System for rapidly adjusting conductivity of raw water and control method thereof

Abstract

The invention discloses a system for rapidly adjusting the conductivity of raw water and a control method thereof. Conductivity sensors are arranged at the water tank, the electrolytic bath waterway outlet, the electrolytic bath waterway inlet and the circulating pump outlet in the electrolytic water waterway circulating system; the conductivity sensors are respectively positioned at the bottom of the water tank and in front of a circulating water inlet of the water tank; a drainage switch valve is arranged at an outlet of the circulating pump; the deionizer returns to the water tank in a manner of being connected with main circulating water in parallel, and is controlled to be switched on and off through a switching valve; the water tank is provided with a liquid level sensor for monitoring whether water in the water tank is sufficient or not. According to the method, the rising speed of the conductivity in the loop is judged, the rising position and the conductivity value are combined for judgment, and different processing methods are adopted, so that the purpose of reducing the conductivity in the loop is achieved. The system shutdown frequency can be effectively reduced, stable operation of the water electrolysis system is guaranteed, and meanwhile waste of raw material water is reduced.

Description

Technical Field

[0001] The invention relates to a system and method for adjusting the electrical conductivity of raw water, and in particular to a control method for quickly adjusting the electrical conductivity of raw water. Background Art

[0002] At present, the anode side of the water electrolysis system ensures the continuous supply of raw water for electrolysis to the electrolyzer for electrolysis through water circulation and water replenishment operations. In order to ensure sufficient supply of raw water, a water tank matching the water consumption is generally set up on the anode side. In addition, in order to better store and use the generated hydrogen, the current water electrolysis system will adopt a high-pressure operation mode. However, due to the permeability of the proton exchange membrane in the electrolyzer, the cathode pressure is usually higher than the anode side pressure, so the generated hydrogen will pass through the proton membrane to the anode side. Usually, in order to ensure the safe operation of the water electrolysis system, the hydrogen content in the oxygen generated on the anode side cannot exceed 2%. Therefore, this requires the anode side to control the concentration of hydrogen in oxygen. Usually, the oxygen generated on the anode side is not collected and stored, so the oxygen will be directly discharged into the atmosphere. Also in order to meet the above requirements, closed water tanks are usually not used. In addition, in order to ensure the discharge speed when the hydrogen concentration in the water tank is too high, a fan will be used to evacuate the water tank. At this time, a large amount of external air will enter the water tank, which will cause the conductivity of the water in the water tank to increase, thereby affecting the normal operation of the electrolyzed water system. Therefore, it is necessary to control the conductivity of the electrolyzed water.

[0003] In the current scheme, the absolute value of conductivity is mostly used to determine whether the electrolysis water is running and to shut down the water tank for water replacement. This makes the electrolysis water system discontinuous and wastes a lot of raw water. The existing deionized water conductivity adjustment method uses a simple series deionization tank and shutdown water replacement operation to ensure that the conductivity of the deionized water meets the standard. During operation, the deionization effect of the deionization tank will continue to decay, reducing the service life of the deionization tank. At the same time, it will increase the flow resistance of the entire road and increase the power consumption of the electrolysis water system. In addition, frequent shutdown and startup operations will reduce the stability of the electrolysis water system. At the same time, during the startup process, due to the low power, the hydrogen concentration in the oxygen will increase, which increases the safety risk. In addition, too many starts and stops will also waste wind and solar resources.

[0004] The present invention can adjust the conductivity of deionized water in a more refined manner, and take corresponding operations according to the size, rising order and rising speed of the conductivity, thereby reducing the use frequency of the deionized tank, reducing the frequency of stopping to change water, and reducing the waste of raw water. The present invention monitors the conductivity of each position, and at the same time determines the cause of the increase in the conductivity of the deionized water and the subsequent operations by obtaining the order and rising speed of the conductivity increase at each position, so as to adjust the conductivity of the raw water and ensure the stable operation of the electrolytic water system. Summary of the invention

[0006] The electrolysis water system needs to use low-conductivity deionized water as raw water for electrolysis, which is to ensure the insulation of various components during the operation of the electrolysis water system, prevent short circuits from causing damage to the electrolysis water system, and even safety problems. The present invention ensures the stable operation of the electrolysis water system by controlling and adjusting the conductivity of the raw water, reducing the number of shutdowns of the electrolysis water system and the waste of raw water.

