Electrolytic hydrogen production system

Abstract

The utility model discloses an electrolytic hydrogen production system, and belongs to the technical field of electrolytic hydrogen production. The electrolytic hydrogen production system comprises an electrolytic bath, N anode chambers and N cathode chambers are defined by the electrolytic bath, N is larger than or equal to 1 and is a positive integer, and the electrolytic bath is provided with an oxygen side gas-liquid outlet communicated with the multiple anode chambers and a hydrogen side gas-liquid outlet used for being communicated with the multiple cathode chambers; an inlet of the hydrogen gas-liquid separator is connected with the hydrogen side gas-liquid outlet; the oxygen sensor is used for detecting the oxygen concentration at the outlet of the hydrogen gas-liquid separator; the first conveying pipe is communicated with the N cathode chambers and is used for injecting non-oxygen first gas into the N cathode chambers; an inlet of the oxygen gas-liquid separator is connected with the oxygen side gas-liquid outlet; the hydrogen sensor is used for detecting the hydrogen concentration at the outlet of the oxygen gas-liquid separator; and the second conveying pipe is communicated with the N anode chambers and is used for injecting non-hydrogen second gas into the N anode chambers. By using the structure, the oxygen content in hydrogen in the cathode chamber and the hydrogen content in oxygen in the anode chamber are reduced, and the safe operation of the system under low power is maintained.

Description

Technical Field

[0001] The present application belongs to the technical field of electrolytic hydrogen production, and in particular relates to an electrolytic hydrogen production system. Background Art

[0002] Current electrolytic hydrogen production systems widely have the problem of power limit. The cathode and anode are separated by a diaphragm to isolate hydrogen and oxygen, but the diaphragm does not completely isolate hydrogen and oxygen. Hydrogen and oxygen have a certain permeability. Especially when the power of the electrolyzer is too low, the total amount of hydrogen and oxygen produced is small, but the content of hydrogen and oxygen diffused through the diaphragm does not change much compared to full power, resulting in a decrease in gas purity. Once the oxygen content in hydrogen or the hydrogen content in oxygen exceeds the warning shutdown index, the electrolytic hydrogen production system will be forced to shut down to prevent explosion accidents in the cathode chamber and the anode chamber, seriously affecting energy utilization efficiency. Even if the system is shut down, this safety risk cannot be completely avoided. The mixed gas with unqualified oxygen concentration in the cathode chamber and the mixed gas with unqualified hydrogen concentration in the anode chamber are difficult to properly handle. Once an error occurs during the emptying process, it will still cause an explosion accident. Utility Model Content

[0003] This application aims to solve at least one of the technical problems existing in the prior art.

[0004] In a first aspect, the present application provides an electrolysis hydrogen production system, comprising:

[0005] An electrolytic cell, wherein the electrolytic cell defines N anode chambers and N cathode chambers, where N is a positive integer and is greater than or equal to 1, and has an oxygen-side gas-liquid outlet for communicating with the anode chambers and a hydrogen-side gas-liquid outlet for communicating with the cathode chambers;

[0006] A hydrogen gas-liquid separator, wherein the inlet of the hydrogen gas-liquid separator is connected to the hydrogen side gas-liquid outlet;

[0007] an oxygen sensor, the oxygen sensor being used to detect the oxygen concentration at the outlet of the hydrogen gas-liquid separator;

[0008] a first delivery pipe, the first delivery pipe being in communication with the N cathode chambers and being configured to inject a first gas into the N cathode chambers, the first gas being non-oxygen;

[0009] an oxygen gas-liquid separator, wherein the inlet of the oxygen gas-liquid separator is connected to the oxygen-side gas-liquid outlet;

[0010] a hydrogen sensor, the hydrogen sensor being used to detect the hydrogen concentration at the outlet of the oxygen gas-liquid separator;

[0011] A second delivery pipe is connected to the N anode chambers and is used to inject a second gas into the N anode chambers, where the second gas is non-hydrogen.

[0012] According to the electrolytic hydrogen production system of the present application, by setting the above-mentioned oxygen sensor, first delivery pipe, hydrogen sensor and second delivery pipe, it is achieved that when the electrolytic hydrogen production system is operated at low power and the hydrogen purity is insufficient, the first gas and the second gas are respectively added to the cathode chamber and the cathode chamber to reduce the oxygen content in hydrogen and the hydrogen content in oxygen, and the sudden increase of the oxygen concentration in the cathode chamber and the hydrogen concentration in the anode chamber is timely suppressed from the source, shortening the duration of the abnormal oxygen concentration in each cathode chamber and the abnormal hydrogen concentration in each anode chamber, reducing the probability of explosion of the electrolytic cell as much as possible, and effectively maintaining the safe operation of the electrolytic hydrogen production system at low power. In addition, the electrolytic hydrogen production system does not need to be forced to shut down, increasing the continuity of electrolytic hydrogen production while reducing the waste of electricity and hydrogen, thereby improving energy utilization efficiency.

