleaning fluid return pipe, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a first controller, a second controller, and a third controller. The differential pressure sensor is connected to both the cold water inlet pipe and the cooling water outlet pipe, and is used to detect the pressure difference between the cold water inlet pipe and the cooling water outlet pipe in real time. The inlet of the circulating water pump is connected to the bottom of the circulating water tank. One end of the cleaning fluid delivery pipe is connected to the outlet of the circulating water pump, and the other end is connected to the cooling water inlet pipe. One end of the cleaning fluid return pipe is connected to the cooling water outlet pipe, and the other end is connected to the top of the circulating water tank. The first and second solenoid valves are respectively installed on the cold water inlet pipe and the cooling water outlet pipe, and are both located above the connection points of the cold water inlet pipe and the cooling water outlet pipe with the cleaning fluid delivery pipe and the cleaning fluid return pipe. The third and fourth solenoid valves are respectively installed on the cleaning fluid delivery pipe and the cleaning fluid return pipe. The air compressor, differential pressure sensor, circulating water pump, first solenoid valve, second solenoid valve, third solenoid valve, and fourth solenoid valve are all electrically connected to the first controller. The first and second controllers are respectively electrically connected to the third controller. The third controller is equipped with a touch screen and a communication module. The third controller is connected to the backend cloud management platform through the communication module.

[0006] Optionally, it also includes a water supply pipe, a fifth solenoid valve, and a liquid level sensor. One end of the water supply pipe is connected to the rear end of the cold water inlet pipe, and the other end of the water supply pipe is connected to the upper end of the circulating water tank. The fifth solenoid valve is mounted on the water supply pipe. The two ends of the liquid level sensor are connected to the upper and lower ends of the circulating water tank, respectively. The liquid level sensor is used to monitor the liquid level in the circulating water tank in real time. The fifth solenoid valve and the liquid level sensor are electrically connected to the second controller.

[0007] Optionally, the system also includes a multi-parameter water quality analyzer, a dosing pipe, and a sixth solenoid valve. The multi-parameter water quality analyzer is installed inside the circulating water tank and is used to detect the water quality parameters in the circulating water tank in real time. One end of the dosing pipe is connected to the upper end of the circulating water tank, and the other end of the dosing pipe is connected to the dosing tank. The sixth solenoid valve is installed on the dosing pipe. The multi-parameter water quality analyzer and the sixth solenoid valve are electrically connected to the second controller.

[0008] Optionally, the system also includes a conductivity meter, a drain pipe, and a seventh solenoid valve. The conductivity meter is connected to the circulating water tank, one end of the drain pipe is connected to the cooling water outlet pipe, and the other end of the drain pipe is connected to the sewage recovery tank. The seventh solenoid valve is mounted on the drain pipe, and the conductivity meter and the seventh solenoid valve are electrically connected to the second controller.

[0009] Optionally, it also includes a pressure sensor, a pressure relief pipe, and a manual pressure regulating valve. The pressure sensor is installed on the cleaning fluid delivery pipe, one end of the pressure relief pipe is connected to the cleaning fluid delivery pipe, and the other end is connected to the upper end of the circulating water tank. The manual pressure regulating valve is installed on the pressure relief pipe.

[0010] Optionally, it also includes a manual drain valve, wherein a drain port is provided at the lower end of the circulating water tank, and the manual drain valve is located at the front end of the drain port.

[0011] Optionally, both the cleaning fluid delivery pipe and the cleaning fluid return pipe are equipped with manual regulating valves.

[0012] On the other hand, the present invention also proposes an automatic heat exchanger cleaning method, which uses the above-mentioned automatic heat exchanger cleaning system and includes the following steps:

