Water electrolysis hydrogen production device

Abstract

The utility model discloses a water electrolysis hydrogen production device which comprises a combustion boiler, an alkali liquor circulation pipeline, a heat exchange circulation pipeline and a hydrogen output pipeline. The alkali liquor circulation pipeline is mainly used for leading alkali liquor obtained after hydrogen separation and oxygen separation back to the electrolytic bath; a first heat exchanger and a second heat exchanger located at the downstream of the first heat exchanger are arranged on the heat exchange circulation pipeline, the first heat exchanger and the combustion chamber are arranged in a heat exchange mode, and the second heat exchanger and the alkali liquor circulation pipeline are arranged in a heat exchange mode; the hydrogen output pipeline is arranged on the hydrogen production side of the electrolytic cell and is used for conveying crude hydrogen produced on the hydrogen production side to downstream process equipment; and a fuel inlet of the combustion chamber is connected with the hydrogen output pipeline through a fuel supply pipeline and can be switched into a connected state and a disconnected state. According to the water electrolysis hydrogen production device, the starting efficiency of the water electrolysis hydrogen production process can be greatly improved, and the operation efficiency of the whole device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water electrolysis hydrogen production, and more specifically to a water electrolysis hydrogen production device. Background Art

[0002] At present, in the process of hydrogen production by electrolysis of water, the startup conditions of the electrolyzer generally include two types, namely cold start condition and hot start condition. Among them, the cold start condition refers to the time when the electrolyzer is started, the temperature of the electrolyte alkali solution is near room temperature; the hot start condition refers to the time when the electrolyzer is started, the temperature of the electrolyte is above 60°C, which can ensure that the power of the electrolyzer can quickly reach full load and quickly realize hydrogen production.

[0003] However, the hydrogen production process by electrolysis of water, especially the cold start time of hydrogen production by alkaline electrolyzer, is relatively long, which results in the electrolyzer being unable to produce hydrogen quickly and fully loaded, resulting in reduced efficiency. In addition, the hydrogen produced by electrolysis at this time is unqualified hydrogen, so it is emptied, which greatly reduces the efficiency of electrolysis.

[0004] Therefore, how to improve the startup efficiency of a water electrolysis hydrogen production device under cold start conditions has become a technical problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0005] In view of this, the utility model provides a water electrolysis hydrogen production device to improve the starting efficiency of the water electrolysis hydrogen production device under cold start conditions.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model discloses a device for producing hydrogen by electrolyzing water, comprising:

[0008] Combustion boilers, including combustion chambers;

[0009] Alkali solution circulation pipeline;

[0010] a heat exchange circulation pipeline, on which a first heat exchanger and a second heat exchanger located downstream of the first heat exchanger are arranged, the first heat exchanger is arranged in heat exchange with the combustion chamber, and the second heat exchanger is arranged in heat exchange with the alkali solution circulation pipeline;

[0011] A hydrogen output pipeline is provided on the hydrogen production side of the electrolyzer and is used to transport the crude hydrogen produced by the hydrogen production side to downstream process equipment;

[0012] Wherein, the fuel inlet of the combustion chamber is connected to the hydrogen output pipeline through a fuel supply pipeline, and can be switched between a connected state and a disconnected state.

[0013] Optionally, the second heat exchanger is configured as an alkali liquid heat exchanger provided in the alkali liquid circulation pipeline.

[0014] Optionally, a first control valve is provided on the coolant supply pipeline connected to the cooling medium inlet of the alkali liquid heat exchanger; the heat exchange medium outlet of the first heat exchanger is connected to the coolant supply pipeline through a first connecting pipeline, and the connection node of the first connecting pipeline on the coolant supply pipeline is located between the first control valve and the cooling medium inlet of the alkali liquid heat exchanger, and a second control valve is provided on the first connecting pipeline.

[0015] Optionally, a first circulation pump and a first liquid storage tank are also provided on the heat exchange circulation pipeline, the liquid outlet of the first liquid storage tank is connected to the heat exchange medium inlet of the first heat exchanger through a second connecting pipeline, the first circulation pump is arranged on the second connecting pipeline, and a third control valve is arranged on the coolant discharge pipeline connected to the cooling medium outlet of the alkali liquid heat exchanger; the liquid return port of the first liquid storage tank is connected to the coolant discharge pipeline through a third connecting pipeline, the connection node of the third connecting pipeline on the coolant discharge pipeline is located between the cooling medium outlet of the alkali liquid heat exchanger and the third control valve, and a fourth control valve is arranged on the third connecting pipeline.