[0007] The purpose of the present invention is achieved by at least one of the following technical solutions.

[0008] A system for rapidly adjusting the conductivity of raw water comprises conductivity sensors arranged at a water tank, an electrolytic cell water outlet, an electrolytic cell water inlet and a circulating pump outlet in an electrolytic water water circulation system; drainage switch valves are arranged at the positions of the conductivity sensors, which are located at the bottom of the water tank, in front of the circulating water inlet of the water tank and at the circulating pump outlet; a deionizer is connected in parallel with the main circulating water and returns to the water tank, and the on-off is controlled by a switch valve; and the water tank is provided with a liquid level sensor to monitor whether the amount of water in the water tank is sufficient.

[0009] The system for rapidly adjusting the conductivity of raw water comprises a water purifier, a water tank, a blower, a PEM electrolyzer, a deionizer and a circulation pump; the water purifier is connected to the water tank and the blower in sequence, the deionized water outlet at the bottom of the water tank is connected to the circulation pump, the circulation pump is respectively connected to the deionizer and the PEM electrolyzer, and the deionizer is connected to the water tank; the water tank is also connected to the PEM electrolyzer; the PEM electrolyzer is connected to a direct current power supply; the PEM electrolyzer, the bottom outlet of the water tank and the circulation pump are respectively connected to the waste liquid outlet through pipelines; the water tank, the electrolyzer waterway outlet, the electrolyzer waterway inlet and the circulation pump outlet are respectively provided with a first conductivity sensor, a second conductivity sensor, a fourth conductivity sensor and a third conductivity sensor.

[0010] Furthermore, a second drainage switch valve is provided on the pipeline between the PEM electrolyzer and the waste liquid outlet.

[0011] Furthermore, a first drainage switch valve is provided on the pipeline between the bottom outlet of the water tank and the waste liquid outlet.

[0012] Furthermore, a third drainage switch valve is provided on the pipeline between the circulation pump and the waste liquid outlet; the water purifier is connected to the city water inlet, and a city water switch valve is provided on the pipeline between the water purifier and the city water inlet.

[0013] Furthermore, an isolation valve is provided on the pipeline between the water purifier and the water tank; a switch valve is provided on the inlet pipeline of the deionizer; and a flow meter is provided on the pipeline between the circulation pump and the PEM electrolyzer.

[0014] Furthermore, the above system also includes an air filter, which is placed above the water tank and is used to filter the gas entering the water tank.

[0015] A control method for a system for rapidly adjusting the conductivity of raw water is disclosed. The method determines the rising speed of the conductivity in a circuit, the rising position and the conductivity value, and adopts different processing methods to achieve the purpose of reducing the conductivity in the circuit. The method makes the value of the controlled conductivity more accurate, adopts different processing methods according to different conditions, can effectively reduce the system shutdown frequency, ensure the stable operation of the electrolyzed water system, and reduce the waste of raw water.

