Water electrolysis device with oxyhydrogen liquid level stabilizing system and control method of water electrolysis device

Abstract

The invention discloses a water electrolysis device with an oxyhydrogen liquid level stabilizing system and a control method of the water electrolysis device. The water electrolysis device comprises an electrolytic bath (16), an oxygen-liquid separator assembly, a hydrogen-liquid separator assembly, an interlocking loop (3), a hydrogen side alkali liquor circulating assembly, a hydrogen side alkali liquor circulating assembly, an oxygen side alkali liquor circulating assembly, an alkali supplementing assembly and a nitrogen charging assembly. According to the hydrogen-oxygen liquid level adjusting device, the linkage loop is adopted, the oxygen side liquid level meter, the hydrogen side liquid level meter, the oxygen pressure storage tank, the hydrogen pressure storage tank, the oxygen pressure adjusting valve and the hydrogen pressure adjusting valve are coupled, the hydrogen-oxygen liquid level is rapidly adjusted, rapid balance of the hydrogen-oxygen liquid level is achieved, and therefore the situation that water electrolysis equipment is damaged due to the fact that the hydrogen-oxygen liquid level difference is too large is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen production by electrolysis of water, and in particular relates to a water electrolysis device with a hydrogen and oxygen liquid level stabilization system, a control method thereof, and hydrogen production equipment comprising the same. Background Art

[0002] With the rapid development of renewable energy and the continuous advancement of clean energy technology, water electrolysis hydrogen production technology has attracted much attention due to its zero emissions, high efficiency and energy storage potential. As the core equipment for realizing water electrolysis hydrogen production, the operation stability and safety of the water electrolysis device are crucial to the performance of the entire system. However, in actual operation, the water electrolysis device faces problems such as unbalanced hydrogen and oxygen production and large differences in production rate response speed. These problems often lead to imbalanced liquid levels in the hydrogen and oxygen liquid separator, which in turn poses risks to the safety of the water electrolysis device.

[0003] The water electrolysis device mainly consists of two parts: the electrolyzer and the gas-liquid separator. The electrolyzer produces hydrogen and oxygen by electrolyzing water, and the hydrogen and oxygen enter the hydrogen gas-liquid separator and oxygen liquid separator through the hydrogen side alkali liquid circulation pipeline and the oxygen side alkali liquid circulation pipeline for separation. In this process, the output of hydrogen is usually twice that of oxygen, and the production rates of hydrogen and oxygen respond differently to fluctuations in the production power.

[0004] Due to the imbalance in the production of hydrogen and oxygen and the difference in the response speed of the production rate, the hydrogen-oxygen liquid-liquid separator is prone to liquid level imbalance during operation. Specifically, when the production power fluctuates, the production rates of hydrogen and oxygen will change, but because the hydrogen production is twice that of oxygen and the hydrogen production rate responds faster, the liquid level of the hydrogen-liquid separator tends to rise, while the liquid level of the oxygen-liquid separator may drop. This liquid level imbalance will cause the pressure difference on both sides of the hydrogen-oxygen liquid-liquid separator diaphragm to be too large, causing irreversible damage to the diaphragm, thereby affecting the separation effect of hydrogen and oxygen.

[0005] A large difference in the liquid level of the hydrogen and oxygen liquid separator will bring great risks to the safety of the water electrolysis device. First, the excessive pressure difference may cause the diaphragm to rupture, causing hydrogen and oxygen to mix, thus causing safety accidents such as explosions. Second, the imbalance of the liquid level may also affect the normal operation of the water electrolysis device, reducing the hydrogen production efficiency and energy utilization efficiency.

[0006] At present, the problem of imbalanced liquid level in hydrogen and oxygen liquid-liquid separators in water electrolysis devices is mainly solved by adjusting the opening of the regulating valve on the gas discharge pipes of the gas-liquid separators on both sides of hydrogen and oxygen. By adjusting the flow rate of gas discharge, the pressure in the hydrogen and oxygen separation gas is passively adjusted, and then the liquid level is balanced through the connecting pipe between the hydrogen and oxygen separators. However, due to the hysteresis of the regulating valve in adjusting the flow rate, pressure balance often takes some time. The current adjustment method cannot quickly achieve hydrogen and oxygen liquid level balance.

[0007] Therefore, in order to solve the problem of liquid level imbalance in the hydrogen and oxygen liquid separator in the water electrolysis device and improve the operating stability and safety of the water electrolysis device, it is necessary to develop a new control system with active adjustment of the liquid level of the hydrogen and oxygen liquid separator to solve the problem of liquid level imbalance and improve the operating stability and safety of the water electrolysis device, which has important practical significance and application value. This patent is proposed in this context, aiming to solve the above problems through technological innovation and provide new solutions for the development of water electrolysis hydrogen production technology. Summary of the invention

[0008] The present invention aims to address the deficiencies in the prior art and to provide a hydrogen and oxygen liquid level rapid stabilization system for hydrogen production by electrolysis of water and a control method thereof, so as to solve the problem of liquid level imbalance in a hydrogen and oxygen liquid separator caused by different response speeds of hydrogen and oxygen production rates to fluctuations in production electric power.