[0013] According to one embodiment of the present application, the electrolysis hydrogen production system further includes:

[0014] a first valve, the first valve being arranged on the first delivery pipe;

[0015] A controller is electrically connected to the electrolytic cell, the oxygen sensor, and the first valve, and is configured to control the first valve based on an input power of the electrolytic cell and / or a detection value of the oxygen sensor.

[0016] According to one embodiment of the present application, the controller includes:

[0017] a first comparator electrically connected to the electrolytic cell and the oxygen sensor, configured to compare the input power of the electrolytic cell with a first target threshold value, and to compare the detection value of the oxygen sensor with a second target threshold value;

[0018] A first processor is electrically connected to the first comparator and is configured to output a control instruction based on a comparison result, wherein the control instruction is used to control the first valve.

[0019] According to one embodiment of the present application, the electrolysis hydrogen production system further includes:

[0020] A second valve is arranged in the second delivery pipe, and the controller is electrically connected to the hydrogen sensor and the second valve, and is used to control the second valve based on the input power of the electrolyzer and / or the detection value of the hydrogen sensor.

[0021] According to the electrolytic hydrogen production system of the present application, through the arrangement of the above-mentioned hydrogen sensor, second delivery pipe, second gas and second valve, it is achieved that when the electrolytic hydrogen production system is operating at low power and the oxygen purity is insufficient, the second gas is added to multiple anode chambers to reduce the hydrogen content in the oxygen, and the second gas is directly added to each anode chamber in a targeted manner, so as to timely suppress the sudden increase in hydrogen concentration from the source, shorten the duration of the abnormal hydrogen concentration in each anode chamber, and combined with the above-mentioned design of adding the first gas to multiple cathode chambers, the probability of explosion of the electrolytic cell is minimized, and the safe operation of the electrolytic hydrogen production system at low power is maintained. In addition, the electrolytic hydrogen production system does not need to be forced to shut down, which increases the continuity of electrolytic hydrogen production while reducing the waste of electricity and hydrogen, thereby further improving energy utilization efficiency.

[0022] According to one embodiment of the present application, the controller further includes:

[0023] a second comparator electrically connected to the electrolyzer and the hydrogen sensor, configured to compare the input power of the electrolyzer with a first target threshold value, and to compare the detection value of the hydrogen sensor with a third target threshold value;

[0024] A second processor is electrically connected to the second comparator and is configured to output a control instruction based on a comparison result, wherein the control instruction is used to control the second valve.

[0025] According to one embodiment of the present application, the first gas and the second gas are different, and the electrolysis hydrogen production system further includes:

[0026] a first gas source, the first gas source being connected to the N cathode chambers through a first delivery pipe;

[0027] A second gas source is connected to the N anode chambers through a second delivery pipe.

[0028] According to one embodiment of the present application, the first gas and the second gas are the same, and the electrolysis hydrogen production system further includes:

[0029] A third gas source is connected to the N cathode chambers through a first delivery pipe, and is connected to the plurality of anode chambers through a second delivery pipe.

[0030] According to one embodiment of the present application, the first gas includes at least one of hydrogen, nitrogen, carbon monoxide, carbon dioxide and an inert gas, and the electrolysis hydrogen production system further includes:

[0031] A purification device and a hydrogen storage device, the inlet of the purification device is connected to the outlet of the hydrogen gas-liquid separator, the outlet of the purification device is connected to the inlet of the hydrogen storage device, and the oxygen sensor is located between the inlet of the purification device and the outlet of the hydrogen gas-liquid separator.

[0032] According to one embodiment of the present application, the first gas includes nitrogen, and the outlet of the hydrogen gas-liquid separator is used to connect to an ammonia production system; or, the first gas includes carbon monoxide and carbon dioxide, and the outlet of the hydrogen gas-liquid separator is used to connect to a methanol production system.

[0033] According to one embodiment of the present application, the second gas includes at least one of oxygen, nitrogen, and an inert gas.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 This is one of the structural diagrams of the electrolysis hydrogen production system provided in the embodiment of the present application;

[0037] Figure 2 This is the second structural diagram of the electrolysis hydrogen production system provided in the embodiment of the present application;

[0038] Figure 3 Schematic diagram of the structure of the electrolysis hydrogen production system and the ammonia production system provided in the embodiment of the present application;

[0039] Figure 4 It is a structural schematic diagram of the electrolysis hydrogen production system and the methanol production system provided in the embodiments of the present application.

