PEM water electrolysis gas production monitoring device and PEM water electrolysis system
By combining a gas chromatograph with a partial pressure pipeline, and utilizing a regulating valve and a gas pressure detection device, the problem of inaccurate detection by the sensor under low current density conditions was solved, achieving high-precision monitoring of low-flow-rate gases and meeting the detection requirements of PEM water electrolysis devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-03-27
AI Technical Summary
In the prior art, sensors used to detect the concentration of hydrogen in oxygen/oxygen in hydrogen are difficult to achieve effective detection when the PEM electrolyzer is operating under low current density conditions, and the detection accuracy is easily affected by changes in gas pressure.
Using a gas chromatograph and partial pressure pipeline, the gas flow rate and pressure are controlled by regulating valves. Combined with a gas pressure detection device and a gas flow meter, the detection sensitivity and accuracy are improved, making it suitable for the detection of low-flow-rate gases.
It enables effective detection of low gas flow rates under low current density conditions, improving detection accuracy and stability, and meeting the operational requirements of PEM water electrolysis devices.
Smart Images
Figure CN224052106U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the field of gas detection devices, and particularly relates to a PEM electrolytic water gas production monitoring device and a PEM water electrolysis system. BACKGROUND
[0002] A PEM (Proton Exchange Membrane) electrolyzer is a device for electrolyzing water under the action of an external direct current power source, generating oxygen, protons and electrons at the anode, the protons reaching the cathode through a proton exchange membrane, and the electrons reaching the cathode through an external circuit and generating hydrogen gas at the cathode. When the operating conditions of the PEM electrolyzer are unstable, hydrogen and oxygen are prone to cross-penetration, that is, oxygen produced on the anode side penetrates through the proton exchange membrane to the cathode side, and hydrogen produced on the cathode side penetrates through the proton exchange membrane to the anode side. Especially when the PEM electrolyzer is operated under low current density conditions, the gas production rate is reduced, and the penetration effect is more obvious.
[0003] In order to ensure the normal operation of the PEM electrolyzer, a gas detection device is usually used to detect the hydrogen / oxygen concentration in oxygen / oxygen in hydrogen, and then take appropriate measures. At present, the hydrogen / oxygen concentration in oxygen / oxygen in hydrogen is generally detected by a sensor. However, the commonly used sensor generally needs to reach a gas flow of 200 ml / min or more to start detection work. In the case that the PEM electrolyzer is operated under low current density conditions and the gas flow rate is small, it is difficult to achieve effective detection. In addition, the detection accuracy of the sensor is easily affected by the change of gas pressure. CONTENT OF THE UTILITY MODEL
[0004] The purpose of the present application is to provide a PEM electrolytic water gas production monitoring device and a PEM water electrolysis system, which aims to solve the technical problems that the sensor for detecting the hydrogen / oxygen concentration in oxygen / oxygen in hydrogen in the prior art is difficult to achieve effective detection in the case that the PEM electrolyzer is operated under low current density conditions and the gas flow rate is small, and the detection accuracy of the sensor is easily affected by the change of gas pressure.
[0005] In one aspect, to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a PEM electrolytic water gas production monitoring device, comprising a conveying pipeline, a gas chromatograph, a partial pressure pipeline and an adjusting valve, one end of the conveying pipeline is used to be connected with a PEM electrolytic water device to collect the gas produced by the PEM electrolytic water device, the other end of the conveying pipeline is connected with the gas chromatograph, one end of the partial pressure pipeline is connected to a position between the two ends of the conveying pipeline, the partial pressure pipeline is in communication with the conveying pipeline, and the adjusting valve is arranged on the partial pressure pipeline.
[0006] Compared with the prior art, the PEM electrolytic water gas production monitoring device provided by the application has the beneficial effects that: in operation, the conveying pipeline is connected to the anode side or the cathode side of the PEM electrolytic water device, when connected to the anode side, hydrogen mixed oxygen is collected, when connected to the cathode side, oxygen mixed hydrogen is collected, the conveying pipeline conveys the collected gas to the gas chromatograph, and the concentration of hydrogen in oxygen / oxygen in hydrogen is monitored by the gas chromatograph. Compared with a general sensor, the detection sensitivity and detection accuracy of the gas chromatograph are higher, and the gas chromatograph can generally effectively detect the gas with a flow rate as low as 10 ml / min, so that the detection requirement of the PEM electrolytic water device under the condition of low current density and low gas flow rate can be met. In addition, the pressure dividing pipeline is connected to the conveying pipeline, and the adjusting valve is arranged on the pressure dividing pipeline, so that the opening degree of the adjusting valve can be adjusted to control the flow rate and pressure of the gas entering the pressure dividing pipeline from the conveying pipeline, so that the pressure of the gas conveyed to the gas chromatograph is adjusted, the pressure is maintained stable, and the detection accuracy of the gas chromatograph is improved.
