System for measuring purity of gas produced by electrolytic cell

Abstract

The utility model provides an electrolytic cell produced gas purity measuring system which is applied to hydrogen production equipment, a sample gas sampling opening is formed in the upstream of a main gas outlet pipeline of the hydrogen production equipment, and a branch gas outlet pipeline is arranged on the sample gas sampling opening. The measuring system comprises a branch gas-liquid separator and a condenser which are arranged at the upstream of a branch gas outlet pipeline and are connected in sequence; the pressure reducing valve, the filter, the dryer, the gas flow controller and the gas purity analyzer are arranged at the downstream of the branch gas outlet pipeline and are connected in sequence; and a three-way valve is arranged between the pressure reducing valve and the filter on the branch air outlet pipeline and is connected with the air inlet interface. Based on the measuring system, inert gas can flow into the gas purity analyzer from the gas inlet interface through the three-way valve connected with the gas inlet interface when gas purity analysis of the sample gas is stopped or stopped, so that residual sample gas in the gas purity analyzer flows out of the sample gas outlet; therefore, the accurate detection of the gas purity analyzer is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrolysis of water, in particular to a measuring system for measuring the purity of gas produced by an electrolytic cell. BACKGROUND

[0002] In the process of electrolysis of water to produce hydrogen by an electrolytic cell, a measuring system for measuring the purity of gas produced by the electrolytic cell is usually required. The measuring system is used to detect the purity of the gas produced by the electrolytic cell, so as to determine the technical state and operation safety of the electrolytic cell, and then verify whether the purity of the hydrogen and oxygen produced by the electrolytic cell meets the standard of industrial application.

[0003] In the related art, the main equipment for measuring the purity of gas includes gas chromatography, thermal conductivity analyzer, electrochemical sensor reaction analyzer, photoelectric analyzer and various gas purity analyzers. When the gas purity analyzer is used to analyze the purity of gas produced by the hydrogen production equipment, the measured gas is easy to remain in the gas purity analyzer, thereby interfering with the subsequent gas purity analysis. CONTENT OF THE UTILITY MODEL

[0004] The present application provides at least a measuring system for measuring the purity of gas produced by an electrolytic cell. The sample gas sampling port can sample the gas produced by the hydrogen production equipment to obtain sample gas, and the sample gas can be subjected to gas-liquid separation, condensation water removal, pressure reduction, filtration, drying and flow control. Then, the purity of the sample gas is analyzed by a gas purity analyzer. At the same time, when the gas purity analysis of the sample gas is stopped or terminated, the three-way valve connected with the gas inlet interface can make the inert gas flow from the gas inlet interface into the gas purity analyzer to make the residual sample gas in the gas purity analyzer flow out from the sample gas outlet, thereby ensuring the accurate detection of the gas purity analyzer.

[0005] The present application provides a measuring system for measuring the purity of gas produced by an electrolytic cell, which is applied to a hydrogen production equipment. The hydrogen production equipment includes a gas outlet, and the gas outlet is provided with a main outflow pipeline. The end of the main outflow pipeline has a main gas outlet. An upstream of the main outflow pipeline is provided with a sample gas sampling port. The sample gas sampling port is provided with a branch outflow pipeline. The end of the branch outflow pipeline has a sample gas outlet. The measuring system comprises:

[0006] A branch gas-liquid separator and a condenser connected in sequence are arranged in the upstream of the branch outflow pipeline. The branch gas-liquid separator is used to separate the sample gas flowing out of the sample gas sampling port into gas and liquid. The condenser is used to condense and remove water from the sample gas.

[0007] A pressure reducing valve, a filter, a dryer, a gas flow controller and a gas purity analyzer are sequentially connected downstream of the branch gas outlet pipeline; the pressure reducing valve is used to reduce the pressure of the sample gas to meet the pressure requirement of the gas purity analyzer; the filter is used to filter the sample gas to prevent contaminants from entering the gas purity analyzer; the dryer is used to dry the sample gas to meet the humidity requirement of the gas purity analyzer; the gas flow controller is used to adjust the flow of the sample gas into the gas purity analyzer to meet the flow requirement of the gas purity analyzer; and the gas purity analyzer is used to analyze the gas purity of the sample gas.

