Electrolytic efficiency test system and test method

Abstract

The invention provides an electrolytic efficiency test system and method, the electrolytic efficiency test system is suitable for testing the electrolytic efficiency of an electrolytic reaction of a water electrolysis device, and the electrolytic efficiency test system comprises: an acquisition module configured to acquire power supply parameters of a power supply module of the water electrolysis device; the liquid supply mechanism is configured to provide electrolyte into a liquid inlet mechanism of the water electrolysis device; the liquid level control assembly is configured to detect the liquid level of the electrolyte after part of the electrolyte carried in the gas generated by the electrolytic reaction is recycled in the electrolytic bath and the liquid inlet mechanism of the water electrolysis device, and control the liquid supply mechanism, so that the liquid level in the electrolytic bath and the liquid inlet mechanism is maintained at a preset value; a measuring mechanism configured to measure a change amount of the electrolyte in the liquid supply mechanism; and the processing module is configured to obtain the electrolytic efficiency of the electrolytic reaction within a preset time range based on the power supply parameters and the variation of the electrolyte.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to the technical field of hydrogen production by electrolysis of water, and in particular to an electrolysis efficiency testing system and testing method for hydrogen production by electrolysis of water. Background Art

[0002] The electrolysis efficiency of hydrogen production by water electrolysis refers to the utilization rate of electrical energy during the electrolysis process. The higher the electrolysis efficiency, the less electrical energy is lost as heat or other forms. Therefore, electrolysis efficiency is an important performance parameter for measuring water electrolysis equipment.

[0003] Currently, the theoretical hydrogen production corresponding to a preset amount of electricity is generally obtained under a preset amount of electricity. The actual hydrogen production is obtained by collecting the hydrogen generated by the electrolysis reaction, and the ratio of the actual hydrogen production to the theoretical hydrogen production is calculated to obtain the electrolysis efficiency of hydrogen production by electrolysis of water. However, due to the fluctuating pressure and temperature, the measurement of the volume of hydrogen generated by the electrolysis reaction is affected, resulting in inaccurate measurement of the actual hydrogen production, affecting the accuracy of the electrolysis efficiency test. Summary of the Invention

[0004] In view of this, the present disclosure provides an electrolysis efficiency testing system and testing method, which are used to at least partially solve the above technical problems and improve the accuracy of electrolysis efficiency testing.

[0005] In a first aspect of the present disclosure, an electrolysis efficiency testing system is provided, which is suitable for testing the electrolysis efficiency of an electrolysis reaction in an electrolysis device, comprising: an acquisition module configured to acquire power supply parameters of a power supply module of the electrolysis device; a liquid supply mechanism configured to provide electrolyte to a liquid inlet mechanism of the electrolysis device; a liquid level control component configured to detect the liquid level of the electrolyte after recovering a portion of the electrolyte carried in the gas generated by the electrolysis reaction in the electrolytic cell of the electrolysis device and the liquid inlet mechanism, and to control the liquid supply mechanism so that the liquid level in the liquid inlet mechanism is maintained at a preset value; a measuring mechanism configured to measure a change in the electrolyte in the liquid supply mechanism; and a processing module configured to obtain the electrolysis efficiency of the electrolysis reaction within a preset time range based on the power supply parameters and the change in the electrolyte.

[0006] According to an embodiment of the present disclosure, the measuring mechanism includes a weight measuring instrument configured to measure the weight difference of the liquid supply mechanism before and after the electrolysis reaction to obtain a change in the amount of the electrolyte.

[0007] According to an embodiment of the present disclosure, the measuring mechanism includes a liquid level meter installed in the liquid supply mechanism and configured to detect a change in the liquid level of the electrolyte in the liquid supply mechanism to obtain a change in the amount of the electrolyte.

[0008] According to an embodiment of the present disclosure, the measuring mechanism includes a flow meter configured to measure the flow rate of the electrolyte delivered by the liquid supply mechanism to the liquid inlet mechanism to obtain a change in the electrolyte.

[0009] According to an embodiment of the present disclosure, the power supply parameter includes at least one of current, voltage and power.

[0010] According to an embodiment of the present disclosure, the electrolysis efficiency testing system also includes a separation and recovery mechanism, which is connected to the exhaust end of the electrolytic cell of the water electrolysis device and the liquid inlet mechanism, and is constructed to receive the gas precipitated by the electrolysis reaction in the electrolytic cell, and separate part of the electrolyte carried in the gas and return it to the liquid inlet mechanism.

[0011] According to an embodiment of the present disclosure, the separation and recovery mechanism is constructed as a multi-stage gas-liquid separation to remove part of the electrolyte carried in the gas step by step.

[0012] According to an embodiment of the present disclosure, the separation and recovery mechanism further includes a condenser configured to condense a gaseous portion of the electrolyte in the gas into a liquid so as to separate the electrolyte from the gas.

[0013] A second aspect of the present disclosure provides a testing method for an electrolysis efficiency testing system, comprising: obtaining a theoretical consumption of the electrolyte in the electrolysis reaction based on power supply parameters within a preset time range in the electrolysis reaction; obtaining an actual consumption of the electrolyte in the electrolysis reaction based on a change in the electrolyte before and after the electrolysis reaction; and obtaining the electrolysis efficiency of the electrolysis reaction based on the actual consumption and the theoretical consumption.

