PEM electrolyzer cathode separation system conductivity on-line detection device

Abstract

The utility model discloses a PEM electrolytic cell cathode separation system conductivity on -line detection device relates to PEM electrolytic cell cathode separation system conductivity on -line detection device technical field, for solving the problem that the cathode catalyst of existing PEM electrolytic cell will have the falling phenomenon under the continuous working condition, leads to the conductivity of cathode separation system condensate water improvement. The cathode steam -water separator is installed one end at the cathode heat exchanger, the upper end of cathode steam -water separator is provided with gas export, the lower end of cathode steam -water separator is provided with cathode separation water discharge needle valve.

Description

Technical Field

[0001] This utility model relates to the technical field of online conductivity detection device for PEM electrolytic cell cathode separation system, specifically an online conductivity detection device for PEM electrolytic cell cathode separation system. Background Technology

[0002] The online conductivity detection device for the cathode separation system of PEM electrolyzer can detect the conductivity of the cathode-separated water in PEM electrolyzer in real time. The test data can help R&D designers to further study the problem of catalyst shedding from the cathode of the electrolyzer, and can also determine whether the cathode-separated water can be recycled.

[0003] For example, the Chinese authorized patent, with publication number CN218951509U, entitled "(A PEM Water Electrolysis Hydrogen Production System Cathode Side Permeation Water Recovery Device)," includes: a PEM hydrogen production electrolyzer; the cathode outlet of the PEM hydrogen production electrolyzer is connected to the hot flow inlet of a hydrogen cooler via a first pipeline; the hot flow outlet of the hydrogen cooler is connected to the inlet of a first gas-liquid separator via a second pipeline; the liquid phase outlet of the first gas-liquid separator is connected to the inlet of a filter; the outlet of the filter is connected to the inlet of a deionizer; the outlet of the deionizer is connected to the inlet of a second gas-liquid separator via a third pipeline; an online conductivity meter is installed on the third pipeline; a second hydrogen outlet shut-off valve is installed at the gas phase outlet of the second gas-liquid separator; the liquid phase outlet of the second gas-liquid separator is connected to the inlet of a water pump via a fourth pipeline; and the outlet of the water pump is connected to the anode inlet of the PEM hydrogen production electrolyzer via a fifth pipeline. This utility model has the advantage of high safety in use. However, existing PEM electrolyzers experience catalyst shedding at the cathode during continuous operation, leading to increased conductivity of the condensate in the cathode separation system. Therefore, this does not meet current requirements. To address this issue, we propose an online conductivity detection device for the cathode separation system of a PEM electrolyzer. Utility Model Content

[0004] The purpose of this invention is to provide an online conductivity detection device for the cathode separation system of a PEM electrolyzer, in order to solve the problem mentioned in the background art that the cathode catalyst in the existing PEM electrolyzer will fall off under continuous operation, resulting in an increase in the conductivity of the condensate water in the cathode separation system.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an online conductivity detection device for a PEM electrolytic cell cathode separation system, comprising: a PEM electrolytic cell, wherein a cathode heat exchanger is provided at the cathode outlet of the PEM electrolytic cell; Also includes: A cathode steam-water separator is installed at one end of the cathode heat exchanger. The upper end of the cathode steam-water separator is provided with a gas outlet, and the lower end of the cathode steam-water separator is provided with a cathode separated water discharge needle valve.

[0006] Preferably, a cathode temperature sensor is provided between the cathode steam-water separator and the cathode heat exchanger, and a secondary cooling water inlet and a secondary cooling water outlet are respectively provided at the upper and lower ends of the cathode heat exchanger.

[0007] Preferably, an upper liquid level for the cathode steam-water separator is provided on the upper side of the outer side of the cathode steam-water separator, and a lower liquid level for the cathode steam-water separator is provided on the lower side of the outer side of the cathode steam-water separator.

[0008] Preferably, a cathode separation water conductivity meter is provided on one side of the lower end of the cathode steam-water separator.

[0009] Preferably, a cathode separation water discharge needle valve and a cathode separation water supply solenoid valve are provided on the outside of one end of the cathode separation water discharge needle valve.

[0010] Preferably, the cathode water conductivity meter is electrically connected to the cathode water discharge needle valve, the cathode water direct discharge solenoid valve, and the cathode water supply solenoid valve.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the use of a simple and low-cost component structure, can effectively implement real-time online detection of the conductivity of the cathode separation system of a PEM electrolyzer. The test data can help R&D designers to further study the problem of cathode catalyst shedding in the electrolyzer, and can also determine whether the separated water can be recycled, thereby avoiding the problem that the cathode catalyst in the existing PEM electrolyzer will shed under continuous operation, which leads to an increase in the conductivity of the condensate water in the cathode separation system.

