An ultrapure water purification system and a control method thereof

Abstract

The application discloses a kind of ultrapure water purification systems and its control method, ultrapure water purification system includes water supply port, first conductivity detection module, second conductivity detection module, water storage tank, first liquid level switch, second liquid level switch, circulating pump, water filter module, water flow controller, main controller and ultrapure water outlet;Wherein, first water outlet, circulating pump, water filter module and second water inlet constitute circulation loop, first water outlet, circulating pump, water filter module, water flow controller and ultrapure water outlet constitute output flow path;First conductivity detection module is used to detect the conductivity of ultrapure water at the output end of water supply port, and the second conductivity detection module is used to detect the conductivity of ultrapure water at the output end of the water filter module;The main controller can control the opening or closing of the circulation loop and the output loop according to different conductivity detection values, so that the conductivity of ultrapure water output to the electrochemical energy conversion device meets the standard, and the service life of the reactor is avoided to be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a purified ultrapure water system and a control method thereof. BACKGROUND

[0002] Fuel cell devices and electrolytic cell devices are both electrochemical energy conversion devices, in which ultrapure water is needed to participate in the reaction. In the fuel cell device, ultrapure water reacts with fuel gas at high temperature to realize the reforming of the fuel gas. In the electrolytic cell device, ultrapure water is used to electrolyze to produce hydrogen. Therefore, an ultrapure water preparation system is needed to prepare ultrapure water for the electrochemical energy conversion device. However, before the ultrapure water prepared by the ultrapure water preparation system participates in the reaction of the electrochemical energy conversion device, the ultrapure water is usually first stored in a water storage tank. In this process, oxygen, carbon dioxide and other gases are easily dissolved in the ultrapure water, which pollutes the ultrapure water and increases the electrical conductivity of the ultrapure water, ultimately reducing the service life of the reactor (cell stack or electrolysis stack) of the electrochemical energy conversion device. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide a purified ultrapure water system and a control method thereof, which can filter and detect the electrical conductivity of ultrapure water, thereby greatly reducing the electrical conductivity of the ultrapure water entering the electrochemical energy conversion device and avoiding reducing the service life of the reactor.

[0004] To achieve the above-mentioned purpose, the embodiments of the present application provide a purified ultrapure water system, which comprises a water supply port, a first electrical conductivity detection module, a second electrical conductivity detection module, a water storage tank, a first liquid level switch, a second liquid level switch, a circulating pump, a water filtration module, a water flow controller, a main controller and an ultrapure water outlet.

[0005] The output end of the water supply port is connected with the first water inlet of the water storage tank. The first water outlet of the water storage tank is connected with the input end of the circulating pump. The output end of the circulating pump is connected with the input end of the water filtration module. The output end of the water filtration module is connected with the second water inlet of the water storage tank and the input end of the water flow controller, respectively. The output end of the water flow controller is connected with the input end of the ultrapure water outlet. The output end of the ultrapure water outlet is connected with the input end of the electrochemical energy conversion device. The first electrical conductivity detection module is arranged between the water supply port and the first water inlet. The second electrical conductivity detection module is arranged between the output end of the water filtration module and the second water inlet. The first liquid level switch is arranged at a position close to the top in the water storage tank, and the second liquid level switch is arranged at a position close to the bottom in the water storage tank.

[0006] As an improvement of the above-mentioned scheme, the water filtration module is an EDI module.

[0007] As an improvement of the above-mentioned scheme, the ultrapure water purification system further comprises a first temperature detection module and a second temperature detection module, wherein:

[0008] The first temperature detection module is arranged between the water supply port and the first water inlet;

[0009] The second temperature detection module is arranged between the output end of the water filter module and the second water inlet;

[0010] And the first temperature detection module and the second temperature detection module are both in communication connection with the main controller.

[0011] As an improvement of the above-mentioned scheme, the main controller is in communication connection with the first conductivity detection module, the second conductivity detection module, the first liquid level switch, the second liquid level switch, the water filter module, the circulating pump and the water flow controller respectively.