[0040] Reference numerals:

[0041] Electrolysis hydrogen production system 100, first gas source 101, second gas source 102, third gas source 103, first delivery pipe 104, second delivery pipe 105;

[0042] Electrolyzer 110, hydrogen gas-liquid separator 120, oxygen sensor 130, first valve 140, purification device 150, oxygen gas-liquid separator 160, hydrogen sensor 170, second valve 180, hydrogen storage device 190;

[0043] Ammonia production system 200, methanol production system 300. DETAILED DESCRIPTION

[0044] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0045] The present application discloses a hydrogen production system 100 by electrolysis.

[0046] Reference below Figure 1-Figure 4 A hydrogen production system 100 according to an embodiment of the present application is described.

[0047] In some embodiments, as Figure 1-Figure 4 As shown, the electrolysis hydrogen production system 100 includes: an electrolytic cell 110, a hydrogen gas-liquid separator 120, an oxygen sensor 130, a first delivery pipe 104, an oxygen gas-liquid separator 160, a hydrogen sensor 170 and a second delivery pipe 105.

[0048] The electrolytic cell 110 defines N anode chambers and N cathode chambers, where N ≥ 1 and is a positive integer, and the electrolytic cell 110 has an oxygen-side gas-liquid outlet for communicating with the anode chamber and a hydrogen-side gas-liquid outlet for communicating with the cathode chamber; the inlet of the hydrogen gas-liquid separator 120 is connected to the hydrogen-side gas-liquid outlet; the oxygen sensor 130 is used to detect the oxygen concentration at the outlet of the hydrogen gas-liquid separator 120; the first delivery pipe 104 is connected to the N cathode chambers, and the first delivery pipe 104 is used to inject a first gas, which is not oxygen, into the N cathode chambers; the inlet of the oxygen gas-liquid separator 160 can be connected to the oxygen-side gas-liquid outlet; the hydrogen sensor 170 can be used to detect the hydrogen concentration at the outlet of the oxygen gas-liquid separator 160; the second delivery pipe 105 can be connected to the N anode chambers, and the second delivery pipe 105 can be used to inject a second gas, which is not hydrogen, into the N anode chambers.

[0049] For example, in some embodiments, electrolysis cell 110 defines 20 anode compartments and 20 cathode compartments.

[0050] For example, in other embodiments, the electrolytic cell 110 defines an anode chamber and a cathode chamber.

[0051] It is understandable that if Figure 1-Figure 4As shown, an electrolytic reaction occurs in N anode chambers to produce oxygen, and an electrolytic reaction occurs in N cathode chambers to produce hydrogen. The hydrogen, mixed with a small amount of alkaline liquid and a small amount of oxygen, enters the hydrogen gas-liquid separator 120. The hydrogen gas-liquid separator 120 absorbs the alkaline liquid in the mixed gas and releases crude hydrogen to be purified from the outlet of the hydrogen gas-liquid separator 120. The oxygen sensor 130 can detect the oxygen content in the crude hydrogen to be purified, and the alkaline liquid remaining in the hydrogen gas-liquid separator 120 can be circulated back to the electrolytic cell 110. Oxygen, mixed with a small amount of alkaline liquid and a small amount of hydrogen, enters the oxygen gas-liquid separator 160. The oxygen gas-liquid separator 160 absorbs the alkaline liquid in the mixed gas and releases crude oxygen mixed with a small amount of hydrogen from the outlet of the oxygen gas-liquid separator 160. The electrolytic hydrogen production system 100 can exhaust the crude oxygen mixed with a small amount of hydrogen, and the alkaline liquid remaining in the oxygen gas-liquid separator 160 can be circulated back to the electrolytic cell 110.