[0008] A three-way valve is arranged between the pressure reducing valve and the filter on the branch gas outlet pipeline, and the three-way valve is connected with the gas inlet interface; when the gas purity of the sample gas is analyzed, the three-way valve is used to be in a normal position to make the sample gas flow into the sample gas sampling port and flow out of the sample gas outlet; when the gas purity analysis of the sample gas is suspended or stopped, the three-way valve is used to be switched to a position to make the inert gas flow into the gas purity analyzer from the gas inlet interface to make the residual sample gas in the gas purity analyzer flow out of the sample gas outlet.

[0009] In a possible implementation, the gas inlet interface is connected with a standard gas source, and the three-way valve is used to be switched to a position to make the standard gas flow into the gas purity analyzer from the gas inlet interface and flow out of the sample gas outlet so as to calibrate and calibrate the gas purity analyzer.

[0010] In a possible implementation, a first switch valve is further arranged between the condenser and the gas purity analyzer on the branch gas outlet pipeline, and a second switch valve is further arranged at the outlet of the gas purity analyzer on the branch gas outlet pipeline; when the gas purity of the sample gas is analyzed, the first switch valve and the second switch valve are both in an open state; when the gas purity analysis of the sample gas is suspended or stopped, the first switch valve and the second switch valve are both in a closed state.

[0011] In a possible implementation, the first switch valve is arranged at the inlet of the gas purity analyzer.

[0012] In a possible implementation, a pressure sensor is further arranged between the pressure reducing valve and the gas purity analyzer on the branch gas outlet pipeline, the pressure sensor is used to measure the pressure of the reduced sample gas and transmit corresponding pressure measurement data to an upper computer for storage, and the upper computer is used to trigger a safety protection mechanism when the pressure measurement data is greater than the safety pressure of the gas purity analyzer.

[0013] In a possible implementation, the pressure sensor is arranged at the outlet of the pressure reducing valve.

[0014] In a possible implementation, the measuring system further comprises a safety relief valve arranged between the pressure reducing valve and the filter, the safety relief valve being configured to discharge part of the sample gas when the pressure of the sample gas is greater than a preset relief value, the preset relief value being determined according to a maximum safety pressure of the gas purity analyzer.

[0015] In a possible implementation, the safety relief valve is arranged between the pressure reducing valve and the pressure sensor.

[0016] In a possible implementation, a gas flow sensor is further arranged on the branch gas outlet pipeline between the gas flow controller and the gas purity analyzer, the gas flow sensor being configured to measure the flow of the sample gas entering the gas purity analyzer and transmit corresponding flow measurement data to the host computer for storage.

[0017] In a possible implementation, the sample gas sampling port is arranged at the gas outlet, and a main road gas-liquid separator is arranged downstream of the sample gas sampling port on the main road gas outlet pipeline, the main road gas-liquid separator being configured to separate gas and liquid of the gas flowing out of the gas outlet.

[0018] In summary, the application provides a measurement system for electrolytic cell gas purity, which is applied to a hydrogen production device. The hydrogen production device comprises a gas outlet, and a main outlet pipeline is arranged on the gas outlet. The main outlet pipeline has a main gas outlet at the end. An upstream of the main outlet pipeline is provided with a sample gas sampling port. A branch outlet pipeline is arranged on the sample gas sampling port. The branch outlet pipeline has a sample gas outlet at the end. The measurement system comprises: a branch gas-liquid separator and a condenser connected in sequence and arranged on the upstream of the branch outlet pipeline. The branch gas-liquid separator is used for gas-liquid separation of sample gas flowing out of the sample gas sampling port. The condenser is used for condensation and water removal of the sample gas. A pressure reducing valve, a filter, a dryer, a gas flow controller and a gas purity analyzer are connected in sequence and arranged on the downstream of the branch outlet pipeline. The pressure reducing valve is used for pressure reduction of the sample gas to meet the pressure requirement of the gas purity analyzer. The filter is used for filtration of the sample gas to prevent pollutants from entering the gas purity analyzer. The dryer is used for drying of the sample gas to meet the humidity requirement of the gas purity analyzer. The gas flow controller is used for adjusting the flow of the sample gas entering the gas purity analyzer to meet the flow requirement of the gas purity analyzer. The gas purity analyzer is used for gas purity analysis of the sample gas. A three-way valve is arranged on the branch outlet pipeline between the pressure reducing valve and the filter, and the three-way valve is connected with an air inlet interface. When the gas purity analysis of the sample gas is performed, the three-way valve is used to be in a normal position to make the sample gas flow in from the sample gas sampling port and flow out from the sample gas outlet. When the gas purity analysis of the sample gas is suspended or stopped, the three-way valve is used to be switched to a position to make inert gas flow in from the air inlet interface into the gas purity analyzer to make residual sample gas in the gas purity analyzer flow out from the sample gas outlet. Based on the above measurement system, the sample gas can be sampled from the gas produced by the hydrogen production device through the sample gas sampling port, and the sample gas is subjected to gas-liquid separation, condensation and water removal, pressure reduction, filtration, drying and flow control to obtain stable sample gas. Then, the purity analysis is performed by the gas purity analyzer. At the same time, when the gas purity analysis of the sample gas is suspended or stopped, the three-way valve connected with the air inlet interface can make inert gas flow in from the air inlet interface into the gas purity analyzer to make residual sample gas in the gas purity analyzer flow out from the sample gas outlet, thereby ensuring the accurate detection of the gas purity analyzer.