[0007] Further, the PEM electrolytic water gas production monitoring device further comprises a gas pressure detection device, and the gas pressure detection device is arranged on the conveying pipeline.
[0008] Further, the conveying pipeline comprises an upstream pipeline and a downstream pipeline, one end of the upstream pipeline is used for being connected to the PEM electrolytic water device, the other end of the upstream pipeline is connected to one end of the downstream pipeline, the other end of the downstream pipeline is connected to the gas chromatograph, and the pressure dividing pipeline is connected to the connection position of the upstream pipeline and the downstream pipeline; and the gas pressure detection device is arranged on the downstream pipeline.
[0009] Further, the PEM electrolytic water gas production monitoring device further comprises a gas flow meter, and the gas flow meter is arranged on the conveying pipeline.
[0010] Further, the conveying pipeline comprises an upstream pipeline and a downstream pipeline, one end of the upstream pipeline is used for being connected to the PEM electrolytic water device, the other end of the upstream pipeline is connected to one end of the downstream pipeline, the other end of the downstream pipeline is connected to the gas chromatograph, and the pressure dividing pipeline is connected to the connection position of the upstream pipeline and the downstream pipeline; and the gas flow meter is arranged on the downstream pipeline.
[0011] Further, the PEM electrolytic water gas production monitoring device further comprises a gas dryer, and the gas dryer is arranged on the conveying pipeline.
[0012] Further, the PEM electrolytic water gas production monitoring device further comprises a waste gas collecting device, and the waste gas collecting device is arranged at the end of the pressure dividing pipeline away from the conveying pipeline.
[0013] In another aspect, to achieve the above object, the technical scheme adopted by the present application is as follows: a PEM water electrolysis system, comprising a PEM water electrolysis device and the PEM water electrolysis gas production monitoring device described above, the PEM water electrolysis device having an anode exhaust end and a cathode exhaust end, and the number of the PEM water electrolysis gas production monitoring devices being one or two.
[0014] When the number of the PEM water electrolysis gas production monitoring devices is one, the conveying pipeline is connected to the anode exhaust end or the cathode exhaust end.
[0015] When the number of the PEM water electrolysis gas production monitoring devices is two, the conveying pipeline of one PEM water electrolysis gas production monitoring device is connected to the anode exhaust end, and the conveying pipeline of the other PEM water electrolysis gas production monitoring device is connected to the cathode exhaust end.
[0016] Compared with the prior art, the PEM water electrolysis system provided by the present application has the following beneficial effects: when the conveying pipeline is connected to the anode exhaust end, the conveying pipeline can collect the oxygen mixed with hydrogen discharged from the anode exhaust end and convey the collected gas to the gas chromatograph, and the hydrogen concentration in the oxygen is monitored by the gas chromatograph; when the conveying pipeline is connected to the cathode exhaust end, the conveying pipeline can collect the hydrogen mixed with oxygen discharged from the cathode exhaust end and convey the collected gas to the gas chromatograph, and the oxygen concentration in the hydrogen is monitored by the gas chromatograph. Compared with general sensors, the detection sensitivity and detection accuracy of the gas chromatograph are higher, and the gas chromatograph can generally effectively detect the gas with a flow rate as low as 10 ml / min, thereby meeting the detection requirements when the PEM water electrolysis device operates under a low current density condition and the gas flow is small. In addition, by connecting the pressure dividing pipeline to the conveying pipeline and setting the adjusting valve on the pressure dividing pipeline, the flow rate and pressure of the gas entering the pressure dividing pipeline from the conveying pipeline can be controlled by adjusting the opening degree of the adjusting valve, thereby adjusting the pressure of the gas conveyed to the gas chromatograph, maintaining the pressure stable, and improving the detection accuracy of the gas chromatograph.
[0017] Further, the PEM water electrolysis device comprises a PEM electrolytic cell, an anode gas-water separation device and a cathode gas-water separation device, the PEM electrolytic cell has an anode exhaust water end and a cathode exhaust water end, the anode gas-water separation device has a first gas inlet water end, a first water outlet end and an anode exhaust end, the first gas inlet water end is connected to the anode exhaust water end, and the cathode gas-water separation device has a second gas inlet water end, a second water outlet end and a cathode exhaust end, the second gas inlet water end is connected to the cathode exhaust water end.
