Ultrapure water purification system and control method thereof

Abstract

The invention discloses an ultrapure water purification system and a control method thereof. The ultrapure water purification system comprises a water supply port, a first conductivity detection module, a second conductivity detection module, a water storage tank, a first liquid level switch, a second liquid level switch, a circulating pump, a water filtering module, a water flow controller, a main controller and an ultrapure water outlet. Wherein the first water outlet, the circulating pump, the water filtering module and the second water inlet form a circulating loop, and the first water outlet, the circulating pump, the water filtering module, the water flow controller and the ultrapure water outlet form an output flow path; the first conductivity detection module is used for detecting the conductivity of the ultrapure water at the output end of the water supply port, and the second conductivity detection module is used for detecting the conductivity of the ultrapure water at the output end of the water filtering 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 the ultrapure water output to the electrochemical energy conversion device reaches the standard, and the reduction of the service life of a reactor is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to an ultrapure water purification system and a control method thereof. Background Art

[0002] Both the fuel cell device and the electrolyzer device are electrochemical energy conversion devices, and ultrapure water is required to participate in the reaction in both the fuel cell device and the electrolyzer device. In the fuel cell device, ultrapure water and gas undergo a high-temperature chemical reaction to achieve gas reforming, while in the electrolyzer device, ultrapure water is used for electrolysis to produce hydrogen. Therefore, the electrochemical energy conversion device needs to be equipped with an ultrapure water preparation system to prepare and provide ultrapure water; however, the ultrapure water prepared by the ultrapure water preparation system generally flows to a water storage tank for buffering before participating in the reaction of the electrochemical energy conversion device. In this process, gases such as oxygen and carbon dioxide are easily slightly soluble in ultrapure water, resulting in ultrapure water being contaminated and conductivity becoming higher, which will eventually reduce the life of the reactor (battery stack or electrolyzer) of the electrochemical energy conversion device. Summary of the invention

[0003] The purpose of the embodiment of the present invention is to provide an ultrapure water purification system and a control method thereof, which can filter and detect the conductivity of ultrapure water, thereby significantly reducing the conductivity of ultrapure water entering the electrochemical energy conversion device and avoiding reducing the life of the reactor.

[0004] To achieve the above-mentioned object, an embodiment of the present invention provides an ultrapure water purification system, comprising a water supply port, a first conductivity detection module, a second conductivity detection module, a water storage tank, a first liquid level switch, a second liquid level switch, a circulation pump, a water filter module, a water flow controller, a main controller and an ultrapure water outlet; wherein:

[0005] The output end of the water supply port is connected to the first water inlet of the water tank; the first water outlet of the water 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 respectively connected to the second water inlet of the water 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 arranged between the water supply port and the first water inlet; the second 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 near the top of the water tank, and the second liquid level switch is arranged near the bottom of the water tank.

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

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

[0008] The first temperature detection module is disposed 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 filtration module and the second water inlet;

[0010] Furthermore, the first temperature detection module and the second temperature detection module are both communicatively connected to the main controller.

[0011] As an improvement of the above solution, 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 circulation pump, and the water flow controller respectively.

[0012] To achieve the above purpose, an embodiment of the present invention further provides a control method for an ultrapure water purification system based on any of the above embodiments, wherein the control method for the ultrapure water purification system is executed by the main controller. When the electrochemical energy conversion device does not start working, the control method for the ultrapure water purification system includes:

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

[0014] When the first liquid level switch is opened and the second liquid level switch is closed, turning on the water filter module and opening the circulation loop;

[0015] When the first liquid level switch and the second liquid level switch are both closed, stopping filling water into the water storage tank;

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

[0017] Wherein, the second conductivity detection value is the conductivity detection value of the ultrapure water in the circulation loop; the circulation loop is composed of the first water outlet, the circulation pump, the water filtration module and the second water inlet; the output flow route is composed of the first water outlet, the circulation pump, the water filtration module, the water flow controller and the ultrapure water outlet.

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

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

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

[0021] When the first liquid level switch is opened and the second liquid level switch is closed, filling water 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 value, the water filtration module is turned on and the output flow path is kept open.

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

[0024] When the first liquid level switch is disconnected and the second liquid level switch is disconnected, water is injected into the water tank through the water supply port, the circulation loop and the output flow path are opened, and the water filter module is turned on.