[0009] To achieve the above-mentioned purpose, the present invention adopts a chain loop, coupling an oxygen side liquid level gauge, a hydrogen side liquid level gauge, an oxygen pressure storage tank, a hydrogen pressure storage tank, an oxygen pressure regulating valve and a hydrogen pressure regulating valve, and the chain loop can realize the rapid stabilization of the hydrogen and oxygen liquid levels. When the oxygen side liquid level gauge and the hydrogen side liquid level gauge show that the liquid levels of the oxygen liquid separator and the hydrogen liquid separator are unbalanced, if the hydrogen side liquid level is higher than the oxygen side liquid level, the chain loop releases the hydrogen in the hydrogen pressure storage tank by adjusting the hydrogen pressure regulating valve, thereby reducing the oxygen side liquid level; if the oxygen side liquid level is higher than the hydrogen side liquid level, the chain loop releases the hydrogen in the oxygen pressure storage tank by adjusting the oxygen pressure regulating valve, thereby reducing the oxygen side liquid level.

[0010] The present invention provides a rapid liquid level stabilization system for hydrogen production by water electrolysis. The water electrolysis device includes: a water electrolysis component, and the water electrolysis component includes an electrolytic cell, a gas-liquid separator, a circulation pump, a hydrogen pressure storage tank, and an oxygen pressure storage tank. Alkali liquid is provided to the equipment by pipeline 23, and the alkali liquid is circulated by the circulation pump. The electrolytic cell electrolyzes to produce hydrogen and oxygen. The hydrogen pressure storage tank and the oxygen pressure storage tank can achieve rapid stabilization of the hydrogen and oxygen liquid levels by releasing the stored gas. The technical solution provided by the present application can solve the problems of hydrogen-oxygen interpenetration and slow hydrogen-oxygen liquid level response speed in the water electrolysis device in the prior art. The technical solution of the present invention is as follows:

[0011] The first aspect of the present invention provides a water electrolysis device with a hydrogen-oxygen liquid level stabilization system, the water electrolysis device comprising: an electrolytic cell 16, an oxygen-liquid separator assembly, a hydrogen-gas-liquid separator assembly, a chain loop 3, a hydrogen-side alkali liquid circulation assembly, a hydrogen-side alkali liquid circulation assembly, an oxygen-side alkali liquid circulation assembly, an alkali supplement assembly, and a nitrogen charging assembly;

[0012] The oxygen-liquid separator assembly includes an oxygen-liquid separator 1, an oxygen-side liquid level gauge 2, an oxygen discharge pipe 4, and an oxygen pressure storage tank 5;

[0013] The hydrogen gas-liquid separator assembly includes a hydrogen pressure storage tank 8, a hydrogen discharge pipe 9, a hydrogen side liquid level gauge 10, and a hydrogen gas-liquid separator 11;

[0014] The hydrogen side alkali liquid circulation component includes a first hydrogen side alkali liquid circulation pipeline 12, a hydrogen side heat exchanger 14, a second hydrogen side alkali liquid circulation pipeline 15, a hydrogen side alkali liquid circulation pump 22, and a third hydrogen side alkali liquid circulation pipeline 31;

[0015] The oxygen side alkali liquid circulation component includes a second oxygen side alkali liquid circulation pipeline 17, an oxygen side heat exchanger 18, a first oxygen side alkali liquid circulation pipeline 20, an oxygen side alkali liquid circulation pump 21, and a third oxygen side alkali liquid circulation pipeline 30;

[0016] The alkali replenishment assembly includes an alkali replenishment pipeline 23, a first ball valve 24, a hydrogen-oxygen separator connecting pipeline 25, and a second ball valve 26;

[0017] The nitrogen charging assembly includes a nitrogen charging pipeline 27, a third ball valve 28, and a check valve 29;

[0018] The connection relationship of the above components is as follows:

[0019] The oxygen side liquid level meter 2 is connected to the oxygen-liquid separator 1 to display the liquid level of the oxygen-liquid separator 1; the oxygen pressure storage tank 5 is connected to the oxygen-liquid separator 1 through a pipeline;

[0020] The hydrogen side liquid level gauge 10 is connected to the hydrogen gas-liquid separator 11 and is used to display the liquid level of the hydrogen gas-liquid separator 11; the hydrogen pressure storage tank 8 is connected to the hydrogen gas-liquid separator 11 through a pipeline;

[0021] The interlocking loop 3 controls the liquid level in the oxygen liquid separator 1 and the hydrogen liquid separator 11 to be stable by releasing the oxygen in the oxygen pressure storage tank 5 or the hydrogen in the hydrogen pressure storage tank 8 respectively;

[0022] The first hydrogen-side alkali liquid circulation pipeline 12 is respectively connected with the hydrogen gas-liquid separator 11 and the hydrogen-side heat exchanger 14, and is used for conveying alkali liquid from the hydrogen gas-liquid separator 11 to the hydrogen-side heat exchanger 14, and the hydrogen-side alkali liquid circulation pump 22 is located on the first hydrogen-side alkali liquid circulation pipeline 12; the second hydrogen-side alkali liquid circulation pipeline 15 is respectively connected with the hydrogen-side heat exchanger 14 and the electrolyzer 16, and is used for conveying alkali liquid from the hydrogen-side heat exchanger 14 to the electrolyzer 16; the third hydrogen-side alkali liquid circulation pipeline 31 is respectively connected with the electrolyzer 16 and the hydrogen gas-liquid separator 11, and is used for conveying alkali liquid from the electrolyzer 16 to the hydrogen gas-liquid separator 11;

