Method, system and device for testing gas transmission performance of electrolytic cell and medium

Abstract

The invention discloses a method, a system and a device for testing gas transmission performance of an electrolytic cell and a medium, and relates to the technical field of water electrolysis hydrogen production. Controlling the electrolytic bath to carry out water electrolysis reaction under a high-current condition, and collecting first flow data of the target gas from an exhaust pipeline of the electrolytic bath; after the electrolytic bath stably operates for a preset time under the high-current condition, the electrolytic bath is controlled to carry out water electrolysis reaction under the low-current condition, and second flow data of the target gas are collected from an exhaust pipeline of the electrolytic bath; in the internal structure of the electrolytic bath, the flow data of the discharged target gas are different when the water electrolysis reaction is carried out under different current conditions; and determining the gas transmission performance of the electrolytic cell according to the difference between the first flow data and the second flow data. The method can accurately test the gas transmission performance of the electrolytic cell.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a method, system, device and medium for testing gas transmission performance of an electrolyzer. Background Art

[0002] At present, all countries are developing energy in the direction of low carbonization and cleanness. As a clean and efficient energy carrier, the development of the green hydrogen industry is of great significance for reducing carbon emissions, achieving green, low-carbon and high-quality development, and achieving the dual carbon goals. At present, hydrogen production by electrolysis of water is the main method for producing green hydrogen.

[0003] Among them, gas transport is of great significance in the water electrolysis hydrogen production system, and efficient material transport plays a key role in improving the performance of the electrolyzer. The mass transfer performance is closely related to the transport of the generated gas. In order to further understand the actual situation of mass transfer, it is necessary to accurately measure the gas produced by water electrolysis. At present, the main research methods for the mass transfer performance of the water electrolysis system are numerical simulation and visualization experiments. However, the internal structure of the electrolyzer will affect the discharge of the electrolyzer gas, making the outlet gas not ideal, which will cause the measured gas transfer performance of the electrolyzer to be inaccurate.

[0004] Therefore, there is currently a lack of a method that can accurately test the gas transport performance of an electrolyzer. Summary of the invention

[0005] Based on this, it is necessary to provide a method, system, device and medium for testing the gas transmission performance of an electrolytic cell in response to the above-mentioned technical problems. The method can accurately test the gas transmission performance of the electrolytic cell.

[0006] The present invention adopts the following technical solutions:

[0007] The present invention provides a method for testing the gas transmission performance of an electrolytic cell, comprising:

[0008] Controlling the electrolytic cell to perform a water electrolysis reaction under a high current condition, and collecting first flow data of the target gas from an exhaust pipeline of the electrolytic cell;

[0009] After the electrolytic cell has been stably operated for a preset period of time under high current conditions, the electrolytic cell is controlled to perform a water electrolysis reaction under low current conditions, and second flow data of the target gas is collected from the exhaust pipeline of the electrolytic cell; in the internal structure of the electrolytic cell, the flow data of the target gas discharged when the water electrolysis reaction is performed under different current conditions are different;

[0010] A gas transport performance of the electrolyser is determined based on a difference between the first flow data and the second flow data.

[0011] Preferably, the exhaust pipeline is connected in series with a gas-liquid separation device, a gas drying tube, a gas flow meter and a gas mass spectrometer, and the flow data is the first flow data or the second flow data; the flow data of the target gas is collected from the exhaust pipeline of the electrolyzer, including:

[0012] Obtaining the gas flow rate collected by the gas flow meter, and the total gas pressure and target gas partial pressure collected by the gas mass spectrometer; the gas is the gas that passes through the exhaust pipeline, the gas-liquid separation device and the gas drying tube in sequence to reach the gas flow meter and the gas mass spectrometer; the gas includes the target gas and the non-target gas;

[0013] The flow data of the target gas is determined based on the gas flow rate, the total gas pressure and the target gas partial pressure.

[0014] Preferably, the flow data includes gas concentration and actual flow rate; determining the flow data of the target gas according to the gas flow rate, the total gas pressure and the target gas partial pressure includes:

[0015] The gas concentration of the target gas is calculated based on the target gas partial pressure and the total gas pressure;

[0016] According to the gas flow rate and gas concentration, the actual flow rate of the target gas is obtained.

[0017] Preferably, determining the gas transport performance of the electrolyser based on the difference between the first flow data and the second flow data comprises:

[0018] determining a gas transport performance coefficient based on a difference between the first gas concentration and the second gas concentration;

[0019] The gas transport performance of the electrolyzer is determined based on the gas transport performance coefficient.

[0020] Preferably, the gas transmission performance coefficient is calculated as follows:

[0021]

[0022] Where α is the gas transmission performance coefficient, c t0 is the first gas concentration, c t1 is the second gas concentration; the smaller the gas transmission performance coefficient, the worse the gas transmission performance of the electrolyzer.