[0012] To achieve the above-mentioned purpose, the embodiment of the present application further provides a control method of the ultrapure water purification system based on any one of the above-mentioned embodiments, which is executed by the main controller, and when the electrochemical energy conversion device does not start working, the control method of the ultrapure water purification system comprises:

[0013] When the first liquid level switch and the second liquid level switch are both disconnected, water is injected into the water storage tank through the water supply port, and the circulating loop and the output flow path are closed;

[0014] When the first liquid level switch is disconnected and the second liquid level switch is connected, the water filter module is started and the circulating loop is opened;

[0015] When the first liquid level switch and the second liquid level switch are both connected, the injection of water into the water storage tank is stopped;

[0016] When the second conductivity detection value is less than the second threshold value, the output flow path is opened;

[0017] The second conductivity detection value is the conductivity detection value of the ultrapure water in the circulating loop; the circulating loop is composed of the first water outlet, the circulating pump, the water filter module and the second water inlet; and the output flow path is composed of the first water outlet, the circulating pump, the water filter module, the water flow controller and the ultrapure water outlet.

[0018] As an improvement of the above-mentioned scheme, when the first conductivity detection value is greater than the first threshold value, an alarm information is generated; wherein the first conductivity detection value is the conductivity detection value of the ultrapure water between the water supply port and the first water inlet.

[0019] As an improvement to the above solution, the water filtration module is turned off when the second conductivity detection value is less than the second threshold.

[0020] As an improvement to the above scheme, when the electrochemical energy conversion device starts working, the control method of the ultrapure water purification system further includes:

[0021] When the first liquid level switch is open and the second liquid level switch is closed, water injection into the water storage tank is stopped, and the circulation loop and the output flow path are opened.

[0022] When the second conductivity detection value is greater than the second threshold, the water filtration module is turned on and the output flow path is kept open.

[0023] As an improvement to the above solution, the control method of the ultrapure water purification system further includes:

[0024] When the first liquid level switch and the second liquid level switch are both off, water is injected into the water storage tank through the water supply port, and at the same time the circulation loop and the output flow path are opened, and the water filtration module is turned on.

[0025] As an improvement to the above solution, the ultrapure water purification system further includes a first temperature detection module and a second temperature detection module. Then, the first conductivity detection value and the second conductivity detection value are conductivity detection values ​​after temperature compensation.

[0026] Compared with the prior art, the beneficial effects of the ultrapure water purification system and its control method provided in the embodiments of the present invention are as follows:

[0027] The ultrapure water purification system provided in this embodiment of the invention includes a water supply port, a first conductivity detection module, a second conductivity detection module, a water storage tank, a first level switch, a second level switch, a water filtration module, a water flow controller, a main controller, and an ultrapure water outlet. The first outlet, circulating pump, water filtration module, and second inlet constitute a circulation loop, while the first outlet, circulating pump, water filtration module, water flow controller, and ultrapure water outlet constitute an output flow path. The first conductivity detection module detects the conductivity of the ultrapure water at the output end of the water supply port, and the second conductivity detection module detects the conductivity of the ultrapure water at the output end of the water filtration module. The main controller can control the circulation loop and output loop to open or close based on different conductivity detection values, thereby ensuring that the conductivity of the ultrapure water output to the electrochemical energy conversion device meets the standard and avoiding a reduction in reactor lifespan. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an ultrapure water purification system provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the communication relationship between the modules provided in an embodiment of the present invention. Detailed Implementation

[0030] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] See Figure 1 This is a schematic diagram of an ultrapure water purification system provided in an embodiment of the present invention, including a water supply port 1, a first conductivity detection module 2, a second conductivity detection module 3, a water storage tank 6, a first level switch 7, a second level switch 8, a circulation pump 13, a water filtration module 10, a water flow controller 11, a main controller (not shown in the figure), and an ultrapure water outlet 12; wherein:

[0032] The output end of water supply port 1 is connected to the first inlet 4 of water storage tank 6; the first outlet 9 of water storage tank 6 is connected to the input end of circulation pump 13; the output end of circulation pump 13 is connected to the input end of water filtration module 10; the output end of water filtration module 10 is connected to the second inlet 5 of water storage tank 6 and the input end of water flow controller 11 respectively; the output end of water flow controller 11 is connected to the input end of ultrapure water outlet 12; the output end of ultrapure water outlet 12 is connected to the input end of electrochemical energy conversion device (not shown in the figure); the first conductivity detection module 2 is located between water supply port 1 and the first inlet 4; the second conductivity detection module 3 is located between the output end of water filtration module 10 and the second inlet 5; the first liquid level switch 7 is located near the top of water storage tank 6, and the second liquid level switch 8 is located near the bottom of water storage tank 6.