[0019] Other advantages of the application will be illustrated in more detail in conjunction with the following description and drawings.

[0020] It should be understood that the above description is only a summary of the technical solutions of the application, so as to enable a general understanding of the technical means of the application, and then the content of the description is implemented. In order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced. The drawings herein are incorporated into the description and form a part of the description, which show the embodiments consistent with the present application, and are used to explain the technical solutions of the present application together with the description. It should be understood that the drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope of protection, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings. Moreover, the same reference numerals are used to represent the same components throughout the drawings. In the drawings:

[0022] Figure 1 A structure schematic diagram of a measuring system for gas purity of an electrolytic cell provided by the embodiments of the present application;

[0023] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0024] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to more thoroughly understand the present application, and to fully convey the scope of the present application to those skilled in the art.

[0026] In the description of the embodiments of the present application, it should be understood that terms such as "include" or "have" are intended to indicate that the features, numbers, components, parts or combinations thereof disclosed in the specification exist, and do not exclude the possibility of existence of one or more other features, numbers, components, parts or combinations thereof.

[0027] Unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" herein only describes the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone.

[0028] The terms "first", "second", etc. are used only for the purpose of distinguishing similar or identical technical features, and cannot be understood as indicating or implying relative importance or quantity of the technical features. Thus, the features defined by "first", "second", etc. can explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, the term "a plurality of" means two or more, unless otherwise specified.

[0029] The main equipment for measuring gas purity in the related art includes gas chromatography, thermal conductivity analyzer, electrochemical sensor reaction analyzer, photoelectric type analyzer, etc. Various gas purity analyzers, when the gas generated by the hydrogen production equipment is analyzed by the gas purity analyzer, the measured gas is easy to remain in the gas purity analyzer, thereby causing interference to the subsequent gas purity analysis.

[0030] In view of this, the present application provides a measurement system for electrolyzer gas purity, which can sample the gas generated by the hydrogen production equipment through the sample gas sampling port to obtain sample gas, and perform gas-liquid separation, condensation water removal, pressure reduction, filtration, drying and flow control on the sample gas, and then perform purity analysis through the gas purity analyzer. At the same time, through the three-way valve connected with the gas inlet interface, when the gas purity analysis of the sample gas is stopped or terminated, the inert gas flows from the gas inlet interface into the gas purity analyzer to flow the residual sample gas in the gas purity analyzer out of the sample gas outlet, thereby ensuring the accurate detection of the gas purity analyzer.

[0031] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0032] As shown in Figure 1 The present application provides a measurement system for electrolyzer gas purity, which is applied to a hydrogen production equipment, and the hydrogen production equipment includes a gas outlet, the gas outlet is provided with a main outlet pipeline 101, the end of the main outlet pipeline 101 is provided with a main gas outlet 18, the upstream of the main outlet pipeline 101 is provided with a sample gas sampling port 1, the sample gas sampling port 1 is arranged on the upstream of the main outlet pipeline 101, so that the gas path is shortened, the gas replacement time is shortened, and the change of the gas composition can be detected faster, the sample gas sampling port 1 is provided with a branch outlet pipeline 102, the end of the branch outlet pipeline 102 is provided with a sample gas outlet 2, and the measurement system comprises:

[0033] A branch gas-liquid separator 3 and a condenser 4 connected in sequence are arranged on the upstream of the branch outlet pipeline 102, the branch gas-liquid separator 3 is used for gas-liquid separation of the sample gas flowing out of the sample gas sampling port 1, and the condenser 4 is used for condensation water removal of the sample gas.