[0014] According to an embodiment of the present disclosure, obtaining the theoretical consumption of the electrolyte in the electrolysis reaction includes: obtaining the amount of electricity of the electrolysis reaction based on the power supply parameters within a preset time range in the electrolysis reaction; obtaining the theoretical amount of hydrogen produced in the electrolysis reaction based on the amount of electricity; and obtaining the theoretical consumption of the electrolyte based on the theoretical amount of hydrogen produced.

[0015] According to an embodiment of the present disclosure, obtaining the change in the amount of the electrolyte before and after the electrolysis reaction includes: obtaining a first total weight after the liquid supply mechanism is filled with the electrolyte before the electrolysis reaction; obtaining a second total weight of the liquid supply mechanism when the electrolyte is maintained at a preset value after recovering part of the electrolyte carried in the gas generated by the electrolysis reaction in the electrolytic cell and the liquid inlet mechanism after the electrolysis reaction; and obtaining the change in the amount of the electrolyte before and after the electrolysis reaction based on the first total weight and the second total weight.

[0016] According to an embodiment of the present disclosure, obtaining the change in the amount of the electrolyte before and after the electrolysis reaction includes: obtaining a first liquid level after the electrolyte is filled in the liquid supply mechanism before the electrolysis reaction; obtaining a second liquid level of the electrolyte in the liquid supply mechanism when the electrolyte is maintained at a preset value after part of the electrolyte carried in the gas generated by the electrolysis reaction is recovered in the electrolytic cell and the liquid inlet mechanism after the electrolysis reaction; and obtaining the change in the amount of the electrolyte before and after the electrolysis reaction based on the first liquid level and the second liquid level.

[0017] According to an embodiment of the present disclosure, the electrolysis efficiency includes a ratio of the actual consumption to the theoretical consumption.

[0018] According to the electrolysis efficiency testing system and testing method provided by the present disclosure, within a preset time range, the acquisition module obtains the power supply parameters, and the processing module can obtain the theoretical amount of electricity required for the electrolysis reaction based on the power supply parameters, thereby obtaining the theoretical consumption of the electrolyte. The liquid supply mechanism provides electrolyte to the liquid inlet mechanism, so that the electrolyte level is maintained at a preset value after the electrolytic cell and the liquid inlet mechanism of the water electrolysis device recover part of the electrolyte carried in the gas generated by the electrolysis reaction. Among them, the part of the electrolyte carried in the gas is the electrolyte that does not participate in the electrolysis reaction, so the change in the electrolyte in the liquid supply mechanism represents the actual consumption of the electrolyte in the electrolysis reaction. The processing module obtains the electrolysis efficiency of the electrolysis reaction based on the ratio of the theoretical consumption of the electrolyte to the actual consumption. In the test method of obtaining the electrolysis efficiency by measuring the change in the electrolyte, since the electrolyte is less affected by temperature and pressure, the measurement accuracy of the change in the electrolyte is high, thereby improving the accuracy of the electrolysis efficiency test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0020] Figure 1 Schematically shows a principle diagram of an electrolysis efficiency testing system equipped with a water electrolysis device according to an embodiment of the present disclosure;

[0021] Figure 2 A flow chart schematically illustrates a testing method of an electrolysis efficiency testing system according to an embodiment of the present disclosure;

[0022] Figure 3 Schematically shows a flow chart for obtaining the theoretical consumption of electrolyte in an electrolysis reaction according to an embodiment of the present disclosure;

[0023] Figure 4 A flow chart schematically illustrates the change in the amount of electrolyte before and after the electrolysis reaction according to an embodiment of the present disclosure;

[0024] Figure 5 A flow chart schematically illustrates the change in the amount of electrolyte before and after the electrolysis reaction according to an embodiment of the present disclosure.

[0025] Reference numerals

[0026] 1. Liquid supply mechanism; 2. Water electrolysis device; 3. Liquid inlet mechanism; 4. Electrolytic cell; 5. Separation and recovery mechanism; 51. First separation component; 52. Second separation component; 53. Gas-liquid separator; 531. First gas-liquid separator; 532. Second gas-liquid separator; 54. Condenser. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0028] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of the features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0029] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0030] In the process of testing the electrolysis efficiency of hydrogen production by electrolysis of water, the theoretical hydrogen production corresponding to the preset power level is generally obtained under the preset power level. The actual hydrogen production is obtained by collecting the hydrogen generated by the electrolysis reaction. The ratio of the actual hydrogen production to the theoretical hydrogen production is calculated to obtain the electrolysis efficiency of hydrogen production by electrolysis of water. However, since pressure and temperature fluctuate, the measurement of the volume of hydrogen generated by the electrolysis reaction is affected, resulting in inaccurate measurement of the actual hydrogen production, affecting the accuracy of the electrolysis efficiency test.

[0031] Figure 1 The schematic diagram of the principle of the electrolysis efficiency testing system equipped with a water electrolysis device according to an embodiment of the present disclosure is schematically shown.

