Anode protection acid cooler with automatic flushing function and method of use thereof

Abstract

The application discloses an anode protection acid cooler with an automatic flushing function and a use method thereof, and the anode protection acid cooler with the automatic flushing function comprises the anode protection acid cooler, a first communication pipeline is arranged at an acid outlet of the anode protection acid cooler, the first communication pipeline is respectively connected with an acid discharging assembly, a pressure supplying assembly and a flushing assembly, and the other end of the flushing assembly is connected with an acid inlet of the anode protection acid cooler in communication. Through cooperation between the components, the application can solve the problem that the acid channel of the existing anode protection acid cooler is prone to scale formation and blockage, prevent the problems of poor heat exchange effect and difficult cleaning caused by the acid channel blockage, effectively prolong the service life of the anode protection acid cooler, prevent the system from stopping production caused by the serious acid channel blockage of the anode protection acid cooler, reduce the system operation cost, improve the production capacity, and prevent the equipment from being corroded intensively caused by the increased production energy consumption and over-temperature.

Description

Technical Field

[0001] This invention relates to the field of concentrated sulfuric acid heat exchange and cooling technology, and in particular to an anodic protective acid cooler with automatic flushing function and its usage method. Background Technology

[0002] As smelting enterprises increasingly use high-impurity raw materials in sulfuric acid production from smelting flue gas, the anode protection acid cooling unit in the dry absorption section of the sulfuric acid system is gradually experiencing problems such as scaling and blockage in the acid path. This leads to poor heat exchange efficiency and difficulty in cleaning the heat exchanger. Currently, there is no cleaning device specifically for the anode protection acid cooler, and severe scaling and blockage in the acid path can cause system shutdowns and require replacement with a new anode protection acid cooler, increasing costs. Therefore, in view of the current situation, there is a need for a device that can flush the acid path of the anode protection acid cooler to solve the problems of poor heat exchange efficiency and difficulty in cleaning caused by scaling and blockage in the acid path. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by providing an anodic protective acid cooler with an automatic flushing function and its usage method. It solves the problem of scaling and clogging in the acid path of existing anodic protective acid coolers, preventing poor heat exchange and difficulty in cleaning caused by acid path blockage. It can effectively increase the service life of the anodic protective acid cooler, prevent system shutdown due to severe acid path blockage, reduce system operating costs, increase production capacity, and prevent the equipment from experiencing accelerated corrosion due to increased production energy consumption or overheating.

[0004] The technical solution adopted to achieve the above objectives is: An anolyte protective acid cooler with an automatic flushing function includes an anolyte protective acid cooler, characterized in that a first connecting pipe is provided at the acid outlet of the anolyte protective acid cooler, the first connecting pipe being connected to an acid discharge component, a pressure supply component, and a flushing component, the other end of the flushing component being connected to the acid inlet of the anolyte protective acid cooler, the acid discharge component preferentially discharging the acid remaining inside the anolyte protective acid cooler, the flushing component repeatedly flushing and descaling the inside of the anolyte protective acid cooler, and the pressure supply component ensuring that the flushing liquid inside the anolyte protective acid cooler reacts fully.

[0005] Furthermore, a pressure balancing valve is provided at the acid inlet of the anode protective acid cooler, and a hydrogen alarm is provided on one side of the pressure balancing valve.

[0006] Furthermore, the first connecting pipe is a four-way stainless steel pipe, and the four outlets of the connecting pipe are respectively equipped with a first valve, a second valve, a third valve and a fourth valve. The other end of the first valve is connected to the acid outlet of the anodic protection acid cooler, and a flow meter is provided on one side of the first valve in the first connecting pipe. The other end of the second valve is connected to the pressure supply component, the other end of the third valve is connected to the flushing component, and the other end of the fourth valve is connected to the acid discharge component.

[0007] Furthermore, the pressure supply assembly includes an air tank and a compressed air source, and the connection sequence between the air tank, the compressed air source, and the second valve is the second valve, the air tank, and the compressed air source, respectively.