[0016] Optionally, the second heat exchanger is configured as a third heat exchanger that is arranged independently of the alkali liquid heat exchanger originally provided on the alkali liquid circulation pipeline, the cooling medium inlet of the third heat exchanger is connected to the heat exchange medium outlet of the first heat exchanger through a fourth connecting pipeline, and a fifth control valve is provided on the fourth connecting pipeline.

[0017] Optionally, a second circulation pump and a second liquid storage tank are also provided on the heat exchange circulation pipeline, the liquid outlet of the second liquid storage tank is connected to the heat exchange medium inlet of the first heat exchanger through a fifth connecting pipeline, the second circulation pump is arranged on the fifth connecting pipeline, and the liquid return port of the second liquid storage tank is connected to the cooling medium outlet of the third heat exchanger through a sixth connecting pipeline.

[0018] Optionally, the heat carrier medium used in the heat exchange circulation pipeline is configured as water or heat transfer oil.

[0019] Optionally, a first regulating valve and a sixth control valve are sequentially arranged on the hydrogen output pipeline, the first regulating valve is used to adjust the liquid level balance between the hydrogen separator and the oxygen separator, the sixth control valve is used to control the opening and closing of the hydrogen output pipeline, the connection node of the fuel supply pipeline on the hydrogen output pipeline is located between the first regulating valve and the sixth control valve, and a seventh control valve is arranged on the fuel supply pipeline, and the seventh control valve is used to control the conduction and disconnection of the fuel supply pipeline.

[0020] Optionally, it also includes an oxygen output pipeline arranged on the oxygen production side of the electrolyzer, and the oxygen output pipeline is used to deliver the crude oxygen produced by the oxygen production side to downstream process equipment or discharge it;

[0021] Wherein, the combustion chamber is connected to the oxygen output pipeline through a combustion-supporting supply pipeline, and can be switched between a connected state and a disconnected state.

[0022] Optionally, a second regulating valve and an eighth control valve are sequentially arranged on the oxygen output pipeline, the second regulating valve is used to adjust the pressure of the oxygen separator, the eighth control valve is used to control the opening and closing of the oxygen output pipeline, the combustion-supporting supply pipeline is located between the second regulating valve and the eighth control valve at the connection node of the oxygen output pipeline, and a ninth control valve is arranged on the combustion-supporting supply pipeline, and the ninth control valve is used to control the conduction and disconnection of the combustion-supporting supply pipeline.

[0023] Compared with the background technology introduction, the above-mentioned water electrolysis hydrogen production device includes a combustion boiler, an alkali liquid circulation pipeline, a heat exchange circulation pipeline and a hydrogen output pipeline, wherein the combustion boiler includes a combustion chamber; the alkali liquid circulation pipeline is mainly used to lead the alkali liquid after hydrogen separation and oxygen separation back to the electrolyzer; a first heat exchanger and a second heat exchanger located downstream of the first heat exchanger are arranged on the heat exchange circulation pipeline, the first heat exchanger is arranged in a heat exchange arrangement with the combustion chamber, and the second heat exchanger is arranged in a heat exchange arrangement with the alkali liquid circulation pipeline; the hydrogen output pipeline is arranged on the hydrogen production side of the electrolyzer, and is used to transport the crude hydrogen produced on the hydrogen production side to downstream process equipment; and the fuel inlet of the combustion chamber is connected to the hydrogen output pipeline through a fuel supply pipeline, and can be switched between a connected state and a disconnected state. In actual application, the water electrolysis hydrogen production device connects the fuel inlet of the combustion chamber of the combustion boiler with the hydrogen output pipeline through the fuel supply pipeline, and can be switched to a connected state and a disconnected state, so that the water electrolysis hydrogen production device can supply the crude hydrogen produced by the hydrogen output pipeline to the combustion chamber of the combustion boiler under the cold start condition for combustion in the combustion chamber, without the need to discharge the hydrogen produced under the cold start condition, so that this part of the hydrogen energy is fully recycled and utilized, and the problem of energy waste is avoided; more importantly, since the first heat exchanger on the heat exchange circulation pipeline is arranged in heat exchange with the combustion chamber, and the second heat exchanger is arranged in heat exchange with the alkali solution circulation pipeline, the heat exchange circulation pipeline The heat generated by the combustion of hydrogen in the combustion chamber can be absorbed by the first heat exchanger, and the heat absorbed by the heat exchange circulation pipeline can be transferred to the alkali liquid circulation pipeline through the second heat exchanger, so that the alkali liquid returning to the electrolyzer can be heated, thereby achieving rapid temperature rise of the alkali liquid, so that the electrolyzer can reach full load operation requirements more quickly, and effectively solves the problem of low efficiency caused by the electrolyzer not being able to quickly reach full load hydrogen production under cold start conditions and the problem that the hydrogen produced by electrolysis is unqualified for a long time. That is, the water electrolysis hydrogen production device using the above structure can greatly improve the startup efficiency of the water electrolysis hydrogen production process and improve the operating efficiency of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the first structure of a water electrolysis hydrogen production device provided in an embodiment of the utility model;