[0023] Preferably, determining the gas transport performance of the electrolyser based on the difference between the first flow data and the second flow data comprises:

[0024] determining a gas transmission fluctuation coefficient according to a difference between the first actual flow rate and the second actual flow rate;

[0025] The gas transmission performance of the electrolyzer is determined based on the gas transmission fluctuation coefficient.

[0026] Preferably, the gas transmission fluctuation coefficient is calculated as follows:

[0027]

[0028] Where σ represents the gas transmission fluctuation coefficient, N is the number of actual flow rates, Q i is the ith actual flow, Q a is the average value of all actual flow rates; the gas transmission fluctuation coefficient is larger, the worse the gas transmission performance of the electrolyzer is.

[0029] The present invention provides a gas transmission performance test system for an electrolytic cell, the system comprising a gas-liquid separation device, a gas drying tube, a gas flow meter and a gas mass spectrometer which are sequentially connected in series on an exhaust pipeline of the electrolytic cell; the gas flow meter and the gas mass spectrometer are both connected to a computer device;

[0030] An electrolyzer, used for performing a water electrolysis reaction to generate a target gas through the water electrolysis reaction; the target gas is oxygen or hydrogen;

[0031] Gas-liquid separation equipment, used to separate the liquid in the exhaust pipe of the electrolyzer from the generated gas, and transport the separated gas to the gas drying pipe through the pipeline;

[0032] Gas drying tube, used to dry the gas after gas-liquid separation;

[0033] Gas flow meters, which collect the gas flow through the pipeline and record it on a computer device;

[0034] A gas mass spectrometer collects the partial pressure of each component of the gas passing through the pipeline and records it on a computer device;

[0035] A computer device is used to control an electrolytic cell to perform a water electrolysis reaction under a high current condition and collect first flow data of a target gas from an exhaust pipe of the electrolytic cell; after the electrolytic cell has been stably operating under the high current condition for a preset period of time, the electrolytic cell is controlled to perform a water electrolysis reaction under a low current condition and collect second flow data of the target gas from the exhaust pipe of the electrolytic cell; the gas transmission performance of the electrolytic cell is determined based on the difference between the first flow data and the second flow data; in the internal structure of the electrolytic cell, the flow data of the discharged target gas is different when the water electrolysis reaction is performed under different current conditions.

[0036] The present invention provides a gas transmission performance testing device for an electrolytic cell, the device comprising a gas-liquid separation device, a gas drying tube, a gas flow meter and a gas phase mass spectrometer which are sequentially connected in series on the exhaust pipeline of the electrolytic cell; the gas flow meter and the gas phase mass spectrometer are both connected to a computer device;

[0037] An electrolyzer, used for performing a water electrolysis reaction to generate a target gas through the water electrolysis reaction; the target gas is oxygen or hydrogen;

[0038] Gas-liquid separation equipment, used to separate the liquid in the exhaust pipe of the electrolyzer from the generated gas, and transport the separated gas to the gas drying pipe through the pipeline;

[0039] Gas drying tube, used to dry the gas after gas-liquid separation;

[0040] Gas flow meters, which collect the gas flow through the pipeline and record it on a computer device;

[0041] A gas mass spectrometer collects the partial pressure of each component of the gas passing through the pipeline and records it on a computer device;

[0042] A computer device is used to control an electrolytic cell to perform a water electrolysis reaction under a high current condition and collect first flow data of a target gas from an exhaust pipe of the electrolytic cell; after the electrolytic cell has been stably operating under the high current condition for a preset period of time, the electrolytic cell is controlled to perform a water electrolysis reaction under a low current condition and collect second flow data of the target gas from the exhaust pipe of the electrolytic cell; in the internal structure of the electrolytic cell, different flow data of the target gas discharged when the water electrolysis reaction is performed under different current conditions; and based on the difference between the first flow data and the second flow data, the gas transmission performance of the electrolytic cell is determined.

[0043] The present invention provides a computer device readable storage medium, wherein the storage medium stores a computer device program, and when the computer device program is executed by a processor, the gas transmission performance test method of the electrolytic cell is implemented.

[0044] The present invention provides a computer device, comprising a memory, a processor, and a computer device program stored in the memory and executable on the processor, wherein the processor implements the gas transmission performance test method of the electrolyzer when executing the program.