[0034] The sample gas flowing out of the sample gas sampling port 1 can be subjected to gas-liquid separation and condensation to remove water, so that the temperature of the sample gas meets the temperature requirement of the gas purity analyzer. In actual application, the branch gas-liquid separator 3 and the condenser 4 can be converted with each other.

[0035] The sequentially connected pressure reducing valve 5, filter 6, dryer 7, gas flow controller 8 and gas purity analyzer 9 are arranged downstream of the branch outlet gas pipeline 102; the pressure reducing valve 5 is used to reduce the pressure of the sample gas to meet the pressure requirement of the gas purity analyzer 9, the filter 6 is used to filter the sample gas to prevent contaminants from entering the gas purity analyzer 9, the dryer 7 is used to dry the sample gas to meet the humidity requirement of the gas purity analyzer 9, in actual application, the type of the dryer 7 can be molecular sieve, color-changing silica gel, etc., the gas flow controller 8 is used to adjust the flow of the sample gas entering the gas purity analyzer 9 to meet the flow requirement of the gas purity analyzer 9, and the gas purity analyzer 9 is used to analyze the gas purity of the sample gas.

[0036] In view of the fact that when the gas purity analyzer 9 is used to analyze the gas purity of the gas generated by the hydrogen production equipment, the measured gas is easy to remain in the gas purity analyzer 9, thereby interfering with the subsequent gas purity analysis, a three-way valve 10 is arranged between the pressure reducing valve 5 and the filter 6 on the branch outlet gas pipeline 102, and the three-way valve 10 is connected with the gas inlet interface 11; when the gas purity of the sample gas is analyzed, the three-way valve 10 is used to be in the normal position to make the sample gas flow in from the sample gas sampling port 1 and flow out from the sample gas outlet 2; when the gas purity analysis of the sample gas is suspended or stopped, the three-way valve 10 is used to be switched to make the inert gas flow in from the gas inlet interface 11 to the gas purity analyzer 9 to make the residual sample gas in the gas purity analyzer 9 flow out from the sample gas outlet 2, that is, by switching the position of the three-way valve 10, closing the passage of the sample gas, making the inert gas (for example, nitrogen) flow in from the gas inlet interface 11, and replacing the residual sample gas in the gas purity analyzer 9, so as to achieve the purpose of purging the gas purity analyzer 9 with inert gas, thereby ensuring the accuracy of the purity analysis, and at the same time avoiding the use of consumables in the gas purity analyzer 9, prolonging the service life. In actual application, the three-way valve 10 can also be replaced by two independent on-off valves.

[0037] In a possible implementation, the gas inlet interface 11 is connected with a standard gas source, and the three-way valve 10 is used to be switched to make the standard gas flow in from the gas inlet interface 11 to the gas purity analyzer 9 and flow out from the sample gas outlet 2, so as to calibrate and calibrate the gas purity analyzer 9.

[0038] When the gas purity analyzer 9 needs to be calibrated and calibrated, the position of the three-way valve 10 is the same as the purging position, so that the standard gas can flow into the gas purity analyzer 9 from the gas inlet interface 11 to implement the calibration and calibration of the gas purity analyzer 9. The configuration of the three-way valve 10 greatly improves the convenience of the calibration and calibration of the gas purity analyzer 9.

[0039] In a possible implementation, a first switch valve 12 is further arranged on the branch gas outlet pipeline 102 between the condenser 4 and the gas purity analyzer 9, and a second switch valve 13 is further arranged on the branch gas outlet pipeline 102 at the outlet of the gas purity analyzer 9; when the gas purity of the sample gas is analyzed, the first switch valve 12 and the second switch valve 13 are both in an open state to ensure that the sample gas can be normally introduced into the gas purity analyzer 9; when the gas purity analysis of the sample gas is suspended or stopped, the first switch valve 12 and the second switch valve 13 are both in a closed state, so that both ends of the gas purity analyzer 9 are kept in a sealed state, thereby preventing external air from entering the gas purity analyzer 9 and affecting the service life and stability of the gas purity analyzer 9.

[0040] In a possible implementation, the first switch valve 12 is arranged at the inlet of the gas purity analyzer 9, so as to better protect the gas purity analyzer 9.