[0026] Figure 2 A second structural schematic diagram of a water electrolysis hydrogen production device provided in an embodiment of the utility model;

[0027] Figure 3 A third structural schematic diagram of the water electrolysis hydrogen production device provided in an embodiment of the utility model;

[0028] Figure 4 A fourth structural schematic diagram of the water electrolysis hydrogen production device provided in an embodiment of the utility model.

[0029] in, Figure 1-Figure 4 middle:

[0030] 1-Electrolyzer;

[0031] 2- Hydrogen separator;

[0032] 3- oxygen separator;

[0033] 4-alkali solution heat exchanger;

[0034] 5-Alkali solution circulation pump;

[0035] 6- Hydrogen scrubber;

[0036] 7- Oxygen scrubber;

[0037] 8-Hydrogen heat exchanger;

[0038] 9- oxygen heat exchanger;

[0039] 10-first gas-water separator;

[0040] 11- second gas-water separator;

[0041] 12- first regulating valve;

[0042] 13- second regulating valve;

[0043] 14- Combustion boiler;

[0044] 15-sixth control valve;

[0045] 16-seventh control valve;

[0046] 17- second control valve;

[0047] 18- first control valve;

[0048] 19- fourth control valve;

[0049] 20-third control valve; 21-first circulation pump; 22-first liquid storage tank; 23-second circulation pump; 24-second liquid storage tank; 25-fifth control valve; 26-hydrogen output pipeline;

[0050] 27- oxygen output pipeline;

[0051] 28- fuel supply pipeline;

[0052] 29-alkali solution circulation pipeline;

[0053] 30-Coolant supply line;

[0054] 31- first connecting pipeline;

[0055] 32- second connecting pipeline;

[0056] 33-Coolant drain line;

[0057] 34- third connecting pipeline;

[0058] 35-third heat exchanger; 36-fourth connecting pipeline;

[0059] 37- fifth connecting pipeline;

[0060] 38-sixth connecting pipeline;

[0061] 39-Combustion supply pipeline;

[0062] 40 - the eighth control valve; 41 - the ninth control valve. DETAILED DESCRIPTION

[0063] The core of the utility model is to provide a water electrolysis hydrogen production device to improve the starting efficiency of the water electrolysis hydrogen production device under cold start conditions.

[0064] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0065] Reference Figure 1-Figure 4 As shown, the utility model provides a water electrolysis hydrogen production device, including a combustion boiler 14, an alkali liquid circulation pipeline 29, a heat exchange circulation pipeline and a hydrogen output pipeline 26, wherein the combustion boiler 14 includes a combustion chamber; the alkali liquid circulation pipeline 29 is mainly used to lead the alkali liquid after hydrogen separation and oxygen separation back to the electrolytic cell 1, specifically refer to Figure 1-Figure 4, which can lead the liquid phase separated by the hydrogen separator 2 and the oxygen separator 3 back to the inlet of the electrolyzer 1, and a first heat exchanger and a second heat exchanger located downstream of the first heat exchanger are arranged on the heat exchange circulation pipeline, the first heat exchanger is arranged for heat exchange with the combustion chamber, and the second heat exchanger is arranged for heat exchange with the alkali liquid circulation pipeline 29, and the hydrogen output pipeline 26 is arranged on the hydrogen production side of the electrolyzer 1, and is used to transport the crude hydrogen produced on the hydrogen production side to the downstream process equipment; and the fuel inlet of the combustion chamber is connected to the hydrogen output pipeline 26 through the fuel supply pipeline 28, and can be switched to a connected state and a disconnected state.

[0066] It should be noted that the first heat exchanger can specifically be the water boiling chamber of the combustion boiler 14, or it can be other heat exchanger structures other than the water boiling chamber, and the second heat exchanger can specifically be the alkali liquid heat exchanger 4 on the alkali liquid circulation pipeline 29, or it can be other heat exchangers other than the alkali liquid heat exchanger 4, such as the third heat exchanger 35 mentioned below.