[0025] As an improvement of the above solution, the ultrapure water purification system further includes a first temperature detection module and a second temperature detection module, and 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 ultrapure water purification system and control method provided by the embodiments of the present invention have the following beneficial effects:

[0027] The ultrapure water purification system provided by the embodiment of the present invention includes a water supply port, a first conductivity detection module, a second conductivity detection module, a water storage tank, a first liquid level switch, a second liquid level switch, a water filtration module, a water flow controller, a main controller and an ultrapure water outlet; wherein, the first water outlet, a circulation pump, a water filtration module and the second water inlet constitute a circulation loop, and the first water outlet, the circulation pump, the water filtration module, the water flow controller and the ultrapure water outlet constitute an output flow path; the first conductivity detection module is used to detect the conductivity of the ultrapure water at the output end of the water supply port, and the second conductivity detection module is used to detect the conductivity of the ultrapure water at the output end of the water filtration module; the main controller can control the circulation loop and the output loop to be opened or closed according to different conductivity detection values, so that the conductivity of the ultrapure water output to the electrochemical energy conversion device meets the standard, thereby avoiding reducing the life of the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 2 It is a schematic diagram of the communication relationship between the modules provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1 , is a schematic diagram of an ultrapure water purification system provided by an embodiment of the present invention, comprising 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 circulating pump 13, a water filter 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 the water supply port 1 is connected to the first water inlet 4 of the water tank 6; the first water outlet 9 of the water tank 6 is connected to the input end of the circulation pump 13; the output end of the circulation pump 13 is connected to the input end of the water filtration module 10; the output end of the water filtration module 10 is respectively connected to the second water inlet 5 of the water tank 6 and the input end of the water flow controller 11; the output end of the water flow controller 11 is connected to the input end of the ultrapure water outlet 12; the output end of the ultrapure water outlet 12 is connected to the input end of the electrochemical energy conversion device (not shown in the figure); the first conductivity detection module 2 is arranged between the water supply port 1 and the first water inlet 4; the second conductivity detection module 3 is arranged between the output end of the water filtration module 10 and the second water inlet 5; the first liquid level switch 7 is arranged near the top of the water tank 6, and the second liquid level switch 8 is arranged near the bottom of the water tank 6.

[0033] It is worth mentioning that Figure 1 The figure shows only one arrangement of the water outlet and the water inlet. In practical applications, the water outlet can also be arranged at the top of the water storage tank 6, and the water inlet can be arranged at the bottom of the water storage tank 6. The specific arrangement is not limited here. Compared with the arrangement of the water outlet at the top of the water storage tank 6, the embodiment of the present invention arranges the water outlet at the bottom of the water storage tank 6, and does not need to set up an additional water pump and water pump pipe. Ultrapure water can flow out of the water storage tank 6 by gravity, and no matter how high or low the water level is, the ultrapure water can automatically flow out through the water outlet at the bottom.

[0034] It can be understood that the liquid level switch will be in a closed state when it contacts water and in an open state when it does not contact water. The embodiment of the present invention can monitor the water level state in the water tank 6 in real time by respectively setting the first liquid level switch 7 and the second liquid level switch 8 at different heights of the water tank 6, and further control the working state of the ultrapure water purification system according to the water level state.

[0035] Furthermore, the first conductivity detection module 2 is provided between the water supply port 1 and the first water 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 provided between the output end of the water filtration module 10 and the second water inlet 5, and is used to collect the conductivity σ2 of the ultrapure water output by the water filtration module 10. The embodiment of the present invention can detect the initial conductivity of the ultrapure water flowing into the ultrapure water purification system and the conductivity of the ultrapure water after filtration by providing two conductivity detection modules, so that each module can be controlled in combination with the conductivity of the ultrapure water at different positions, thereby improving the ultrapure water purification efficiency.

[0036] Furthermore, the first water outlet 9, the circulation pump 13, the water filtration module 10 and the second water inlet 5 of the embodiment of the present invention constitute a circulation loop, and 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 main controller can control the opening and closing of the circulation loop by starting and stopping the circulation 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. The embodiment of the present invention can filter ultrapure water through the circulation loop by separately setting the circulation loop and the output flow path, and output the ultrapure water to the electrochemical energy conversion device through the output flow path when the conductivity of the ultrapure water meets the requirements, so that the ultrapure water with conductivity meeting the requirements can be stably provided to the electrochemical energy conversion device to participate in the reaction, thereby avoiding the reduction of the life of the reactor.