[0023] The first oxygen-side alkali liquid circulation pipeline 20 is respectively connected with the oxygen-liquid separator 1 and the oxygen-side heat exchanger 18, and is used for conveying alkali liquid from the oxygen-liquid separator 1 to the oxygen-side heat exchanger 18. The oxygen-side alkali liquid circulation pump 21 is located on the first oxygen-side alkali liquid circulation pipeline 20; the second oxygen-side alkali liquid circulation pipeline 17 is respectively connected with the oxygen-side heat exchanger 18 and the electrolytic cell 16, and is used for conveying alkali liquid from the oxygen-side heat exchanger 18 to the electrolytic cell 16; the third oxygen-side alkali liquid circulation pipeline 30 is respectively connected with the electrolytic cell 16 and the oxygen-liquid separator 1, and is used for conveying alkali liquid from the electrolytic cell 16 to the oxygen-liquid separator 1;

[0024] The first ball valve 24 is located on the alkali replenishment pipeline 23, and the second ball valve 26 is located on the hydrogen-oxygen separator connecting pipeline 25;

[0025] The third ball valve 28 and the check valve 29 are both located on the nitrogen filling pipeline 27;

[0026] The hydrogen-oxygen separator connecting pipeline 25 is respectively connected to the oxygen-liquid separator 1 and the hydrogen-gas-liquid separator 11 , and the alkali replenishing pipeline and the nitrogen filling pipeline are both connected to the hydrogen-oxygen separator connecting pipeline 25 .

[0027] Preferably, the first ball valve 24 controls the opening and closing of the alkali replenishment pipeline 23 to realize the addition of alkali solution to the equipment.

[0028] Preferably, the second ball valve 26 controls the opening and closing of the hydrogen-oxygen separator connecting pipeline 25 to avoid cross-talk between hydrogen and oxygen.

[0029] Preferably, the electrolytic cell 16 has a hydrogen outlet and an oxygen outlet, and the oxygen generated at the oxygen outlet enters the oxygen-liquid separator 1 through the oxygen-side alkali liquid circulation pipeline 30 to complete gas-liquid separation; the hydrogen generated at the hydrogen outlet enters the hydrogen-gas-liquid separator 11 through the hydrogen-side alkali liquid circulation pipeline 31 to complete gas-liquid separation.

[0030] Preferably, the oxygen-liquid separator assembly further comprises the oxygen exhaust pipe 4, which is located on the oxygen-liquid separator 1 and is used to exhaust the oxygen in the oxygen-liquid separator 1;

[0031] The hydrogen gas-liquid separator assembly further includes the hydrogen discharge pipe 9 , which is located on the hydrogen gas-liquid separator 11 and is used to discharge the hydrogen in the hydrogen gas-liquid separator 11 .

[0032] Preferably, the hydrogen side alkali liquid circulation component further comprises a hydrogen side cooling circulation pipeline 13, and the hydrogen side cooling circulation pipeline 13 is connected to the hydrogen side heat exchanger 14, and is used to reduce the temperature of the alkali liquid in the hydrogen side heat exchanger 14;

[0033] The oxygen-side alkali liquid circulation component further includes an oxygen-side cooling circulation pipeline 19 , which is connected to the oxygen-side heat exchanger 18 and is used to reduce the temperature of the alkali liquid in the oxygen-side heat exchanger 18 .

[0034] Preferably, the oxygen pressure storage tank 5 is equipped with an oxygen pressure regulating valve 6, and the release of oxygen in the oxygen pressure storage tank 5 is controlled by the oxygen pressure regulating valve 6;

[0035] The hydrogen pressure storage tank 8 is equipped with a hydrogen pressure regulating valve 7, and the release of hydrogen in the hydrogen pressure storage tank 8 is controlled by the hydrogen pressure regulating valve 7;

[0036] The interlocking loop 3 controls the liquid levels in the oxygen-liquid separator 1 and the hydrogen-gas-liquid separator 11 by releasing the oxygen in the oxygen pressure storage tank 5 to the oxygen-liquid separator 1 or releasing the hydrogen in the hydrogen pressure storage tank 8 to the hydrogen-gas-liquid separator 11.

[0037] The second aspect of the present invention provides a control method for the water electrolysis device according to the first aspect of the present invention, comprising the following steps:

[0038] Open the first ball valve 24 and the second ball valve 26, and introduce alkali solution into the water electrolysis device through the alkali supply pipeline 23. After the liquid levels of the oxygen level separator 1 and the hydrogen level separator 11 reach the set value, close the first ball valve 24 and the second ball valve 26;