[0067] In actual application, the water electrolysis hydrogen production device connects the fuel inlet of the combustion chamber of the combustion boiler 14 with the hydrogen output pipeline 26 through the fuel supply pipeline 28, and can be switched between a connected state and a disconnected state, so that the water electrolysis hydrogen production device can supply the crude hydrogen produced by the hydrogen output pipeline 26 to the combustion chamber of the combustion boiler 14 under cold start conditions for combustion in the combustion chamber, without the need to discharge the hydrogen produced under cold start conditions, thereby fully recycling this part of the hydrogen energy and avoiding the problem of energy waste; more importantly, since the first heat exchanger on the heat exchange circulation pipeline is arranged in heat exchange with the combustion chamber, and the second heat exchanger is arranged in heat exchange with the alkali solution circulation pipeline 29, the heat exchange The circulation pipeline can absorb the heat generated by the combustion of hydrogen in the combustion chamber through the first heat exchanger, and can transfer the heat absorbed by the heat exchange circulation pipeline to the alkali solution circulation pipeline 29 through the second heat exchanger, so that the alkali solution returning to the electrolyzer 1 can be heated, achieving rapid temperature rise of the alkali solution, so that the electrolyzer 1 can reach the full load operation requirement more quickly, and effectively solves the problem of low efficiency caused by the inability of the electrolyzer 1 to quickly reach full load hydrogen production under cold start conditions and the problem that the hydrogen produced by electrolysis is unqualified for a long time. That is, the water electrolysis hydrogen production device using the above-mentioned structure can greatly improve the startup efficiency of the water electrolysis hydrogen production process and improve the operating efficiency of the entire device.

[0068] It should be noted that those skilled in the art should be aware of the basic working process of hydrogen production by electrolysis of water. Figure 1-Figure 4 , taking alkaline water electrolysis to produce hydrogen as an example, the basic working structure and working process of water electrolysis to produce hydrogen are briefly described:

[0069] When the electrolyzer 1 electrolyzes water, it has a corresponding hydrogen production side and an oxygen production side, wherein the gas-liquid mixture produced by the outlet of the electrolyzer 1 corresponding to the hydrogen production side needs to pass through the hydrogen separator 2 for gas-liquid separation, and the liquid phase outlet of the hydrogen separator 2 (corresponding to the alkaline electrolysis water hydrogen production type, the main component flowing out is alkali liquid) is connected to the return liquid port of the electrolyzer 1 through the alkali liquid circulation pipeline 29, and the alkali liquid circulation pipeline 29 can be designed with alkali liquid circulation pump 5 and alkali liquid heat exchanger 4 and other related components, the gas phase outlet of the hydrogen separator 2 is connected to the hydrogen scrubber 6, and the hydrogen scrubber 6 should be connected to a corresponding water replenishment mechanism, which can specifically include a water supply source for supplying pure water, and the water supply source supplies pure water to the hydrogen scrubber 6 through a pipeline and a water pump, and the corresponding pipeline can be arranged with a first water replenishment valve, through which the pure water entering the hydrogen scrubber 6 can be adjusted. The water replenishment mechanism is preferably connected to the top position of the hydrogen scrubber 6, where the top position refers to the top surface of the hydrogen scrubber 6 or a position close to the top surface. By designing this structural form, pure water flows downward from the top and countercurrently contacts the gas phase inside the hydrogen scrubber 6, which greatly improves the washing efficiency of the gas phase. When the hydrogen scrubber 6 is used to wash the gas phase material, corresponding to the alkaline electrolysis of water to produce hydrogen, the main function of washing is to wash away alkaline substances such as alkali solution. The gas phase material after washing by the hydrogen scrubber 6 generally needs to enter the first gas-water separator 10 for gas-water separation to remove water from the gas phase material. The gas phase material after passing through the first gas-water separator 10 can be transported to the downstream process equipment (such as a purification device, etc.) through the crude hydrogen delivery pipeline 26 (on which the corresponding sixth switch valve 15 is generally designed). Among them, the corresponding hydrogen scrubber 6 and the first gas-water separator 10 can be designed as a reference Figure 1-Figure 4 In the manner shown, a hydrogen heat exchanger 8, also called a cooler, is designed between the two, and its main purpose is to cool the gas phase material produced by the hydrogen scrubber 6, and a certain amount of water can be removed in the process; of course, the corresponding hydrogen scrubber 6 and the first gas-water separator 10 can also be designed to be directly connected. In actual application, the configuration can be selected according to actual needs, and no more specific restrictions are made here.