[0016] The specific control method includes the following steps: During operation, the values ​​of each conductivity sensor remain stable. If an abnormal conductivity value rises abnormally (S01), the control unit first determines the conductivity rising speed (S02). If the rising speed is less than or equal to the first rising speed (0.1~1 μS / cm / min) (the first rising speed < the second rising speed (5~10 μS / cm / min)), it is considered that the ion content and precipitation amount in the entire circuit are small, and the switch valve at the deionizer is opened (S03). The deionizer is used to remove ions from the raw water, thereby reducing the conductivity of the water in the circuit. At this time, it is further determined whether the conductivity is still rising (S04) to determine whether the operation of reducing the conductivity is appropriate. If the conductivity is decreasing, it is further determined whether the conductivity in the circuit is less than or equal to the first conductivity value (0.1~6 μS / cm) (the first conductivity value < the second conductivity value (10~20 μS / cm) (S05), if it is less than or equal to the first value of conductivity, it means that the ion content in the loop is reduced and the operation requirements of the electrolyzed water system are met. If it is greater than the first value of conductivity, continue the deionization tank treatment operation to reduce the conductivity in the loop (S03), keep circulating until the conductivity is less than or equal to the first value, then stop the operation, close the switch valve at the deionization tank and close the first drainage switch valve, the second drainage switch valve and the third drainage switch valve (S06), and the system operates normally; if in this part of the operation, the conductivity rising speed is not reduced to a negative value (S04), it means that the treatment operation cannot effectively reduce the conductivity in the loop, and the second method of reducing the conductivity in the loop needs to be adopted; The second method of reducing the conductivity in the circuit comprises the following steps: During normal operation, if the conductivity value rises abnormally (S01), the control unit first determines the rising speed of the conductivity (S02). If the rising speed is greater than the first rising speed, it further determines whether the rising speed of the conductivity value is greater than the second rising speed (S07). If it is less than or equal to the second rising speed, the position where the conductivity rises is determined by the position of the conductivity sensor (S08). It is further determined whether the conductivity rising position exceeds one position (S09). If it does not exceed one position, a processing operation is taken to open the drainage switch valve at the conductivity rising position (corresponding to one of the first drainage switch valve, the second drainage switch valve or the third drainage switch valve), and perform water replenishment operation according to the liquid level sensor at the water tank (S10). It is further determined whether the conductivity rising speed is a negative value (S11). If so, it means that the operation is effective in reducing the conductivity in the circuit. It is further determined whether the conductivity value is less than or equal to the first conductivity value (0.1~6 μS / cm) (the first conductivity value < the second conductivity value (10~20 μS / cm)) (S12), if it is less than or equal to the first conductivity value, it means that the ion content in the loop is reduced and meets the operation requirements of the electrolytic water system. If it is greater than the first conductivity value, continue the deionization tank treatment operation to reduce the conductivity in the loop (S10), keep the cycle until the conductivity is less than or equal to the first conductivity value, then stop the operation, close the switch valve at the deionizer and close the first drainage switch valve, the second drainage switch valve and the third drainage switch valve (S06), and the system operates normally; if in this part (S07) the conductivity value rises more than the second conductivity rise speed, (S09) the conductivity sensor rises more than 1 position, and the conductivity rise speed in (S11) is not a negative value, then execute the third part of the method for reducing the conductivity in the loop; The third method of reducing the conductivity in the circuit comprises the following steps: If the conductivity value rises faster than the second rise speed, determine whether the conductivity value is larger than the second value (S13). If it is larger, it means that the conductivity of the raw water in the system rises abnormally fast, and the raw water no longer meets the requirements for the normal operation of the electrolysis water system. It is necessary to shut down the system (S17), drain all the water in the system, and determine the cause of the abnormal rise in conductivity based on the rise speed of each conductivity sensor, and solve it in a targeted manner. If the conductivity value is less than or equal to the second value, open all the drainage switch valves (the first drainage switch valve, the second drainage switch valve and the third drainage switch valve) (S14), and perform water replenishment according to the liquid level sensor to quickly replace the raw water in the circuit. In the second part (S09), if the conductivity sensor rises more than one position, and the conductivity rise speed in (S11) is not negative, then the same operation is performed (S14). 14), replace the raw water; determine whether the operation is effective by judging whether the conductivity increase is a negative value. If it is not a negative value, it is considered that the method can no longer solve the conductivity increase problem and needs to be shut down (S17); if the rising speed is a negative value, it means that the method can effectively reduce the conductivity of the raw water in the loop; further determine whether the conductivity value is less than or equal to the first value (S16). If the conductivity is reduced to less than or equal to the first value, it means that the ion content in the loop is reduced and meets the operation requirements of the electrolytic water system. If it is greater than the first value, continue to replace the raw water and reduce the conductivity in the loop (S14). Keep circulating until the conductivity is adjusted to less than or equal to the first value, then stop the operation, close the switch valve at the deionization tank and close the first drainage switch valve, the second drainage switch valve and the third drainage switch valve (S06), and the system operates normally.