[0033] It is worth noting that, Figure 1 The illustration shows only one possible arrangement of the water outlet and inlet. In practical applications, the water outlet can also be located at the top of the water storage tank 6, and the water inlet at the bottom. The specific arrangement is not limited here. Compared to placing the water outlet at the top of the water storage tank 6, this embodiment of the invention places the water outlet at the bottom of the water storage tank 6. This eliminates the need for an additional water pump and pipe; ultrapure water can flow out of the water storage tank 6 solely by gravity. Furthermore, regardless of the water level, the ultrapure water automatically flows out through the bottom outlet.

[0034] It is understood that the liquid level switch is in a closed state when in contact with water and in an open state when not in contact with water. In this embodiment of the invention, by setting a first liquid level switch 7 and a second liquid level switch 8 at different heights of the water storage tank 6, the water level in the water storage tank 6 can be monitored in real time, and the working state of the ultrapure water purification system can be controlled according to the water level.

[0035] Furthermore, the first conductivity detection module 2 is located between the water supply port 1 and the first inlet 4, and is used to collect the conductivity σ1 of the ultrapure water from the water supply port 1; the second conductivity detection module 3 is located between the output end of the water filtration module 10 and the second inlet 5, and is used to collect the conductivity σ2 of the ultrapure water output by the water filtration module 10. This embodiment of the invention, by setting two conductivity detection modules, can detect both the initial conductivity of the ultrapure water flowing into the ultrapure water purification system and the conductivity of the ultrapure water after filtration, thereby enabling control of each module based on the conductivity of the ultrapure water at different locations, and improving the ultrapure water purification efficiency.

[0036] Furthermore, in this embodiment of the invention, the first outlet 9, the circulating pump 13, the water filtration module 10, and the second inlet 5 constitute a circulation loop, while the first outlet 9, the circulating pump 13, the water filtration module 10, the water flow controller 11, and the ultrapure water outlet 12 constitute an output flow path. The main controller can control the opening and closing of the circulation loop by starting and stopping the circulating pump 13, and can control the opening and closing of the output flow path by controlling the opening and closing of the water flow controller 11. By separately setting up the circulation loop and the output flow path, this embodiment of the invention can filter ultrapure water through the circulation loop, and when the conductivity of the ultrapure water meets the requirements, it can output the ultrapure water to the electrochemical energy conversion device through the output flow path. This can stably provide ultrapure water with the required conductivity to the electrochemical energy conversion device to participate in the reaction, avoiding a reduction in the reactor's lifespan.

[0037] Specifically, water supplied by the ultrapure water preparation system flows into the ultrapure water purification system through water supply port 1. The main controller monitors the water level in the tank through the first level switch 7 and the second level switch 8, monitors the conductivity σ1 of the ultrapure water from water supply port 1 through the first conductivity detection module 2, and monitors the conductivity σ2 of the ultrapure water in the circulation loop through the second conductivity detection module 3. Based on the water level in the tank, conductivity σ1, and conductivity σ2, the controller controls the water supply, filtration, and output in the ultrapure water purification system. For example, when conductivity σ2 is too high, the circulation pump 13 is turned on to open the circulation loop, the water flow controller 11 is turned off to close the output flow path, and the water filtration module 10 is turned on to filter the ultrapure water until the conductivity σ2 is less than the preset requirement. Then the water filtration module 10 is turned off and the water flow controller 11 is turned on, thereby ensuring that the conductivity of the ultrapure water supplied to the electrochemical energy conversion device for reaction meets the requirements.

[0038] Compared with the prior art, the ultrapure water purification system provided in this embodiment of the invention is equipped with a circulation loop and an output flow path, which enables the conductivity monitoring and filtration of ultrapure water. The ultrapure water is then output to the electrochemical energy conversion device only after its conductivity meets the requirements, thereby reducing the conductivity of the ultrapure water in the electrochemical energy conversion device and avoiding a reduction in the reactor's lifespan.