[0018] Further, the PEM water electrolysis device further comprises a water tank, a water feeding pipeline, an anode backflow pipeline and a cathode backflow pipeline, the two ends of the water feeding pipeline are respectively connected to the water tank and the PEM electrolytic cell, the two ends of the anode backflow pipeline are respectively connected to the first water outlet end and the water tank, and the two ends of the cathode backflow pipeline are respectively connected to the second water outlet end and the water tank. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.
[0020] Figure 1 A structural schematic diagram of a PEM water electrolysis system provided for Embodiment Two of the present application is shown in the figure.
[0021] Figure 2 A structural schematic diagram of a PEM water electrolysis system provided for Embodiment Three of the present application is shown in the figure.
[0022] Figure 3 A structural schematic diagram of a PEM water electrolysis system provided for Embodiment Four of the present application is shown in the figure.
[0023] In the figure, various reference signs are as follows:
[0024] 100, PEM electrolysis water gas production monitoring device; 10, conveying pipeline; 11, upstream pipeline; 12, downstream pipeline; 20, gas chromatograph; 30, partial pressure pipeline; 40, regulating valve; 50, gas pressure detection device; 60, gas flow meter; 70, gas dryer; 80, waste gas collection device;
[0025] 200, PEM electrolysis water device; 201, PEM electrolysis cell; 2011, anode; 2012, cathode; 202, direct current power supply; 203, anode gas-water separation device; 204, water tank; 205, water feeding pipeline; 206, anode backflow pipeline; 207, cathode backflow pipeline; 208, cathode gas-water separation device; 209, water purifier; 210, constant temperature water tank; 211, circulating pump; 212, deionization column; 213, resistivity detector; 214, liquid flow meter. DETAILED DESCRIPTION
[0026] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.
[0027] In the description of the present application, it needs to be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.
[0028] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.
[0029] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0030] There are currently three technologies for commercial electrolysis of water, high-temperature solid oxide electrolysis of water, alkaline electrolysis of water and PEM (Proton Exchange Membrane, PEM) electrolysis of water. Among them, PEM electrolysis of water has the advantages of high working current density, fast working response speed, high hydrogen purity, wide load range and high output hydrogen pressure, and is the most promising electrolysis of water technology. PEM electrolysis of water mainly uses PEM electrolysis cell, which is a device that electrolyzes water under the action of external direct current power, generates oxygen, protons and electrons at the anode, protons reach the cathode through the proton exchange membrane, and electrons reach the cathode through the external circuit to generate hydrogen at the cathode.
[0031] PEM electrolysis water can be coupled with distributed renewable energy power generation system to produce hydrogen, which is used for power peak shaving and consumption of waste photovoltaic and wind power. However, affected by fluctuating energy sources, the operating conditions of the PEM electrolyzer are unstable, resulting in frequent changes in the permeability and concentration of the gas, especially when the current density suddenly changes, the hydrogen produced on the cathode side is more likely to penetrate through the proton exchange membrane to the anode side, increasing the hydrogen concentration in the oxygen, at the same time, the oxygen produced on the anode side is more likely to penetrate through the proton exchange membrane to the cathode side, increasing the oxygen concentration in the hydrogen, thereby bringing the risk of explosion. When the PEM electrolyzer is operated under low current density conditions, the gas generation rate is reduced, and the penetration effect is more obvious.
[0032] In order to ensure the normal operation of the PEM electrolyzer, it is usually necessary to use a gas detection device to detect the hydrogen / oxygen concentration in the oxygen, and then take appropriate measures. At present, the hydrogen / oxygen concentration in the oxygen is generally detected by a sensor, however, the commonly used sensor generally needs to reach a gas flow of 200 ml / min or more to start detection work, and it is difficult to achieve effective detection under the condition of low current density operation of the PEM electrolyzer and small gas flow. In addition, the detection accuracy of the sensor is easily affected by the change of gas pressure.