[0037] Specifically, water supplied by the ultrapure water preparation system flows into the ultrapure water purification system through the water supply port 1, the main controller monitors the water level state in the water tank through the first liquid level switch 7 and the second liquid level switch 8, monitors the conductivity σ1 of the ultrapure water from the water supply port 1 through the first conductivity detection module 2, monitors the conductivity σ2 of the ultrapure water in the circulation loop through the second conductivity detection module 3, and controls the supply, filtration and output of water in the ultrapure water purification system according to the water level state in the water tank, the conductivity σ1 and the conductivity σ2. For example, when the 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, and then the water filtration module 10 is turned off and the water flow controller 11 is turned on, so as to ensure that the conductivity of the ultrapure water provided to the electrochemical energy conversion device for participating in the reaction meets the requirements.

[0038] Compared with the prior art, the ultrapure water purification system provided in the embodiment of the present invention is respectively provided with a circulation loop and an output flow path, so that the conductivity of the ultrapure water can be monitored and filtered, and the ultrapure water can be output to the electrochemical energy conversion device after the conductivity of the ultrapure water meets the requirements, thereby reducing the conductivity of the ultrapure water in the electrochemical energy conversion device and avoiding reducing the life of the reactor.

[0039] As an optional 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 in the ultrapure water flowing through the module when working, thereby reducing the conductivity of the ultrapure water. Compared with using a deionization column to filter ultrapure water, the EDI module used in the embodiment of the present invention can be recycled and reused without frequent replacement, thereby improving the ultrapure water purification efficiency and greatly reducing the purification cost.

[0041] As an optional implementation,

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

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

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

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

[0046] It is worth noting that the conductivity of the aqueous solution is greatly affected by temperature. Common conductivity detection modules are all based on room temperature 25°C for data collection. Too high or too low ambient temperature will cause too large an error in the conductivity data. Therefore, the embodiment of the present invention also provides a first temperature detection module and a second temperature detection module. By providing the first temperature detection module and the second temperature detection module, the main controller can perform temperature compensation on the conductivity value detected by the first conductivity detection module 2 according to the first temperature value detected by the first temperature detection module, and perform temperature compensation on the conductivity value detected by the second conductivity detection module 3 according to the second temperature value detected by the second temperature detection module, thereby eliminating the influence of ambient temperature changes on the conductivity value, making the conductivity measurement result more accurate, and further ensuring the quality of ultrapure water purification.

[0047] As one optional implementation, the main controller is respectively communicatively connected with 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 circulation pump 13, and the water flow controller 11.

[0048] See also Figure 2 , is a schematic diagram of the communication relationship of each module provided by 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 relationship with the main controller. This is because the liquid level switch only needs to send its own switch state to the main controller, and does not need to adjust its own state according to the instructions of the main controller; the circulating pump 13 also has a one-way communication connection relationship with the main controller. The difference is that the circulating pump 13 needs to receive instructions issued by the main controller and adjust its own working state according to the instructions; while other modules need to realize 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 state to the main controller, but also need to receive instructions from the main controller to realize opening and closing.

[0049] Compared with the prior art, the ultrapure water purification system provided by the embodiment of the present 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; wherein, the first water outlet 9, a circulation pump 13, the water filtration module 10 and the second water inlet 5 constitute a circulation loop, and 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 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 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 be opened or closed according to different conductivity detection values, so that the conductivity of the ultrapure water output to the electrochemical energy conversion device meets the standard, thereby avoiding reducing the life of the reactor.