[0041] In a possible implementation, considering that when the electrolytic cell is tested in a dynamic working condition, especially when the gas production back pressure changes, if the pressure state of the sample gas cannot be obtained in time, the gas purity analyzer 9 will be damaged once overpressure occurs, on the basis of the pressure reducing valve 5 arranged on the branch gas outlet pipeline 102, a pressure sensor 14 is further arranged on the branch gas outlet pipeline 102 between the pressure reducing valve 5 and the gas purity analyzer 9. The pressure sensor 14 is used for measuring the pressure of the sample gas after pressure reduction and transmitting corresponding pressure measurement data to an upper computer for storage. The upper computer is used for triggering a safety protection mechanism when the pressure measurement data is greater than the safety pressure of the gas purity analyzer 9. The safety protection mechanism can include issuing a warning or automatically stopping measurement when the pressure measurement data is greater than the safety pressure of the gas purity analyzer 9.

[0042] In a possible implementation, in order to be able to measure the sample gas after pressure reduction in time, the pressure sensor 14 can be arranged at the outlet of the pressure reducing valve 5.

[0043] In a possible implementation, in view of the potential safety hazards such as pressure out of control, damage to the instrument, and personal injury when the pressure reducing valve 5 fails to reduce pressure, the measuring system further comprises a safety relief valve 15 arranged between the pressure reducing valve 5 and the filter 6, the safety relief valve 15 being configured to discharge part of the sample gas when the pressure of the sample gas is greater than a preset relief value, the preset relief value being determined according to the maximum safe pressure of the gas purity analyzer 9, so as to prevent damage to the gas purity analyzer 9 caused by excessively high pressure. In actual application, the safety relief valve 15 and the pressure sensor 14 can be provided with an interlocking mechanism, and a warning or automatic test stop can be triggered when the pressure measurement data measured by the pressure sensor 14 is greater than the set threshold of the safety relief valve 15.

[0044] In a possible implementation, the safety relief valve 15 is arranged between the pressure reducing valve 5 and the pressure sensor 14.

[0045] In a possible implementation, although the flow rate of the sample gas can be adjusted by the gas flow controller 8, the actual flow rate value is not collected, and the flow rate fluctuation of the sample gas cannot be truly reflected. However, the measurement result of some types of gas purity analyzers 9 (for example, a thermal conductivity type gas purity analyzer) is obviously affected by the gas flow rate. In this case, the gas flow sensor 16 is further arranged on the branch gas outlet pipeline 102 between the gas flow controller 8 and the gas purity analyzer 9, the gas flow sensor 16 being configured to measure the flow rate of the sample gas entering the gas purity analyzer 9 and transmit corresponding flow rate measurement data to the upper computer for storage, so as to be able to trace the change of the flow rate measurement data and compare the flow rate measurement data with the result of the gas purity analysis. In actual application, an integrated device or instrument that has both flow rate control and flow rate detection functions, for example, a gas mass flow controller, can be used to replace the gas flow controller 8 and the gas flow sensor 16.

[0046] In a possible implementation, the sample gas sampling port 1 is arranged at the gas outlet, and the main road gas-liquid separator 17 is arranged downstream of the sample gas sampling port 1 on the main road gas outlet pipeline 101. The main road gas-liquid separator 17 is configured to perform gas-liquid separation on the gas flowing out of the gas outlet. By arranging the sample gas sampling port 1 directly at the gas outlet and sampling before the main road gas-liquid separation, the gas path of the sample gas is shortened, the gas replacement time of the branch gas outlet pipeline is shorter, and the real value can be measured more quickly when the gas purity changes.

[0047] The sample gas measurement in the embodiments of the present application is described below through overall examples:

[0048] The sample gas is drawn from the sample gas sampling port 1, separated and condensed by the gas-liquid separator 3 and the condenser 4, reduced in pressure by the pressure reducing valve 5, measured and recorded in pressure by the pressure sensor 14, filtered by the filter 6, dried by the dryer 7, controlled in flow by the gas flow controller 8, measured in flow by the gas flow sensor, and finally passed into the gas purity analyzer 9 for purity detection and discharged from the sample gas outlet 2. The safety relief valve 15 is a safety protection mechanism that opens when the pressure after reduction exceeds the limit value to release the pressure in the pipeline. The three-way valve 10 has two states. The normal state of the first and second on-off valves 12 and 13 is open to make the sample gas flow into the gas purity analyzer 9, and the inactivated state is closed to seal the gas purity analyzer 9.