[0052] In actual implementation, Figure 1-Figure 4 As shown, when the electrolyzer 110 operates at low power, the total amount of hydrogen produced by the N cathode chambers decreases, and the proportion of oxygen in the total gas increases. Once the detection value of the oxygen sensor 130 exceeds the set range, the first gas can enter the N cathode chambers through the first delivery pipe 104. Specifically, the hydrogen side and the oxygen side of the electrolyzer 110 can circulate liquid independently. In other words, inside the electrolyzer 110, the hydrogen side flow channel and the oxygen side flow channel can be set separately, and a hydrogen side delivery pipeline and an oxygen side alkali liquid delivery pipeline are respectively set outside the electrolyzer. The inlet of the hydrogen side delivery pipeline is connected to the hydrogen gas-liquid separator 120 and the first delivery pipe 104, and the outlet of the hydrogen side delivery pipeline is connected to the hydrogen side flow channel. The inlet of the oxygen side alkali liquid delivery pipeline is connected to the oxygen gas-liquid separator 160 and the second delivery pipe 105, and the outlet of the oxygen side alkali liquid delivery pipeline is connected to the oxygen side flow channel. The alkaline liquid leaving the hydrogen gas-liquid separator 120 can be mixed with the first gas and circulated to the N cathode chambers through the above-mentioned hydrogen side delivery pipeline and the hydrogen side flow channel. In the process of continuously replenishing the first gas in the N cathode chambers, the total amount of the mixed gas in each cathode chamber continues to increase, and the oxygen concentration in each cathode chamber also gradually decreases accordingly until the detection value of the oxygen sensor 130 no longer fluctuates and stabilizes within the set range, and the oxygen concentration in each cathode chamber reaches a equilibrium state; the alkaline liquid leaving the oxygen gas-liquid separator 160 can be mixed with the second gas and circulated to the N anode chambers through the above-mentioned oxygen side delivery pipeline and the oxygen side flow channel. In the process of continuously replenishing the second gas in the N anode chambers, the total amount of the mixed gas in each anode chamber continues to increase, and the hydrogen concentration in each anode chamber also gradually decreases accordingly until the detection value of the hydrogen sensor 170 no longer fluctuates and stabilizes within the set range, and the hydrogen concentration in each anode chamber reaches a equilibrium state.

[0053] The electrolytic hydrogen production system 100 provided in the embodiment of the present application, through the arrangement of the above-mentioned oxygen sensor 130, first delivery pipe 104, hydrogen sensor 170 and second delivery pipe 105, realizes that when the electrolytic hydrogen production system 100 is operating at low power and the hydrogen purity is insufficient, the first gas and the second gas are respectively supplemented to the cathode chamber and the cathode chamber to reduce the oxygen content in hydrogen and the hydrogen content in oxygen, thereby promptly suppressing the sudden increase of the oxygen concentration in the cathode chamber and the hydrogen concentration in the anode chamber from the root, shortening the duration of the abnormal oxygen concentration in each cathode chamber and the abnormal hydrogen concentration in each anode chamber, minimizing the probability of explosion of the electrolytic cell 110, and effectively maintaining the safe operation of the electrolytic hydrogen production system 100 at low power. In addition, the electrolytic hydrogen production system 100 does not need to be forced to shut down, increasing the continuity of electrolytic hydrogen production while reducing the waste of electricity and hydrogen, thereby improving energy utilization efficiency.

[0054] In some embodiments, as Figure 1-Figure 4 As shown, the electrolysis hydrogen production system 100 may further include: a first valve 140 and a controller.

[0055] The first valve 140 can be arranged in the first delivery pipe 104; the controller can be electrically connected to the electrolyzer 110, the oxygen sensor 130 and the first valve 140, and the controller can be used to control the first valve 140 based on the input power of the electrolyzer 110 and / or the detection value of the oxygen sensor 130.

[0056] In actual implementation, under normal circumstances, the first valve 140 is closed, that is, the first delivery pipe 104 is in an unconnected state, and the controller can obtain the input power of the electrolyzer 110 and the detection value of the oxygen sensor 130. When the input power of the electrolyzer 110 and the detection value of the oxygen sensor 130 do not meet the corresponding set range, the controller can control the first valve 140 to open, that is, the first delivery pipe 104 is switched to a conductive state, and the first gas can enter the N cathode chambers through the first delivery pipe 104.

[0057] It should be noted that if more precise control of the delivery rate of the first gas is required, the controller may control the delivery rate of the first gas per unit time by controlling the opening of the first valve 140 .

[0058] The electrolysis hydrogen production system 100 provided in the embodiment of the present application, through the configuration of the above-mentioned first valve 140 and the controller, can change the conduction state of the first delivery pipe 104 by controlling the opening and closing of the first valve 140 based on the acquired input power of the electrolyzer 110 and the detection value of the oxygen sensor 130. When an abnormal oxygen content in hydrogen is detected, the controller can respond immediately and quickly replenish the first gas to each cathode chamber to reduce the oxygen content in the hydrogen, thereby solving the safety problem of the electrolysis hydrogen production system 100 when it is operated at low power.

[0059] In some embodiments, the controller may include: a first comparator and a first processor.

[0060] The first comparator can be electrically connected to the electrolyzer 110 and the oxygen sensor 130, and the first comparator can be used to compare the input power of the electrolyzer 110 with the first target threshold, and compare the detection value of the oxygen sensor 130 with the second target threshold; the first processor can be electrically connected to the first comparator, and the first processor can be used to output a control instruction based on the comparison result, and the control instruction can be used to control the first control valve.

[0061] The first target threshold may range from 25% to 35%.