[0039] As one alternative implementation, the water filtration module 10 is an EDI module.

[0040] It is worth noting that the EDI (Electrodeionization) module can remove anions and cations from the ultrapure water flowing through it during operation, thereby reducing the conductivity of the ultrapure water. Compared to using a deionization column to filter ultrapure water, the EDI module used in this embodiment of the invention can be recycled and reused without frequent replacement, thus improving the ultrapure water purification efficiency and greatly reducing purification costs.

[0041] As one of the alternative implementation methods,

[0042] The ultrapure water purification system also includes a first temperature detection module and a second temperature detection module, wherein:

[0043] The first temperature detection module is located between the water supply port 1 and the first water inlet 4;

[0044] The second temperature detection module is located between the output end of the water filtration module 10 and the second water inlet 5;

[0045] Furthermore, both the first temperature detection module and the second temperature detection module are connected to the main controller for communication.

[0046] It is worth noting that the conductivity of aqueous solutions is significantly affected by temperature. Common conductivity detection modules typically collect data at room temperature (25°C). Excessively high or low ambient temperatures will lead to large errors in the conductivity data. Therefore, this embodiment of the invention also includes a first temperature detection module and a second temperature detection module. By using these modules, the main controller can perform temperature compensation on the conductivity value detected by the first conductivity detection module 2 based on the first temperature value detected by the first module, and on the conductivity value detected by the second conductivity detection module 3 based on the second temperature value detected by the second module. This eliminates the influence of ambient temperature changes on the conductivity value, making the conductivity measurement results more accurate and further ensuring the quality of ultrapure water purification.

[0047] As one of the optional implementation methods, the main controller is communicatively connected to the first conductivity detection module 2, the second conductivity detection module 3, the first liquid level switch 7, the second liquid level switch 8, the water filtration module 10, the circulating pump 13, and the water flow controller 11.

[0048] See Figure 2 This is a schematic diagram illustrating the communication relationships between the modules provided in an embodiment of the present invention. Figure 2 It can be seen that the first liquid level switch 7 and the second liquid level switch 8 have a one-way communication connection with the main controller. This is because the liquid level switches only need to send their own on / off status to the main controller, without needing to adjust their own status according to the instructions of the main controller. The circulating pump 13 also has a one-way communication connection with the main controller. The difference is that the circulating pump 13 needs to receive the instructions issued by the main controller and adjust its own working status according to the instructions. The other modules need to achieve a two-way communication connection with the main controller. For example, the conductivity detection module not only needs to send the detection value to the main controller, but also needs to determine whether to start detection according to the instructions of the main controller. The water filtration module 10 and the water flow controller 11 not only need to send their own working status to the main controller, but also need to receive the instructions of the main controller to realize the opening and closing.

[0049] Compared with the prior art, the ultrapure water purification system provided in this embodiment of the invention includes a water supply port 1, a first conductivity detection module 2, a second conductivity detection module 3, a water storage tank 6, a first liquid level switch 7, a second liquid level switch 8, a water filtration module 10, a water flow controller 11, a main controller, and an ultrapure water outlet 12. The first water outlet 9, the circulation pump 13, the water filtration module 10, and the second water inlet 5 constitute a circulation loop, while the first water outlet 9, the circulation pump 13, the water filtration module 10, the water flow controller 11, and the ultrapure water outlet 12 constitute an output flow path. The first conductivity detection module 2 is used to detect the conductivity of the ultrapure water at the output end of the water supply port 1, and the second conductivity detection module 3 is used to detect the conductivity of the ultrapure water at the output end of the water filtration module 10. The main controller can control the circulation loop and the output loop to open or close according to different conductivity detection values, thereby ensuring that the conductivity of the ultrapure water output to the electrochemical energy conversion device meets the standard, thus avoiding a reduction in the reactor's lifespan.

[0050] This invention also provides a control method for an ultrapure water purification system based on any of the above embodiments. The control method for the ultrapure water purification system is executed by a main controller. When the electrochemical energy conversion device is not in operation, the control method for the ultrapure water purification system includes:

[0051] When both the first liquid level switch 7 and the second liquid level switch 8 are disconnected, water is injected into the water storage tank 6 through the water supply port 1, and the circulation loop and output flow path are closed.