[0049] It can be seen that the application provides a measurement system for electrolytic cell gas purity, which is applied to a hydrogen production device. The hydrogen production device comprises a gas outlet, and a main outlet pipeline is arranged on the gas outlet. The main outlet pipeline has a main gas outlet at the end. An upstream of the main outlet pipeline is provided with a sample gas sampling port. A branch outlet pipeline is arranged on the sample gas sampling port. The branch outlet pipeline has a sample gas outlet at the end. The measurement system comprises: a branch gas-liquid separator and a condenser connected in sequence and arranged upstream of the branch outlet pipeline; the branch gas-liquid separator is used for gas-liquid separation of sample gas flowing out of the sample gas sampling port, and the condenser is used for condensation and water removal of the sample gas; a pressure reducing valve, a filter, a dryer, a gas flow controller and a gas purity analyzer connected in sequence and arranged downstream of the branch outlet pipeline; the pressure reducing valve is used for pressure reduction of the sample gas to meet the pressure requirement of the gas purity analyzer, the filter is used for filtration of the sample gas to prevent pollutants from entering the gas purity analyzer, the dryer is used for drying of the sample gas to meet the humidity requirement of the gas purity analyzer, the gas flow controller is used for adjusting the flow of the sample gas entering the gas purity analyzer to meet the flow requirement of the gas purity analyzer, and the gas purity analyzer is used for gas purity analysis of the sample gas; a three-way valve is arranged between the pressure reducing valve and the filter on the branch outlet pipeline, and the three-way valve is connected with an air inlet interface; when the gas purity analysis of the sample gas is performed, the three-way valve is used to be in a normal position to make the sample gas flow in from the sample gas sampling port and flow out from the sample gas outlet; when the gas purity analysis of the sample gas is suspended or stopped, the three-way valve is used to switch positions to make inert gas flow into the gas purity analyzer from the air inlet interface to flow out residual sample gas in the gas purity analyzer from the sample gas outlet. Based on the above measurement system, the sample gas can be obtained by sampling the generated gas of the hydrogen production device through the sample gas sampling port, and the sample gas can be subjected to gas-liquid separation, condensation and water removal, pressure reduction, filtration, drying and flow control to obtain stable sample gas, and then the purity analysis is performed by the gas purity analyzer. At the same time, when the gas purity analysis of the sample gas is suspended or stopped, the three-way valve connected with the air inlet interface can make inert gas flow into the gas purity analyzer from the air inlet interface to flow out residual sample gas in the gas purity analyzer from the sample gas outlet, thereby ensuring the accurate detection of the gas purity analyzer.

[0050] In the description of the specification, descriptions made with reference to the terms "some possible embodiments", "some embodiments", "an example", "a specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application, and the above terms do not necessarily indicate the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples, without contradiction.

[0051] Although the spirit and principles of the present application have been described above with reference to a number of specific embodiments, it should be understood that the present application is not limited to the specific embodiments disclosed, and the division of aspects does not mean that the features in these aspects cannot be combined. The present application is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims.