[0050] The embodiment of the present invention further 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 does not start working, the control method for the ultrapure water purification system includes:

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

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

[0053] When the first liquid level switch 7 and the second liquid level switch 8 are both closed, the filling of water into the water storage tank 6 is stopped;

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

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

[0056] It is worth noting that the electrochemical energy conversion device has not started to work, that is, the fuel cell has not started to generate electricity, and the electrolytic cell has not started to produce hydrogen. When the first liquid level switch 7 is disconnected and the second liquid level switch 8 is disconnected, the system determines that the water tank 6 is short of water, and controls the water supply port 1 to inject ultrapure water into the water tank 6, but temporarily does not open the circulation loop and the output flow path; when the first liquid level switch 7 is disconnected and the second liquid level switch 8 is closed, the system determines that there is some water in the water tank 6, and controls the circulation loop to open and the water filtration module 10 to open, so that the ultrapure water in the water tank 6 enters the circulation loop and reduces the conductivity under the action of the water filtration module 10, and then flows back to the water tank 6, and the ultrapure water circulation is turned on before the water tank 6 is full. In order to effectively improve the system efficiency, at this stage, the conductivity of the water in the circulation loop and the water tank 6 has not yet met the requirements, and the output flow path needs to be kept closed; when the first liquid level switch 7 is closed and the second liquid level switch 8 is closed, the system determines that the water tank 6 is full of water, and controls the water supply port 1 to stop supplying water to the water tank 6, and the ultrapure water in the water tank 6 continues to be filtered in the circulation loop to reduce the 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<0.055uS / CM (microsiemens per centimeter), the system determines that the water quality is qualified and controls the output flow path to be opened to supply ultrapure water to the reaction area of ​​the electrochemical energy conversion device.

[0057] The above circulation method has a high degree of automation and good reliability, and can ensure the stable supply of ultrapure water with conductivity meeting the requirements to the electrochemical energy conversion device to participate in the reaction, thereby avoiding the reduction of the life of the reactor.

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

[0059] It is worth noting that, in order to further ensure that ultrapure water has low conductivity, the embodiment of the present invention sets a first conductivity detection module 2 between the water supply port 1 and the first water inlet 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, and the alarm module can be controlled by the main controller to alarm. Furthermore, when it is detected that the detection value of the first conductivity detection module 2 is too high, the water supply port 1 and the first water inlet 4 can also be closed.

[0060] The embodiment of the present invention sets a first conductivity detection module 2 near the output end of the water supply port 1. When the conductivity of the ultrapure water provided by the water supply port 1 is too high, it can be discovered in time and relevant measures can be taken to prevent the ultrapure water with too high 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 the embodiment of the present invention can purify ultrapure water, when the conductivity of the ultrapure water reaches a certain level, the purification efficiency and quality of the water filtration module 10 may no longer meet the requirements. At this time, the preferred method should be to generate an alarm message to prevent ultrapure water with excessively high conductivity from entering the water storage tank 6 from the source, and replace the ultrapure water entering the water supply port 1.

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

[0063] When σ2 is less than the second conductivity threshold, the conductivity of the ultrapure water in the water storage tank 6 meets the standard and no filtering is required. At this time, turning off the water filter module 10 can effectively save energy. It is worth noting that even if the water filter module 10 is turned off, ultrapure water can still flow through the water filter module 10, but the water filter module 10 does not play a filtering role at this time.

[0064] As an optional implementation manner, when the electrochemical energy conversion device starts to work, the control method of the ultrapure water purification system further includes:

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

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

[0067] It is worth noting that the electrochemical energy conversion device starts to work, that is, the fuel cell starts to generate electricity or the electrolytic cell starts to produce hydrogen. When the electrochemical energy conversion device is already in working state, the ultrapure water purification system has been outputting ultrapure water with conductivity that meets the standard to the electrochemical energy conversion device. Although the ultrapure water in the water storage tank 6 will continue to decrease, the water supply from the water supply port 1 to the water storage tank 6 is suspended before the second liquid level switch 8 is disconnected, which can ensure the stable supply of ultrapure water with conductivity that meets the requirements to the electrochemical energy conversion device to participate in the reaction, thereby avoiding the reduction of the life of the reactor. Further, when the second conductivity detection value is greater than the second threshold value, the water filtration module 10 is turned on, but because the electrochemical energy conversion device has started to work at this time, the output flow path is kept open while filtering the ultrapure water to ensure the supply of ultrapure water in the electrochemical energy conversion device, thereby avoiding the electrochemical energy conversion device from not being able to work normally due to lack of water; when the second conductivity detection value is less than the second threshold value, the water filtration module 10 is turned off.