[0032] The embodiments of the present disclosure provide an electrolysis efficiency testing system suitable for testing the electrolysis efficiency of an electrolysis reaction of an electrolysis device 2, comprising an acquisition module, a liquid supply mechanism 1, a liquid level control component, a measuring mechanism, and a processing module. The acquisition module is configured to collect power supply parameters of the power supply module of the electrolysis device 2. The liquid supply mechanism 1 is configured to supply electrolyte to the liquid inlet mechanism 3 of the electrolysis device 2. The liquid level control component is configured to detect the liquid level of the electrolyte after recovering part of the electrolyte carried in the gas generated by the electrolysis reaction in the electrolytic cell 4 of the electrolysis device 2 and the liquid inlet mechanism 3, and control the liquid supply mechanism 1 so that the liquid level in the liquid inlet mechanism 3 is maintained at a preset value. The measuring mechanism is configured to measure the change in the amount of electrolyte in the liquid supply mechanism 1. The processing module is configured to obtain the electrolysis efficiency of the electrolysis reaction based on the power supply parameters and the change in the amount of electrolyte within a preset time range.

[0033] It should be noted that if Figure 1 As shown, the water electrolysis device 2 includes a power supply module, a liquid inlet mechanism 3 and an electrolytic cell 4. The liquid inlet mechanism 3 is respectively connected to the anode chamber and the cathode chamber of the electrolytic cell 4 to transport the electrolyte required for the electrolysis reaction to the anode chamber and the cathode chamber. The water electrolysis device 2 of this embodiment can be a large-scale water electrolysis device, and the liquid inlet mechanism 3 of the water electrolysis device 2 is in a fixed state and is not easy to carry or disassemble. The power supply module can be grid-powered, renewable energy-powered, or energy storage system-powered, etc. The positive pole of the power supply module is electrically connected to the anode of the electrolytic cell 4, and the negative pole of the power supply module is electrically connected to the cathode of the electrolytic cell 4, so that the electrolytic cell 4 undergoes an electrolysis reaction under the action of direct current, and hydrogen and oxygen are precipitated. Part of the electrolyte will be carried in the precipitated hydrogen and oxygen, and part of the electrolyte carried in the gas is the electrolyte that does not participate in the electrolysis reaction.

[0034] According to an embodiment of the present disclosure, a collection module collects power supply parameters from a power supply module. The power supply parameters may be parameters such as current, voltage, and / or power. The collection module may be an electric meter, an electricity meter, or the like, without limitation herein. Based on the power supply parameters, the processing module can determine the theoretical power required for the electrolysis reaction, the theoretical hydrogen production of the electrolysis reaction, and thus the theoretical consumption of the electrolyte.

[0035] The liquid supply mechanism 1 includes, but is not limited to, a liquid storage tank, a delivery pipe, and a delivery pump for storing the electrolyte and other substances required for the electrolysis reaction. The liquid supply mechanism 1 is connected to the liquid inlet mechanism 3 and can provide the electrolyte required for the electrolysis reaction to the liquid inlet mechanism 3 of the water electrolysis device 2. The liquid supply mechanism 1 is also easy to transport and disassemble.

[0036] Because some of the electrolyte carried in the gas produced by the electrolysis reaction is electrolyte that does not participate in the electrolysis reaction, after separating the carried-in electrolyte from the gas produced by the electrolysis reaction and recycling it into the liquid inlet mechanism 3, the liquid level control component controls the amount of electrolyte delivered to the liquid inlet mechanism 3 by the liquid supply mechanism 1, so that the liquid levels in the electrolytic cell 4 of the water electrolysis device 2 and the liquid inlet mechanism 3 are maintained at preset values. The change in the amount of electrolyte in the liquid supply mechanism 1 is regarded as the actual consumption of the electrolysis reaction. Therefore, the change in the amount of electrolyte in the liquid supply mechanism 1 measured by the measuring mechanism can represent the actual consumption of the electrolyte in the electrolysis reaction.

[0037] In such an embodiment, the processing module obtains the electrolysis efficiency of the electrolysis reaction based on the ratio of the theoretical consumption of the electrolyte to the actual consumption. Compared to the test method of collecting hydrogen generated by the electrolysis reaction to obtain the actual hydrogen production, calculating the ratio of the actual hydrogen production to the theoretical hydrogen production, and obtaining the electrolysis efficiency of hydrogen production by electrolysis of water, in the test method of obtaining the electrolysis efficiency by measuring the change in the electrolyte according to the embodiment of the present disclosure, because the electrolyte is less affected by temperature and pressure factors, the measurement accuracy of the change in the electrolyte is high, thereby improving the accuracy of the electrolysis efficiency test.

[0038] In the first embodiment, the measuring mechanism includes a weight measuring instrument configured to measure the weight difference of the liquid supply mechanism 1 before and after the electrolytic reaction to obtain the change in the amount of the electrolyte.

[0039] In detail, the liquid supply mechanism 1 is connected to the liquid inlet mechanism 3 through a delivery pipe. The liquid supply mechanism 1 is an independent component and is easy to carry, move or disassemble. The weight measuring instrument can be a platform scale, a hanging scale or a floor scale, etc., which is not limited here. In the initial state, the liquid supply mechanism 1 conveys electrolyte into the liquid inlet mechanism 3, and the liquid inlet mechanism 3 conveys electrolyte into the electrolytic cell 4. After the electrolytic cell 4 is filled with electrolyte, the liquid levels of the liquid inlet mechanism 3 and the electrolytic cell 4 are recorded as preset values. It is understandable that the electrolyte in the electrolytic cell 4 can also be in an unfilled state. At this time, the weight measuring instrument weighs the liquid supply mechanism 1 to obtain a first total weight.