Claims

1. A system for measuring the purity of gas produced by an electrolytic cell, characterized in that, The application is applied to a hydrogen production device, which comprises a gas outlet, a main outlet pipeline (101) is arranged on the gas outlet, the tail end of the main outlet pipeline (101) is provided with a main gas outlet (18), a sample gas sampling port (1) is arranged on the upstream of the main outlet pipeline (101), a branch outlet pipeline (102) is arranged on the sample gas sampling port (1), the tail end of the branch outlet pipeline (102) is provided with a sample gas outlet (2), and the measuring system comprises: A branch gas-liquid separator (3) and a condenser (4) are sequentially arranged on the upstream of the branch outlet pipeline (102); the branch gas-liquid separator (3) is used for carrying out gas-liquid separation on the sample gas flowing out of the sample gas sampling port (1), and the condenser (4) is used for condensing and removing water from the sample gas; A pressure reducing valve (5), a filter (6), a dryer (7), a gas flow controller (8) and a gas purity analyzer (9) are sequentially arranged on the downstream of the branch outlet pipeline (102); the pressure reducing valve (5) is used for reducing the pressure of the sample gas to meet the pressure requirement of the gas purity analyzer (9), the filter (6) is used for filtering the sample gas to prevent pollutants from entering the gas purity analyzer (9), the dryer (7) is used for drying the sample gas to meet the humidity requirement of the gas purity analyzer (9), the gas flow controller (8) is used for adjusting the flow of the sample gas entering the gas purity analyzer (9) to meet the flow requirement of the gas purity analyzer (9), and the gas purity analyzer (9) is used for analyzing the gas purity of the sample gas; A three-way valve (10) is arranged between the pressure reducing valve (5) and the filter (6) on the branch outlet pipeline (102), and the three-way valve (10) is connected with an air inlet interface (11); when the gas purity of the sample gas is analyzed, the three-way valve (10) is used to be in a normal position to make the sample gas flow in from the sample gas sampling port (1) and flow out from the sample gas outlet (2); when the gas purity analysis of the sample gas is suspended or stopped, the three-way valve (10) is used to be switched to a position to make inert gas flow in from the air inlet interface (11) to the gas purity analyzer (9) to make the residual sample gas in the gas purity analyzer (9) flow out from the sample gas outlet (2).

2. The system for measuring the purity of the gas produced by an electrolytic cell according to claim 1, characterized in that, The air inlet interface (11) is connected with a standard gas source, and the three-way valve (10) is used to be switched to a position to make standard gas flow in from the air inlet interface (11) to the gas purity analyzer (9) and flow out from the sample gas outlet (2) so as to calibrate and calibrate the gas purity analyzer (9).

3. The system for measuring the purity of the gas produced by an electrolytic cell according to claim 1, characterized in that, The branch gas outlet pipeline (102) is further provided with a first switch valve (12) between the condenser (4) and the gas purity analyzer (9), and is further provided with a second switch valve (13) at the outlet of the gas purity analyzer (9); when the gas purity of the sample gas is analyzed, the first switch valve (12) and the second switch valve (13) are both in an open state; when the gas purity analysis of the sample gas is suspended or stopped, the first switch valve (12) and the second switch valve (13) are both in a closed state.

4. The system for measuring the purity of the gas produced by an electrolytic cell according to claim 3, characterized in that, The first switch valve (12) is arranged at the inlet of the gas purity analyzer (9).

5. The system for measuring the purity of the gas produced by an electrolytic cell according to claim 1, characterized in that, The branch gas outlet pipeline (102) is further provided with a pressure sensor (14) between the pressure reducing valve (5) and the gas purity analyzer (9), the pressure sensor (14) is used for measuring the pressure of the sample gas after pressure reduction and transmitting corresponding pressure measurement data to an upper computer for storage, and the upper computer is used for triggering a safety protection mechanism when the pressure measurement data is greater than the safety pressure of the gas purity analyzer (9).

6. The system for measuring the purity of the gas produced by an electrolytic cell according to claim 5, characterized in that, The pressure sensor (14) is arranged at the outlet of the pressure reducing valve (5).

7. The system for measuring the purity of the gas produced by an electrolytic cell according to claim 5, characterized in that, The measurement system further comprises a safety relief valve (15) arranged between the pressure reducing valve (5) and the filter (6), the safety relief valve (15) is used for discharging part of the sample gas when the pressure of the sample gas is greater than a preset relief value, and the preset relief value is determined according to the maximum safety pressure of the gas purity analyzer (9).

8. The system for measuring the purity of the gas produced by an electrolytic cell according to claim 7, characterized in that, The safety relief valve (15) is arranged between the pressure reducing valve (5) and the pressure sensor (14).

9. The system for measuring the purity of the gas produced by an electrolytic cell according to claim 1, characterized in that, The branch gas outlet pipeline (102) is further provided with a gas flow sensor (16) between the gas flow controller (8) and the gas purity analyzer (9), the gas flow sensor (16) is used for measuring the flow of the sample gas entering the gas purity analyzer (9) and transmitting corresponding flow measurement data to an upper computer for storage.

10. The system for measuring the purity of gas produced by an electrolytic cell of claim 1, wherein, The sample gas sampling port (1) is arranged at the gas outlet, and a main road gas-liquid separator (17) is arranged downstream of the sample gas sampling port (1) on the main road gas outlet pipeline (101), and the main road gas-liquid separator (17) is used for gas-liquid separation of the gas flowing out of the gas outlet.

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