[0039] The oxygen-side alkali liquid circulation pump 21 and the hydrogen-side alkali liquid circulation pump 22 are started, and the alkali liquid in the oxygen-liquid separator 1 flows into the electrolyzer 16 through the first oxygen-side alkali liquid circulation pipeline 20, the oxygen-side heat exchanger 18 and the second oxygen-side alkali liquid circulation pipeline 17; the alkali liquid in the hydrogen-gas-liquid separator 11 flows into the electrolyzer 16 through the first hydrogen-side alkali liquid circulation pipeline 12, the hydrogen-side heat exchanger 14 and the second hydrogen-side alkali liquid circulation pipeline 15; the alkali liquid enters the double circulation pipeline, the alkali liquid starts to circulate, and the DC power supply is started at the same time, the electrolyzer 16 starts to work, and hydrogen and oxygen are generated. The hydrogen flows into the hydrogen liquid level separator 11 through the third hydrogen-side alkali liquid circulation pipeline 31 along with the alkali liquid, and the oxygen flows into the oxygen liquid level separator 1 through the third oxygen-side alkali liquid circulation pipeline 30 along with the alkali liquid;

[0040] When the oxygen side liquid level gauge 2 and the hydrogen side liquid level gauge 10 show that the liquid levels of the oxygen-liquid separator 1 and the hydrogen-gas-liquid separator 11 are unbalanced, the interlocking loop 3 is started to control the liquid levels in the oxygen-liquid separator 1 and the hydrogen-gas-liquid separator 11 to be stable by releasing the oxygen in the oxygen pressure storage tank 5 or the hydrogen in the hydrogen pressure storage tank 8.

[0041] Preferably, the stabilization of the hydrogen and oxygen liquid levels is achieved through the interlocking loop 3;

[0042] When the oxygen side liquid level meter 2 and the hydrogen side liquid level meter 10 show that the liquid levels of the oxygen-liquid separator 1 and the hydrogen-liquid separator 11 are unbalanced, if the hydrogen side liquid level is higher than the oxygen side liquid level, the interlocking loop 3 releases the hydrogen in the hydrogen pressure storage tank 8 by adjusting the hydrogen pressure regulating valve 7, thereby lowering the oxygen side liquid level; if the oxygen side liquid level is higher than the hydrogen side liquid level, the interlocking loop 3 releases the oxygen in the oxygen pressure storage tank 5 by adjusting the oxygen pressure regulating valve 6, thereby lowering the oxygen side liquid level.

[0043] A third aspect of the present invention provides a hydrogen production device, which includes the water electrolysis device described in the first aspect of the present invention.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention adopts a chain loop, coupling an oxygen side liquid level gauge, a hydrogen side liquid level gauge, an oxygen pressure storage tank, a hydrogen pressure storage tank, an oxygen pressure regulating valve and a hydrogen pressure regulating valve, to quickly adjust the hydrogen and oxygen liquid levels, thereby achieving a rapid balance of the hydrogen and oxygen liquid levels, thereby avoiding damage to the water electrolysis equipment caused by excessive hydrogen and oxygen liquid level differences. Specifically, when the oxygen side liquid level gauge and the hydrogen side liquid level gauge in the system of the present invention show that the liquid levels of the oxygen liquid separator and the hydrogen liquid separator are unbalanced, if the hydrogen side liquid level is higher than the oxygen side liquid level, the chain loop releases the hydrogen in the hydrogen pressure storage tank by adjusting the hydrogen pressure regulating valve, thereby reducing the oxygen side liquid level; if the oxygen side liquid level is higher than the hydrogen side liquid level, the chain loop releases the hydrogen in the oxygen pressure storage tank by adjusting the oxygen pressure regulating valve, thereby reducing the oxygen side liquid level. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The present invention is a process flow chart of a rapid liquid level stabilization system for producing hydrogen by water electrolysis.

[0047] The names of the accompanying drawings in the accompanying drawings are as follows: 1. oxygen-liquid separator; 2. oxygen-side liquid level gauge; 3. interlocking loop; 4. oxygen discharge pipe; 5. oxygen pressure storage tank; 6. oxygen pressure regulating valve; 7. hydrogen pressure regulating valve; 8. hydrogen pressure storage tank; 9. hydrogen discharge pipe; 10. hydrogen-side liquid level gauge; 11. hydrogen-liquid separator; 12. first hydrogen-side alkali liquid circulation pipeline; 13. hydrogen-side cooling circulation pipeline; 14. hydrogen-side heat exchanger; 15. second hydrogen-side alkali liquid circulation pipeline; 16. Electrolyzer; 17, second oxygen side alkali liquid circulation pipeline; 18, oxygen side heat exchanger; 19, oxygen side cooling circulation pipeline; 20, first oxygen side alkali liquid circulation pipeline; 21, oxygen side alkali liquid circulation pump; 22, hydrogen side alkali liquid circulation pump; 23, alkali replenishment pipeline; 24, first ball valve; 25, hydrogen and oxygen separator connecting pipeline; 26, second ball valve; 27, nitrogen filling pipeline; 28, third ball valve; 29, check valve; 30, third oxygen side alkali liquid circulation pipeline; 31, third hydrogen side alkali liquid circulation pipeline. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with embodiments.

[0049] Those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product specifications are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0050] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used herein may include wireless connections.