[0033] In view of the above problems, the embodiment of the present application provides a PEM electrolysis water gas production monitoring device, which can improve the detection sensitivity and accuracy compared with the general sensor, and can meet the detection requirements of the PEM electrolyzer under low current density conditions and small gas flow. The specific structure of the PEM electrolysis water gas production monitoring device can be seen from the following description:
[0034] Embodiment one
[0035] As shown in Figure 1 The embodiment provides a PEM electrolysis water gas production monitoring device 100, which comprises a conveying pipeline 10, a gas chromatograph 20, a pressure dividing pipeline 30 and an adjusting valve 40. One end of the conveying pipeline 10 is used to be connected with a PEM electrolysis water device 200 to collect the gas produced by the PEM electrolysis water device 200, the other end of the conveying pipeline 10 is connected with the gas chromatograph 20, one end of the pressure dividing pipeline 30 is connected between the two ends of the conveying pipeline 10, the pressure dividing pipeline 30 is in communication with the conveying pipeline 10, and the adjusting valve 40 is arranged on the pressure dividing pipeline 30.
[0036] In operation, the delivery pipeline 10 is connected to the anode side or the cathode side of the PEM water electrolysis device 200, and when connected to the anode side, collects oxygen mixed with hydrogen produced by the PEM water electrolysis device 200, and when connected to the cathode side, collects hydrogen mixed with oxygen produced by the PEM water electrolysis device 200, and the delivery pipeline 10 delivers the collected gas to the gas chromatograph 20, and the gas chromatograph 20 monitors the concentration of hydrogen in oxygen or oxygen in hydrogen. Compared with general sensors, the detection sensitivity and accuracy of the gas chromatograph 20 are higher, and the gas chromatograph 20 can generally effectively detect a gas with a flow rate as low as 10 ml / min, thereby meeting the detection requirements when the PEM water electrolysis device 200 operates at a low current density and the gas flow is small. In addition, the partial pressure pipeline 30 is connected to the delivery pipeline 10, and the adjusting valve 40 is arranged on the partial pressure pipeline 30, so that the opening of the adjusting valve 40 can be adjusted to control the flow rate and pressure of the gas entering the partial pressure pipeline 30 from the delivery pipeline 10, thereby adjusting the pressure of the gas delivered to the gas chromatograph 20, maintaining the pressure stable, and improving the detection accuracy of the gas chromatograph 20.
[0037] Further, the PEM water electrolysis gas production monitoring device 100 further comprises a gas pressure detection device 50 arranged on the delivery pipeline 10. By arranging the gas pressure detection device 50 on the delivery pipeline 10, the pressure of the gas in the delivery pipeline 10 can be detected, and in operation, the opening of the adjusting valve 40 can be adjusted in time according to the detection result of the gas pressure detection device 50, so that the pressure of the gas in the delivery pipeline 10 can be adjusted, the pressure is maintained stable, and the detection accuracy of the gas chromatograph 20 is improved.
[0038] Further, the delivery pipeline 10 comprises an upstream pipeline 11 and a downstream pipeline 12, one end of the upstream pipeline 11 is used to be connected to the PEM water electrolysis device 200, the other end of the upstream pipeline 11 is connected to one end of the downstream pipeline 12, the other end of the downstream pipeline 12 is connected to the gas chromatograph 20, and the partial pressure pipeline 30 is connected to the connection between the upstream pipeline 11 and the downstream pipeline 12; the gas pressure detection device 50 is arranged on the downstream pipeline 12. In operation, the gas produced by the PEM water electrolysis device 200 first enters the upstream pipeline 11 of the delivery pipeline 10, after passing through the upstream pipeline 11, part of the gas enters the partial pressure pipeline 30, and the other part enters the downstream pipeline 12, and then is delivered to the gas chromatograph 20. By adjusting the opening of the adjusting valve 40, the flow rate and pressure of the gas passing through the partial pressure pipeline 30 can be adjusted, so that the pressure of the gas in the downstream pipeline 12 can be adjusted. By arranging the gas pressure detection device 50 on the downstream pipeline 12, the pressure of the gas delivered from the downstream pipeline 12 to the gas chromatograph 20 can be accurately detected, so that the pressure of the gas delivered to the gas chromatograph 20 can be accurately adjusted, and the detection accuracy of the gas chromatograph 20 is improved.
[0039] Further, the PEM electrolysis water gas production monitoring device 100 further comprises a gas flow meter 60, which is arranged on the delivery pipeline 10. By arranging the gas flow meter 60 on the delivery pipeline 10, the flow rate of the gas in the delivery pipeline 10 can be detected. In operation, the opening degree of the regulating valve 40 can be adjusted in time according to the detection structure of the gas flow meter 60, so as to adjust the flow rate of the gas in the delivery pipeline 10 and maintain the flow rate stable, thereby improving the detection accuracy of the gas chromatograph 20.