[0052] When the first liquid level switch 7 is open and the second liquid level switch 8 is closed, the water filtration module 10 is turned on and the circulation loop is opened.

[0053] When both the first liquid level switch 7 and the second liquid level switch 8 are closed, water injection into the water storage tank 6 will stop.

[0054] When the second conductivity detection value is less than the second threshold, the output flow path is opened;

[0055] The second conductivity detection value is the conductivity detection value of the ultrapure water in the circulation loop; the circulation loop consists of the first outlet 9, the circulation pump 13, the water filtration module 10, and the second inlet 5; the output flow route consists of the first outlet 9, the circulation pump 13, the water filtration module 10, the water flow controller 11, and the ultrapure water outlet 12.

[0056] It is worth noting that the electrochemical energy conversion device is not yet operational, meaning the fuel cell is not generating electricity and the electrolyzer is not producing hydrogen. When the first level switch 7 is open and the second level switch 8 is open, the system determines that the water tank 6 is low on water and injects ultrapure water into the water tank 6 through the control water supply port 1, but temporarily does not open the circulation loop and output flow path. When the first level switch 7 is open and the second level switch 8 is closed, the system determines that the water tank 6 has some water, opens the control circulation loop and activates the water filtration module 10, allowing the ultrapure water in the water tank 6 to enter the circulation loop and have its conductivity reduced by the water filtration module 10 before flowing back into the water tank 6. The ultrapure water circulation is activated before the water tank 6 is full. To effectively improve system efficiency, during this stage, the conductivity of the water in the circulation loop and water tank 6 has not yet met the requirements, so the output flow path needs to be kept closed. When the first level switch 7 is closed and the second level switch 8 is closed, the system determines that the water tank 6 is full and will control the water supply port 1 to stop supplying water to the water tank 6. The ultrapure water in the water tank 6 continues to be filtered in the circulation loop to reduce conductivity. When the second conductivity detection module 3 detects that the conductivity σ2 of the ultrapure water in the circulation loop meets the requirements, for example, when σ2 < 0.055 uS / CM (microsiemens per centimeter), the system determines that the water quality is qualified and will control the output flow path to open to supply ultrapure water to the reaction zone of the electrochemical energy conversion device.

[0057] The above-mentioned circulation method has a high degree of automation and good reliability, which can ensure a stable supply of ultrapure water with the required conductivity to the electrochemical energy conversion device to participate in the reaction, thus avoiding a reduction in the reactor's lifespan.

[0058] As one of the optional implementation methods, an alarm message is generated when the first conductivity detection value is greater than the first threshold; wherein, the first conductivity detection value is the conductivity detection value of ultrapure water between the water supply port 1 and the first water inlet 4.

[0059] It is worth noting that, to further ensure the ultrapure water has low conductivity, this embodiment of the invention includes a first conductivity detection module 2 between the water supply port 1 and the first inlet port 4 to detect the conductivity of the ultrapure water flowing out of the water supply port 1. When the detection value of the first conductivity detection module 2 is too high, an alarm message is generated. For example, an alarm module can be set up and controlled by the main controller to trigger an alarm. Furthermore, when the detection value of the first conductivity detection module 2 is detected to be too high, the water supply port 1 and the first inlet port 4 can also be shut off.

[0060] In this embodiment of the invention, a first conductivity detection module 2 is set near the output end of the water supply port 1. When the conductivity of the ultrapure water supplied by the water supply port 1 is too high, it can be detected in time and relevant measures can be taken to prevent the ultrapure water with excessive conductivity from entering the water storage tank 6 and causing pollution.

[0061] It is worth noting that although the water filtration module 10 provided in this embodiment of the invention can purify ultrapure water, when the conductivity of ultrapure water is high to a certain extent, the purification efficiency and quality of the water filtration module 10 may no longer meet the requirements. In this case, the preferred approach is to generate an alarm message to prevent ultrapure water with excessive conductivity from entering the water storage tank 6 from the source, and to replace the ultrapure water entering the water supply port 1.