[0051] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two. The terms "inside", "upper", "lower", etc., indicating positions or state relationships, are based on the positions or state relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting the present invention.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0053] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0054] Example

[0055] like Figure 1 As shown, this embodiment is a water electrolysis device with a hydrogen-oxygen liquid level stabilization system, and the water electrolysis device includes: an electrolytic cell 16, an oxygen-liquid separator component, a hydrogen-gas-liquid separator component, a chain loop 3, a hydrogen-side alkali liquid circulation component, a hydrogen-side alkali liquid circulation component, an oxygen-side alkali liquid circulation component, an alkali supplement component, and a nitrogen charging component;

[0056] The oxygen-liquid separator assembly includes an oxygen-liquid separator 1, an oxygen-side liquid level gauge 2, an oxygen discharge pipe 4, and an oxygen pressure storage tank 5;

[0057] The hydrogen gas-liquid separator assembly includes a hydrogen pressure storage tank 8, a hydrogen discharge pipe 9, a hydrogen side liquid level gauge 10, and a hydrogen gas-liquid separator 11;

[0058] The hydrogen side alkali liquid circulation component includes a first hydrogen side alkali liquid circulation pipeline 12, a hydrogen side heat exchanger 14, a second hydrogen side alkali liquid circulation pipeline 15, a hydrogen side alkali liquid circulation pump 22, and a third hydrogen side alkali liquid circulation pipeline 31;

[0059] The oxygen side alkali liquid circulation component includes a second oxygen side alkali liquid circulation pipeline 17, an oxygen side heat exchanger 18, a first oxygen side alkali liquid circulation pipeline 20, an oxygen side alkali liquid circulation pump 21, and a third oxygen side alkali liquid circulation pipeline 30;

[0060] The alkali replenishment assembly includes an alkali replenishment pipeline 23, a first ball valve 24, a hydrogen-oxygen separator connecting pipeline 25, and a second ball valve 26;

[0061] The nitrogen charging assembly includes a nitrogen charging pipeline 27, a third ball valve 28, and a check valve 29;

[0062] The connection relationship of the above components is as follows:

[0063] The oxygen side liquid level meter 2 is connected to the oxygen-liquid separator 1 to display the liquid level of the oxygen-liquid separator 1; the oxygen pressure storage tank 5 is connected to the oxygen-liquid separator 1 through a pipeline;

[0064] The hydrogen side liquid level gauge 10 is connected to the hydrogen gas-liquid separator 11 and is used to display the liquid level of the hydrogen gas-liquid separator 11; the hydrogen pressure storage tank 8 is connected to the hydrogen gas-liquid separator 11 through a pipeline;

[0065] The interlocking loop 3 controls the liquid level in the oxygen liquid separator 1 and the hydrogen liquid separator 11 to be stable by releasing the oxygen in the oxygen pressure storage tank 5 or the hydrogen in the hydrogen pressure storage tank 8 respectively;

[0066] The first hydrogen-side alkali liquid circulation pipeline 12 is respectively connected with the hydrogen gas-liquid separator 11 and the hydrogen-side heat exchanger 14, and is used for conveying alkali liquid from the hydrogen gas-liquid separator 11 to the hydrogen-side heat exchanger 14, and the hydrogen-side alkali liquid circulation pump 22 is located on the first hydrogen-side alkali liquid circulation pipeline 12; the second hydrogen-side alkali liquid circulation pipeline 15 is respectively connected with the hydrogen-side heat exchanger 14 and the electrolyzer 16, and is used for conveying alkali liquid from the hydrogen-side heat exchanger 14 to the electrolyzer 16; the third hydrogen-side alkali liquid circulation pipeline 31 is respectively connected with the electrolyzer 16 and the hydrogen gas-liquid separator 11, and is used for conveying alkali liquid from the electrolyzer 16 to the hydrogen gas-liquid separator 11;

[0067] The first oxygen-side alkali liquid circulation pipeline 20 is respectively connected with the oxygen-liquid separator 1 and the oxygen-side heat exchanger 18, and is used for conveying alkali liquid from the oxygen-liquid separator 1 to the oxygen-side heat exchanger 18. The oxygen-side alkali liquid circulation pump 21 is located on the first oxygen-side alkali liquid circulation pipeline 20; the second oxygen-side alkali liquid circulation pipeline 17 is respectively connected with the oxygen-side heat exchanger 18 and the electrolytic cell 16, and is used for conveying alkali liquid from the oxygen-side heat exchanger 18 to the electrolytic cell 16; the third oxygen-side alkali liquid circulation pipeline 30 is respectively connected with the electrolytic cell 16 and the oxygen-liquid separator 1, and is used for conveying alkali liquid from the electrolytic cell 16 to the oxygen-liquid separator 1;

[0068] The first ball valve 24 is located on the alkali replenishment pipeline 23, and the second ball valve 26 is located on the hydrogen-oxygen separator connecting pipeline 25;

[0069] The third ball valve 28 and the check valve 29 are both located on the nitrogen filling pipeline 27;

[0070] The hydrogen-oxygen separator connecting pipeline 25 is respectively connected to the oxygen-liquid separator 1 and the hydrogen-gas-liquid separator 11 , and the alkali replenishing pipeline and the nitrogen filling pipeline are both connected to the hydrogen-oxygen separator connecting pipeline 25 .

[0071] The first ball valve 24 controls the opening and closing of the alkali replenishment pipeline 23 to realize the addition of alkali solution to the equipment.

[0072] The second ball valve 26 controls the opening and closing of the hydrogen-oxygen separator connecting pipeline 25 to prevent hydrogen and oxygen from flowing into each other.