[0062] Specifically, the first target threshold may be 25%, 27.5%, 30%, 31.275%, 35%, or other values ​​between 25% and 35%, which are not limited here.

[0063] The second target threshold may range from 2.8% to 3.2%.

[0064] Specifically, the first target threshold may be 2.8%, 2.93%, 3%, 3.024%, 3.2% or other values ​​between 2.8% and 3.2%, which are not limited here.

[0065] In actual implementation, the electrolyzer 110 can feed back the input power to the first comparator, the first comparator can compare the input power with the first target threshold, the oxygen sensor 130 can feed back the detection value to the first comparator, the first comparator can compare the detection value with the second target threshold, the first comparator can feed back the comparison result to the first processor, and when the comparison result is that the input power of the electrolyzer 110 is lower than the first target threshold and the detection value of the oxygen sensor 130 is greater than the second target threshold, in response to the comparison result, the controller can output a control instruction, and the control instruction can control the first valve 140 to open, that is, the first delivery pipe 104 is switched to the on state, and the first gas can enter the N cathode chambers through the first delivery pipe 104.

[0066] The electrolysis hydrogen production system 100 provided in the embodiment of the present application, through the setting of the above-mentioned first comparator and the first processor, realizes data processing of the input power of the electrolytic cell 110 and the detection value of the oxygen sensor 130, as well as the instruction output of the first valve 140, providing hardware support for numerical comparison and improving the control accuracy of the process of injecting the first gas into N cathode chambers.

[0067] In some embodiments, as Figure 1-Figure 4 As shown, the electrolysis hydrogen production system 100 may further include: an oxygen gas-liquid separator 160 , a hydrogen sensor 170 , a second delivery pipe 105 and a second valve 180 .

[0068] The second valve 180 may be disposed on the second delivery pipe 105 . The controller may be electrically connected to the hydrogen sensor 170 and the second valve 180 . The controller may be configured to control the second valve 180 based on the input power of the electrolyzer 110 and / or the detection value of the hydrogen sensor 170 .

[0069] In actual implementation, Figure 1-Figure 4 As shown, when the electrolytic cell 110 operates at low power, the total amount of oxygen produced by the N anode chambers decreases, and the proportion of hydrogen in the total gas increases. Once the detection value of the hydrogen sensor 170 exceeds the set range, the controller can control the second valve 180 to open, and the second gas can enter the N anode chambers through the second delivery pipe 105. Specifically, the alkaline liquid leaving the oxygen gas-liquid separator 160 can be mixed with the second gas and circulated to the N anode chambers through the above-mentioned oxygen-side delivery pipe and the oxygen-side flow channel. In the process of continuously replenishing the second gas in the N anode chambers, the total amount of the mixed gas in each anode chamber continues to increase, and the hydrogen concentration in each anode chamber also gradually decreases accordingly, until the detection value of the hydrogen sensor 170 no longer fluctuates and stabilizes within the set range, and the oxygen concentration in each anode chamber reaches a equilibrium state.

[0070] It should be noted that if more precise control of the delivery volume of the second gas is required, the controller may control the delivery volume of the second gas per unit time by controlling the opening of the second valve 180 .

[0071] The electrolysis hydrogen production system 100 provided in the embodiment of the present application, through the setting of the above-mentioned second valve 180, based on the obtained input power of the electrolytic cell 110 and the detection value of the hydrogen sensor 170, the controller can change the conduction state of the second delivery pipe 105 by controlling the opening and closing of the second valve 180. When an abnormal hydrogen content in oxygen is detected, the controller can respond immediately and quickly replenish the second gas to each anode chamber to reduce the hydrogen content in oxygen, thereby solving the safety problem of the electrolysis hydrogen production system 100 when it is operated at low power.

[0072] In some embodiments, the controller further comprises: a second comparator and a second processor,

[0073] The second comparator is electrically connected to the electrolyzer 110 and the hydrogen sensor 170, and is used to compare the input power of the electrolyzer 110 with the first target threshold, and to compare the detection value of the hydrogen sensor 170 with the third target threshold; the second processor is electrically connected to the second comparator, and is used to output a control instruction based on the comparison result, and the control instruction is used to control the second valve 180.

[0074] The third target threshold may range from 1.8% to 2.2%.

[0075] Specifically, the first target threshold may be 1.8%, 1.96%, 2%, 2.137%, 2.2% or other values ​​between 1.8% and 2.2%, which are not limited here.