[0045] At least one of the above technical solutions adopted by the present invention can achieve the following beneficial effects:

[0046] In the present invention, the electrolytic cell is controlled to perform water electrolysis reaction under high current conditions, and the first flow data of the target gas is collected from the exhaust pipe of the electrolytic cell; after the electrolytic cell electrolyzes water under high current conditions for a preset period of time, the electrolytic cell is controlled to perform water electrolysis reaction under low current conditions, and the second flow data of the target gas is collected in the exhaust pipe of the electrolytic cell; because under high current conditions, the target gas generation amount is high, the gas will continue to be stably discharged from the flow field structure of the electrolytic cell, and the first flow data of the target gas discharged from the exhaust pipe of the electrolytic cell will be maintained at a higher value, and when switching to low current conditions, due to the difference in the internal structure of the electrolytic cell, the target gas generation amount is reduced, that is, the second flow data of the target gas discharged from the exhaust pipe of the electrolytic cell will be reduced. Therefore, the transmission obstruction to the target gas in the electrolytic cell can be characterized according to the difference between the first flow data and the second flow data, thereby determining the gas transmission performance of the electrolytic cell. The present invention fills the gap that the traditional measurement method cannot directly and effectively measure the gas transmission performance of the electrolytic cell, and realizes quantitative analysis of the gas transmission performance of the electrolytic cell through the flow data of the target gas, thereby improving the accuracy of measuring the gas transmission performance of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0048] Figure 1 A schematic diagram of the structure of a gas transmission performance testing system for an electrolyzer provided by the present invention;

[0049] Figure 2 A schematic flow chart of a method for testing gas transmission performance of an electrolytic cell provided by the present invention;

[0050] Figure 3 A schematic flow chart of another method for testing gas transmission performance of an electrolytic cell provided by the present invention;

[0051] Figure 4 An oxygen concentration curve diagram of an electrolytic cell 1 and an electrolytic cell 2 provided by the present invention;

[0052] Figure 5 A real-time oxygen flow curve diagram of an electrolytic cell 1 and an electrolytic cell 2 provided by the present invention;

[0053] Figure 6 A schematic diagram of a computer device for implementing a method for testing gas transmission performance of an electrolytic cell provided by the present invention.

[0054] Description of reference numerals:

[0055] 100. Gas transmission performance test system of electrolytic cell; 101. electrolytic cell; 101. electrolytic cell; 102. gas-liquid separation equipment; 103. gas drying tube; 104. gas flow meter; 105. gas mass spectrometer; 106. computer equipment. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] During the electrolysis of water, the gas produced contains impurities, so it is necessary to accurately analyze the composition of the exhaust gas. In addition, the internal structure of the electrolyzer will also affect the exhaust of the gas, making the outlet gas not ideal. It is necessary to accurately measure the gas flow data to analyze the gas mass transfer in the electrolyzer in detail.

[0058] Based on this, the present invention provides a method for testing the gas transmission performance of an electrolytic cell, which accurately measures the gas transmission performance of the electrolytic cell through the flow data of the target gas before and after the operating parameters of the electrolytic cell change.

[0059] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0060] First, a gas transmission performance test system for an electrolyzer provided by the present invention is described. Figure 1 As shown, the system 100 includes a gas-liquid separation device 102, a gas drying tube 103, a gas flow meter 104 and a gas mass spectrometer 105 which are sequentially connected in series on the exhaust pipeline of the electrolytic cell 101; the gas flow meter 104 and the gas mass spectrometer 105 are both connected to a computer device 106.

[0061] The electrolytic cell 101 is used to perform a water electrolysis reaction to generate a target gas through the water electrolysis reaction; the target gas is oxygen or hydrogen.

[0062] The gas-liquid separation device 102 is used to separate the liquid in the exhaust pipe of the electrolyzer from the generated gas, and transport the separated gas to the gas drying pipe 103 through a pipeline.

[0063] The gas drying tube 103 is used to dry the gas after gas-liquid separation.

[0064] The gas flow meter 104 collects the gas flow through the pipeline and records it on the computer device 106.

[0065] The gas mass spectrometer 105 collects the partial pressure of each component of the gas passing through the pipeline and records it on the computer device 106.

[0066] Computer device 106 is used to control the electrolytic cell to perform water electrolysis reaction under high current conditions, and collect first flow data of the target gas from the exhaust pipe of the electrolytic cell; when the electrolytic cell has been stably operating under high current conditions for a preset period of time, control the electrolytic cell to perform water electrolysis reaction under low current conditions, and collect second flow data of the target gas from the exhaust pipe of the electrolytic cell; determine the gas transmission performance of the electrolytic cell based on the difference between the first flow data and the second flow data; in the internal structure of the electrolytic cell, the flow data of the discharged target gas is different when the water electrolysis reaction is performed under different current conditions.

[0067] Among them, the gas drying tube further dries the gas after gas-liquid separation, which can reduce the impact of moisture and reduce the damage to subsequent precision equipment after water vapor condensation.