[0008] Furthermore, the flushing assembly includes a second connecting pipe, a flushing fluid storage tank, a circulation pump, a third connecting pipe, and a waste liquid storage tank. The second connecting pipe is connected to a third valve, the third connecting pipe is connected to the waste liquid storage tank, and a fifth valve is provided between the third connecting pipe and the waste liquid storage tank. The third connecting pipe is connected to the acid inlet of the anolyte protective acid cooler, and a sixth valve is provided between the third connecting pipe and the anolyte protective acid cooler. The flushing fluid storage tank is connected to the acid inlet of the anolyte protective acid cooler in sequence through the second connecting pipe, the circulation pump, and the third connecting pipe, and a seventh valve is provided between the second connecting pipe and the flushing fluid storage tank.

[0009] Furthermore, the second connecting pipe is a three-way stainless steel pipe, and the three outlets of the second connecting pipe are respectively connected to the third valve, the circulating pump and the flushing liquid storage tank. The third connecting pipe is a three-way stainless steel pipe, and the three outlets of the third connecting pipe are respectively connected to the circulating pump, the waste liquid storage tank and the acid inlet of the anode protection acid cooler.

[0010] Furthermore, a pH meter and a temperature meter are provided at the connection between the third connecting pipe and the circulating pump, and both the pH meter and the temperature meter are connected to the third connecting pipe.

[0011] Furthermore, the acid release assembly includes an underground sulfuric acid tank, which is connected to a fourth valve.

[0012] Furthermore, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, and the seventh valve are all fluoropolymer-lined butterfly valves.

[0013] This invention also discloses a method for using an anolyte cooler with an automatic flushing function, comprising the following steps: Step A: Open the first valve, the fourth valve, and the pressure balancing valve, and close the other valves. This allows the residual acid inside the anolyte protection acid cooler to pass through the acid outlet, the first valve, the first connecting pipe, and the fourth valve in sequence, and enter the sulfuric acid underground tank to complete the acid discharge operation. The flow meter is used to monitor the process. Step B: Based on step A, close the fourth valve and the first valve, open the seventh valve and the sixth valve, and start the circulation pump. The circulation pump drives the flushing liquid in the flushing liquid storage tank to pass through the seventh valve, the circulation pump, the third connecting pipe and the sixth valve in sequence into the anode protection acid cooler. By observation, when the flushing liquid reaches an appropriate amount, stop the circulation pump and stop injecting flushing liquid. Step C: Based on step B, close the seventh valve and the sixth valve, and open the second valve and the first valve in sequence. The compressed air inside the gas storage tank enters the anodic protective acid cooler through the second valve, the first connecting pipe and the first valve in sequence. This allows the flushing liquid inside the anodic protective acid cooler to be stirred and fully reacted with the scale inside the anodic protective acid cooler. The hydrogen gas overflowing from the pressure balance valve 8 due to the acid-base neutralization reaction is monitored by the hydrogen gas alarm. When no hydrogen gas overflows, it indicates that the reaction is fully completed, and the second valve is closed. Step D: Based on step C, open the third valve and the sixth valve, and start the circulation pump. The flushing liquid will pass through the first valve, the first connecting pipe, the third valve, the second connecting pipe, the circulation pump, the third connecting pipe, the sixth valve, the anolyte protection acid cooler, and then return to the first valve to start the large circulation cleaning. The pH value of the liquid will be monitored by a pH meter. When the pH value is less than 7, the circulation pump will be stopped. Step E: Based on step D, close the sixth valve and open the fifth valve to discharge the rinsing waste liquid. The rinsing waste liquid enters the waste liquid storage tank through the fifth valve. Step F: Based on step E, restart step BE according to the cleaning status, repeat the cleaning several times, then stop all processes to complete the cleaning.

[0014] The beneficial effects of this invention are as follows: 1. This invention, through the coordinated operation of the acid discharging component, the pressure supply component, and the flushing component, enables the cleaning of the anodic protective acid cooler. This removes and carries away the internal components of the anodic protective acid cooler, thereby increasing its service life, ensuring its heat exchange efficiency, and preventing system shutdowns due to severe blockage of the acid path in the anodic protective acid cooler. Simultaneously, the device reduces system operating costs, increases production capacity, and avoids the problem of accelerated corrosion caused by increased energy consumption or overheating.

[0015] 2. All connecting pipes in the device of this invention are made of acid and alkali resistant materials to ensure that the pipes will not be corroded by acids and alkalis during the use of the device. At the same time, all valves inside the device are fluoropolymer-lined butterfly valves, which can regulate the flow rate in the pipes and prevent liquid corrosion. The flushing fluid in the flushing component of this device is a high-temperature alkaline liquid, which can better clean the acid circuit inside the anodic protection acid cooler.