[0040] Further, the gas flow meter 60 is arranged on the downstream pipeline 12. By adjusting the opening degree of the regulating valve 40, the flow rate of the gas passing through the partial pressure pipeline 30 can be adjusted, so as to adjust the flow rate of the gas in the downstream pipeline 12. By arranging the gas flow meter 60 on the downstream pipeline 12, the flow rate of the gas delivered from the downstream pipeline 12 to the gas chromatograph 20 can be accurately detected, so as to accurately adjust the flow rate of the gas delivered to the gas chromatograph 20 and improve the detection accuracy of the gas chromatograph 20. Specifically, the gas flow meter 60 can be selected from a turbine flow meter, a float-type gas flow meter 60, a differential pressure flow meter, a velocity flow meter, a diaphragm flow meter, a capillary flow meter, etc. which can be used to monitor the flow rate of the gas at 0-40 mL / min.
[0041] Further, the PEM electrolysis water gas production monitoring device 100 further comprises a gas dryer 70, which is arranged on the delivery pipeline 10. By arranging the gas dryer 70 on the delivery pipeline 10, the moisture in the gas can be removed, so as to ensure that the gas delivered to the gas chromatograph 20 is dry, thereby improving the detection accuracy of the gas chromatograph 20. Specifically, the gas dryer 70 can be selected from a drying molecular sieve, which can be made of one or more materials such as silica gel, alumina, and aluminosilicate.
[0042] Further, the PEM electrolysis water gas production monitoring device 100 further comprises a waste gas collection device 80, which is arranged at the end of the partial pressure pipeline 30 away from the delivery pipeline 10. In operation, part of the gas produced by the PEM electrolysis water device 200 is delivered to the gas chromatograph 20 for detection through the delivery pipeline 10, and the remaining part is delivered to the waste gas collection device 80 through the partial pressure pipeline 30, so as to realize centralized treatment of the waste gas.
[0043] Example Two
[0044] As Figure 1As shown, the embodiment provides a PEM water electrolysis system, which comprises a PEM water electrolysis device 200 and the PEM water electrolysis gas production monitoring device 100 of embodiment one. The PEM water electrolysis device 200 has an anode exhaust end and a cathode exhaust end. The number of the PEM water electrolysis gas production monitoring device 100 is one. The end of the conveying pipeline 10 away from the gas chromatograph 20 is connected with the anode exhaust end, so that the gas chromatograph 20 is in communication with the anode exhaust end.
[0045] The conveying pipeline 10 can collect the oxygen mixed with hydrogen discharged from the anode exhaust end and convey the collected gas to the gas chromatograph 20. The hydrogen concentration in the oxygen is monitored by the gas chromatograph 20. Compared with general sensors, the detection sensitivity and detection accuracy of the gas chromatograph 20 are higher. The gas chromatograph 20 can generally effectively detect the gas with a flow rate as low as 10 ml / min, so as to meet the detection requirements when the PEM water electrolysis device 200 is operated under a low current density condition and the gas flow is small. In addition, the partial pressure pipeline 30 is connected with the conveying pipeline 10, and the adjusting valve 40 is arranged on the partial pressure pipeline 30. The opening of the adjusting valve 40 can be adjusted to control the flow rate and pressure of the gas entering the partial pressure pipeline 30 from the conveying pipeline 10, so as to adjust the pressure of the gas conveyed to the gas chromatograph 20, maintain the pressure stable, and improve the detection accuracy of the gas chromatograph 20.
[0046] Further, the PEM electrolytic water device 200 comprises a PEM electrolytic cell 201, an anode gas-water separation device 203 and a cathode gas-water separation device 208, the PEM electrolytic cell 201 has an anode 2011 and a cathode 2012, the anode 2011 has an anode exhaust water end, the cathode 2012 has a cathode exhaust water end, the anode gas-water separation device 203 has a first gas inlet end, a first water outlet end and an anode exhaust end, the first gas inlet end is connected with the anode exhaust water end, the cathode gas-water separation device 208 has a second gas inlet end, a second water outlet end and a cathode exhaust end, the second gas inlet end is connected with the cathode exhaust water end. In operation, the water flowing out of the anode exhaust water end and the oxygen mixed with hydrogen first enter the anode gas-water separation device 203 through the first gas inlet end, the gas and water are separated in the anode gas-water separation device 203, the separated gas enters the conveying pipeline 10 through the first exhaust end, and the separated water is discharged from the first water outlet end. The water flowing out of the cathode exhaust water end and the hydrogen or the hydrogen mixed with oxygen first enter the cathode gas-water separation device 208 through the second gas inlet end, the gas and water are separated in the cathode gas-water separation device 208, the separated gas is discharged from the second exhaust end, and the separated water is discharged from the second water outlet end. Specifically, the anode gas-water separation device 203 and the cathode gas-water separation device 208 can be made of one or more of glass fiber, ceramic, polycarbonate, polyethylene, polytetrafluoroethylene, 316 stainless steel, etc. Specifically, the first gas inlet end and the anode exhaust water end can be connected by a pipeline, and the second gas inlet end and the cathode exhaust water end can be connected by a pipeline.