[0062] As one alternative implementation, the water filtration module 10 is turned off when the second conductivity detection value is less than the second threshold.

[0063] When σ2 < the second conductivity threshold, the conductivity of the ultrapure water in the storage tank 6 meets the standard, and no further filtration is required. At this time, turning off the water filtration module 10 can effectively save energy. It is worth noting that even if the water filtration module 10 is turned off, ultrapure water can still flow through the water filtration module 10, but the water filtration module 10 will not perform a filtration function at this time.

[0064] As one optional implementation method, after the electrochemical energy conversion device starts working, the control method of the ultrapure water purification system further includes:

[0065] When the first level switch 7 is open and the second level switch 8 is closed, water injection into the water storage tank 6 is stopped, and the circulation loop and output flow path are opened.

[0066] When the second conductivity detection value is greater than the second threshold, the water filtration module 10 is turned on and the output flow path is kept open.

[0067] It is worth noting that the start of operation of the electrochemical energy conversion device is equivalent to the start of power generation by the fuel cell or the start of hydrogen production by the electrolyzer. While the electrochemical energy conversion device is already operational, the ultrapure water purification system is already supplying ultrapure water with the required conductivity to the device. Although the ultrapure water in the storage tank 6 will continuously decrease, the supply of water from the water supply port 1 to the storage tank 6 is suspended before the second level switch 8 is opened. This ensures a stable supply of ultrapure water with the required conductivity to the electrochemical energy conversion device for reaction, preventing a reduction in reactor lifespan. Furthermore, when the second conductivity detection value is greater than the second threshold, the water filtration module 10 is activated. However, since the electrochemical energy conversion device has already started operating, the output flow path remains open while filtering ultrapure water to ensure the supply of ultrapure water to the device and prevent it from malfunctioning due to water shortage. When the second conductivity detection value is less than the second threshold, the water filtration module 10 is deactivated.

[0068] As one optional implementation method, the control method for the ultrapure water purification system further includes:

[0069] When the first liquid level switch 7 is open and both the second liquid level switch 8 are open, water is injected into the water storage tank 6 through the water supply port 1, and at the same time the circulation loop and the output flow path are opened, and the water filtration module 10 is turned on.

[0070] It is worth noting that when the first level switch 7 and the second level switch 8 are both open, the system determines that the water level in the storage tank 6 is too low and needs to open the water supply port 1 to replenish ultrapure water. Although the conductivity of the ultrapure water in the tank will be increased after replenishment, the electrochemical energy conversion device needs to maintain its working state, and the output path also needs to maintain the output of ultrapure water. At this time, the water filtration module 10 needs to be turned on to filter the ultrapure water in the circulation system to ensure that the conductivity of the ultrapure water in the circulation system decreases as quickly as possible, reducing the adverse impact on the reactor lifespan caused by the process of replenishing ultrapure water in the storage tank 6. Furthermore, when the first level switch 7 and the second level switch 8 are both closed, the water supply port 1 stops adding water to the storage tank 6; when the second conductivity detection module 3 detects that the conductivity σ2 of the ultrapure water in the circulation loop is less than the second conductivity threshold, the water filtration module 10 is turned off.

[0071] As one optional implementation, the ultrapure water purification system further includes a first temperature detection module and a second temperature detection module. In this case, the first conductivity detection value and the second conductivity detection value are conductivity detection values ​​after temperature compensation.

[0072] Compared with the prior art, the ultrapure water purification system provided in this embodiment of the invention includes a water supply port 1, a first conductivity detection module 2, a second conductivity detection module 3, a water storage tank 6, a first liquid level switch 7, a second liquid level switch 8, a water filtration module 10, a water flow controller 11, a main controller, and an ultrapure water outlet 12. The first water outlet 9, the circulation pump 13, the water filtration module 10, and the second water inlet 5 constitute a circulation loop, while the first water outlet 9, the circulation pump 13, the water filtration module 10, the water flow controller 11, and the ultrapure water outlet 12 constitute an output flow path. The first conductivity detection module 2 is used to detect the conductivity of the ultrapure water at the output end of the water supply port 1, and the second conductivity detection module 3 is used to detect the conductivity of the ultrapure water at the output end of the water filtration module 10. The main controller can control the opening or closing of the circulation loop and the output loop according to different conductivity detection values ​​and the states of the two liquid level switches, thereby ensuring that the conductivity of the ultrapure water output to the electrochemical energy conversion device meets the standard and avoiding a reduction in reactor lifespan.