[0017] Compared with the prior art, the advantages of the present invention are: The present invention is to judge the rising speed of the conductivity in the circuit and the rising position and the conductivity value jointly, and adopt different processing methods to achieve the purpose of reducing the conductivity in the circuit. The method makes the control of the conductivity value more accurate, and the processing method is faster. Different processing methods are adopted for different conditions, which can effectively reduce the system shutdown frequency, ensure the stable operation of the electrolysis water system, and reduce the waste of raw water. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the water circuit circulation system for electrolyzed water of the present invention; Figure 2 Flow chart of the control method of the present invention.

[0019] The components in the figure are as follows: city water inlet 1, city water switch valve 2, pure water machine 3, switch valve 4, deionizer 5, isolation valve 6, first conductivity sensor 7, fan 8, water tank 9, first drain switch valve 10, second drain switch valve 11, air filter 12, second conductivity sensor 13, DC power supply 14, PEM electrolyzer 15, fourth conductivity sensor 16, flow meter 17, third drain switch valve 18, waste liquid outlet 19, circulation pump 20, third conductivity sensor 21. DETAILED DESCRIPTION

[0021] Example 1 A system for rapidly adjusting the conductivity of raw water, the structure of which is as follows Figure 1 It includes a water purifier 3, a water tank 9, a fan 8, a PEM electrolyzer 15, a deionizer 5 and a circulation pump 20; the water purifier 3 is connected to the water tank 9 and the fan 8 in sequence, the deionized water outlet at the bottom of the water tank 9 is connected to the circulation pump 20, the circulation pump 20 is connected to the deionizer 5 and the PEM electrolyzer 15 respectively, the deionizer 5 is connected to the water tank 9; the water tank 9 is also connected to the PEM electrolyzer 15; the PEM electrolyzer 15 is connected to the DC power supply 14 ... , the bottom outlet of the water tank 9 and the circulating pump 20 are connected to the waste liquid outlet 19 through pipelines respectively; in this embodiment, four conductivity sensors are set in the electrolytic water water circulation system, which are respectively located at the water tank, the electrolytic cell water outlet, the electrolytic cell water inlet and the circulating pump outlet; specifically, the first conductivity sensor 7, the second conductivity sensor 13, the fourth conductivity sensor 16 and the third conductivity sensor 21 are respectively set at the water tank 9, the electrolytic cell water outlet, the electrolytic cell water inlet and the circulating pump outlet. A second drainage switch valve 11 is set on the pipeline between the PEM electrolytic cell 15 and the waste liquid outlet 19. In this embodiment, the deionizer 5 is connected in parallel and is controlled by a switch valve; the water tank is equipped with a liquid level sensor to monitor whether the water in the water tank is sufficient.

[0022] In this embodiment, three drain switch valves are provided, which are respectively located at the bottom of the water tank, in front of the circulating water inlet of the water tank, and at the outlet of the circulating pump; specifically, a first drain switch valve 10 is provided on the pipeline between the bottom outlet of the water tank 9 and the waste liquid outlet 19. A third drain switch valve 18 is provided on the pipeline between the circulating pump 20 and the waste liquid outlet 19; the water purifier 3 is connected to the city water inlet 1, and a city water switch valve 2 is provided on the pipeline between the water purifier 3 and the city water inlet 1. An isolation valve 6 is provided on the pipeline between the water purifier 3 and the water tank 9; a switch valve 4 is provided on the inlet pipeline of the deionizer 5; and a flow meter 17 is provided on the pipeline between the circulating pump 20 and the PEM electrolyzer 15. This embodiment also includes an air filter 12, which is placed above the water tank 9 to filter the gas entering the water tank.

[0023] The following embodiments all adopt the system for rapidly adjusting the conductivity of raw water in this embodiment.