[0047] Further, the PEM electrolytic water device 200 further comprises a direct current power supply 202, the positive electrode of the direct current power supply 202 is connected with the anode 2011 of the PEM electrolytic cell 201, and the negative electrode of the direct current power supply 202 is connected with the cathode 2012 of the PEM electrolytic cell 201. Under the action of the direct current power supply 202, water is electrolyzed to generate oxygen, protons and electrons at the anode 2011, the protons reach the cathode 2012 through the proton exchange membrane, and the electrons reach the cathode 2012 through the external circuit to generate hydrogen at the cathode 2012.
[0048] Further, the PEM electrolytic water device 200 further comprises a water tank 204, a water feeding pipeline 205, an anode backflow pipeline 206 and a cathode backflow pipeline 207, two ends of the water feeding pipeline 205 are connected with the water tank 204 and the PEM electrolytic cell 201 respectively, two ends of the anode backflow pipeline 206 are connected with the first water outlet end and the water tank 204 respectively, and two ends of the cathode backflow pipeline 207 are connected with the second water outlet end and the water tank 204 respectively.
[0049] In operation, water in the water tank 204 is delivered to the PEM electrolysis cell 201 through the delivery pipeline 10, and the water is electrolyzed to generate oxygen, protons and electrons at the anode 2011. The protons reach the cathode 2012 through the proton exchange membrane, and the electrons reach the cathode 2012 through the external circuit to generate hydrogen at the cathode 2012. The water flowing out of the anode exhaust water end and the oxygen mixed with hydrogen first enter the anode gas-water separation device 203 through the first gas inlet water end, and the gas and water are separated in the anode gas-water separation device 203. The oxygen mixed with hydrogen separated is delivered to the gas chromatograph 20 through the first exhaust end and the delivery pipeline 10. The water separated is delivered to the water tank 204 through the first exhaust water end and the anode backflow pipeline 206, thereby realizing the recycling of water. Meanwhile, the water flowing out of the cathode exhaust water end and the hydrogen or hydrogen mixed with oxygen first enter the cathode gas-water separation device 208 through the second gas inlet water end, and the gas and water are separated in the cathode gas-water separation device 208. The hydrogen or hydrogen mixed with oxygen separated is discharged from the second exhaust end, and the water separated is delivered to the water tank 204 through the second exhaust water end and the cathode backflow pipeline 207, thereby realizing the recycling of water. Specifically, the water tank 204 can be made of non-metallic materials, such as polyethylene, polytetrafluoroethylene, PP low-density polyethylene, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, etc.
[0050] Further, the PEM electrolytic water device 200 also includes a waste gas collection device 80, and the waste gas collection device 80 of the PEM electrolytic water device 200 is connected with the second exhaust end through a pipeline. After the gas and water are separated in the cathode gas-water separation device 208, the hydrogen or hydrogen mixed with oxygen separated is delivered to the waste gas collection device 80 through the pipeline after being discharged from the second exhaust end, thereby realizing the centralized treatment of waste gas.
[0051] Further, the PEM electrolytic water device 200 also includes a pure water machine 209, and the pure water machine 209 is connected with the water tank 204 for purifying the water in the water tank 204. The pure water machine 209 and the water tank 204 can be connected through a pipeline.