[0016] 3. The flushing of the anolyte protective acid cooler by the device of the present invention can be freely adjusted according to the downtime, and the equipment does not need to be disassembled. The anolyte protective acid cooler can be flushed during the maintenance of other equipment without the need for special maintenance. At the same time, the number of flushing and replacement cycles can be adjusted according to the internal acid circuit structure of the anolyte protective acid cooler, making the device very convenient to use.

[0017] 4. The device of this invention is equipped with a flow meter, which can monitor the flow rate during the acid release process in real time, making the overall operation process more intuitive and convenient.

[0018] 5. The device of the present invention is equipped with a pH meter and a thermometer, which can monitor the pH value and temperature of the circulating flushing liquid in the device in real time, thereby adjusting the flushing process according to different situations.

[0019] 6. The device of the present invention is equipped with a pressure balancing valve at the acid inlet of the anolyte protective acid cooler, which can balance the pressure inside and outside the anolyte protective acid cooler during the operation of the device, and is used to discharge gas during the displacement reaction inside the anolyte protective acid cooler, thereby effectively ensuring the stability of the entire working process. At the same time, a hydrogen alarm is installed at the pressure balancing valve, which can monitor the reaction inside the anolyte protective acid cooler in real time and accurately determine the reaction end time, thereby enhancing the convenience of the device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the device structure of the present invention.

[0021] Among them, 1-first valve, 2-second valve, 3-third valve, 4-fourth valve, 5-fifth valve, 6-sixth valve, 7-seventh valve, 8-pressure balancing valve, 9-rinsing fluid storage tank, 10-gas storage tank, 11-compressed air source, 12-circulation pump, 13-anodic protection acid cooler, 14-sulfuric acid underground tank, 15-pH meter, 16-temperature detector, 17-flow meter, 18-hydrogen alarm, 19-first connecting pipe, 20-second connecting pipe, 21-third connecting pipe, 22-waste liquid storage tank.

[0022] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] like Figure 1 As shown, this embodiment discloses an anolyte cooler with an automatic flushing function, including an anolyte cooler 13. A first connecting pipe 19 is provided at the acid outlet of the anolyte cooler 13. The first connecting pipe 19 is a four-way stainless steel pipe, and its four outlets are respectively equipped with a first valve 1, a second valve 2, a third valve 3, and a fourth valve 4. The first connecting pipe 19 is connected to the acid outlet of the anolyte cooler 13 through the first valve 1, connected to a pressure supply component through the second valve 2, and connected to a flushing component through the third valve 3. The other end of the flushing component is connected to the anolyte cooler. The acid inlet of the device 13 is connected, thus forming a loop between the anodic protection acid cooler 13 and the flushing assembly. The first connecting pipe 19 is connected to the acid discharge assembly through the fourth valve 4. The acid discharge assembly first discharges the acid remaining inside the anodic protection acid cooler 13. The flushing assembly repeatedly flushes and removes scale from the inside of the anodic protection acid cooler 13. The pressure supply assembly ensures that the flushing liquid inside the anodic protection acid cooler 13 reacts fully. At the same time, a pressure balancing valve 8 is provided at the acid inlet of the anodic protection acid cooler 13 to balance the pressure inside and outside the anodic protection acid cooler 13. A hydrogen alarm 18 is provided on one side of the outlet of the pressure balancing valve 8 to clearly monitor the status of the reaction process.

[0025] like Figure 1 As shown, the acid release assembly includes a sulfuric acid underground tank 14, which is connected to a first connecting pipe 19 via a fourth valve 4. The sulfuric acid underground tank 14 is also connected to the acid outlet of the anodic protection acid cooler 13 via the fourth valve 4 and the first valve 1. A flow meter 17 is installed on the first connecting pipe 19 on one side of the first valve 1. By opening the first valve 1 and the fourth valve 4, the acid originally inside the anodic protection acid cooler 13 enters the sulfuric acid underground tank 14 via the first valve 1, the first connecting pipe 19, and the fourth valve 4. The acid release process is monitored by the flow meter 17.