[0024] Example 2 During operation, the values ​​of each conductivity sensor remain stable. If an abnormal conductivity value rises abnormally S01, the control device first determines the rising speed of the conductivity S02. The rising speed of the conductivity in this embodiment is measured to be 0.01 μS / cm / min, which is less than or equal to the first rising speed of 0.1~1 μS / cm / min. At this time, it is considered that the ion content and precipitation amount in the entire circuit are small, and the switch valve at the deionization tank is opened S03. The raw water is deionized through the deionization tank, thereby reducing the conductivity of the water in the circuit. At this time, it is further determined whether the conductivity is still rising S04 to determine whether the operation of reducing the conductivity is appropriate. In this embodiment, the conductivity is decreasing, and it is necessary to further determine whether the conductivity in the circuit is less than or equal to the first value. At this time, the conductivity in the circuit is 0.05 μS / cm, which is less than the first value 0.1~6 μS / cm S05. If it is less than or equal to the first conductivity value, it means that the ion content in the circuit is reduced and the operation requirements of the electrolytic water system are met. If it is greater than the first value, continue the deionization tank processing operation to reduce the conductivity in the loop S03, keep circulating until the conductivity is adjusted to be less than or equal to the first value, then stop the operation, close the switch valve at the deionization tank and close the first drain switch valve 10, the second drain switch valve 11 and the third drain switch valve 18 S06, and the system operates normally.

[0025] Example 3 During operation, the values ​​of each conductivity sensor remain stable. If an abnormal conductivity value rises abnormally S01, the control device first determines the conductivity rise rate S02. The conductivity rise rate in this embodiment is measured to be 0.05 μS / cm / min, which is less than or equal to the first rise rate of 0.1~1 μS / cm / min. At this time, it is considered that the ion content and precipitation amount in the entire circuit are small, and the switch valve at the deionization tank is opened S03. The raw water is deionized through the deionization tank, thereby reducing the conductivity of the water in the circuit. At this time, it is determined whether the conductivity is still rising S04 to determine whether the operation of reducing the conductivity is appropriate. In this embodiment, the conductivity is decreasing, and it is necessary to further determine whether the conductivity in the circuit is less than or equal to the first value. At this time, the conductivity in the circuit is 7 μS / cm S05, which is greater than the first value of 0.1~6 μS / cm S05, continue the deionization tank processing operation to reduce the conductivity in the loop S03, keep circulating until the conductivity is adjusted to be less than or equal to the first value, then stop the operation, close the switch valve at the deionization tank and close the first drainage switch valve 10, the second drainage switch valve 11 and the third drainage switch valve 18 S06, the system operates normally.

[0026] Example 4 During operation, the values ​​of each conductivity sensor remain stable. If an abnormal conductivity value rises abnormally S01, the control device first determines the rising speed of the conductivity S02. The rising speed of the conductivity in this embodiment is measured to be 0.08 μS / cm / min, which is less than or equal to the first rising speed of 0.1-1 μS / cm / min. At this time, it is considered that the ion content and precipitation amount in the entire circuit are small, and the switch valve at the deionization tank is opened S03. The deionization tank is used to remove ions from the raw water, thereby reducing the conductivity of the water in the circuit. At this time, it is further determined whether the conductivity is still rising S04 to determine whether the operation of reducing the conductivity is appropriate; In this embodiment, the conductivity rising speed does not decrease and does not reach a negative value S04, which means that the processing operation cannot effectively reduce the conductivity in the circuit, and it is necessary to adopt a second method for reducing the conductivity in the circuit, execute S08, and determine the conductivity rising position.

[0027] The second method to reduce the conductivity in the circuit is: First, the position of the conductivity rise is determined by the position of the conductivity sensor S08, and further it is determined whether the conductivity rise position exceeds 1 position S09. If not, a processing operation is taken to open the drainage switch valve (corresponding to the first drainage switch valve 10, the second drainage switch valve 11 or the third drainage switch valve 18) at the conductivity rise position, and a water replenishment operation is performed according to the liquid level sensor at the water tank S10. It is further determined whether the conductivity rise rate is a negative value S11. If so, it means that the operation is effective in reducing the conductivity in the circuit. It is further determined whether the conductivity value 0.05 μS / cm is less than or equal to the first value 0.1~6 μS / cm S12. In this embodiment, if it is less than or equal to the first conductivity value, it means that the ion content in the circuit is reduced and the operation requirements of the electrolytic water system are met. The switch valve at the deionization tank and the first drainage switch valve 10, the second drainage switch valve 11 and the third drainage switch valve 18 are closed S06, and the system operates normally. 。