[0068] It should be noted that the electrolyzer conducts a water electrolysis experiment to electrolyze water into hydrogen and oxygen. Therefore, the electrolyzer has two exhaust pipes, with two sets of gas-liquid separation equipment 102, gas drying tube 103, gas flow meter 104 and gas mass spectrometer 105; one set can collect hydrogen flow data, and the other set can collect oxygen flow data, that is, one gas drying tube can be a hydrogen dehydration device, and one gas drying tank can be an oxygen dehydration device, such as Figure 1 shown.

[0069] Before taking measurements, the electrolytic cell may be started to perform a water electrolysis reaction so that the generated gas can remove the residual gas in the system pipeline and the system can reach a stable state.

[0070] Start measuring and turn on the data acquisition function of the gas flow meter and the gas mass spectrometer. When the electrolyzer is running stably, first maintain stable high current conditions, collect the first flow data of the target gas through the gas flow meter and the gas mass spectrometer, and after a period of stable operation, switch the parameters to another set of stable low current conditions with lower current conditions, and collect the second flow data of the target gas through the gas flow meter and the gas mass spectrometer. In this way, the gas flow data of the target gas before and after the operating parameters change can be collected to accurately measure the gas transmission performance of the electrolyzer; wherein, the target gas can be hydrogen or oxygen.

[0071] Based on the gas transmission performance test system of the electrolyzer, the gas transmission performance test method of the electrolyzer provided by the present invention is described below with the above-mentioned computer device as the execution subject. In an exemplary embodiment, Figure 2 As shown, this embodiment includes the following steps:

[0072] S201, controlling the electrolytic cell to perform a water electrolysis reaction under a high current condition, and collecting first flow data of the target gas from an exhaust pipeline of the electrolytic cell.

[0073] The cell is allowed to reach an internal steady state before being controlled to operate at a high current condition, which may be 1A / cm2.

[0074] The flow data is the first flow data or the second flow data; the flow data of the target gas is collected from the exhaust pipeline of the electrolytic cell, including: obtaining the gas flow collected by the gas flowmeter, and the total gas pressure and the target gas partial pressure collected by the gas mass spectrometer; the gas is the gas that passes through the exhaust pipeline, the gas-liquid separation equipment and the gas drying tube in sequence to reach the gas flowmeter and the gas mass spectrometer; the gas includes the target gas and the non-target gas; the flow data of the target gas is determined according to the gas flow, the total gas pressure and the target gas partial pressure.

[0075] Optionally, the flow data includes gas concentration and actual flow rate; determining the flow data of the target gas based on the gas flow rate, total gas pressure and target gas partial pressure, including: calculating the gas concentration of the target gas based on the target gas partial pressure and total gas pressure; obtaining the actual flow rate of the target gas based on the gas flow rate and gas concentration.

[0076] Therefore, the first flow data of the target gas is collected from the exhaust pipeline of the electrolytic cell, including: obtaining the gas flow collected by the gas flowmeter, and the total gas pressure and the target gas partial pressure collected by the gas mass spectrometer; the gas is the gas that passes through the exhaust pipeline, the gas-liquid separation equipment and the gas drying tube in sequence to reach the gas flowmeter and the gas mass spectrometer; the gas includes the target gas and the non-target gas; the first flow data of the target gas is determined according to the gas flow, the total gas pressure and the target gas partial pressure.

[0077] The first flow data includes gas concentration and actual flow rate; the flow data of the target gas is determined according to the gas flow rate, total gas pressure and target gas partial pressure, including: calculating the gas concentration of the target gas according to the target gas partial pressure and total gas pressure; and obtaining the actual flow rate of the target gas according to the gas flow rate and gas concentration.

[0078] Taking oxygen as the target gas as an example, when the test starts, the data acquisition function of the gas flow meter and the gas mass spectrometer is turned on to collect the real-time gas flow data Q of the generated gas and the partial pressure data P of each component gas. n , where the partial pressure of oxygen is P m The computer equipment collects the gas flow Q and the partial pressure data of each gas component P n , calculate the gas concentration ρ of oxygen in the generation and the actual flow rate Q of oxygen m .

[0079] Furthermore, the gas concentration of oxygen measured is calculated as follows: according to the total pressure P of all gases and the oxygen partial pressure P measured by the gas mass spectrometer m , calculate the oxygen concentration ρ at this moment: ρ = P m / P; Calculate the actual flow rate Q of the produced oxygen based on the measured gas composition o =ρQ.

[0080] It should be noted that the non-target gas is the impurity gas; if the target gas is oxygen, the gas drying tube is an oxygen dehydration device.