[0013] The first controller controls the opening of the first and second solenoid valves, and the closing of the third and fourth solenoid valves. At this time, the air compressor operates normally. The heat inside the heat exchanger is carried away by the circulation of cold water inlet pipe and cooling water outlet pipe to achieve cooling. The operating parameters are set through the touch screen of the third controller. The pressure difference between the cold water inlet pipe and the cooling water outlet pipe is detected in real time by a differential pressure sensor, and the data is uploaded to the first controller. When the pressure difference detected by the differential pressure sensor exceeds the set value, it indicates that scaling and blockage have occurred in the condenser tubes inside the heat exchanger, and the cleaning process is initiated. The first controller sends a command to the air compressor, the main motor of the air compressor stops running, and at the same time controls the first and second solenoid valves to close, the third and fourth solenoid valves to open, and the circulating water pump starts. The cleaning fluid in the circulating water tank is sent into the cooling interior through the cleaning fluid delivery pipe to dissolve and clean the scaling. The cleaning fluid is then returned to the circulating water tank through the cleaning fluid return pipe, realizing the automatic circulation cleaning of the heat exchanger. The liquid level in the circulating water tank is monitored in real time by a liquid level sensor. When the liquid level sensor detects that the liquid level in the circulating water tank is lower than the preset value, the fifth solenoid valve opens to introduce cooling water from the cold water inlet pipe into the circulating water tank. When the liquid level sensor detects that the liquid level in the circulating water tank is higher than the preset value, the fifth solenoid valve closes to realize automatic water replenishment of the circulating water tank. The water quality parameters in the circulating water tank are monitored in real time by a multi-parameter water quality analyzer. When the measured value of the multi-parameter water quality analyzer exceeds the set value, it indicates that the water quality in the circulating water tank does not meet the standard. The sixth solenoid valve is opened, and the chemical solution in the chemical dosing tank is added to the circulating water tank through the chemical dosing pipe. When the water quality parameter is lower than the preset value, the sixth solenoid valve is closed to stop the chemical dosing, thus realizing the automatic chemical dosing of the circulating water tank. The conductivity of the circulating water tank is detected in real time by a conductivity meter. When the detected value exceeds the set value, the surface of the circulating water tank becomes turbid, the seventh solenoid valve opens, and sewage is discharged through the drain pipe. When the detected value is lower than the set value, the seventh solenoid valve closes and the sewage discharge stops, thus realizing the automatic sewage discharge of the circulating water tank. When the pressure difference detected by the differential pressure sensor is lower than the set value, the third and fourth solenoid valves and the circulating water pump are closed to stop cleaning, the first and second solenoid valves are opened, and the air compressor main motor is powered on to enter standby mode.

[0014] The technical solution of this invention has the following beneficial effects: This invention enables online cleaning of heat exchangers without disassembly, completely avoiding the necessary equipment disassembly process of traditional methods. This not only significantly shortens maintenance time, reducing what might have been several days of downtime for repairs to an automated process of several hours, greatly improving equipment availability and production continuity, but also fundamentally eliminates secondary risks such as seal damage and media leakage that may result from frequent disassembly and assembly, ensuring the safety of the equipment itself. Through an integrated automatic control system, the cleaning process is made precise and standardized. The system can isolate itself from the original circulating water pipes and automatically perform a series of actions such as pump start-up, water replenishment, chemical dosing, and sewage discharge, ensuring the consistency and thoroughness of the cleaning effect and overcoming the instability of manual operation. At the same time, automated operation reduces reliance on the professional skills and experience of operators, simplifies the operation process, reduces the risk of personnel exposure to chemical agents, and improves operational safety. At the same time, it brings significant economic benefits. On the one hand, it directly saves a lot of labor and time costs required for disassembly and assembly; on the other hand, through regular and efficient automatic cleaning, it can maintain the best heat exchange efficiency of the heat exchanger for a long time, thereby reducing the operating energy consumption of the air compressor and dryer, realizing the transformation from "periodic overhaul" to "routine maintenance" preventive maintenance mode, and the overall maintenance cost is greatly reduced. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of an automatic heat exchanger cleaning system according to an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of an automatic heat exchanger cleaning system according to an embodiment of the present invention.

[0017] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0021] This invention proposes an automatic cleaning system and method for heat exchangers.