[0076] In actual implementation, the electrolyzer 110 can feed back the input power to the second comparator, the second comparator can compare the input power with the first target threshold, the hydrogen sensor 170 can feed back the detection value to the second comparator, the second comparator can compare the detection value with the third target threshold, and the second comparator can feed back the comparison result to the second processor. When the comparison result is that the input power of the electrolyzer 110 is lower than the first target threshold and the detection value of the hydrogen sensor 170 is greater than the third target threshold, in response to the comparison result, the controller can output a control instruction, and the control instruction can control the second valve 180 to open, that is, the second delivery pipe 105 is switched to the on state, and the second gas can enter the N anode chambers through the second delivery pipe 105.

[0077] The electrolysis hydrogen production system 100 provided in the embodiment of the present application realizes data processing of the input power of the electrolytic cell 110 and the detection value of the hydrogen sensor 170, as well as the instruction output to the second valve 180 through the configuration of the above-mentioned second comparator and the second processor, thereby providing hardware support for numerical comparison and improving the control accuracy of the process of injecting the second gas into N anode chambers.

[0078] In some embodiments, as Figure 1 、 Figure 2 and Figure 4 As shown, the first gas and the second gas are different, and the electrolysis hydrogen production system 100 further includes: a first gas source 101 and a second gas source 102 .

[0079] The first gas source 101 is connected to the N cathode chambers through the first delivery pipe 104 ; the second gas source 102 is connected to the N anode chambers through the second delivery pipe 105 .

[0080] In some embodiments, as Figure 1 As shown, the first gas may be hydrogen, the first gas source 101 may be the hydrogen storage device 190 , the second gas may be oxygen, and the second gas source 102 may be an external oxygen source.

[0081] In other embodiments, Figure 2 As shown, the first gas may be nitrogen, the first gas source 101 may be an external nitrogen source, the second gas may be oxygen, and the second gas source 102 may be an external oxygen source.

[0082] In some other embodiments, Figure 4As shown, the first gas may include carbon monoxide and carbon dioxide, the first gas source 101 may be an external mixed gas source of carbon monoxide and carbon dioxide, the second gas may be oxygen, and the second gas source 102 may be an external oxygen source.

[0083] The electrolysis hydrogen production system 100 provided in the embodiment of the present application provides different equipment support for the first gas and the second gas through the arrangement of the above-mentioned first gas source 101 and the second gas source 102. Under the design of multiple gas sources, the selection of the first gas and the second gas is more flexible. In particular, when the hydrogen storage device 190 is used as the first gas source 101, the first gas can be fully supplied by only using the existing structure, without the need for an external gas source, thereby saving manufacturing costs. At the same time, the purification device 150 does not need to add the process of removing the first gas, thereby shortening the process flow of hydrogen purification and improving hydrogen production efficiency.

[0084] In some embodiments, as Figure 3 As shown, the first gas and the second gas are the same, and the electrolysis hydrogen production system 100 further includes: a third gas source 103 .

[0085] The third gas source 103 is connected to the N cathode chambers through the first delivery pipe 104 , and the third gas source 103 is connected to the N anode chambers through the second delivery pipe 105 .

[0086] In this embodiment, if Figure 3 As shown, the first gas and the second gas are both nitrogen, and the third gas source 103 is an external nitrogen source.

[0087] In other embodiments, the first gas and the second gas are both helium, and the third gas source 103 is an external helium source.

[0088] The electrolysis hydrogen production system 100 provided in the embodiment of the present application, through the provision of the above-mentioned third gas source 103, realizes that the same gas source can provide the first gas and the second gas to N cathode chambers and N anode chambers respectively, thereby reducing the number of required parts, saving manufacturing costs, and facilitating assembly, disassembly and maintenance, thereby improving the maintainability of the electrolysis hydrogen production system 100.

[0089] In some embodiments, as Figure 1-Figure 4 As shown, the first gas may include at least one of hydrogen, nitrogen, carbon monoxide, carbon dioxide and an inert gas, and the electrolysis hydrogen production system 100 may further include: a purification device 150 and a hydrogen storage device 190, the inlet of the purification device 150 may be connected to the outlet of the hydrogen gas-liquid separator 120, the outlet of the purification device 150 may be connected to the inlet of the hydrogen storage device 190, and the oxygen sensor 130 may be located between the inlet of the purification device 150 and the outlet of the hydrogen gas-liquid separator 120.

[0090] For example, in some embodiments, Figure 1As shown, the first gas is hydrogen.

[0091] For example, in other embodiments, Figure 2-Figure 3 As shown, the first gas is nitrogen.

[0092] For example, in some other embodiments, Figure 4 As shown, the first gas includes carbon monoxide and carbon dioxide.

[0093] For example, in some other embodiments, the first gas is helium.

[0094] It is understandable that if Figure 1-Figure 4 As shown, when the oxygen content is qualified, the crude hydrogen to be purified can enter the purification device 150, where the crude hydrogen is deoxygenated and purified to obtain pure hydrogen. After leaving the purification device 150, the pure hydrogen enters the hydrogen storage device 190 for storage and standby use.