[0028] Example 5 During operation, the values ​​of each conductivity sensor remain stable. If an abnormal conductivity value rises abnormally S01, the control device first determines the rising speed of the conductivity S02. The rising speed of the conductivity in this embodiment is measured to be 0.09 μS / cm / min, which is less than or equal to the first rising speed of 0.1-1 μS / cm / min. At this time, it is considered that the ion content and precipitation amount in the entire circuit are small, and the switch valve at the deionization tank is opened S03. The raw water is deionized through the deionization tank, thereby reducing the conductivity of the water in the circuit. At this time, it is further determined whether the conductivity is still rising S04 to determine whether the operation of reducing the conductivity is appropriate; In this embodiment, the conductivity rising speed does not decrease and does not reach a negative value S04, which means that the processing operation cannot effectively reduce the conductivity in the circuit, and it is necessary to adopt a second method for reducing the conductivity in the circuit, execute S08, and determine the conductivity rising position.

[0029] The second method to reduce the conductivity in the circuit is: The position where the conductivity rises is determined by the position of the conductivity sensor S08, and it is further determined whether the conductivity rise position exceeds 1 position S09. If not, a processing operation is taken to open the drainage switch valve at the conductivity rise position (corresponding to the first drainage switch valve 10, the second drainage switch valve 11 or the third drainage switch valve 18), and a water replenishment operation is performed according to the liquid level sensor at the water tank S10. It is further determined whether the conductivity rise rate is a negative value S11. If so, it means that the operation is effective in reducing the conductivity in the circuit. It is further determined whether the conductivity value is less than or equal to the first value 0.1~6 μS / cm S12. If it is less than or equal to the first conductivity value, it means that the ion content in the circuit is reduced and the operation requirements of the electrolytic water system are met. The switch valve at the deionization tank and the first drainage switch valve 10, the second drainage switch valve 11 and the third drainage switch valve 18 are closed S06, and the system operates normally. If it is greater than the first value, continue the deionization tank treatment operation to reduce the conductivity in the circuit S10, keep circulating until the conductivity is adjusted to be less than or equal to the first value, then stop the operation, close the switch valve at the deionization tank and close the first drainage switch valve 10, the second drainage switch valve 11 and the third drainage switch valve 18 S06, and the system operates normally. If the conductivity sensor rise position in S09 in this part exceeds 1, and the conductivity rise speed in S11 is not a negative value, execute the third part.

[0030] The third part is: At this time, open all drain valves S14, and perform water replenishment operation according to the liquid level sensor to quickly place the raw water in the loop; determine whether the operation is effective by judging whether the conductivity rise is a negative value. If it is not a negative value, it is considered that this method can no longer solve the problem of conductivity rise, and it is necessary to perform a shutdown operation S17. If the rising speed is a negative value, it means that this method can effectively reduce the conductivity of the raw water in the loop; further determine whether the conductivity value is less than or equal to the first value S16. If the conductivity is reduced to less than or equal to the first value, it means that the ion content in the loop is reduced and meets the operation requirements of the electrolytic water system. If it is greater than the first value, continue the deionization tank processing operation to reduce the conductivity in the loop S14, keep circulating until the conductivity is adjusted to less than or equal to the first value, then stop the operation, close the switch valve at the deionization tank, and close the first drainage switch valve 10, the second drainage switch valve 11 and the third drainage switch valve 18 S06, and the system operates normally.

[0031] This method is to determine the rising speed of the conductivity in the circuit, the rising position and the conductivity value, and use different treatment methods to achieve the purpose of reducing the conductivity in the circuit. This method controls the conductivity value more accurately, and uses different treatment methods for different conditions, which can effectively reduce the system shutdown frequency, ensure the smooth operation of the electrolysis water system, and reduce the waste of raw water.

Claims

1. A system for rapidly adjusting the conductivity of raw water, characterized in that: In the electrolytic water circulation system, conductivity sensors are arranged at the water tank, the electrolytic cell water outlet, the electrolytic cell water inlet and the circulation pump outlet; the conductivity sensors are respectively arranged at the bottom of the water tank, in front of the water tank circulating water inlet and at the circulation pump outlet; the deionizer returns to the water tank in parallel with the main circulating water and is controlled by the switch valve; the water tank is provided with a liquid level sensor to monitor whether there is enough water in the water tank.