[0040] The power supply module is turned on to carry out the electrolysis reaction, and the liquid inlet mechanism 3 continuously supplies electrolyte to the electrolytic cell 4. At the same time, the electrolyte carried in the gas generated by the electrolysis reaction is also recovered to the liquid inlet mechanism 3 through gas-liquid separation or condensation. The liquid level control component detects the liquid level of the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3, and controls the amount of electrolyte supplied by the liquid supply mechanism 1 so that the liquid level of the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3 is maintained at a preset value. After the preset time of the electrolysis reaction, when the liquid level of the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3 is at the preset value, the weight measuring instrument weighs the liquid supply mechanism 1 to obtain a second total weight. The difference between the first total weight and the second total weight is the change in the electrolyte in the liquid supply mechanism 1, that is, the actual consumption of the electrolyte in the electrolysis reaction.

[0041] According to the embodiments of the present disclosure, the weight measuring instrument can achieve measurement accuracy of "thousandths" or "ten-thousandths" with high measurement accuracy. In addition, because the electrolyte is less affected by temperature and pressure, the measurement accuracy of the electrolyte change is high, thereby improving the accuracy of the electrolysis efficiency test.

[0042] In the second embodiment, the measuring mechanism includes a liquid level meter installed in the liquid supply mechanism 1 and configured to detect the liquid level change of the electrolyte in the liquid supply mechanism 1 to obtain the change amount of the electrolyte.

[0043] According to an embodiment of the present disclosure, before the electrolysis reaction, the liquid supply mechanism 1 supplies electrolyte to the liquid inlet mechanism 3, and the liquid inlet mechanism 3 supplies electrolyte to the electrolytic cell 4. After the electrolytic cell 4 is filled with electrolyte, the liquid levels of the liquid inlet mechanism 3 and the electrolytic cell 4 are recorded as preset values. It is understood that the electrolyte in the electrolytic cell 4 may also be in a partially filled state. In this case, the first liquid level of the electrolyte in the liquid supply mechanism 1 is obtained by a liquid level gauge.

[0044] The power supply module is turned on to carry out the electrolysis reaction, and the liquid inlet mechanism 3 continuously supplies electrolyte to the electrolytic cell 4. At the same time, the electrolyte carried in the gas generated by the electrolysis reaction is also recovered to the liquid inlet mechanism 3 through gas-liquid separation or condensation. The liquid level control component detects the liquid level of the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3, and controls the amount of electrolyte delivered by the liquid supply mechanism 1 so that the liquid level of the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3 is maintained at a preset value. After the electrolysis reaction has proceeded for a preset time, when the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3 is maintained at a preset value, the second liquid level of the electrolyte in the liquid supply mechanism 1 is obtained by the liquid level meter.

[0045] Based on the difference between the first and second liquid levels, the change in the electrolyte within the liquid supply mechanism 1 is calculated, representing the actual consumption of the electrolyte during the electrolysis reaction. In this way, the change in the electrolyte level within the liquid supply mechanism 1 is measured using a liquid level meter to determine the change in the electrolyte level. This method requires a relatively high level of accuracy for the liquid level meter.

[0046] In the third embodiment, the measuring mechanism includes a flow meter configured to measure the flow rate of the electrolyte delivered by the liquid supply mechanism 1 to the liquid inlet mechanism 3 to obtain the change in the electrolyte.

[0047] According to an embodiment of the present disclosure, before the electrolysis reaction, the liquid levels of the liquid inlet mechanism 3 and the electrolytic cell 4 are recorded as preset values, and the flow rate of the electrolyte transported from the liquid supply mechanism 1 to the liquid inlet mechanism 3 is recorded by the flow meter.

[0048] When the power supply module is connected to initiate the electrolysis reaction, the liquid inlet mechanism 3 continuously delivers electrolyte to the electrolytic cell 4. Simultaneously, the electrolyte carried in the gas generated by the electrolysis reaction is recovered to the liquid inlet mechanism 3 through gas-liquid separation or condensation. The liquid level control component detects the electrolyte levels in the electrolytic cell 4 and the liquid inlet mechanism 3 and controls the amount of electrolyte delivered by the liquid supply mechanism 1 to maintain the electrolyte levels in the electrolytic cell 4 and the liquid inlet mechanism 3 at preset values.

[0049] After the electrolysis reaction has run for a preset time, and the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3 remains at a preset value, the flow rate of the electrolyte delivered by the liquid supply mechanism 1 during the preset time is measured using a flow meter. The change in electrolyte volume is then calculated as the actual consumption of electrolyte during the electrolysis reaction. This method of measuring the change in electrolyte volume using a flow meter places high demands on the accuracy of the level gauge.

[0050] It is understandable that the change in the amount of electrolyte can be measured by combining one or more of a weight meter, a level meter, and a flow meter, and the change in the amount of electrolyte can be obtained based on the average of multiple measurement values.

[0051] In the first, second, and third embodiments described above, the amount of electrolyte change within a preset time range before and after the electrolysis reaction is measured using a weight measuring instrument, liquid level meter, or flow meter. However, it is understood that the amount of electrolyte change within the preset time range can also be measured and obtained during the electrolysis reaction. In other words, the preset time can be calculated from the time the power supply module is turned on, or from a certain point during the electrolysis reaction.

[0052] In an exemplary embodiment, the power supply parameter includes at least one of current, voltage, and power.

[0053] According to embodiments of the present disclosure, the theoretical amount of hydrogen produced by the electrolysis reaction can be calculated based on the amount of electricity produced within a preset time range. Based on the theoretical amount of hydrogen produced, the theoretical amount of electrolyte consumption can be calculated. The amount of electricity can also be calculated from the current and voltage to obtain the theoretical amount of electrolyte consumption.