[0022] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the automatic heat exchanger cleaning system is used in a water-cooled screw air compressor. The water-cooled screw air compressor 100 includes a heat exchanger 101, a main air compressor motor 102, a cold water inlet pipe 103, and a cooling water outlet pipe 104. The front ends of the cold water inlet pipe 103 and the cooling water outlet pipe 104 are respectively connected to the cooling water inlet and cooling water outlet of the heat exchanger 101, and the rear ends of the cold water inlet pipe 103 and the cooling water outlet pipe 104 are respectively connected to a cooling water delivery pump and a cooling water recovery tank. The automatic heat exchanger cleaning system includes a circulating water tank 2. 01. Differential pressure sensor 202, circulating water pump 203, cleaning fluid delivery pipe 204, cleaning fluid return pipe 205, first solenoid valve 206, second solenoid valve 207, third solenoid valve 208, fourth solenoid valve 209, first controller 210, second controller 211, and third controller 212. The differential pressure sensor 202 is connected to the cold water inlet pipe 103 and the cooling water outlet pipe 104 respectively. The differential pressure sensor 202 is used to detect the pressure difference between the cold water inlet pipe 103 and the cooling water outlet pipe 104 in real time. The inlet of the circulating water pump 203 is connected to the circulating water tank 20. The bottom of the 1 is connected. One end of the cleaning fluid delivery pipe 204 is connected to the outlet of the circulating water pump 203, and the other end is connected to the cooling water inlet pipe 103. One end of the cleaning fluid return pipe 205 is connected to the cooling water outlet pipe 104, and the other end is connected to the top of the circulating water tank 201. The first solenoid valve 206 and the second solenoid valve 207 are respectively installed on the cold water inlet pipe 103 and the cooling water outlet pipe 104, and are both located above the connection between the cold water inlet pipe 103 and the cooling water outlet pipe 104 and the cleaning fluid delivery pipe 204 and the cleaning fluid return pipe 205. The third solenoid valve 206 is connected to the bottom of the 104. The cleaning fluid delivery pipe 204 is connected to the outlet of the circulating water pump 203, and the other end is connected to the cooling water inlet pipe 103. The cleaning fluid return pipe 205 is connected to the top of the circulating water tank 201. The first solenoid valve 206 and the second solenoid valve 207 are respectively installed on the cold water inlet pipe 103 and the cooling water outlet pipe 104, and are located above the connection between the cold water inlet pipe 103 and the cooling water outlet pipe 104 and the cleaning fluid delivery pipe 204 and the cleaning fluid return pipe 205. 08 and the fourth solenoid valve 209 are respectively installed on the cleaning fluid delivery pipe 204 and the cleaning fluid return pipe 205. The air compressor 102, differential pressure sensor 202, circulating water pump 203, first solenoid valve 206, second solenoid valve 207, third solenoid valve 208 and fourth solenoid valve 209 are all electrically connected to the first controller 210. The first controller 210 and the second controller 211 are respectively electrically connected to the third controller 212. The third controller 212 is equipped with a touch screen and a communication module. The third controller 212 is connected to the back-end cloud management platform through the communication module.

[0023] Optionally, it also includes a water supply pipe 213, a fifth solenoid valve 214, and a liquid level sensor 215. One end of the water supply pipe 213 is connected to the rear end of the cold water inlet pipe 103, and the other end of the water supply pipe 213 is connected to the upper end of the circulating water tank 201. The fifth solenoid valve 214 is installed on the water supply pipe 213. The two ends of the liquid level sensor 215 are connected to the upper end and the lower end of the circulating water tank 201, respectively. The liquid level sensor 215 is used to monitor the liquid level in the circulating water tank 201 in real time. The fifth solenoid valve 214 and the liquid level sensor 215 are electrically connected to the second controller 212.

[0024] Optionally, it also includes a multi-parameter water quality analyzer 216, a dosing pipe 217, and a sixth solenoid valve 218. The multi-parameter water quality analyzer 216 is installed in the circulating water tank 201 and is used to detect the water quality parameters in the circulating water tank 201 in real time. One end of the dosing pipe 217 is connected to the upper end of the circulating water tank 201, and the other end of the dosing pipe 217 is connected to the dosing tank. The sixth solenoid valve 218 is installed on the dosing pipe 217. The multi-parameter water quality analyzer 216 and the sixth solenoid valve 218 are electrically connected to the second controller 212.

[0025] Optionally, it also includes a conductivity meter 219, a drain pipe 220, and a seventh solenoid valve 221. The conductivity meter 219 is connected to the circulating water tank 201. One end of the drain pipe 220 is connected to the cooling water outlet pipe 104, and the other end of the drain pipe 220 is connected to the sewage recovery tank. The seventh solenoid valve 221 is installed on the drain pipe 220. The conductivity meter 219 and the seventh solenoid valve 221 are electrically connected to the second controller 212, respectively.