[0073] The electrolytic cell 16 has a hydrogen outlet and an oxygen outlet. The oxygen generated at the oxygen outlet enters the oxygen-liquid separator 1 through the oxygen-side alkali liquid circulation pipeline 30 to complete gas-liquid separation; the hydrogen generated at the hydrogen outlet enters the hydrogen-gas-liquid separator 11 through the hydrogen-side alkali liquid circulation pipeline 31 to complete gas-liquid separation.

[0074] The oxygen-liquid separator assembly further comprises the oxygen exhaust pipe 4, which is located on the oxygen-liquid separator 1 and is used to exhaust the oxygen in the oxygen-liquid separator 1;

[0075] The hydrogen gas-liquid separator assembly further includes the hydrogen discharge pipe 9 , which is located on the hydrogen gas-liquid separator 11 and is used to discharge the hydrogen in the hydrogen gas-liquid separator 11 .

[0076] The hydrogen side alkali liquid circulation component further includes a hydrogen side cooling circulation pipeline 13, and the hydrogen side cooling circulation pipeline 13 is connected to the hydrogen side heat exchanger 14, and is used to reduce the temperature of the alkali liquid in the hydrogen side heat exchanger 14;

[0077] The oxygen-side alkali liquid circulation component further includes an oxygen-side cooling circulation pipeline 19 , which is connected to the oxygen-side heat exchanger 18 and is used to reduce the temperature of the alkali liquid in the oxygen-side heat exchanger 18 .

[0078] The oxygen pressure storage tank 5 is equipped with an oxygen pressure regulating valve 6, and the release of oxygen in the oxygen pressure storage tank 5 is controlled by the oxygen pressure regulating valve 6;

[0079] The hydrogen pressure storage tank 8 is equipped with a hydrogen pressure regulating valve 7, and the release of hydrogen in the hydrogen pressure storage tank 8 is controlled by the hydrogen pressure regulating valve 7;

[0080] The interlocking loop 3 controls the liquid levels in the oxygen-liquid separator 1 and the hydrogen-gas-liquid separator 11 by releasing the oxygen in the oxygen pressure storage tank 5 to the oxygen-liquid separator 1 or releasing the hydrogen in the hydrogen pressure storage tank 8 to the hydrogen-gas-liquid separator 11.

[0081] The control method of the water electrolysis device comprises the following steps:

[0082] Open the first ball valve 24 and the second ball valve 26, and introduce alkali solution into the water electrolysis device through the alkali supply pipeline 23. After the liquid levels of the oxygen level separator 1 and the hydrogen level separator 11 reach the set value, close the first ball valve 24 and the second ball valve 26;

[0083] The oxygen-side alkali liquid circulation pump 21 and the hydrogen-side alkali liquid circulation pump 22 are started, and the alkali liquid in the oxygen-liquid separator 1 flows into the electrolyzer 16 through the first oxygen-side alkali liquid circulation pipeline 20, the oxygen-side heat exchanger 18 and the second oxygen-side alkali liquid circulation pipeline 17; the alkali liquid in the hydrogen-gas-liquid separator 11 flows into the electrolyzer 16 through the first hydrogen-side alkali liquid circulation pipeline 12, the hydrogen-side heat exchanger 14 and the second hydrogen-side alkali liquid circulation pipeline 15; the alkali liquid enters the double circulation pipeline, the alkali liquid starts to circulate, and the DC power supply is started at the same time, the electrolyzer 16 starts to work, and hydrogen and oxygen are generated. The hydrogen flows into the hydrogen liquid level separator 11 through the third hydrogen-side alkali liquid circulation pipeline 31 along with the alkali liquid, and the oxygen flows into the oxygen liquid level separator 1 through the third oxygen-side alkali liquid circulation pipeline 30 along with the alkali liquid;

[0084] When the oxygen side liquid level gauge 2 and the hydrogen side liquid level gauge 10 show that the liquid levels of the oxygen-liquid separator 1 and the hydrogen-gas-liquid separator 11 are unbalanced, the interlocking loop 3 is started to control the liquid levels in the oxygen-liquid separator 1 and the hydrogen-gas-liquid separator 11 to be stable by releasing the oxygen in the oxygen pressure storage tank 5 or the hydrogen in the hydrogen pressure storage tank 8.

[0085] The hydrogen and oxygen liquid levels are stabilized by the interlocking loop 3;

[0086] When the oxygen side liquid level meter 2 and the hydrogen side liquid level meter 10 show that the liquid levels of the oxygen-liquid separator 1 and the hydrogen-liquid separator 11 are unbalanced, if the hydrogen side liquid level is higher than the oxygen side liquid level, the interlocking loop 3 releases the hydrogen in the hydrogen pressure storage tank 8 by adjusting the hydrogen pressure regulating valve 7, thereby lowering the oxygen side liquid level; if the oxygen side liquid level is higher than the hydrogen side liquid level, the interlocking loop 3 releases the oxygen in the oxygen pressure storage tank 5 by adjusting the oxygen pressure regulating valve 6, thereby lowering the oxygen side liquid level.

[0087] A hydrogen production device comprises the water electrolysis device described in this embodiment.