[0095] In this embodiment, when the first gas is hydrogen, the first delivery pipe 104 may be connected to the outlet of the hydrogen storage device 190 , and the hydrogen storage device 190 may be a gas source for the first gas.

[0096] The hydrogen storage device 190 may include but is not limited to a high-pressure hydrogen storage tank, a liquid hydrogen storage tank, or a solid-state hydrogen storage system, etc., which is not limited here.

[0097] For example, in some embodiments, the hydrogen storage device 190 is a high-pressure hydrogen storage tank.

[0098] The electrolysis hydrogen production system 100 provided in the embodiment of the present application, through the above-mentioned first gas type design, allows users to select a suitable type as the first gas according to actual needs, thereby improving the diversity and flexibility of the electrolysis hydrogen production system 100 in the selection of the first gas, thereby increasing the scope of use of the electrolysis hydrogen production system 100. At the same time, the introduction of the first gas will not significantly increase the operating cost of the electrolysis hydrogen production system 100, and after the first gas is introduced, it will not produce a distance reaction with the original mixed gas, and will effectively reduce the oxygen content in the hydrogen without affecting the water electrolysis reaction in the cathode chamber.

[0099] In some embodiments, as Figure 3 As shown, the first gas may include nitrogen, and the outlet of the hydrogen gas-liquid separator 120 may be used to connect to the ammonia production system 200 .

[0100] In this embodiment, Figure 3As shown, when the first gas is nitrogen, hydrogen mixed with nitrogen and alkaline liquid enters the hydrogen gas-liquid separator 120. After the alkaline liquid in the mixed gas is removed in the hydrogen gas-liquid separator 120, a portion of the crude hydrogen to be purified can enter the subsequent purification device 150. The purification device 150 can add a denitrification process on the basis of the original deoxygenation process to obtain pure hydrogen, and finally store the pure hydrogen in the hydrogen storage device 190. In addition, another portion of the crude hydrogen to be purified can enter the ammonia production system 200. The crude hydrogen to be purified can obtain a mixture of hydrogen and nitrogen through the deoxygenation process in the ammonia production system 200. The high-temperature and high-pressure hydrogen and nitrogen mixture can directly provide raw materials for the synthetic ammonia reaction.

[0101] The electrolysis hydrogen production system 100 provided in the embodiment of the present application is designed to connect the outlet of the hydrogen gas-liquid separator 120 to the ammonia production system 200 when the first gas includes nitrogen. The high-temperature and high-pressure mixed gas of hydrogen and nitrogen can directly provide raw materials for the ammonia synthesis reaction, shorten the process flow, improve the efficiency of ammonia synthesis, and further improve energy utilization efficiency.

[0102] In some embodiments, as Figure 4 As shown, the first gas may include carbon monoxide and carbon dioxide, and the outlet of the hydrogen gas-liquid separator 120 may be used to connect to the methanol production system 300 .

[0103] In this embodiment, Figure 4 As shown, in the case where the first gas includes carbon monoxide and carbon dioxide, the hydrogen mixture including carbon monoxide, carbon dioxide and alkaline solution enters the hydrogen gas-liquid separator 120. After the alkaline solution in the mixed gas is removed in the hydrogen gas-liquid separator 120, a portion of the crude hydrogen to be purified can enter the subsequent purification device 150. The purification device 150 can add a carbon monoxide removal process and a carbon dioxide removal process on the basis of the original deoxygenation process, thereby obtaining pure hydrogen, and finally storing the pure hydrogen in the hydrogen storage device 190. In addition, another portion of the crude hydrogen to be purified can enter the methanol preparation system 300. The crude hydrogen to be purified can obtain a mixed gas of hydrogen, carbon monoxide and carbon dioxide through a deoxygenation process in the methanol preparation system 300. The high-temperature and high-pressure mixed gas of hydrogen, carbon monoxide and carbon dioxide can directly provide raw materials for the methanol synthesis reaction.

[0104] The electrolysis hydrogen production system 100 provided in the embodiment of the present application is designed to connect the outlet of the hydrogen gas-liquid separator 120 to the methanol preparation system 300 when the first gas includes carbon monoxide and carbon dioxide. The high-temperature and high-pressure mixed gas of hydrogen, carbon monoxide and carbon dioxide can directly provide raw materials for the methanol synthesis reaction, shorten the process flow, improve the efficiency of methanol synthesis, and further improve energy utilization efficiency.

[0105] In some embodiments, the second gas includes at least one of oxygen, nitrogen, and an inert gas.

[0106] For example, in some embodiments, Figure 1 、 Figure 2 and Figure 4 As shown, the second gas is oxygen.