[0026] Optionally, the system also includes a pressure sensor 222, a pressure relief pipe 223, and a manual pressure regulating valve 224. The pressure sensor 222 is installed on the cleaning fluid delivery pipe 204. One end of the pressure relief pipe 223 is connected to the cleaning fluid delivery pipe 204, and the other end is connected to the upper end of the circulating water tank 201. The manual pressure regulating valve 224 is installed on the pressure relief pipe 223. The cleaning fluid delivery pipe can be adjusted to a suitable size by manually regulating the pressure valve to avoid excessive or insufficient pressure affecting the stable operation of the system and improve the safety of the system.

[0027] Optionally, a manual drain valve 225 is also included. A drain port 226 is provided at the lower end of the circulating water tank 201, and the manual drain valve 225 is located at the front end of the drain port 226. This facilitates manual opening of the valve to clean and drain the circulating water tank.

[0028] Optionally, both the cleaning fluid delivery pipe 204 and the cleaning fluid return pipe 205 are equipped with manual regulating valves, which facilitates manual opening and closing of the valves in case of solenoid valve failure, thereby improving the safety of the system.

[0029] On the other hand, the present invention also proposes an automatic heat exchanger cleaning method, which uses the above-mentioned automatic heat exchanger cleaning system and includes the following steps: The first controller controls the opening of the first and second solenoid valves, and the closing of the third and fourth solenoid valves. At this time, the air compressor operates normally. The heat inside the heat exchanger is carried away by the circulation of cold water inlet pipe and cooling water outlet pipe to achieve cooling. The operating parameters are set through the touch screen of the third controller. The pressure difference between the cold water inlet pipe and the cooling water outlet pipe is detected in real time by a differential pressure sensor, and the data is uploaded to the first controller. When the pressure difference detected by the differential pressure sensor exceeds the set value, it indicates that scaling and blockage have occurred in the condenser tubes inside the heat exchanger, and the cleaning process is initiated. The first controller sends a command to the air compressor, the main motor of the air compressor stops running, and at the same time controls the first and second solenoid valves to close, the third and fourth solenoid valves to open, and the circulating water pump starts. The cleaning fluid in the circulating water tank is sent into the cooling interior through the cleaning fluid delivery pipe to dissolve and clean the scaling. The cleaning fluid is then returned to the circulating water tank through the cleaning fluid return pipe, realizing the automatic circulation cleaning of the heat exchanger. The liquid level in the circulating water tank is monitored in real time by a liquid level sensor. When the liquid level sensor detects that the liquid level in the circulating water tank is lower than the preset value, the fifth solenoid valve opens to introduce cooling water from the cold water inlet pipe into the circulating water tank. When the liquid level sensor detects that the liquid level in the circulating water tank is higher than the preset value, the fifth solenoid valve closes to realize automatic water replenishment of the circulating water tank. The water quality parameters in the circulating water tank are monitored in real time by a multi-parameter water quality analyzer. When the measured value of the multi-parameter water quality analyzer exceeds the set value, it indicates that the water quality in the circulating water tank does not meet the standard. The sixth solenoid valve is opened, and the chemical solution in the chemical dosing tank is added to the circulating water tank through the chemical dosing pipe. When the water quality parameter is lower than the preset value, the sixth solenoid valve is closed to stop the chemical dosing, thus realizing the automatic chemical dosing of the circulating water tank. The conductivity of the circulating water tank is detected in real time by a conductivity meter. When the detected value exceeds the set value, the surface of the circulating water tank becomes turbid, the seventh solenoid valve opens, and sewage is discharged through the drain pipe. When the detected value is lower than the set value, the seventh solenoid valve closes and the sewage discharge stops, thus realizing the automatic sewage discharge of the circulating water tank. When the pressure difference detected by the differential pressure sensor is lower than the set value, the third and fourth solenoid valves and the circulating water pump are closed to stop cleaning, the first and second solenoid valves are opened, and the air compressor main motor is powered on to enter standby mode.