[0073] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A control method for an ultrapure water purification system, characterized in that, The control method of the ultrapure water purification system is executed by the main controller. When the electrochemical energy conversion device is not in operation, the control method of the ultrapure water purification system includes: When both the first and second level switches are off, water is injected into the water storage tank through the water supply port, and the circulation loop and output flow path are closed. When the first liquid level switch is open and the second liquid level switch is closed, the water filtration module is turned on and the circulation loop is opened. When both the first liquid level switch and the second liquid level switch are closed, water filling into the water storage tank is stopped; When the second conductivity detection value is less than the second threshold, the output flow path is turned on; Wherein, the second conductivity detection value is the conductivity detection value of the ultrapure water in the circulation loop; the circulation loop consists of a first outlet, a circulation pump, the water filtration module, and a second inlet; the output flow route consists of the first outlet, the circulation pump, the water filtration module, the water flow controller, and the ultrapure water outlet; Once the electrochemical energy conversion device starts operating, the control method for the ultrapure water purification system further includes: When the first liquid level switch is open and the second liquid level switch is closed, water injection into the water storage tank is stopped, and the circulation loop and the output flow path are opened. When the second conductivity detection value is greater than the second threshold, the water filtration module is turned on and the output flow path is kept open. When the first liquid level switch and the second liquid level switch are both off, water is injected into the water storage tank, the circulation loop and the output flow path are opened, and the water filtration module is activated.

2. The control method for the ultrapure water purification system as described in claim 1, characterized in that, An alarm message is generated when the first conductivity detection value is greater than the first threshold; wherein, the first conductivity detection value is the conductivity detection value of the ultrapure water between the water supply port and the first water inlet.

3. The control method for the ultrapure water purification system as described in claim 1, characterized in that, When the second conductivity detection value is less than the second threshold, the water filtration module is turned off.

4. The control method for the ultrapure water purification system as described in claim 2, characterized in that, The ultrapure water purification system further includes a first temperature detection module and a second temperature detection module. Therefore, the first conductivity detection value and the second conductivity detection value are conductivity detection values ​​after temperature compensation.

5. An ultrapure water purification system, employing the control method for the ultrapure water purification system as described in claim 1, characterized in that, Includes a water supply outlet, a first conductivity detection module, a second conductivity detection module, a water storage tank, a first level switch, a second level switch, a circulating pump, a water filtration module, a water flow controller, a main controller, and an ultrapure water outlet; wherein: The output end of the water supply port is connected to the first inlet of the water storage tank; the first outlet of the water storage tank is connected to the input end of the circulation pump; the output end of the circulation pump is connected to the input end of the water filtration module; the output end of the water filtration module is connected to the second inlet of the water storage tank and the input end of the water flow controller; the output end of the water flow controller is connected to the input end of the ultrapure water outlet; the output end of the ultrapure water outlet is connected to the input end of the electrochemical energy conversion device; the first conductivity detection module is located between the water supply port and the first inlet; the second conductivity detection module is located between the output end of the water filtration module and the second inlet; the first liquid level switch is located near the top of the water storage tank, and the second liquid level switch is located near the bottom of the water storage tank.

6. The ultrapure water purification system as described in claim 5, characterized in that, The water filtration module is an EDI module.

7. The ultrapure water purification system as described in claim 5, characterized in that, The ultrapure water purification system also includes a first temperature detection module and a second temperature detection module, wherein: The first temperature detection module is located between the water supply port and the first water inlet; The second temperature detection module is located between the output end of the water filtration module and the second water inlet; Furthermore, both the first temperature detection module and the second temperature detection module are communicatively connected to the main controller.

8. The ultrapure water purification system as described in claim 5, characterized in that, The main controller is communicatively connected to the first conductivity detection module, the second conductivity detection module, the first liquid level switch, the second liquid level switch, the water filtration module, the circulating pump, and the water flow controller.

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