2. The system for rapidly adjusting the conductivity of raw water according to claim 1, characterized in that: The invention comprises a water purifier (3), a water tank (9), a fan (8), a PEM electrolyzer (15), a deionizer (5) and a circulation pump (20); the water purifier (3) is connected to the water tank (9) and the fan (8) in sequence; the deionized water outlet at the bottom of the water tank (9) is connected to the circulation pump (20); the circulation pump (20) is connected to the deionizer (5) and the PEM electrolyzer (15) respectively; the deionizer (5) is connected to the water tank (9); the water tank (9) is also connected to the PEM electrolyzer (15); the PEM electrolyzer (15) is connected to a direct current power supply (14); the PEM electrolyzer (15), the bottom outlet of the water tank (9) and the circulation pump (20) are respectively connected to a waste liquid outlet (19) through pipelines; A first conductivity sensor (7), a second conductivity sensor (13), a fourth conductivity sensor (16) and a third conductivity sensor (21) are respectively arranged at the water tank (9), the electrolytic cell water channel outlet, the electrolytic cell water channel inlet and the circulation pump outlet.

3. The system for rapidly adjusting the conductivity of raw water according to claim 2, characterized in that: A second drainage switch valve (11) is provided on the pipeline between the PEM electrolytic cell (15) and the waste liquid outlet (19).

4. The system for rapidly adjusting the conductivity of raw water according to claim 2, characterized in that: A first drainage switch valve (10) is provided on the pipeline between the bottom outlet of the water tank (9) and the waste liquid outlet (19).

5. The system for rapidly adjusting the conductivity of raw water according to claim 2, characterized in that: A third drainage switch valve (18) is provided on the pipeline between the circulation pump (20) and the waste liquid outlet (19); the water purifier (3) is connected to the municipal water inlet (1), and a municipal water switch valve (2) is provided on the pipeline between the water purifier (3) and the municipal water inlet (1).

6. The system for rapidly adjusting the conductivity of raw water according to claim 2, characterized in that: An isolation valve (6) is provided on the pipeline between the water purifier (3) and the water tank (9); a switch valve 4 is provided on the inlet pipeline of the deionizer (5); and a flow meter (17) is provided on the pipeline between the circulation pump (20) and the PEM electrolyzer (15).

7. The system for rapidly adjusting the conductivity of raw water according to claim 2, characterized in that: It also includes an air filter (12), which is placed above the water tank (9) and is used to filter the gas entering the water tank.

8. The control method of the system according to any one of claims 1 to 7, characterized in that: By judging the rising speed of the conductivity in the circuit and the rising position and the conductivity value, different treatment methods are adopted to achieve the purpose of reducing the conductivity in the circuit; this method makes the control of the conductivity value more accurate, and adopts different treatment methods according to different conditions, which can effectively reduce the system shutdown frequency, ensure the smooth operation of the electrolyzed water system, and reduce the waste of raw water.