[0054] In an exemplary embodiment, Figure 1 As shown, the electrolysis efficiency test system also includes a separation and recovery mechanism 5, which is connected to the exhaust end of the electrolytic cell 4 of the water electrolysis device 2 and the liquid inlet mechanism 3, and is constructed to receive the gas precipitated by the electrolysis reaction in the electrolytic cell 4, and separate part of the electrolyte carried in the gas and return it to the liquid inlet mechanism 3.

[0055] It should be noted that the separation and recovery mechanism 5 is capable of separating and collecting the liquid electrolyte carried in the gas released by the electrolytic reaction, thereby improving the purity of the gas. Although the separation and recovery mechanism 5 cannot completely separate the liquid electrolyte carried in the gas, making the gas purity reach 100%, after the gas passes through the separation and recovery mechanism 5 and the electrolyte is separated, the gas purity can reach 99.99%, meeting the hydrogen purity requirements, and also separating the electrolyte carried in the gas to the greatest extent possible, meeting the required requirements.

[0056] According to the embodiments of the present disclosure, since part of the electrolyte carried in the gas produced by the electrolysis reaction is electrolyte that does not participate in the electrolysis reaction, when calculating the actual consumption of the electrolyte, it is necessary to calculate the impact of the part of the electrolyte carried in the gas produced by the electrolysis reaction on the actual consumption of the electrolyte. When the separation and recovery mechanism 5 separates the part of the electrolyte carried in the gas and returns it to the liquid inlet mechanism 3, the change in the electrolyte in the liquid inlet mechanism 3 is the actual consumption of the electrolyte in the electrolysis reaction, which improves the convenience of the test.

[0057] In an exemplary embodiment, Figure 1 As shown, the separation and recovery mechanism 5 is constructed as a multi-stage gas-liquid separation to remove part of the electrolyte carried in the gas step by step.

[0058] Specifically, if Figure 1 As shown, the separation and recovery mechanism 5 includes a first separation component 51 and a second separation component 52. The first separation component 51 and the second separation component 52 are respectively connected to the exhaust end of the anode chamber and the exhaust end of the cathode chamber of the electrolytic cell 4. The first separation component 51 and the second separation component 52 each include two gas-liquid separators 53, which are connected in sequence and arranged downstream of the electrolytic cell 4 to gradually remove the electrolyte carried in the gas. The two gas-liquid separators 53 include a first gas-liquid separator 531 and a second gas-liquid separator 532, the first gas-liquid separator 531 is arranged downstream of the electrolytic cell 4, and the second gas-liquid separator 532 is arranged downstream of the first gas-liquid separator 531. It can be understood that the number of gas-liquid separators 53 can be two, three, four, five, etc., which is determined according to actual needs.

[0059] Furthermore, if Figure 1 As shown, the liquid outlet of the second gas-liquid separator 532 ( Figure 1 The bottom end of the second gas-liquid separator 532 is connected to the first gas-liquid separator 531 to return the electrolyte separated from the gas by the second gas-liquid separator 532 to the first gas-liquid separator 531. Figure 1The bottom end of the first gas-liquid separator 531 in the middle) is connected to the liquid inlet mechanism 3, so that the electrolyte flowing from the second gas-liquid separator 532 into the first gas-liquid separator 531 and the electrolyte separated from the gas by the first gas-liquid separator 531 flow into the liquid inlet mechanism 3 for recycling.

[0060] It is understandable that the liquid outlet of the first gas-liquid separator 531 and the liquid outlet of the second gas-liquid separator 532 can also be connected to the liquid inlet mechanism 3, so that the electrolyte separated from the gas can flow back to the liquid inlet mechanism 3 for recycling.

[0061] According to an embodiment of the present disclosure, the gas generated by the electrolysis reaction in the electrolytic cell 4 enters the first gas-liquid separator 531, where it undergoes a first-stage gas-liquid separation. The liquid settles at the bottom of the first gas-liquid separator 531 and flows back to the liquid inlet mechanism 3 for recycling. The gas is located at the top of the first gas-liquid separator 531 and discharged. Since the gas discharged from the first gas-liquid separator 531 may still contain some electrolyte, the gas then enters the second gas-liquid separator 532 for further second-stage gas-liquid separation. The liquid is located at the bottom of the second gas-liquid separator 532 and flows back to the liquid inlet mechanism 3 for recycling. The gas is located at the top of the second gas-liquid separator 532 and discharged for collection. Through multi-stage gas-liquid separation, the electrolyte carried in the gas is gradually removed, improving the purity of the gas. The gas purity can reach 99.99%, allowing the electrolyte that does not participate in the electrolysis reaction to be recovered, thereby improving the accuracy of measuring the actual consumption of the electrolyte and improving the accuracy of the electrolysis efficiency test.

[0062] In an exemplary embodiment, Figure 1 As shown, the separation and recovery mechanism 5 further includes a condenser 54, which is configured to condense part of the electrolyte in the gaseous state into liquid to separate it from the gas.

[0063] It should be noted that, since part of the electrolyte carried in the gas is in gaseous state, the gaseous electrolyte may not be easily separated by the gas-liquid separator 53 , thus affecting the electrolyte separation effect.