[0081] S202, after the electrolytic cell has been running stably under high current conditions for a preset period of time, the electrolytic cell is controlled to perform water electrolysis reaction under low current conditions, and second flow data of the target gas is collected from the exhaust pipe of the electrolytic cell; in the internal structure of the electrolytic cell, the flow data of the target gas discharged when the water electrolysis reaction is performed under different current conditions are different.

[0082] The second flow data includes gas concentration and actual flow rate; the operation is maintained under stable high current conditions. After a period of stable operation, the electrolyzer is switched to low current conditions to electrolyze water, and the gas component partial pressure and gas flow rate information before and after the operating current changes are collected to calculate the gas concentration and actual flow rate of the target gas before and after the operating parameters change. The method for calculating the second flow data of the target gas is the same as the method for calculating the first flow data of the target gas described above, and this embodiment will not be repeated here. Among them, the low current condition can be a current of 0.2A / cm2.

[0083] S203, determining the gas transmission performance of the electrolytic cell according to the difference between the first flow data and the second flow data.

[0084] By calculating the gas concentration and actual flow rate of the target gas before and after the operating parameter changes, the changes in gas concentration and actual flow rate before and after the operating parameter changes are analyzed, and the gas production and transportation of the electrolyzer are analyzed.

[0085] In one embodiment, the gas transmission performance of the electrolyzer is determined based on the difference between the first flow data and the second flow data, including: determining the gas transmission performance coefficient based on the difference between the first gas concentration and the second gas concentration; determining the gas transmission performance of the electrolyzer based on the gas transmission performance coefficient.

[0086] The gas transmission performance in the electrolyzer system can be quantitatively judged by the difference in oxygen concentration in the anode generated gas before and after the operating parameters change. Under high current conditions, due to the high oxygen generation, the gas will continue to be discharged from the flow field structure in a stable manner, so the oxygen concentration will be maintained at a high value. When switching to low current conditions, the oxygen generation decreases, the originally stable oxygen emission state is broken, and a new stable state under low current conditions will be reached again. Under low current conditions, due to differences in internal mass transfer structures, the desorption and discharge of bubbles are more obviously affected. When oxygen transmission is blocked, the oxygen concentration will decrease accordingly. When the operating parameters are switched from high current to low current, the greater the difference in gas concentration, the more transmission obstacles the generated oxygen encounters, and the worse the gas transmission performance; therefore, the calculation method of the gas transmission performance coefficient can be:

[0087]

[0088] Where α is the gas transmission performance coefficient, c t0 is the first gas concentration, c t1 is the second gas concentration; its minimum value is The maximum value is 1. The larger the value of α is, the better the gas transmission performance of the electrolyzer is. When the value of α is smaller, the gas transmission performance of the electrolyzer is worse.

[0089] In order to further analyze the gas transport characteristics, the present invention can also directly analyze the gas accumulation phenomenon inside the electrolytic cell. Bubbles will undergo a series of steps such as nucleation, desorption, and aggregation inside the electrolytic cell. The bubbles are not discharged uniformly as countless tiny bubbles, but in the form of bubbly flow, slug flow, annular flow, etc., resulting in gas transport not being a stable value, but a fluctuating value. The more severe the fluctuation, the more serious the gas accumulation inside. By calculating the gas transport fluctuation during the gas transport process, the accumulation of bubbles inside the electrolytic cell can be quantitatively judged. The greater the fluctuation characteristics of gas transport, the more serious the gas accumulation inside the electrolytic cell.

[0090] Therefore, determining the gas transmission performance of the electrolyzer based on the difference between the first flow data and the second flow data can also include: determining the gas transmission fluctuation coefficient based on the difference between the first actual flow rate and the second actual flow rate; determining the gas transmission performance of the electrolyzer based on the gas transmission fluctuation coefficient.

[0091] Optionally, the gas transmission fluctuation coefficient is calculated as:

[0092]

[0093] Where σ represents the gas transmission fluctuation coefficient, N is the number of actual flow rates, Q iis the ith actual flow, Q a is the average value of all actual flow rates; the gas transmission fluctuation coefficient is larger, the worse the gas transmission performance of the electrolyzer is.

[0094] In an exemplary embodiment, the present invention also provides a real-time dynamic monitoring method for gas production by water electrolysis, such as Figure 3 As shown, the following steps are included:

[0095] S301, before testing, start the electrolytic cell and run it under constant conditions to discharge the residual gas in the system pipeline so that the inside of the pipeline reaches a stable state.

[0096] S302, when the test starts, the data acquisition function of the gas flow meter and the gas mass spectrometer is turned on to collect the real-time gas flow data Q of the generated gas and the partial pressure data P of each component gas n , where the target gas partial pressure is P m .

[0097] S303, through the collected gas flow data Q and gas component partial pressure data P n , calculate the concentration ρ of the target gas and the flow rate Q of the target gas during generation m .