[0052] Furthermore, the water supply pipeline 205 is sequentially equipped with a constant temperature water tank 210, a circulating pump 211, a deionization column 212, a resistivity detector 213, and a liquid flow meter 214 in the direction closest to the anode 2011. The constant temperature water tank 210 can be a heating water tank 204, an oil bath, a heat exchanger, or other devices with heat exchange functions. The circulating pump 211 can be a centrifugal pump, a magnetic pump, a gear pump, a vacuum pump, a reciprocating pump, or other pumps that can be used to transport liquids, and its head can meet the requirement of maintaining the circulating water flow at 0.2-10 L / min. The liquid flow meter 214 can be a turbine flow meter, an ultrasonic flow meter, an electromagnetic flow meter, a rotor flow meter, a volumetric flow meter, or other flow meters that can be used to monitor the flow rate with a range of 0-1 L / min.
[0053] Specifically, the pipeline can be made of non-metallic materials, such as polyethylene, silicone tubing, polytetrafluoroethylene, polypropylene, and random copolymer polypropylene, which have certain heat resistance, mechanical strength, and chemical corrosion resistance, and can meet the requirement of maintaining the hydrolysis operating temperature between 25-90℃. The pipeline may include a delivery pipeline 10, a pressure dividing pipeline 30, a water delivery pipeline 205, an anode return pipeline 206, a cathode return pipeline 207, a pipeline between the first air inlet water end and the anode exhaust water end, a pipeline between the second air inlet water end and the cathode exhaust water end, and a pipeline between the pure water machine 209 and the water tank 204.
[0054] Example 3
[0055] like Figure 2 As shown, this embodiment provides a PEM water electrolysis system. The difference between the PEM water electrolysis system in this embodiment and the PEM water electrolysis system in Embodiment 2 is as follows: In Embodiment 2, the end of the delivery pipeline 10 of the PEM water electrolysis gas production monitoring device 100 that is away from the gas chromatograph 20 is connected to the anode exhaust end; while in this embodiment, the end of the delivery pipeline 10 of the PEM water electrolysis gas production monitoring device 100 that is away from the gas chromatograph 20 is connected to the cathode exhaust end.
[0056] The delivery pipeline 10 collects hydrogen gas mixed with oxygen discharged from the cathode exhaust end and delivers the collected gas to the gas chromatograph 20, which monitors the oxygen concentration in the hydrogen. Compared to general sensors, the gas chromatograph 20 has higher detection sensitivity and accuracy, and can generally effectively detect gases with flow rates as low as 10 ml / min, thus meeting the detection requirements of the PEM water electrolysis device 200 when operating under low current density conditions and with low gas flow rates. Furthermore, by connecting the pressure-partitioning pipeline 30 to the delivery pipeline 10 and installing a regulating valve 40 on the pressure-partitioning pipeline 30, the opening of the regulating valve 40 can be adjusted to control the flow rate and pressure of the gas entering the pressure-partitioning pipeline 30 from the delivery pipeline 10, thereby regulating the pressure of the gas delivered to the gas chromatograph 20, maintaining pressure stability, and improving the detection accuracy of the gas chromatograph 20.
[0057] The difference between the PEM water electrolysis system of this embodiment and the PEM water electrolysis system of Embodiment 2 also includes: the waste gas collection device 80 of the PEM water electrolysis device 200 of Embodiment 2 is connected to the second exhaust end of the cathode gas-water separation device 208 through a pipeline; the waste gas collection device 80 of the PEM water electrolysis device 200 of this embodiment is connected to the first exhaust end of the anode gas-water separation device 203 through a pipeline.
[0058] The rest of this embodiment is the same as that in Embodiment 2. Features not explained in this embodiment are explained using the methods in Embodiment 2, and will not be repeated here.
[0059] Example 4
[0060] like Figure 3 As shown, this embodiment provides a PEM water electrolysis system. The difference between this embodiment and the PEM water electrolysis system in Embodiment 3 includes: Embodiment 3 has one PEM water electrolysis gas generation monitoring device 100, with the end of the delivery pipeline 10 of the PEM water electrolysis gas generation monitoring device 100 away from the gas chromatograph 20 connected to the anode exhaust end; while this embodiment has two PEM water electrolysis gas generation monitoring devices 100, with the end of the delivery pipeline 10 of one PEM water electrolysis gas generation monitoring device 100 away from the gas chromatograph 20 connected to the anode exhaust end, and the end of the delivery pipeline 10 of the other PEM water electrolysis gas generation monitoring device 100 away from the gas chromatograph 20 connected to the cathode exhaust end. Specifically, both PEM water electrolysis gas generation monitoring devices 100 have a waste gas collection device 80 at the end of the pressure dividing pipeline 30 away from the delivery pipeline 10, one for collecting oxygen mixed with hydrogen, and the other for collecting hydrogen mixed with oxygen.