[0064] According to an embodiment of the present disclosure, a condenser 54 is provided between the adjacent first gas-liquid separator 531 and the second gas-liquid separator 532 to cool the gaseous electrolyte from the top of the first gas-liquid separator 531 into a liquid state, so that the liquid electrolyte can be more effectively separated by the second gas-liquid separator 532, thereby further improving the purity of the gas. The purity of the gas can reach more than 99.99%, so that the electrolyte that does not participate in the electrolysis reaction can be fully recovered, thereby improving the accuracy of measuring the actual consumption of the electrolyte and improving the accuracy of the electrolysis efficiency test.

[0065] Figure 2 The flowchart of the testing method of the electrolysis efficiency testing system according to the embodiment of the present disclosure is schematically shown.

[0066] The embodiment of the present disclosure also provides a test method for an electrolysis efficiency test system, such as Figure 2 As shown, the testing method includes operations S110 - S130 .

[0067] In operation S110 , a theoretical consumption of the electrolyte in the electrolysis reaction is obtained based on power supply parameters within a preset time range in the electrolysis reaction.

[0068] In operation S120 , actual consumption of the electrolyte in the electrolysis reaction is obtained based on a change in the amount of the electrolyte before and after the electrolysis reaction.

[0069] In operation S130 , the electrolysis efficiency of the electrolysis reaction is obtained based on the actual consumption and the theoretical consumption.

[0070] In detail, the main principle of hydrogen production by water electrolysis is that water molecules are dissociated into oxygen and hydrogen under the action of direct current, and are respectively precipitated from the anode and cathode of the electrolytic cell 4, which can be specifically expressed as follows:

[0071] 2 (l)→2 (g)+ (g);

[0072] Among them, a reduction reaction occurs near the cathode, namely:

[0073] 2 (l)+2 → (g)+2 ;

[0074] An oxidation reaction occurs near the anode, namely:

[0075] 4 → (g)+2 (l)+4 ;

[0076] It should be noted that in operation S110, the theoretical consumption of electrolyte during the electrolysis reaction is obtained based on the power supply parameters of the direct current applied within a preset time range. The power supply parameters may include current, voltage, and / or power. Before the electrolysis reaction, sufficient electrolyte is filled to a level greater than the theoretical consumption of electrolyte, so that no additional electrolyte is added during the electrolysis reaction.

[0077] In operation S120, direct current is connected within a preset time range to perform an electrolysis reaction to release hydrogen and oxygen. During the electrolysis reaction, no electrolyte is added or discharged to ensure that the change in electrolyte before and after the electrolysis reaction is the actual consumption of electrolyte.

[0078] According to the embodiments of the present disclosure, the electrolysis efficiency of the electrolysis reaction is determined based on the actual and theoretical electrolyte consumption. Because the measurement of electrolyte variation is less affected by temperature and pressure, measuring the actual electrolyte consumption provides high measurement accuracy, thereby improving the accuracy of the electrolysis efficiency test.

[0079] Figure 3 A flow chart for obtaining the theoretical consumption of electrolyte in an electrolysis reaction according to an embodiment of the present disclosure is schematically shown.

[0080] In an exemplary embodiment, Figure 3 As shown, obtaining the theoretical consumption of the electrolyte in the electrolysis reaction includes operations S210 to S230.

[0081] In operation S210, the amount of electricity in the electrolysis reaction is obtained based on the power supply parameters within a preset time range in the electrolysis reaction. The amount of electricity in the electrolysis reaction can be obtained based on current or voltage.

[0082] Specifically, the electric charge is obtained through the current, where the expression of the electric charge is:

[0083] (1);

[0084] in, is the amount of electricity; is the current; is the preset time.

[0085] According to an embodiment of the present disclosure, the product of the preset time and the current is the amount of electricity consumed by the electrolysis reaction.

[0086] In operation S220 , a theoretical amount of hydrogen generated by the electrolysis reaction is obtained based on the amount of electricity generated by the electrolysis reaction.

[0087] Specifically, the expression for the theoretical hydrogen production is:

[0088] (2);

[0089] in, is the theoretical amount of hydrogen produced; is the amount of electricity; is the number of electrolytic cells; 2390 is the theoretical amount of electricity required to produce 1 cubic meter of hydrogen under standard conditions.

[0090] In operation S230 , a theoretical consumption of the electrolyte is obtained based on the theoretical hydrogen generation amount.

[0091] Specifically, the expression for the mass of the electrolyte is:

[0092] m( )= (3);

[0093] Where m is the mass of the electrolyte; is the theoretical amount of hydrogen produced; is the relative molecular weight of the electrolyte; is the volume occupied by 1 mole of ideal hydrogen under standard conditions. It should be noted that the electrolyte is water.

[0094] Figure 4 A flow chart schematically illustrates the change in the amount of electrolyte before and after the electrolysis reaction according to an embodiment of the present disclosure.

[0095] In an exemplary embodiment, Figure 4 As shown, the change in the amount of electrolyte before and after the electrolysis reaction includes operations S310 to S330.

[0096] In operation S310 , a first total weight of the liquid supply mechanism 1 after being filled with the electrolyte before the electrolysis reaction is performed is obtained.

[0097] Operation S320 , after obtaining the electrolysis reaction, when the electrolyte carried in the gas generated by the electrolysis reaction is recovered in the electrolytic cell 4 and the liquid inlet mechanism 3 and the electrolyte is maintained at a preset value, the second total weight of the liquid supply mechanism 1 is measured.