[0026] like Figure 1As shown, the pressure supply assembly includes a gas storage tank 10 and a compressed air source 11. The gas storage tank 10 is connected to the first connecting pipe 19 through the second valve 2. The compressed air source 11 is connected to the first connecting pipe 19 through the gas storage tank 10. At the same time, the gas storage tank 10 prioritizes storing compressed air from the compressed air source 11. When compressed air needs to be introduced, the second valve 2, the first valve 1, and the pressure balance valve 8 are opened. The compressed gas stored in the gas storage tank 10 enters the anolyte acid cooler 13 through the second valve 2 and the first valve 1, so that the flushing liquid inside the anolyte acid cooler 13 reacts fully with the scaled part of the acid path of the anolyte acid cooler 13. The hydrogen alarm 18 observes the amount of hydrogen that overflows from the pressure balance valve 8 due to the acid-base neutralization reaction. After no more hydrogen overflows, the second valve 2 is closed to complete the pressure supply operation.

[0027] like Figure 1As shown, the flushing assembly includes a flushing fluid storage tank 9, a circulation pump 12, and a waste liquid storage tank 22. A second connecting pipe 20 is provided between the circulation pump 12 and the flushing fluid storage tank 9. The second connecting pipe 20 is a three-way stainless steel pipe, and its three outlets are respectively connected to a first connecting pipe 19, the flushing fluid storage tank 9, and the circulation pump 12. A third valve 3 is provided between the second connecting pipe 20 and the first connecting pipe 19, and a seventh valve 7 is provided between the second connecting pipe 20 and the flushing fluid storage tank 9. A third valve 7 is provided between the circulation pump 12 and the waste liquid storage tank 22. The three-way connecting pipe 21 has three outlets connected to the circulating pump 12, the waste liquid storage tank 22, and the acid inlet of the anodic protection acid cooler 13, respectively. A fifth valve 5 is installed between the third connecting pipe 21 and the waste liquid storage tank 22, and a sixth valve 6 is installed between the third connecting pipe 21 and the acid inlet of the anodic protection acid cooler 13. A temperature detector 16 and a flow meter 17 are installed at the connection between the third connecting pipe 21 and the circulating pump 12. This allows for monitoring of the acid path inside the anodic protection acid cooler 13. During flushing, open valves 7 (seventh valve), 6 (sixth valve), and 8 (pressure balancing valve), and start the circulation pump 12. The flushing solution in the flushing solution storage tank 9 is then pumped sequentially through valve 7, circulation pump 12, third connecting pipe 21, and valve 6 into the anodic protection acid cooler 13. Then, close valves 7 and 6 and stop circulation pump 12. Start the pressure supply assembly to ensure the flushing solution inside the anodic protection acid cooler 13 reacts fully with the scale buildup in the acid path. After the reaction is complete, stop the pressure supply. When the pressure component is working, open the first valve 1, the third valve 3, and the sixth valve 6, and start the circulation pump 12. This allows the flushing fluid inside the anolyte acid cooler 13 to pass through the first valve 1, the third valve 3, the circulation pump 12, the sixth valve 6, and the anolyte acid cooler 13 in sequence, starting a large-scale circulation cleaning process. This process continues until the pH meter 15 displays a value less than 7, at which point the sixth valve 6 is closed and the fifth valve 5 is opened, discharging the flushed waste liquid into the waste liquid storage tank 22. During flushing, the number of flushing cycles can be adjusted according to the specific circumstances.

[0028] like Figure 1 As shown, the first connecting pipe 19, the second connecting pipe 20, the third connecting pipe 21 inside the device, and all connecting pipes between the various components of the device must be made of acid and alkali corrosion resistant materials. In this embodiment, stainless steel is used, but acid and alkali corrosion resistant materials such as fiberglass can also be used. At the same time, all valves inside the device, such as the first valve 1 and the second valve 2, must be valves that are resistant to liquid corrosion. In this embodiment, fluoropolymer-lined butterfly valves are used, which can control the flow rate while preventing liquid corrosion.

[0029] like Figure 1As shown, in this embodiment, the flushing fluid inside the flushing fluid storage tank 9 is a high-temperature alkaline liquid, which can react and neutralize the scale on the acid path of the anodic protection acid cooler 13, thereby improving the heat exchange effect of the anodic protection acid cooler 13, reducing the inlet acid temperature of the dry suction section tower during system operation, effectively improving the system's operating rate, increasing system operating time, and at the same time slowing down the corrosion of the equipment caused by overheating, extending the service life of the equipment, thereby improving the company's efficiency.