[0098] In an exemplary embodiment, the present invention also provides a method for testing the gas transmission performance of an electrolyzer, comprising the following steps:

[0099] S401, firstly, the water electrolysis device is operated to remove the residual gas in the system pipeline, so that the inside of the system pipeline reaches a stable state, and the interference of the residual gas on the measurement result is eliminated;

[0100] S402, the water electrolysis device operates stably. First, it maintains stable parameter condition 1 for operation. After a period of stable operation, the parameters are switched to another set of stable parameter conditions 2 for operation. The gas component partial pressure and gas flow rate information before and after the operating parameters change are collected.

[0101] S403, calculating the gas concentration and gas flow rate before and after the operation parameter changes, analyzing the changes in gas concentration and gas flow rate before and after the operation parameter changes, and analyzing the gas production and transportation of the electrolytic cell.

[0102] In an exemplary embodiment, the change trends of oxygen concentration information and actual oxygen flow information over time are sorted and plotted, and the following is obtained: Figure 4 The oxygen concentration diagram shown and Figure 5 Actual oxygen flow diagram shown.

[0103] like Figure 4As shown, electrolytic cells under the same operating parameter conditions are selected, the difference in oxygen production concentration of the electrolytic cells before and after the operating conditions change is calculated, and the gas transmission performance coefficient of electrolytic cell 1 and electrolytic cell 2 is calculated.

[0104] The gas transport performance coefficient of electrolyzer 1 and electrolyzer 2 is calculated as follows:

[0105] Gas transport performance coefficient of electrolyzer 1

[0106] Gas transport performance coefficient of electrolyzer 2

[0107] It can be seen that the gas transmission performance coefficient α1 of the electrolytic cell 1 is greater than the gas transmission performance coefficient α2 of the electrolytic cell 2, so the electrolytic cell 1 has better gas transmission performance.

[0108] During the gas transport process, the instantaneous flow rate is not a stable value. Bubbles will undergo a series of steps such as nucleation, desorption, and aggregation inside the electrolytic cell. The bubbles are not discharged evenly as countless tiny bubbles, but in the form of bubbly flow, slug flow, annular flow, etc., resulting in the gas transport not being a stable value, but a fluctuating value. The more severe the fluctuation, the more serious the gas accumulation inside. Therefore, by calculating the gas transport fluctuation during the gas transport process, the accumulation of bubbles inside the electrolytic cell can be quantitatively determined. Figure 5 As shown, an electrolyzer under the same operating parameter conditions is selected to calculate the instantaneous gas fluctuation coefficient at the current moment.

[0109] The gas transport fluctuation coefficients for electrolyzer 1 and electrolyzer 2 are calculated as follows:

[0110] Gas transport fluctuation coefficient of electrolyzer 1

[0111] Gas transport fluctuation coefficient of electrolyzer 2

[0112] It can be seen that the gas transport fluctuation coefficient σ1 of electrolytic cell 1 is greater than the gas transport fluctuation coefficient σ2 of electrolytic cell 2. Therefore, the bubble discharge of electrolytic cell 1 is more stable, more small bubbles are discharged from electrolytic cell 1, and the gas transmission process is more uniform; while the bubble accumulation phenomenon in electrolytic cell 2 will be more serious, and the gas transmission process will be more unstable.

[0113] Optionally, the stable operation time required for exhausting the residual gas in the pipeline is 30 minutes; the stable operation time of the parameter conditions after starting the measurement is 10 minutes.

[0114] The present invention fills the gap that the mass transfer performance of the electrolytic water system cannot be directly and effectively measured in the traditional measurement method, and realizes the quantitative analysis of the mass transfer performance of the electrolytic water system through gas flow data.

[0115] The advantages of the present invention are:

[0116] The present invention collects and analyzes the generated gas by arranging a gas mass spectrometer, thereby realizing high-precision, high-reliability, fast-response, and long-term dynamic monitoring and analysis of the gas production flow rate of electrolyzed water.

[0117] It can realize accurate analysis of gas production in water electrolysis, thus conducting a more in-depth study of the material transport in the water electrolysis system.

[0118] It can realize the screening measurement of specific target gases and analyze special situations such as cross-gas inside the electrolyzer by detecting hydrogen on the anode side or oxygen on the cathode side.

[0119] The mass transfer performance inside the electrolyzer can be quantitatively analyzed by directly measuring the gas transmission in the electrolyzer.

[0120] The present invention adopts a gas mass spectrometer real-time monitoring method to achieve long-term, high-precision, and highly reliable dynamic measurement of gas production by water electrolysis. At the same time, it can also test the flow of hydrogen gas mixed in the anode outlet, or the flow of oxygen gas mixed in the cathode outlet, so as to analyze whether there is leakage inside the electrolyzer. The present invention can achieve the measurement of various component gases produced by water electrolysis.