[0098] In operation S330 , a change in the electrolyte before and after the electrolysis reaction is obtained based on the first total weight and the second total weight.

[0099] In operation S310, before the electrolysis reaction begins, the liquid supply mechanism 1 of the water electrolysis device 2 is filled with sufficient electrolyte. The amount of electrolyte filled is greater than the theoretical consumption of the electrolyte so that no more electrolyte is added during the electrolysis reaction. In addition, after the electrolyte is filled, the electrolyte in the water electrolysis device 2 is no longer discharged.

[0100] In operation S320, the electrolyte carried in the oxygen and hydrogen generated by the electrolysis reaction does not participate in the electrolysis reaction and is simply discharged with the generated gases. Therefore, it is necessary to recover the electrolyte carried in the gases. The recovered electrolyte carried in the gases is transferred to the liquid inlet mechanism 3. While the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3 is maintained at a preset value, the second total weight of the liquid supply mechanism 1 is measured.

[0101] In operation S330, the first total weight and the second total weight can be measured by weighing. The difference between the first total weight and the second total weight is the change in the electrolyte in the liquid supply mechanism 1, that is, the actual consumption of the electrolyte before and after the electrolysis reaction. This testing method can be applied to the first embodiment described above.

[0102] In an exemplary embodiment, the electrolysis efficiency includes a ratio of actual consumption to theoretical consumption.

[0103] According to the embodiments of the present disclosure, the electrolysis efficiency of the electrolysis reaction is obtained by calculating the ratio of the actual consumption of the electrolyte to the theoretical consumption. In the test method of obtaining the electrolysis efficiency by measuring the change in the electrolyte, the electrolyte is less affected by temperature and pressure factors, so the measurement accuracy of the electrolyte change is high, thereby improving the accuracy of the electrolysis efficiency test.

[0104] Figure 5 A flow chart schematically illustrates the change in the amount of electrolyte before and after the electrolysis reaction according to an embodiment of the present disclosure.

[0105] In an exemplary embodiment, Figure 5 As shown, the change in the amount of electrolyte before and after the electrolysis reaction includes operations S410 to S430.

[0106] In operation S410 , a first liquid level of the liquid supply mechanism 1 after being filled with electrolyte before the electrolysis reaction is acquired.

[0107] In operation S420, after obtaining the electrolysis reaction, the second liquid level of the electrolyte in the liquid supply mechanism 1 is maintained at a preset value after the electrolyte carried in the gas generated by the electrolysis reaction is recovered in the electrolytic cell 4 and the liquid inlet mechanism 3.

[0108] In operation S430, a change in the electrolyte before and after the electrolysis reaction is obtained based on the first liquid level and the second liquid level.

[0109] In operation S410 , before the electrolysis reaction, the liquid supply mechanism 1 is filled with sufficient required electrolyte, the filling amount of the electrolyte being greater than the theoretical consumption of the electrolyte, and a first liquid level after the electrolyte is filled in the liquid supply mechanism 1 is measured.

[0110] In operation S420, the electrolyte carried in the oxygen and hydrogen generated by the electrolysis reaction is the electrolyte that does not participate in the electrolysis reaction. Therefore, it is necessary to recover the electrolyte carried in the gas into the liquid inlet mechanism 3. When the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3 is maintained at a preset value, the second liquid level of the electrolyte in the liquid supply mechanism 1 is measured.

[0111] In operation S430, the first and second liquid levels can be measured using a liquid level meter. The difference between the first and second liquid levels is the change in the electrolyte within the liquid supply mechanism 1, i.e., the actual consumption of the electrolyte before and after the electrolysis reaction. This testing method can be applied to the second embodiment described above.

[0112] It should be noted that, based on the third embodiment described above, the change in the amount of electrolyte before and after the electrolysis reaction includes: before the electrolysis reaction, recording the liquid levels of the liquid inlet mechanism 3 and the electrolytic cell 4 as preset values; during and after the electrolysis reaction, when the electrolyte in the electrolytic cell 4 and the liquid inlet mechanism 3 is maintained at the preset values, obtaining the flow rate of the electrolyte delivered by the liquid supply mechanism 1 during the preset electrolysis reaction time to obtain the change in the amount of electrolyte, which is the actual consumption of the electrolyte in the electrolysis reaction. In this way, the method of obtaining the change in the amount of electrolyte using a flow meter requires a relatively high accuracy of the level meter.

[0113] According to the electrolysis efficiency testing system and testing method provided by the present disclosure, within a preset time range, the acquisition module obtains the power supply parameters, and the processing module can obtain the theoretical amount of electricity required for the electrolysis reaction based on the power supply parameters, and then obtain the theoretical consumption of the electrolyte. The liquid supply mechanism 1 provides electrolyte to the liquid inlet mechanism 3, so that the liquid level of the electrolyte is maintained at a preset value after the electrolytic cell 4 of the water electrolysis device 2 and the liquid inlet mechanism 3 recover part of the electrolyte carried in the gas generated by the electrolysis reaction. Among them, the part of the electrolyte carried in the gas is the electrolyte that does not participate in the electrolysis reaction, so the change in the electrolyte in the liquid supply mechanism 1 represents the actual consumption of the electrolyte in the electrolysis reaction. The processing module obtains the electrolysis efficiency of the electrolysis reaction based on the ratio of the theoretical consumption of the electrolyte to the actual consumption. By measuring the change in the electrolyte, since the electrolyte is less affected by temperature and pressure, the measurement accuracy of the change in the electrolyte is high, thereby improving the accuracy of the electrolysis efficiency test.