[0030] When using this invention, the following steps are included: Step A: Open the first valve 1, the fourth valve 4 and the pressure balancing valve 8, and close the other valves, so that the residual acid inside the anolyte protection acid cooler 13 enters the sulfuric acid underground tank 14 through the acid outlet in sequence through the first valve 1, the first connecting pipe 19 and the fourth valve 4 to complete the acid discharge operation, and monitor it through the flow meter 17. Step B: Based on step A, close the fourth valve 4 and the first valve 1, open the seventh valve 7 and the sixth valve 6, and start the circulation pump 12. The circulation pump 12 drives the flushing liquid in the flushing liquid storage tank 9 through the seventh valve 7, the circulation pump 12, the third connecting pipe 22 and the sixth valve 6 into the anode protection acid cooler 13. By observation, when the flushing liquid reaches an appropriate amount, stop the circulation pump 12 and stop injecting flushing liquid. Step C: Based on step B, close the seventh valve 7 and the sixth valve 6, and open the second valve 2 and the first valve 1 in sequence. The compressed air inside the gas storage tank 10 enters the anodic protective acid cooler 13 through the second valve 2, the first connecting pipe 19 and the first valve 1 in sequence. The flushing liquid inside the anodic protective acid cooler 13 is stirred and reacted with the scale inside the anodic protective acid cooler 13. The hydrogen gas overflowing from the pressure balance valve 8 due to the acid-base neutralization reaction is monitored by the hydrogen gas alarm 18. After no hydrogen gas overflows, it indicates that the reaction is complete. Then close the second valve 2. Step D: Based on step C, open the third valve 3 and the sixth valve 6, and start the circulation pump 12. The flushing liquid will pass through the first valve 1, the first connecting pipe 19, the third valve 3, the second connecting pipe 20, the circulation pump 12, the third connecting pipe 21, the sixth valve 6, and the anolyte protection acid cooler 13 in sequence, and then return to the first valve 1 to start the large circulation cleaning. The pH value of the liquid will be monitored by a pH meter. When the pH value is less than 7, the circulation pump 12 will be stopped. Step E: Based on step D, close the sixth valve 6 and open the fifth valve 5 to discharge the rinsing waste liquid. The rinsing waste liquid enters the waste liquid storage tank 22 through the fifth valve 5. Step F: Based on step E, restart step BE according to the cleaning status, repeat the cleaning several times, then stop all processes to complete the cleaning.

[0031] Taking a copper smelting production enterprise as an example, the flue gas generated by the copper smelting furnace and blowing furnace is cooled by a waste heat boiler, and then collected by an electrostatic precipitator and a bag filter before entering the acid production section. The flue gas then enters the dry suction section after purification. The primary suction anode protection acid cooling device experienced a continuous decline in heat exchange efficiency due to scaling. Before cleaning, the actual heat exchange coefficient of the primary suction anode protection acid cooling device was 641.57 W / K•m. 2 After cleaning, the heat transfer coefficient of the anode protection acid cooling device is 1137.81 W / K•m. 2 Furthermore, its logarithmic mean temperature difference decreased from 92.88℃ to 67.34℃; the actual heat transfer coefficient of the double-absorption anodic protection acid cooling device before washing was 6753.70 W / K•m. 2 After cleaning, the heat transfer coefficient of the anode protection acid cooling device is 1380.32 W / K•m. 2 Furthermore, its logarithmic mean temperature difference also decreased from 36.69℃ to 37.68℃. It can be clearly seen that after using this invention, the acid temperature at the outlet of the first-absorption anodic protective acid cooler of the anodic protective acid cooling device drops below 80℃, and the acid temperature at the outlet of the second-absorption anodic protective acid cooler drops below 70℃, with a significant increase in heat exchange efficiency.