[0121] When applying the gas transmission performance test method of the electrolytic cell provided by the present invention, it is not necessary to Figure 2 The steps are executed in the order shown. The specific execution order of the steps can be determined according to needs, and the present invention does not limit this.

[0122] The above is a method for testing the gas transmission performance of an electrolytic cell provided by one or more embodiments of the present invention. Based on the same idea, the present invention also provides a corresponding device for testing the gas transmission performance of an electrolytic cell, which includes a gas-liquid separation device, a gas drying tube, a gas flow meter and a gas mass spectrometer connected in series in the exhaust pipe of the electrolytic cell; the gas flow meter and the gas mass spectrometer are both connected to a computer device.

[0123] The electrolyzer is used to perform a water electrolysis reaction to generate a target gas through the water electrolysis reaction; the target gas is oxygen or hydrogen.

[0124] The gas-liquid separation equipment is used to separate the liquid in the exhaust pipe of the electrolyzer from the generated gas, and transport the separated gas to the gas drying pipe through the pipeline.

[0125] The gas drying tube is used to dry the gas after gas-liquid separation.

[0126] Gas flow meter, collects the gas flow through the pipeline and records it on computer equipment.

[0127] The gas mass spectrometer collects the partial pressure of each component of the gas passing through the pipeline and records it on a computer device.

[0128] A computer device is used to control an electrolytic cell to perform a water electrolysis reaction under a high current condition and collect first flow data of a target gas from an exhaust pipe of the electrolytic cell; after the electrolytic cell has been stably operating under the high current condition for a preset period of time, the electrolytic cell is controlled to perform a water electrolysis reaction under a low current condition and collect second flow data of the target gas from the exhaust pipe of the electrolytic cell; in the internal structure of the electrolytic cell, different flow data of the target gas discharged when the water electrolysis reaction is performed under different current conditions; and based on the difference between the first flow data and the second flow data, the gas transmission performance of the electrolytic cell is determined.

[0129] For the specific definition of the gas transmission performance test device of the electrolyzer, please refer to the definition of the gas transmission performance test method of the electrolyzer above, which will not be repeated here. Each module in the above-mentioned gas transmission performance test device of the electrolyzer can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0130] The present invention also provides a computer device readable storage medium, the storage medium stores a computer device program, and the computer device program can be used to execute the above Figure 2 A test method for the gas transport performance of an electrolyzer is provided.

[0131] The present invention also provides Figure 6 The structural diagram of the computer device shown in FIG. Figure 6 As shown, at the hardware level, the computer device includes a processor, an internal bus, a network interface, a memory, and a non-volatile memory, and may also include other hardware required for the business. The processor reads the corresponding computer device program from the non-volatile memory into the memory and then runs it to achieve the above Figure 2 A test method for the gas transport performance of an electrolyzer is provided.

[0132] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer device program, and the computer device program can be stored in a non-volatile computer device readable storage medium. When the computer device program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0133] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present invention.

Claims

1. A method for testing the gas transmission performance of an electrolytic cell, characterized in that: include: Controlling the electrolytic cell to perform a water electrolysis reaction under a high current condition, and collecting first flow data of the target gas from an exhaust pipeline of the electrolytic cell; After the electrolytic cell stably operates for a preset period of time under the high current condition, the electrolytic cell is controlled to perform a water electrolysis reaction under a low current condition, and second flow data of the target gas is collected from the exhaust pipeline of the electrolytic cell; in the internal structure of the electrolytic cell, different flow data of the target gas discharged when the water electrolysis reaction is performed under different current conditions; A gas transport performance of the electrolyser is determined based on a difference between the first flow data and the second flow data.

2. The method according to claim 1, characterized in that The exhaust pipeline is connected in series with a gas-liquid separation device, a gas drying tube, a gas flow meter and a gas mass spectrometer, and the flow data is the first flow data or the second flow data; the flow data of the target gas is collected from the exhaust pipeline of the electrolyzer, including: Obtaining the gas flow rate collected by the gas flow meter, and the total gas pressure and target gas partial pressure collected by the gas mass spectrometer; the gas is the gas that passes through the exhaust pipeline, the gas-liquid separation device and the gas drying tube in sequence to reach the gas flow meter and the gas mass spectrometer; the gas includes target gas and non-target gas; Flow data of the target gas is determined according to the gas flow rate, the total gas pressure and the target gas partial pressure.