[0070] Similarly, the gas-liquid mixture produced by the outlet of the electrolyzer 1 corresponding to the oxygen production side needs to pass through the oxygen separator 3 for gas-liquid separation. The liquid phase outlet of the oxygen separator 3 (corresponding to the alkaline electrolysis water hydrogen production type, the main component flowing out is alkali liquid) is connected to the liquid return port of the electrolyzer 1 through the alkali liquid circulation pipeline 29. The alkali liquid circulation pipeline 29 can be designed with related components such as an alkali liquid circulation pump 5 and an alkali liquid heat exchanger 4. Among them, the liquid phase outlet of the hydrogen separator 2 and the liquid phase outlet of the oxygen separator 3 can share a set of alkali liquid circulation pipelines 29, which helps to simplify the structure. Of course, two sets of independent alkali liquid circulation pipelines can also be used. The gas phase outlet of the oxygen separator 3 is connected to the oxygen scrubber 7, and the oxygen scrubber 7 should be connected to a corresponding water replenishment mechanism. The water replenishment mechanism can specifically include a water supply source that supplies pure water. The water supply source supplies pure water to the water through pipelines and water pumps. The oxygen scrubber 7 should be connected, and the corresponding pipeline can be arranged with a second water replenishment valve, through which the amount of pure water entering the oxygen scrubber 7 can be adjusted. The water replenishment mechanism is preferably connected to the top position of the oxygen scrubber 7, and the top position here refers to the top surface of the oxygen scrubber 7 or a position close to the top surface. By designing it into this structural form, pure water flows downward from its upper part and contacts with the gas phase inside the oxygen scrubber 7 in countercurrent, which greatly improves the washing efficiency of the gas phase. When the oxygen scrubber 7 is used to wash the gas phase material, corresponding to the alkaline electrolysis of water to produce hydrogen type, the washing function is mainly to wash away alkaline substances such as alkali solution. Among them, the hydrogen scrubber 6 and the oxygen scrubber 7 can share a set of water replenishment mechanism, which helps to simplify the structure. Of course, two independent water replenishment mechanisms can also be used, and no more specific restrictions are made here. In addition, the gas phase material after being washed by the oxygen scrubber 7 generally needs to enter the second gas-water separator 11 for gas-water separation to remove water in the gas phase material. The gas phase material after passing through the second gas-water separator 11 can be transported to downstream process equipment (such as a purification device, etc.) through the crude oxygen delivery pipeline 27 (on which a corresponding second regulating valve 13 is generally designed) or directly discharged. Among them, the corresponding oxygen scrubber 7 and the second gas-water separator 11 can be designed as a reference Figure 1-Figure 4 In the manner shown, an oxygen heat exchanger 9, also called a cooler, is designed between the two, and its main purpose is to cool the gas phase material produced by the oxygen scrubber 7, and a certain amount of water can be removed in the process; of course, the oxygen heat exchanger 9 may not be arranged between the corresponding oxygen scrubber 7 and the second gas-water separator 11. In actual application, the configuration can be selected according to actual needs, and no more specific limitation is made here.

[0071] In some specific embodiments, reference Figure 1 and Figure 2When the above-mentioned water electrolysis hydrogen production device is specifically applied to the production of hydrogen by alkali solution water electrolysis, the above-mentioned second heat exchanger can be specifically configured as the alkali solution heat exchanger 4 provided in the alkali solution circulation pipeline 29, and the first control valve 18 is provided on the cooling liquid supply pipeline 30 connected to the cooling medium inlet of the alkali solution heat exchanger 4; the heat exchange medium outlet of the first heat exchanger is connected to the cooling liquid supply pipeline 30 through the first connecting pipeline 31, and the connection node of the first connecting pipeline 31 in the cooling liquid supply pipeline 30 is located between the first control valve 18 and the cooling medium inlet of the alkali solution heat exchanger, and the second control valve 17 is provided on the first connecting pipeline 31. Therefore, under the cold start condition, by closing the first control valve 18 and opening the second control valve 17, the alkali liquid heat exchanger 4 can heat the alkali liquid circulation pipeline 29, so that the electrolytic cell 1 can be quickly heated up; when the electrolytic cell 1 leaves the cold start condition and enters the hot start condition, the first control valve 18 is opened and the second control valve 17 is closed, so that the alkali liquid heat exchanger 4 can cool the liquid phase in the alkali liquid circulation pipeline 29 to avoid the alkali liquid temperature being too high and keep it within a reasonable temperature range, thereby making the hydrogen production efficiency higher.