[0032] In the description of this invention, it should be understood that the terms "center", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0033] If the terms "first" or "second" are used in this document to define components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing the invention and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of using an anodic protective acid cooler with an automatic flushing function, characterized in that, The acid outlet of the anodic protective acid cooler is provided with a first connecting pipe. The first connecting pipe is connected to the acid discharge component, the pressure supply component and the flushing component respectively. The other end of the flushing component is connected to the acid inlet of the anodic protective acid cooler. The acid discharge component first discharges the acid remaining inside the anodic protective acid cooler. The flushing component repeatedly flushes and removes scale from the inside of the anodic protective acid cooler. The pressure supply component ensures that the flushing liquid inside the anodic protective acid cooler reacts fully. The first connecting pipe is a four-way stainless steel pipe. The four outlets of the first connecting pipe are respectively equipped with a first valve, a second valve, a third valve and a fourth valve. The other end of the first valve is connected to the acid outlet of the anodic protection acid cooler. A flow meter is provided on one side of the first valve in the first connecting pipe. The other end of the second valve is connected to the pressure supply component. The other end of the third valve is connected to the flushing component. The other end of the fourth valve is connected to the acid discharge component. The pressure supply assembly includes an air tank and a compressed air source, and the connection sequence between the air tank, the compressed air source and the second valve is the second valve, the air tank and the compressed air source. The anode protection acid cooler is equipped with a pressure balancing valve at the acid inlet, and a hydrogen alarm is installed on one side of the pressure balancing valve. The flushing assembly includes a second connecting pipe, a flushing fluid storage tank, a circulation pump, a third connecting pipe, and a waste liquid storage tank. The second connecting pipe is connected to a third valve, the third connecting pipe is connected to the waste liquid storage tank, and a fifth valve is provided between the third connecting pipe and the waste liquid storage tank. The third connecting pipe is connected to the acid inlet of the anodic protective acid cooler, and a sixth valve is provided between the third connecting pipe and the anodic protective acid cooler. The flushing fluid storage tank is connected to the acid inlet of the anodic protective acid cooler in sequence through the second connecting pipe, the circulation pump, and the third connecting pipe, and a seventh valve is provided between the second connecting pipe and the flushing fluid storage tank. The second connecting pipe is a three-way stainless steel pipe, and the three outlets of the second connecting pipe are respectively connected to the third valve, the circulating pump and the flushing liquid storage tank. The third connecting pipe is a three-way stainless steel pipe, and the three outlets of the third connecting pipe are respectively connected to the circulating pump, the waste liquid storage tank and the acid inlet of the anode protection acid cooler. A pH meter and a temperature meter are installed at the connection between the third connecting pipe and the circulating pump, and both the pH meter and the temperature meter are connected to the third connecting pipe. The acid release assembly includes an underground sulfuric acid tank, which is connected to a fourth valve. The method of using an anodic protective acid cooler includes the following steps: Step A: Open the first valve, the fourth valve, and the pressure balancing valve, and close the other valves. This allows the residual acid inside the anolyte protection acid cooler to pass through the acid outlet, the first valve, the first connecting pipe, and the fourth valve in sequence, and enter the sulfuric acid underground tank to complete the acid discharge operation. The flow meter is used to monitor the process. Step B: Based on step A, close the fourth valve and the first valve, open the seventh valve and the sixth valve, and start the circulation pump. The circulation pump drives the flushing liquid in the flushing liquid storage tank to pass through the seventh valve, the circulation pump, the third connecting pipe and the sixth valve in sequence into the anode protection acid cooler. By observation, when the flushing liquid reaches an appropriate amount, stop the circulation pump and stop injecting flushing liquid. Step C: Based on Step B, close the seventh valve and the sixth valve, and open the second valve and the first valve in sequence. The compressed air inside the gas storage tank enters the anodic protective acid cooler through the second valve, the first connecting pipe and the first valve in sequence, so that the flushing liquid inside the anodic protective acid cooler is stirred and reacted fully with the scale inside the anodic protective acid cooler. The hydrogen gas overflowing from the pressure balance valve due to the acid-base neutralization reaction is monitored by the hydrogen gas alarm. When no hydrogen gas overflows, it means that the reaction is fully completed, and the second valve is closed. Step D: Based on step C, open the third valve and the sixth valve, and start the circulation pump. The flushing liquid will pass through the first valve, the first connecting pipe, the third valve, the second connecting pipe, the circulation pump, the third connecting pipe, the sixth valve, the anolyte protection acid cooler, and then return to the first valve to start the large circulation cleaning. The pH value of the liquid will be monitored by a pH meter. When the pH value is less than 7, the circulation pump will be stopped. Step E: Based on step D, close the sixth valve and open the fifth valve to discharge the rinsing waste liquid. The rinsing waste liquid enters the waste liquid storage tank through the fifth valve. Step F: Based on step E, restart step BE according to the cleaning status, repeat the cleaning several times, then stop all processes to complete the cleaning.

2. The method of using an anolyte cooler with automatic flushing function according to claim 1, characterized in that, The first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, and the seventh valve are all fluoropolymer-lined butterfly valves.

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