9. The control method according to claim 8, characterized in that: The steps include: During operation, the values ​​of each conductivity sensor remain stable. If an abnormal conductivity value rises abnormally (S01), the control unit first determines the rising speed of the conductivity (S02). If the rising speed is less than or equal to the first rising speed, it is considered that the ion content and precipitation amount in the entire circuit are small, and the switch valve at the deionizer is opened (S03). The deionizer is used to remove ions from the raw water, thereby reducing the conductivity of the water in the circuit. At this time, it is further determined whether the conductivity is still rising (S04) to determine whether the operation of reducing the conductivity is appropriate. If the conductivity is decreasing, it is further determined whether the conductivity in the circuit is less than or equal to the first conductivity value (S0 5), if the conductivity is less than or equal to the first value, it means that the ion content in the circuit is reduced and the operation requirements of the electrolysis water system are met. If the conductivity is greater than the first value, the deionization tank treatment operation is continued to reduce the conductivity in the circuit (S03), and the cycle is maintained until the conductivity is less than or equal to the first value, and then the operation is stopped, the switch valve at the deionization tank is closed, and the first drainage switch valve (10), the second drainage switch valve (11) and the third drainage switch valve (18) are closed (S06), and the system operates normally; if the conductivity rise rate does not decrease to a negative value during this part of the operation (S04), it means that the treatment operation cannot effectively reduce the conductivity in the circuit, and the second method of reducing the conductivity in the circuit needs to be adopted; The second method of reducing the conductivity in the circuit comprises the following steps: During normal operation, if the conductivity value rises abnormally (S01), the control unit first determines the rising speed of the conductivity (S02). If the rising speed is greater than the first rising speed, it is further determined whether the rising speed of the conductivity value is greater than the second rising speed (S07). If it is less than or equal to the second rising speed, the position where the conductivity rises is determined by the position of the conductivity sensor (S08). It is further determined whether the conductivity rising position exceeds one position (S09). If it does not exceed one position, a processing operation is taken to open the switch valve at the conductivity rising position, that is, the first drainage switch valve (10), the second drainage switch valve (11) or the third drainage switch valve (18), and a water replenishment operation is performed according to the liquid level sensor at the water tank (S10). It is further determined whether the conductivity rising speed is a negative value (S11). If so, it means that the operation is effective in reducing the return The conductivity in the circuit is effective, and it is further determined whether the conductivity value is less than or equal to the first conductivity value (S12). If it is less than or equal to the first conductivity value, it means that the ion content in the circuit is reduced and the operation requirements of the electrolysis water system are met. If it is greater than the first conductivity value, the deionization tank treatment operation is continued to reduce the conductivity in the circuit (S10), and the cycle is maintained until the conductivity is less than or equal to the first conductivity value, and then the operation is stopped, the switch valve at the deionizer is closed, and the first drainage switch valve 10, the second drainage switch valve 11 and the third drainage switch valve 18 are closed (S06), and the system operates normally; if in this part (S07) the conductivity value rises more than the second conductivity rise speed, (S09) the conductivity sensor rises more than 1 position, and the conductivity rise speed in (S11) is not a negative value, the third part of the method for reducing the conductivity in the circuit is executed; The third method of reducing the conductivity in the circuit comprises the following steps: If the conductivity value rise speed is greater than the second rise speed, determine whether the conductivity value is greater than the second value (S13); if greater, it means that the conductivity of the raw water in the system is rising abnormally fast, and the raw water no longer meets the requirements for the normal operation of the electrolysis water system, and it is necessary to shut down the system (S17), drain all the water in the system, and determine the cause of the abnormal rise in conductivity based on the rise speed of each conductivity sensor, and solve it in a targeted manner; if the conductivity value is less than or equal to the second value, open the first drainage switch valve (10), the second drainage switch valve (11) and the third drainage switch valve (18) (S14), and at the same time perform water replenishment according to the liquid level sensor to quickly replace the raw water in the circuit; in the second part (S09), if the conductivity sensor rises to more than one position and the conductivity rise speed in (S11) is not a negative value, then perform (S14) in the same way, and proceed The method further comprises: performing raw water replacement; determining whether the operation is effective by judging whether the conductivity increase is a negative value; if not, it is considered that the method can no longer solve the conductivity increase problem and a shutdown operation is required (S17); if the increase rate is a negative value, it indicates that the method can effectively reduce the conductivity of the raw water in the loop; further determining whether the conductivity value is less than or equal to a first value (S16); if the conductivity is reduced to less than or equal to the first value, it indicates that the ion content in the loop is reduced and the operation requirements of the electrolytic water system are met; if it is greater than the first value, continuing to replace the raw water and reducing the conductivity in the loop (S14); maintaining the cycle until the conductivity is adjusted to less than or equal to the first value; then stopping the operation, closing the switch valve at the deionization tank and closing the first drainage switch valve (10), the second drainage switch valve (11) and the third drainage switch valve (18) (S06), and the system operates normally.

10. The control method according to claim 8, characterized in that: The first rising speed is 0.1-1 μS / cm / min; the second rising speed is 5-10 μS / cm / min; the first value of the conductivity is 0.1-6 μS / cm; the second value of the conductivity is 10-20 μS / cm.

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