[0012] 2. It can also be used in AEM electrolyzer applications, online detection of the conductivity of the cathode water separated from the tail of the AEM electrolyzer, research on the detachment of the cathode catalyst in the AEM electrolyzer, and to determine whether the cathode water separated from the AEM electrolyzer can be recycled and reused. If the conductivity of the cathode water separated from the AEM electrolyzer meets the conductivity requirements of pure water for AEM electrolysis, it can be recycled and reused, reducing the operating cost of the AEM electrolyzer. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall process of this utility model; In the diagram: 100, Cathode heat exchanger; 200, Cathode temperature sensor; 300, Cathode steam-water separator; 400, Upper liquid level of the cathode steam-water separator; 500, Lower liquid level of the cathode steam-water separator; 600, Cathode separated water conductivity meter; 700, Cathode separated water discharge needle valve; 800, Cathode separated water direct discharge solenoid valve; 900, Cathode separated water supply to the makeup water tank solenoid valve; 110, PEM electrolytic cell. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] Please see Figure 1 The present invention provides an embodiment of an online conductivity detection device for a PEM electrolytic cell cathode separation system, comprising: a PEM electrolytic cell 110, wherein a cathode heat exchanger 100 is provided at the cathode outlet of the PEM electrolytic cell 110. Also includes: A cathode steam-water separator 300 is installed at one end of the cathode heat exchanger 100. A gas outlet is located at the upper end of the cathode steam-water separator 300, and a cathode separated water discharge needle valve 700 is located at the lower end. A cathode temperature sensor 200 is installed between the cathode steam-water separator 300 and the cathode heat exchanger 100. Secondary cooling water inlet and outlet are located at the upper and lower ends of the cathode heat exchanger 100, respectively. A cathode steam-water separator upper liquid level 400 is located on the upper side of the outer side of the cathode steam-water separator 300. A cathode steam-water separator lower liquid level 500 is provided on the lower side of the outer side of the cathode steam-water separator 300. A cathode separation water conductivity meter 600 is provided on one side of the lower end of the cathode steam-water separator 300. A cathode separation water direct discharge solenoid valve 800 and a cathode separation water supply to the makeup water tank solenoid valve 900 are provided on the outside of one end of the cathode separation water discharge needle valve 700. The cathode separation water conductivity meter 600 is electrically connected to the cathode separation water discharge needle valve 700, the cathode separation water direct discharge solenoid valve 800 and the cathode separation water supply to the makeup water tank solenoid valve 900.

[0017] Working Principle: During operation, the high-temperature, high-humidity hydrogen gas and a small amount of liquid water generated at the cathode of the PEM electrolysis cell 110 first enter the cathode heat exchanger 100 for cooling and condensation. The gas temperature is then detected by the cathode temperature sensor 200. The cooled and condensed gas-liquid mixture enters the cathode vapor-liquid separator 300, where gas and liquid stratification occurs. The gas is discharged directly from the top of the cathode vapor-liquid separator 300, while the liquid is temporarily stored within it. Liquid levels are monitored at the upper liquid level 400 and the lower liquid level 500, and conductivity is also measured by the cathode water conductivity meter 600. Discharge begins when the liquid level reaches the upper liquid level 400 and stops when it reaches the lower liquid level 500. If the conductivity of the cathode-separated water detected by the conductivity meter 600 is lower than 1 μS / cm at 25℃, the solenoid valve 900 for sending the cathode-separated water into the water replenishment tank will be opened to send the discharged electrolyte into the water replenishment tank. If the conductivity of the cathode-separated water detected by the conductivity meter 600 is higher than 1 μS / cm at 25℃, the solenoid valve 800 for direct discharge of the cathode-separated water will be opened to discharge it directly without collection.

[0018] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0019] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An online conductivity detection device for a PEM electrolytic cell cathode separation system, comprising a PEM electrolytic cell (110), wherein a cathode heat exchanger (100) is provided at the cathode outlet of the PEM electrolytic cell (110). Its features are: Also includes: A cathode steam-water separator (300) is installed at one end of the cathode heat exchanger (100). The upper end of the cathode steam-water separator (300) is provided with a gas outlet, and the lower end of the cathode steam-water separator (300) is provided with a cathode separated water discharge needle valve (700). A cathode separated water conductivity meter (600) is provided on one side of the lower end of the cathode steam-water separator (300).

2. The online conductivity detection device for a PEM electrolytic cell cathode separation system according to claim 1, characterized in that: A cathode temperature sensor (200) is provided between the cathode steam-water separator (300) and the cathode heat exchanger (100). The upper and lower ends of the cathode heat exchanger (100) are respectively provided with a secondary cooling water inlet and a secondary cooling water outlet.

3. The online conductivity detection device for a PEM electrolytic cell cathode separation system according to claim 1, characterized in that: The upper side of the outer side of the cathode steam-water separator (300) is provided with a cathode steam-water separator upper liquid level (400), and the lower side of the outer side of the cathode steam-water separator (300) is provided with a cathode steam-water separator lower liquid level (500).

4. The online conductivity detection device for a PEM electrolytic cell cathode separation system according to claim 1, characterized in that: The cathode separation water discharge needle valve (700) is externally equipped with a cathode separation water direct discharge solenoid valve (800) and a cathode separation water supply to the water replenishment tank solenoid valve (900).

5. The online conductivity detection device for a PEM electrolytic cell cathode separation system according to claim 1, characterized in that: The cathode separation water conductivity meter (600) is electrically connected to the cathode separation water discharge needle valve (700), the cathode separation water direct discharge solenoid valve (800), and the cathode separation water supply to the water replenishment tank solenoid valve (900).

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