3. The method according to claim 2, characterized in that The flow data includes gas concentration and actual flow rate; the flow data of the target gas is determined according to the gas flow rate, the total gas pressure and the target gas partial pressure, including: Calculating the gas concentration of the target gas according to the target gas partial pressure and the gas total pressure; The actual flow rate of the target gas is obtained according to the gas flow rate and the gas concentration.

4. The method according to claim 3, characterized in that Determining the gas transmission performance of the electrolyzer according to the difference between the first flow data and the second flow data includes: determining a gas transport performance coefficient based on a difference between the first gas concentration and the second gas concentration; The gas transmission performance of the electrolytic cell is determined according to the gas transmission performance coefficient.

5. The method according to claim 4, characterized in that The gas transmission performance coefficient is calculated as follows: Where α is the gas transmission performance coefficient, c t0 is the first gas concentration, c t1 is the second gas concentration; the smaller the gas transmission performance coefficient is, the worse the gas transmission performance of the electrolytic cell is.

6. The method according to claim 3, characterized in that Determining the gas transmission performance of the electrolyzer according to the difference between the first flow data and the second flow data includes: determining a gas transmission fluctuation coefficient according to a difference between the first actual flow rate and the second actual flow rate; The gas transmission performance of the electrolytic cell is determined according to the gas transmission fluctuation coefficient.

7. The method according to claim 6, characterized in that The gas transmission fluctuation coefficient is calculated as follows: Where σ represents the gas transmission fluctuation coefficient, N is the number of actual flow rates, Q i is the ith actual flow, Q a is the average value of all actual flow rates; the gas transmission fluctuation coefficient is larger, and the gas transmission performance of the electrolyzer is worse.

8. A gas transmission performance test system for an electrolyzer, characterized in that: The system comprises a gas-liquid separation device, a gas drying tube, a gas flow meter and a gas mass spectrometer which are sequentially connected in series on the exhaust pipeline of the electrolyzer; the gas flow meter and the gas mass spectrometer are both connected to a computer device; The electrolytic cell is used to perform a water electrolysis reaction to generate a target gas through a water electrolysis reaction; the target gas is oxygen or hydrogen; The gas-liquid separation device is used to separate the liquid in the exhaust pipe of the electrolyzer from the generated gas, and transport the separated gas to the gas drying pipe through a pipeline; The gas drying tube is used to dry the gas after the gas-liquid separation; The gas flow meter collects the gas flow through the pipeline and records it on the computer device; The gas mass spectrometer collects the partial pressure of each component of the gas passing through the pipeline and records it on the computer device; The computer device is used to control the electrolytic cell to perform water electrolysis reaction under high current conditions, and collect first flow data of the target gas from the exhaust pipe of the electrolytic cell through the gas flowmeter and the gas mass spectrometer; after the electrolytic cell has been stably operating for a preset period of time under the high current conditions, the electrolytic cell is controlled to perform water electrolysis reaction under low current conditions, and second flow data of the target gas is collected from the exhaust pipe of the electrolytic cell; based on the difference between the first flow data and the second flow data, the gas transmission performance of the electrolytic cell is determined; in the internal structure of the electrolytic cell, the flow data of the discharged target gas is different when the water electrolysis reaction is performed under different current conditions.

9. A gas transmission performance testing device for an electrolytic cell, characterized in that: The device comprises a gas-liquid separation device, a gas drying tube, a gas flow meter and a gas mass spectrometer which are sequentially connected in series on the exhaust pipeline of the electrolyzer; the gas flow meter and the gas mass spectrometer are both connected to a computer device; The electrolytic cell is used to perform a water electrolysis reaction to generate a target gas through a water electrolysis reaction; the target gas is oxygen or hydrogen; The gas-liquid separation device is used to separate the liquid in the exhaust pipe of the electrolyzer from the generated gas, and transport the separated gas to the gas drying pipe through a pipeline; The gas drying tube is used to dry the gas after the gas-liquid separation; The gas flow meter collects the gas flow through the pipeline and records it on the computer device; The gas mass spectrometer collects the partial pressure of each component of the gas passing through the pipeline and records it on the computer device; The computer device is used to control the electrolytic cell to perform water electrolysis reaction under high current conditions and collect first flow data of the target gas from the exhaust pipe of the electrolytic cell; after the electrolytic cell has been stably operating under the high current conditions for a preset period of time, the electrolytic cell is controlled to perform water electrolysis reaction under low current conditions and collect second flow data of the target gas from the exhaust pipe of the electrolytic cell; in the internal structure of the electrolytic cell, the flow data of the discharged target gas is different when the water electrolysis reaction is performed under different current conditions; and the gas transmission performance of the electrolytic cell is determined based on the difference between the first flow data and the second flow data.

10. A computer device readable storage medium, characterized in that: The storage medium stores a computer device program, and when the computer device program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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