[0061] The rest of this embodiment is the same as that in Embodiment 3. Features not explained in this embodiment are explained using the methods in Embodiment 3, and will not be repeated here.
[0062] It should be noted that the above-mentioned embodiments are only preferred embodiments of the present application, and are not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A PEM electrolysis water gas production monitoring device, characterized by, The device comprises a conveying pipeline, a gas chromatograph, a partial pressure pipeline and a regulating valve. One end of the conveying pipeline is connected with a PEM electrolytic water device to collect the gas produced by the PEM electrolytic water device. The other end of the conveying pipeline is connected with the gas chromatograph. One end of the partial pressure pipeline is connected with the conveying pipeline between the two ends of the conveying pipeline. The partial pressure pipeline is in communication with the conveying pipeline. The regulating valve is arranged on the partial pressure pipeline.
2. The PEM electrolytic water-gas generation monitoring device of claim 1, wherein: The PEM electrolytic water gas production monitoring device further comprises a gas pressure detection device arranged on the conveying pipeline.
3. The PEM electrolytic water-gas generation monitoring device of claim 2, wherein: The conveying pipeline comprises an upstream pipeline and a downstream pipeline. One end of the upstream pipeline is connected with the PEM electrolytic water device. The other end of the upstream pipeline is connected with one end of the downstream pipeline. The other end of the downstream pipeline is connected with the gas chromatograph. The partial pressure pipeline is connected with the connection between the upstream pipeline and the downstream pipeline. The gas pressure detection device is arranged on the downstream pipeline.
4. The PEM electrolytic water-gas generation monitoring device of claim 1, wherein: The PEM electrolytic water gas production monitoring device further comprises a gas flow meter arranged on the conveying pipeline.
5. The PEM electrolytic water-gas generation monitoring device of claim 4, wherein: The conveying pipeline comprises an upstream pipeline and a downstream pipeline. One end of the upstream pipeline is connected with the PEM electrolytic water device. The other end of the upstream pipeline is connected with one end of the downstream pipeline. The other end of the downstream pipeline is connected with the gas chromatograph. The partial pressure pipeline is connected with the connection between the upstream pipeline and the downstream pipeline. The gas flow meter is arranged on the downstream pipeline.
6. The PEM electrolysis water production monitoring device according to any one of claims 1-5, wherein: The PEM electrolytic water gas production monitoring device further comprises a gas dryer arranged on the conveying pipeline.
7. The PEM electrolysis water production monitoring device according to any one of claims 1-5, wherein: The PEM electrolytic water gas production monitoring device further comprises a waste gas collecting device arranged on the end of the partial pressure pipeline away from the conveying pipeline.
8. A PEM water electrolysis system, characterized in that, The device comprises a PEM electrolytic water device and the PEM electrolytic water gas production monitoring device according to any one of claims 1-7. The PEM electrolytic water device has an anode exhaust end and a cathode exhaust end. The number of the PEM electrolytic water gas production monitoring devices is one or two. When the number of the PEM electrolytic water gas production monitoring devices is one, the conveying pipeline is connected with the anode exhaust end or the cathode exhaust end. When the number of the PEM electrolytic water gas production monitoring devices is two, the conveying pipeline of one of the PEM electrolytic water gas production monitoring devices is connected with the anode exhaust end, and the conveying pipeline of the other of the PEM electrolytic water gas production monitoring devices is connected with the cathode exhaust end.
9. The PEM water electrolysis system of claim 8, characterized in that: The PEM electrolytic water device comprises a PEM electrolytic cell, an anode gas-water separation device and a cathode gas-water separation device. The PEM electrolytic cell has an anode exhaust water end and a cathode exhaust water end. The anode gas-water separation device has a first gas inlet water end, a first water outlet end and the anode exhaust end. The first gas inlet water end is connected with the anode exhaust water end. The cathode gas-water separation device has a second gas inlet water end, a second water outlet end and the cathode exhaust end. The second gas inlet water end is connected with the cathode exhaust water end.
10. The PEM water electrolysis system of claim 9, characterized in that: The PEM water electrolysis device further comprises a water tank, a water feeding pipeline, an anode backflow pipeline and a cathode backflow pipeline, two ends of the water feeding pipeline are connected with the water tank and the PEM electrolysis cell respectively, two ends of the anode backflow pipeline are connected with the first water draining end and the water tank respectively, and two ends of the cathode backflow pipeline are connected with the second water draining end and the water tank respectively.