[0114] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. An electrolysis efficiency testing system, suitable for testing the electrolysis efficiency of an electrolysis reaction of a water electrolysis device (2), characterized in that: include: a collection module configured to collect power supply parameters of the power supply module of the water electrolysis device (2); A liquid supply mechanism (1) is configured to supply electrolyte to a liquid inlet mechanism (3) of the water electrolysis device (2); a liquid level control component configured to detect the liquid level of the electrolyte after recovering a portion of the electrolyte carried in the gas generated by the electrolysis reaction in the electrolytic cell (4) of the water electrolysis device (2) and the liquid inlet mechanism (3), and to control the liquid supply mechanism (1) so that the liquid level in the liquid inlet mechanism (3) is maintained at a preset value; a measuring mechanism configured to measure a change in the amount of the electrolyte in the liquid supply mechanism (1); as well as The processing module is configured to obtain the electrolysis efficiency of the electrolysis reaction based on the power supply parameters and the change in the electrolyte within a preset time range.

2. The electrolysis efficiency testing system according to claim 1, characterized in that: The measuring mechanism includes a weight measuring instrument configured to measure the weight difference of the liquid supply mechanism (1) before and after the electrolysis reaction to obtain the change in the amount of the electrolyte.

3. The electrolysis efficiency testing system according to claim 1, characterized in that: The measuring mechanism comprises a liquid level meter installed in the liquid supply mechanism (1) and configured to detect the change in the liquid level of the electrolyte in the liquid supply mechanism (1) to obtain the change in the amount of the electrolyte.

4. The electrolysis efficiency testing system according to claim 1, characterized in that: The measuring mechanism comprises a flow meter configured to measure the flow rate of the electrolyte delivered by the liquid supply mechanism (1) to the liquid inlet mechanism (3) to obtain a change in the amount of the electrolyte.

5. The electrolysis efficiency testing system according to claim 1, characterized in that: The power supply parameter includes at least one of current, voltage and power.

6. The electrolysis efficiency testing system according to any one of claims 1 to 5, characterized in that: The device further comprises a separation and recovery mechanism (5), which is in communication with the exhaust end of the electrolytic cell (4) of the water electrolysis device (2) and the liquid inlet mechanism (3), and is configured to receive gas precipitated by the electrolytic reaction in the electrolytic cell (4), separate part of the electrolyte carried in the gas, and reflux the gas to the liquid inlet mechanism (3).

7. The electrolysis efficiency testing system according to claim 6, characterized in that: The separation and recovery mechanism (5) is constructed as a multi-stage gas-liquid separation to remove part of the electrolyte carried in the gas step by step.

8. The electrolysis efficiency testing system according to claim 6, characterized in that: The separation and recovery mechanism (5) further includes a condenser (54) configured to condense a gaseous portion of the electrolyte in the gas into a liquid to separate it from the gas.

9. A method for testing the electrolysis efficiency test system according to any one of claims 1 to 8, characterized in that: include: Based on the power supply parameters within a preset time range of the electrolysis reaction, the theoretical consumption of the electrolyte in the electrolysis reaction is obtained; Obtaining an actual consumption of the electrolyte in the electrolysis reaction based on a change in the amount of the electrolyte before and after the electrolysis reaction; as well as Based on the actual consumption and the theoretical consumption, the electrolysis efficiency of the electrolysis reaction is obtained.

10. The testing method according to claim 9, characterized in that: The theoretical consumption of the electrolyte in the electrolysis reaction includes: Obtaining the amount of electricity for the electrolysis reaction based on power supply parameters within a preset time range in the electrolysis reaction; Obtaining a theoretical amount of hydrogen produced by the electrolysis reaction based on the amount of electricity produced by the electrolysis reaction; and Based on the theoretical hydrogen production, the theoretical consumption of the electrolyte is obtained.

11. The testing method according to claim 9, characterized in that: Obtaining the change in the electrolyte before and after the electrolysis reaction includes: Obtaining a first total weight of the liquid supply mechanism (1) after being filled with the electrolyte before the electrolysis reaction; After obtaining the electrolysis reaction, after recovering a portion of the electrolyte carried in the gas generated by the electrolysis reaction in the electrolytic cell (4) and the liquid inlet mechanism (3), the second total weight of the liquid supply mechanism (1) is measured when the electrolyte is maintained at a preset value; and Based on the first total weight and the second total weight, a change in the electrolyte before and after the electrolysis reaction is obtained.

12. The testing method according to claim 9, wherein: Obtaining the change in the electrolyte before and after the electrolysis reaction includes: Obtaining a first liquid level after the electrolyte is filled in the liquid supply mechanism (1) before the electrolysis reaction; After obtaining the electrolysis reaction, when the electrolyte is maintained at a preset value after recovering part of the electrolyte carried in the gas generated by the electrolysis reaction in the electrolytic cell (4) and the liquid inlet mechanism (3), the second liquid level of the electrolyte in the liquid supply mechanism (1); and Based on the first liquid level and the second liquid level, a change in the electrolyte before and after the electrolysis reaction is obtained.

13. The testing method according to claim 9, characterized in that: The electrolysis efficiency includes the ratio of the actual consumption to the theoretical consumption.

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