[0072] In a further embodiment, referring to Figure 2 As shown, the heat exchange circulation pipeline may also include a first circulation pump 21 and a first liquid storage tank 22. The liquid outlet of the first liquid storage tank 22 is connected to the heat exchange medium inlet of the first heat exchanger through a second connecting pipeline 32. The first circulation pump 21 is arranged on the second connecting pipeline 32. The cooling liquid discharge pipeline 33 connected to the cooling medium outlet of the alkali liquid heat exchanger 4 is provided with a third control valve 20. The return liquid port of the first liquid storage tank 22 is connected to the cooling liquid discharge pipeline 33 through a third connecting pipeline 34. The connection node of the third connecting pipeline 34 on the cooling liquid discharge pipeline 33 is located between the cooling medium outlet of the alkali liquid heat exchanger 4 and the third control valve 20. The fourth control valve 19 is arranged on the third connecting pipeline 34. In this way, the heat exchange circulation pipeline forms a circulation loop through the first circulation pump 21, the first liquid storage tank 22, the first connecting pipeline 31, the second connecting pipeline 32 and the third connecting pipeline 34, so that energy is continuously recycled and reused, which helps to improve energy efficiency and the temperature rise rate of the alkali liquid circulation pipeline 29. Similarly, under cold start conditions, by closing the first control valve 18 and the third control valve 20 and opening the second control valve 17 and the fourth control valve 19, the alkali liquid heat exchanger 4 can heat the alkali liquid circulation pipeline 29, thereby enabling the electrolytic cell 1 to quickly heat up; when the electrolytic cell 1 leaves the cold start condition and enters the hot start condition, the first control valve 18 and the third control valve 20 are opened, and the second control valve 17 and the fourth control valve 19 are closed, so that the alkali liquid heat exchanger 4 can cool the liquid phase in the alkali liquid circulation pipeline 29 to avoid excessive alkali liquid temperature and keep it within a reasonable temperature range, thereby making the hydrogen production efficiency higher.

[0073] It should be noted that, for the first liquid storage tank 22, in order to realize the addition of cooling medium, such as adding cooling medium when starting up for the first time, a corresponding cooling medium interface should be designed on the first liquid storage tank 22. At the same time, for the convenience of operation, a corresponding drainage pipe outlet can be designed at the bottom.

[0074] It should also be noted that when the heat exchange circulation pipeline is not designed into the structural form of the above-mentioned circulation loop, for example, the heat exchange medium inlet of the first heat exchanger is directly connected to the water source, the coolant discharge pipeline 33 connected to the cooling medium outlet of the alkali liquid heat exchanger 4 can be directly used as a hot water supply pipeline, or connected to other corresponding equipment that requires hot water. In actual application, it can be designed according to actual needs, and no more specific limitations are made here.

[0075] In some other specific embodiments, referring to Figure 3 and Figure 4 As shown, the second heat exchanger can also be configured as a third heat exchanger 35 that is independently arranged with the alkali liquid heat exchanger 4 originally provided on the alkali liquid circulation pipeline 29, that is, in addition to the alkali liquid heat exchanger 4, the alkali liquid circulation pipeline 29 is additionally provided with a third heat exchanger 35, and the cooling medium inlet of the third heat exchanger 35 is connected with the heat exchange medium outlet of the first heat exchanger through a fourth connecting pipeline 36, and a fifth control valve 25 is provided on the fourth connecting pipeline 36. By designing into this structural form, the heat carrier medium used in the heat exchange circulation pipeline has more selectivity, specifically water or heat transfer oil, etc., and is not limited by the structure and operation of the alkali liquid heat exchanger 4, and the arrangement and control are more convenient and flexible.

[0076] In a further embodiment, referring to Figure 3 and Figure 4The heat exchange circulation pipeline may also include a second circulation pump 23 and a second liquid storage tank 24. The liquid outlet of the second liquid storage tank 24 is connected to the heat exchange medium inlet of the first heat exchanger through a fifth connecting pipeline 37. The second circulation pump 23 is arranged on the fifth connecting pipeline 37. The liquid return port of the second liquid storage tank 24 is connected to the cooling medium outlet of the third heat exchanger 35 through a sixth connecting pipeline 38. Similarly, the above arrangement, through the second circulation pump 23, the second liquid storage tank 24, the fourth connecting pipeline 36, the fifth connecting pipeline 37 and the sixth connecting pipeline 38, can make the heat exchange circulation pipeline form a circulation loop, so that energy is continuously recycled and reused, which helps to improve energy efficiency and the temperature rise rate of the alkali solution circulation pipeline 29, that is, the temperature rise rate of the electrolytic cell 1. Its specific working process is: under the cold start condition, the fifth control valve 25 is controlled to be opened, and the additional heater 35 can be used to heat the alkali liquid circulation pipeline 29, so that the electrolyzer 1 can be quickly heated; when the electrolyzer 1 leaves the cold start condition and enters the hot start condition, the fifth control valve 25 is controlled to be closed, and the additional heater 35 does not work. At this time, the alkali liquid heat exchanger 4 can cool the liquid phase in the alkali liquid circulation pipeline 29 by opening the first control valve 18 and the third control valve 20 normally, so as to avoid the alkali liquid temperature being too high and keep it within a reasonable temperature range, thereby making the hydrogen production efficiency higher. During this working process, the additional heater 35 is not subject to the working limit of the alkali liquid heat exchanger 4, and can be selectively opened more freely.