[0107] For example, in other embodiments, Figure 3 As shown, the second gas is nitrogen.

[0108] For example, in some other embodiments, the second gas is helium.

[0109] The electrolysis hydrogen production system 100 provided in the embodiment of the present application, through the above-mentioned second gas type design, allows users to select a suitable type as the second gas according to actual needs, thereby improving the diversity and flexibility of the electrolysis hydrogen production system 100 in the selection of the second gas, thereby increasing the scope of use of the electrolysis hydrogen production system 100.

[0110] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0111] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0112] In the description of this application, “plurality” means two or more.

[0113] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0114] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A hydrogen production system by electrolysis, characterized in that: include: An electrolytic cell, wherein the electrolytic cell defines N anode chambers and N cathode chambers, where N is a positive integer and is greater than or equal to 1, and has an oxygen-side gas-liquid outlet for communicating with the N anode chambers and a hydrogen-side gas-liquid outlet for communicating with the N cathode chambers; A hydrogen gas-liquid separator, wherein the inlet of the hydrogen gas-liquid separator is connected to the hydrogen side gas-liquid outlet; an oxygen sensor, the oxygen sensor being used to detect the oxygen concentration at the outlet of the hydrogen gas-liquid separator; a first delivery pipe, the first delivery pipe being in communication with the N cathode chambers and being configured to inject a first gas into the N cathode chambers, the first gas being non-oxygen; an oxygen gas-liquid separator, wherein the inlet of the oxygen gas-liquid separator is connected to the oxygen-side gas-liquid outlet; a hydrogen sensor, the hydrogen sensor being used to detect the hydrogen concentration at the outlet of the oxygen gas-liquid separator; A second delivery pipe is connected to the N anode chambers and is used to inject a second gas into the N anode chambers, where the second gas is non-hydrogen.

2. The electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: a first valve, the first valve being arranged on the first delivery pipe; A controller is electrically connected to the electrolytic cell, the oxygen sensor, and the first valve, and is configured to control the first valve based on an input power of the electrolytic cell and / or a detection value of the oxygen sensor.

3. The electrolysis hydrogen production system according to claim 2, characterized in that: The controller includes: a first comparator electrically connected to the electrolytic cell and the oxygen sensor, configured to compare the input power of the electrolytic cell with a first target threshold value, and to compare the detection value of the oxygen sensor with a second target threshold value; A first processor is electrically connected to the first comparator and is configured to output a control instruction based on a comparison result, wherein the control instruction is used to control the first valve.

4. The electrolysis hydrogen production system according to claim 2, characterized in that: Also includes: A second valve is arranged in the second delivery pipe, and the controller is electrically connected to the hydrogen sensor and the second valve, and is used to control the second valve based on the input power of the electrolyzer and / or the detection value of the hydrogen sensor.

5. The electrolysis hydrogen production system according to claim 4, characterized in that: The controller further includes: a second comparator electrically connected to the electrolyzer and the hydrogen sensor, configured to compare the input power of the electrolyzer with a first target threshold value, and to compare the detection value of the hydrogen sensor with a third target threshold value; A second processor is electrically connected to the second comparator and is configured to output a control instruction based on a comparison result, wherein the control instruction is used to control the second valve.

6. The electrolysis hydrogen production system according to claim 4, characterized in that: The first gas and the second gas are different, and the electrolysis hydrogen production system further includes: a first gas source, the first gas source being connected to the N cathode chambers through a first delivery pipe; A second gas source is connected to the N anode chambers through a second delivery pipe.

7. The electrolysis hydrogen production system according to claim 4, characterized in that: The first gas and the second gas are the same, and the electrolysis hydrogen production system further includes: A third gas source is connected to the N cathode chambers through a first delivery pipe, and is connected to the N anode chambers through a second delivery pipe.

8. The electrolysis hydrogen production system according to any one of claims 1 to 7, characterized in that: The first gas includes at least one of hydrogen, nitrogen, carbon monoxide, carbon dioxide and an inert gas, and the electrolysis hydrogen production system further includes: A purification device and a hydrogen storage device, the inlet of the purification device is connected to the outlet of the hydrogen gas-liquid separator, the outlet of the purification device is connected to the inlet of the hydrogen storage device, and the oxygen sensor is located between the inlet of the purification device and the outlet of the hydrogen gas-liquid separator.

9. The electrolysis hydrogen production system according to claim 8, characterized in that: The first gas includes nitrogen, and the outlet of the hydrogen gas-liquid separator is used to connect to an ammonia production system; or, The first gas includes carbon monoxide and carbon dioxide, and the outlet of the hydrogen gas-liquid separator is used to connect to a methanol preparation system.

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