[0030] The technical solution of the present invention has the following advantages: 1. It enables online cleaning of heat exchangers without disassembly, completely eliminating the equipment disassembly process required by traditional methods. This not only significantly shortens maintenance time, reducing what might have been several days of downtime for maintenance to an automated process of several hours, greatly improving equipment availability and production continuity, but also fundamentally eliminates secondary risks such as seal damage and media leakage that may result from frequent disassembly and assembly, ensuring the safety of the equipment itself; 2. Through an integrated automatic control system, the cleaning process is made precise and standardized. The system can isolate itself from the original circulating water pipes and automatically perform a series of actions such as pump start-up, water replenishment, chemical dosing, and sewage discharge, ensuring the consistency and thoroughness of the cleaning effect and overcoming the instability of manual operation. At the same time, automated operation reduces reliance on the professional skills and experience of operators, simplifies the operation process, reduces the risk of personnel exposure to chemical agents, and improves operational safety. 3. At the same time, it brings significant economic benefits. On the one hand, it directly saves a lot of labor and time costs required for disassembly and assembly; on the other hand, through regular and efficient automatic cleaning, it can maintain the best heat exchange efficiency of the heat exchanger for a long time, thereby reducing the operating energy consumption of the air compressor and dryer, realizing the transformation from "periodic overhaul" to "routine maintenance" preventive maintenance mode, and the overall maintenance cost is greatly reduced.

[0031] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An automatic heat exchanger cleaning system for a water-cooled screw air compressor, the water-cooled screw air compressor comprising a heat exchanger, a main air compressor motor, a cold water inlet pipe, and a cooling water outlet pipe, wherein the front ends of the cold water inlet pipe and the cooling water outlet pipe are respectively connected to the cooling water inlet and the cooling water outlet of the heat exchanger, and the rear ends of the cold water inlet pipe and the cooling water outlet pipe are respectively connected to a cooling water delivery pump and a cooling water recovery tank, characterized in that... The automatic cleaning system for the heat exchanger includes a circulating water tank, a differential pressure sensor, a circulating water pump, a cleaning fluid delivery pipe, a cleaning fluid return pipe, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a first controller, a second controller, and a third controller. The differential pressure sensor is connected to both the cold water inlet pipe and the cooling water outlet pipe, and is used to detect the pressure difference between them in real time. The inlet of the circulating water pump is connected to the bottom of the circulating water tank. One end of the cleaning fluid delivery pipe is connected to the outlet of the circulating water pump, and the other end is connected to the cooling water inlet pipe. One end of the cleaning fluid return pipe is connected to the cooling water outlet pipe, and the other end is connected to the top of the circulating water tank. The components are connected. The first and second solenoid valves are respectively installed on the cold water inlet pipe and the cooling water outlet pipe, and are both located above the connection points of the cold water inlet pipe and the cooling water outlet pipe with the cleaning fluid delivery pipe and the cleaning fluid return pipe. The third and fourth solenoid valves are respectively installed on the cleaning fluid delivery pipe and the cleaning fluid return pipe. The air compressor, differential pressure sensor, circulating water pump, first solenoid valve, second solenoid valve, third solenoid valve, and fourth solenoid valve are all electrically connected to the first controller. The first controller and the second controller are respectively electrically connected to the third controller. The third controller is equipped with a touch screen and a communication module. The third controller is connected to the backend cloud management platform through the communication module.

2. The automatic heat exchanger cleaning system according to claim 1, characterized in that, It also includes a water supply pipe, a fifth solenoid valve, and a liquid level sensor. One end of the water supply pipe is connected to the rear end of the cold water inlet pipe, and the other end of the water supply pipe is connected to the upper end of the circulating water tank. The fifth solenoid valve is installed on the water supply pipe. The two ends of the liquid level sensor are connected to the upper and lower ends of the circulating water tank, respectively. The liquid level sensor is used to monitor the liquid level in the circulating water tank in real time. The fifth solenoid valve and the liquid level sensor are electrically connected to the second controller.

3. The automatic heat exchanger cleaning system according to claim 1, characterized in that, It also includes a multi-parameter water quality analyzer, a dosing pipe, and a sixth solenoid valve. The multi-parameter water quality analyzer is installed inside the circulating water tank and is used to detect the water quality parameters in the circulating water tank in real time. One end of the dosing pipe is connected to the upper end of the circulating water tank, and the other end of the dosing pipe is connected to the dosing tank. The sixth solenoid valve is installed on the dosing pipe. The multi-parameter water quality analyzer and the sixth solenoid valve are electrically connected to the second controller.