[0077] It should be noted that the heat carrier medium used in the above-mentioned heat exchange circulation pipeline is not further limited, and can be specifically configured as a heat carrier medium such as water or heat transfer oil.

[0078] In some specific embodiments, reference Figure 1-Figure 4 The hydrogen output pipeline 26 may be provided with a first regulating valve 12 and a sixth control valve 15 in sequence. The first regulating valve 12 is used to adjust the liquid level balance between the hydrogen separator 2 and the oxygen separator 3. The sixth control valve 15 is used to control the opening and closing of the hydrogen output pipeline 26. The fuel supply pipeline 28 is located between the first regulating valve 12 and the sixth control valve 15 at the connection node of the hydrogen output pipeline 26. The fuel supply pipeline 28 is provided with a seventh control valve 16, and the seventh control valve 16 is used to control the conduction and disconnection of the fuel supply pipeline 28. By designing the above-mentioned structural form, the first regulator 12 is located upstream of the connection node of the fuel supply pipeline 28 on the hydrogen output pipeline 26, and will not affect the normal adjustment function of the first regulating valve 12, which can ensure that the operation of the hydrogen production side is more stable, and help to achieve flexible hydrogen production. In addition, through the seventh control valve 16, it can be selected at any time whether to send hydrogen into the combustion chamber. For example, when it is in a non-cold start condition, hydrogen can open the sixth control valve 15 through the hydrogen output pipeline 26, so that the crude hydrogen enters the downstream process links, such as purification equipment.

[0079] In some other specific embodiments, referring to Figure 1-Figure 4 The above-mentioned water electrolysis hydrogen production device may also include an oxygen output pipeline 27 arranged on the oxygen production side of the electrolyzer 1, and the oxygen output pipeline 27 is used to send the crude oxygen produced by the oxygen production side to the downstream process equipment or vent; wherein, with reference to Figure 4 As shown, the combustion chamber can be connected to the oxygen output pipeline 27 through the combustion-supporting supply pipeline 39, and can be switched between a connected state and a disconnected state. Thus, the crude oxygen produced by the water electrolysis hydrogen production device can be further utilized, avoiding energy waste caused by direct venting.

[0080] In a further embodiment, referring to Figure 4 The oxygen output pipeline 27 may be provided with a second regulating valve 13 and an eighth control valve 40 in sequence. The second regulating valve 13 is used to regulate the pressure of the oxygen separator 3. The eighth control valve 40 is used to control the opening and closing of the oxygen output pipeline 27. The connection node of the combustion-supporting supply pipeline 39 at the oxygen output pipeline 27 is located between the second regulating valve 13 and the eighth control valve 40. The combustion-supporting supply pipeline 39 is provided with a ninth control valve 41, which is used to control the conduction and disconnection of the combustion-supporting supply pipeline 39. By designing the second regulating valve 13 upstream of the connection node of the combustion-supporting supply pipeline 39 at the oxygen output pipeline 27, it can be ensured that the regulating function of the second regulating valve 13 is not affected by the combustion-supporting supply pipeline 39, and the stability of its pressure regulation on the oxygen separator 3 is ensured, which is more conducive to the realization of flexible hydrogen production.

[0081] It should be noted that those skilled in the art should be able to understand that flexible hydrogen production means that when the operating parameters, such as power, temperature, flow rate and other parameters, change, the water electrolysis hydrogen production device can still operate smoothly, for example, the system pressure, the liquid level balance control of the hydrogen separator 2 and the oxygen separator 3 are stable.

[0082] In addition, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0083] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0084] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0085] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0086] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A hydrogen production device by electrolysis of water, characterized in that: include: A combustion boiler (14) comprising a combustion chamber; Alkali solution circulation pipeline (29); a heat exchange circulation pipeline, on which a first heat exchanger and a second heat exchanger located downstream of the first heat exchanger are arranged, the first heat exchanger is arranged in a heat exchange arrangement with the combustion chamber, and the second heat exchanger is arranged in a heat exchange arrangement with the alkali solution circulation pipeline (29); A hydrogen output pipeline (26) is arranged on the hydrogen production side of the electrolyzer (1) and is used to transport the crude hydrogen produced by the hydrogen production side to downstream process equipment; The fuel inlet of the combustion chamber is connected to the hydrogen output pipeline (26) through a fuel supply pipeline (28), and can be switched between a connected state and a disconnected state.

2. The water electrolysis hydrogen production device according to claim 1, characterized in that: The second heat exchanger is configured as an alkali liquid heat exchanger (4) provided in the alkali liquid circulation pipeline (29).