[0088] like Figure 1 As shown, the hydrogen pressure storage tank 8 is placed above the hydrogen liquid level separator 11, and the release of hydrogen is controlled by the hydrogen pressure regulating valve 7 to achieve rapid balance of the liquid level.

[0089] like Figure 1 As shown, the oxygen pressure storage tank 5 is placed above the hydrogen liquid level separator 1, and the release of hydrogen is controlled by the oxygen pressure regulating valve 6 to achieve rapid balance of the liquid level.

Claims

1. A water electrolysis device with a hydrogen and oxygen liquid level stabilization system, characterized in that: The water electrolysis device comprises: an electrolytic cell (16), an oxygen liquid separator component, a hydrogen liquid separator component, a chain loop (3), a hydrogen side alkali liquid circulation component, a hydrogen side alkali liquid circulation component, an oxygen side alkali liquid circulation component, an alkali replenishment component and a nitrogen charging component; The oxygen-liquid separator assembly comprises an oxygen-liquid separator (1), an oxygen-side liquid level gauge (2), an oxygen discharge pipe (4), and an oxygen pressure storage tank (5); The hydrogen gas-liquid separator assembly comprises a hydrogen pressure storage tank (8), a hydrogen discharge pipe (9), a hydrogen side liquid level gauge (10), and a hydrogen gas-liquid separator (11); The hydrogen side alkali liquid circulation component comprises a first hydrogen side alkali liquid circulation pipeline (12), a hydrogen side heat exchanger (14), a second hydrogen side alkali liquid circulation pipeline (15), a hydrogen side alkali liquid circulation pump (22), and a third hydrogen side alkali liquid circulation pipeline (31); The oxygen-side alkali liquid circulation component comprises a second oxygen-side alkali liquid circulation pipeline (17), an oxygen-side heat exchanger (18), a first oxygen-side alkali liquid circulation pipeline (20), an oxygen-side alkali liquid circulation pump (21), and a third oxygen-side alkali liquid circulation pipeline (30); The alkali replenishing assembly comprises an alkali replenishing pipeline (23), a first ball valve (24), a hydrogen-oxygen separator connecting pipeline (25), and a second ball valve (26); The nitrogen charging assembly comprises a nitrogen charging pipeline (27), a third ball valve (28), and a check valve (29); The connection relationship of the above components is as follows: The oxygen side liquid level meter (2) is connected to the oxygen-liquid separator (1) and is used to display the liquid level of the oxygen-liquid separator (1); the oxygen pressure storage tank (5) is connected to the oxygen-liquid separator (1) through a pipeline; The hydrogen side liquid level meter (10) is connected to the hydrogen gas-liquid separator (11) and is used to display the liquid level of the hydrogen gas-liquid separator (11); the hydrogen pressure storage tank (8) is connected to the hydrogen gas-liquid separator (11) through a pipeline; The interlocking circuit (3) controls the liquid levels in the oxygen-liquid separator (1) and the hydrogen-gas-liquid separator (11) to be stable by releasing the oxygen in the oxygen pressure storage tank (5) to the oxygen-liquid separator (1) or releasing the hydrogen in the hydrogen pressure storage tank (8) to the hydrogen-gas-liquid separator (11); The first hydrogen-side alkali liquid circulation pipeline (12) is respectively connected to the hydrogen gas-liquid separator (11) and the hydrogen-side heat exchanger (14), and is used to transport alkali liquid from the hydrogen gas-liquid separator (11) to the hydrogen-side heat exchanger (14); the hydrogen-side alkali liquid circulation pump (22) is located on the first hydrogen-side alkali liquid circulation pipeline (12); the second hydrogen-side alkali liquid circulation pipeline (15) is respectively connected to the hydrogen-side heat exchanger (14) and the electrolyzer (16), and is used to transport alkali liquid from the hydrogen-side heat exchanger (14) to the electrolyzer (16); the third hydrogen-side alkali liquid circulation pipeline (31) is respectively connected to the electrolyzer (16) and the hydrogen gas-liquid separator (11), and is used to transport alkali liquid from the electrolyzer (16) to the hydrogen gas-liquid separator (11); The first oxygen-side alkali liquid circulation pipeline (20) is respectively connected to the oxygen-liquid separator (1) and the oxygen-side heat exchanger (18), and is used for conveying alkali liquid from the oxygen-liquid separator (1) to the oxygen-side heat exchanger (18); the oxygen-side alkali liquid circulation pump (21) is located on the first oxygen-side alkali liquid circulation pipeline (20); the second oxygen-side alkali liquid circulation pipeline (17) is respectively connected to the oxygen-side heat exchanger (18) and the electrolytic cell (16), and is used for conveying alkali liquid from the oxygen-side heat exchanger (18) to the electrolytic cell (16); the third oxygen-side alkali liquid circulation pipeline (30) is respectively connected to the electrolytic cell (16) and the oxygen-liquid separator (1), and is used for conveying alkali liquid from the electrolytic cell (16) to the oxygen-liquid separator (1); The first ball valve (24) is located on the alkali replenishment pipeline (23), and the second ball valve (26) is located on the hydrogen-oxygen separator connecting pipeline (25); The third ball valve (28) and the check valve (29) are both located on the nitrogen filling pipeline (27); The hydrogen-oxygen separator connecting pipeline (25) is respectively connected to the oxygen-liquid separator (1) and the hydrogen-liquid separator (11), and the alkali replenishing pipeline and the nitrogen filling pipeline are both connected to the hydrogen-oxygen separator connecting pipeline (25).