[0068] As an optional implementation manner, the control method of the ultrapure water purification system also includes:

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

[0070] It is worth noting that when the first liquid level switch 7 is disconnected and the second liquid level switch 8 is disconnected, the system determines that the water in the water tank 6 is too low and needs to open the water supply port 1 to supplement ultrapure water; although the conductivity of the ultrapure water in the water tank will be improved after supplementation, since the electrochemical energy conversion device needs to maintain a working state, the output of ultrapure water also needs to be maintained in the output flow path. At this time, the water filtration module 10 needs to be opened to filter the ultrapure water in the circulation system to ensure that the conductivity of the ultrapure water in the circulation system is reduced as soon as possible, and to reduce the adverse effects of the process of supplementing ultrapure water in the water tank 6 on the life of the reactor. Further, when the first liquid level switch 7 is closed and the second liquid level switch 8 is closed, the water supply port 1 is stopped from injecting water into the water 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 closed.

[0071] As an optional implementation, the ultrapure water purification system further includes a first temperature detection module and a second temperature detection module, and 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 by the embodiment of the present 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; wherein, the first water outlet 9, a circulation pump 13, the water filtration module 10 and the second water inlet 5 constitute a circulation loop, and 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 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 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 be opened or closed according to different conductivity detection values ​​and the states of the two liquid level switches, so that the conductivity of the ultrapure water output to the electrochemical energy conversion device meets the standard, thereby avoiding reducing the life of the reactor.

[0073] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An ultrapure water purification system, characterized in that: It includes a water supply port, a first conductivity detection module, a second conductivity detection module, a water storage tank, a first liquid level switch, a second liquid level switch, a circulation pump, a water filter 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 water inlet of the water tank; the first water outlet of the water 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 respectively connected to the second water inlet of the water 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 arranged between the water supply port and the first water inlet; the second 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 near the top of the water tank, and the second liquid level switch is arranged near the bottom of the water tank.

2. The ultrapure water purification system according to claim 1, characterized in that: The water filtration module is an EDI module.

3. The ultrapure water purification system according to claim 1, characterized in that: The ultrapure water purification system further comprises a first temperature detection module and a second temperature detection module, wherein: The first temperature detection module is disposed between the water supply port and the first water inlet; The second temperature detection module is arranged between the output end of the water filtration module and the second water inlet; Furthermore, the first temperature detection module and the second temperature detection module are both communicatively connected to the main controller.

4. The ultrapure water purification system according to claim 1, characterized in that: The main controller is respectively 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 circulation pump, and the water flow controller for communication.

5. A control method based on the ultrapure water purification system according to any one of claims 1 to 4, characterized in that: The control method of the ultrapure water purification system is executed by the main controller. When the electrochemical energy conversion device does not start working, the control method of the ultrapure water purification system includes: When both the first liquid level switch and the second liquid level switch are disconnected, water is injected into the water storage tank through the water supply port, and the circulation loop and the output flow path are closed; When the first liquid level switch is opened and the second liquid level switch is closed, turning on the water filter module and opening the circulation loop; When the first liquid level switch and the second liquid level switch are both closed, stopping filling water into the water storage tank; When the second conductivity detection value is less than a second threshold value, opening the output flow path; Wherein, the second conductivity detection value is the conductivity detection value of the ultrapure water in the circulation loop; the circulation loop is composed of the first water outlet, the circulation pump, the water filtration module and the second water inlet; the output flow route is composed of the first water outlet, the circulation pump, the water filtration module, the water flow controller and the ultrapure water outlet.

6. The control method of the ultrapure water purification system according to claim 5, characterized in that: When the first conductivity detection value is greater than a first threshold, an alarm message is generated; wherein the first conductivity detection value is a conductivity detection value of ultrapure water between the water supply port and the first water inlet.

7. The control method of the ultrapure water purification system according to claim 5, characterized in that: When the second conductivity detection value is less than the second threshold, the water filtration module is turned off.

8. The control method of the ultrapure water purification system according to claim 5, characterized in that: When the electrochemical energy conversion device starts to work, the control method of the ultrapure water purification system further includes: When the first liquid level switch is opened and the second liquid level switch is closed, the 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.

9. The control method of the ultrapure water purification system according to claim 8, characterized in that: The control method of the ultrapure water purification system also includes: When the first liquid level switch is disconnected and the second liquid level switch is disconnected, water is injected into the water tank through the water supply port, the circulation loop and the output flow path are opened, and the water filter module is turned on.

10. The control method of the ultrapure water purification system according to claim 6, characterized in that: The ultrapure water purification system further comprises 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.

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