3. The water electrolysis hydrogen production device according to claim 2, characterized in that: A first control valve (18) is provided on the cooling liquid supply pipeline (30) connected to the cooling medium inlet of the alkali liquid heat exchanger (4); the heat exchange medium outlet of the first heat exchanger is connected to the cooling liquid supply pipeline (30) through a first connecting pipeline (31); a connection node of the first connecting pipeline (31) on the cooling liquid supply pipeline (30) is located between the first control valve (18) and the cooling medium inlet of the alkali liquid heat exchanger; and a second control valve (17) is provided on the first connecting pipeline (31).

4. The water electrolysis hydrogen production device according to claim 3, characterized in that: The heat exchange circulation pipeline is also provided with a first circulation pump (21) and a first liquid storage tank (22); the liquid outlet of the first liquid storage tank (22) is connected to the heat exchange medium inlet of the first heat exchanger via a second connecting pipeline (32); the first circulation pump (21) is arranged on the second connecting pipeline (32); a third control valve (20) is arranged on the cooling liquid discharge pipeline (33) connected to the cooling medium outlet of the alkali liquid heat exchanger (4); the liquid return port of the first liquid storage tank (22) is connected to the cooling liquid discharge pipeline (33) via a third connecting pipeline (34); the connection node of the third connecting pipeline (34) on the cooling liquid discharge pipeline (33) is located between the cooling medium outlet of the alkali liquid heat exchanger (4) and the third control valve (20); and a fourth control valve (19) is arranged on the third connecting pipeline (34).

5. The water electrolysis hydrogen production device according to claim 1, characterized in that: The second heat exchanger is configured as a third heat exchanger (35) which is arranged independently of the alkali liquid heat exchanger (4) originally provided on the alkali liquid circulation pipeline (29); the cooling medium inlet of the third heat exchanger (35) is connected to the heat exchange medium outlet of the first heat exchanger via a fourth connecting pipeline (36), and a fifth control valve (25) is provided on the fourth connecting pipeline (36).

6. The water electrolysis hydrogen production device according to claim 5, characterized in that: A second circulation pump (23) and a second liquid storage tank (24) are also provided on the heat exchange circulation pipeline. The liquid outlet of the second liquid storage tank (24) is connected to the heat exchange medium inlet of the first heat exchanger via a fifth connecting pipeline (37). The second circulation pump (23) is provided on the fifth connecting pipeline (37). The liquid return port of the second liquid storage tank (24) is connected to the cooling medium outlet of the third heat exchanger (35) via a sixth connecting pipeline (38).

7. The water electrolysis hydrogen production device according to claim 1, characterized in that: The heat carrier medium used in the heat exchange circulation pipeline is configured as water or heat transfer oil.

8. The water electrolysis hydrogen production device according to claim 1, characterized in that: The hydrogen output pipeline (26) is provided with a first regulating valve (12) and a sixth control valve (15) in sequence, wherein the first regulating valve (12) is used to regulate the liquid level balance between the hydrogen separator (2) and the oxygen separator (3), and the sixth control valve (15) is used to control the opening and closing of the hydrogen output pipeline (26). The connection node of the fuel supply pipeline (28) on the hydrogen output pipeline (26) is located between the first regulating valve (12) and the sixth control valve (15), and the fuel supply pipeline (28) is provided with a seventh control valve (16), and the seventh control valve (16) is used to control the conduction and disconnection of the fuel supply pipeline (28).

9. The water electrolysis hydrogen production device according to claim 1, characterized in that: It also includes an oxygen output pipeline (27) arranged on the oxygen production side of the electrolytic cell (1), and the oxygen output pipeline (27) is used to deliver the crude oxygen produced by the oxygen production side to downstream process equipment or discharge it; The combustion chamber is connected to the oxygen output pipeline (27) via a combustion-supporting supply pipeline (39), and can be switched between a connected state and a disconnected state.

10. The water electrolysis hydrogen production device according to claim 9, characterized in that: The oxygen output pipeline (27) is provided with a second regulating valve (13) and an eighth control valve (40) in sequence, wherein the second regulating valve (13) is used to regulate the pressure of the oxygen separator (3), and the eighth control valve (40) is used to control the opening and closing of the oxygen output pipeline (27); the connection node of the combustion-supporting supply pipeline (39) on the oxygen output pipeline (27) is located between the second regulating valve (13) and the eighth control valve (40), and the combustion-supporting supply pipeline (39) is provided with a ninth control valve (41), and the ninth control valve (41) is used to control the conduction and disconnection of the combustion-supporting supply pipeline (39).

Images