4. The automatic heat exchanger cleaning system according to claim 1, characterized in that, It also includes a conductivity meter, a drain pipe, and a seventh solenoid valve. The conductivity meter is connected to the circulating water tank. One end of the drain pipe is connected to the cooling water outlet pipe, and the other end of the drain pipe is connected to the sewage recovery tank. The seventh solenoid valve is installed on the drain pipe. The conductivity meter and the seventh solenoid valve are electrically connected to the second controller.

5. The automatic heat exchanger cleaning system according to claim 1, characterized in that, It also includes a pressure sensor, a pressure relief pipe, and a manual pressure regulating valve. The pressure sensor is installed on the cleaning fluid delivery pipe. One end of the pressure relief pipe is connected to the cleaning fluid delivery pipe, and the other end is connected to the upper end of the circulating water tank. The manual pressure regulating valve is installed on the pressure relief pipe.

6. The automatic heat exchanger cleaning system according to claim 1, characterized in that, It also includes a manual drain valve, and the lower end of the circulating water tank is provided with a drain port, and the manual drain valve is located at the front end of the drain port.

7. The automatic heat exchanger cleaning system according to claim 1, characterized in that, Both the cleaning fluid delivery pipe and the cleaning fluid return pipe are equipped with manual regulating valves.

8. The automatic cleaning method for a heat exchanger in an automatic heat exchanger cleaning system according to any one of claims 1 to 7, characterized in that, The automatic cleaning method for the heat exchanger includes the following steps: The first controller controls the opening of the first and second solenoid valves, and the closing of the third and fourth solenoid valves. At this time, the air compressor operates normally. The heat inside the heat exchanger is carried away by the circulation of cold water inlet pipe and cooling water outlet pipe to achieve cooling. The operating parameters are set through the touch screen of the third controller. The pressure difference between the cold water inlet pipe and the cooling water outlet pipe is detected in real time by a differential pressure sensor, and the data is uploaded to the first controller. When the pressure difference detected by the differential pressure sensor exceeds the set value, it indicates that scaling and blockage have occurred in the condenser tubes inside the heat exchanger, and the cleaning process is initiated. The first controller sends a command to the air compressor, the main motor of the air compressor stops running, and at the same time controls the first and second solenoid valves to close, the third and fourth solenoid valves to open, and the circulating water pump starts. The cleaning fluid in the circulating water tank is sent into the cooling interior through the cleaning fluid delivery pipe to dissolve and clean the scaling. The cleaning fluid is then returned to the circulating water tank through the cleaning fluid return pipe, realizing the automatic circulation cleaning of the heat exchanger. The liquid level in the circulating water tank is monitored in real time by a liquid level sensor. When the liquid level sensor detects that the liquid level in the circulating water tank is lower than the preset value, the fifth solenoid valve opens to introduce cooling water from the cold water inlet pipe into the circulating water tank. When the liquid level sensor detects that the liquid level in the circulating water tank is higher than the preset value, the fifth solenoid valve closes to realize automatic water replenishment of the circulating water tank. The water quality parameters in the circulating water tank are monitored in real time by a multi-parameter water quality analyzer. When the measured value of the multi-parameter water quality analyzer exceeds the set value, it indicates that the water quality in the circulating water tank does not meet the standard. The sixth solenoid valve is opened, and the chemical solution in the chemical dosing tank is added to the circulating water tank through the chemical dosing pipe. When the water quality parameter is lower than the preset value, the sixth solenoid valve is closed to stop the chemical dosing, thus realizing the automatic chemical dosing of the circulating water tank. The conductivity of the circulating water tank is detected in real time by a conductivity meter. When the detected value exceeds the set value, the surface of the circulating water tank becomes turbid, the seventh solenoid valve opens, and sewage is discharged through the drain pipe. When the detected value is lower than the set value, the seventh solenoid valve closes and the sewage discharge stops, thus realizing the automatic sewage discharge of the circulating water tank. When the pressure difference detected by the differential pressure sensor is lower than the set value, the third and fourth solenoid valves and the circulating water pump are closed to stop cleaning, the first and second solenoid valves are opened, and the air compressor main motor is powered on to enter standby mode.

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