2. The water electrolysis device according to claim 1, characterized in that: The first ball valve (24) controls the opening and closing of the alkali replenishment pipeline (23) to realize the addition of alkali solution to the equipment.

3. The water electrolysis device according to claim 1, characterized in that: The second ball valve (26) controls the opening and closing of the hydrogen-oxygen separator connecting pipeline (25) to prevent hydrogen and oxygen from flowing into each other.

4. The water electrolysis device according to claim 1, characterized in that: The electrolytic cell (16) has a hydrogen outlet and an oxygen outlet. The oxygen generated at the oxygen outlet enters the oxygen-liquid separator (1) through the oxygen-side alkali liquid circulation pipeline (30) to complete gas-liquid separation; the hydrogen generated at the hydrogen outlet enters the hydrogen-gas-liquid separator (11) through the third hydrogen-side alkali liquid circulation pipeline (31) to complete gas-liquid separation.

5. The water electrolysis device according to claim 1, characterized in that: The oxygen-liquid separator assembly further comprises the oxygen discharge pipe (4), wherein the oxygen discharge pipe (4) is located on the oxygen-liquid separator (1) and is used to discharge the oxygen in the oxygen-liquid separator (1); The hydrogen gas-liquid separator assembly further comprises the hydrogen discharge pipe (9), which is located on the hydrogen gas-liquid separator (11) and is used to discharge the hydrogen in the hydrogen gas-liquid separator (11).

6. The water electrolysis device according to claim 5, characterized in that: The hydrogen side alkali liquid circulation component further comprises a hydrogen side cooling circulation pipeline (13), wherein the hydrogen side cooling circulation pipeline (13) is in communication with the hydrogen side heat exchanger (14) and is used to reduce the temperature of the alkali liquid in the hydrogen side heat exchanger (14); The oxygen-side alkali liquid circulation component further comprises an oxygen-side cooling circulation pipeline (19), wherein the oxygen-side cooling circulation pipeline (19) is in communication with the oxygen-side heat exchanger (18) and is used to reduce the temperature of the alkali liquid in the oxygen-side heat exchanger (18).

7. The water electrolysis device according to claim 6, characterized in that: The oxygen pressure storage tank (5) is equipped with an oxygen pressure regulating valve (6), and the release of oxygen in the oxygen pressure storage tank (5) is controlled by the oxygen pressure regulating valve (6); The hydrogen pressure storage tank (8) is equipped with a hydrogen pressure regulating valve (7), and the release of hydrogen in the hydrogen pressure storage tank (8) is controlled by the hydrogen pressure regulating valve (7); The interlocking circuit (3) releases the oxygen in the oxygen pressure storage tank (5) or the hydrogen in the hydrogen pressure storage tank (8) through the oxygen pressure regulating valve (6) or the hydrogen pressure regulating valve (7), respectively, thereby controlling the liquid levels in the oxygen liquid separator (1) and the hydrogen liquid separator (11).

8. A method for controlling a water electrolysis device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Open the first ball valve (24) and the second ball valve (26), and introduce alkali solution into the water electrolysis device through the alkali supply pipeline (23), and after the liquid levels of the (1) oxygen liquid level separator and the (11) hydrogen liquid level separator reach the set value, close the first ball valve (24) and the second ball valve (26); The oxygen-side alkali liquid circulation pump (21) and the hydrogen-side alkali liquid circulation pump (22) are started, and the alkali liquid in the oxygen-liquid separator (1) flows into the electrolyzer (16) through the first oxygen-side alkali liquid circulation pipeline (20), the oxygen-side heat exchanger (18) and the second oxygen-side alkali liquid circulation pipeline (17); the alkali liquid in the hydrogen-gas-liquid separator (11) flows into the electrolyzer (16) through the first hydrogen-side alkali liquid circulation pipeline (12), the hydrogen-side heat exchanger (14) and the second hydrogen-side alkali liquid circulation pipeline (15); the alkali liquid enters the double circulation pipeline, and the alkali liquid starts to circulate. At the same time, the DC power supply is started, and the electrolyzer (16) starts to work to generate hydrogen and oxygen. The hydrogen flows into the hydrogen liquid level separator (11) along with the alkali liquid through the third hydrogen-side alkali liquid circulation pipeline (31), and the oxygen flows into the oxygen liquid level separator (1) along with the alkali liquid through the third oxygen-side alkali liquid circulation pipeline (30); When the oxygen-side liquid level gauge (2) and the hydrogen-side liquid level gauge (10) indicate that the liquid levels of the oxygen-liquid separator (1) and the hydrogen-gas-liquid separator (11) are unbalanced, the interlocking circuit (3) is activated to control the liquid levels in the oxygen-liquid separator (1) and the hydrogen-gas-liquid separator (11) to be stable by releasing the oxygen in the oxygen pressure storage tank (5) or the hydrogen in the hydrogen pressure storage tank (8).

9. The control method according to claim 8, characterized in that: The hydrogen and oxygen liquid levels are stabilized by the interlocking circuit (3); When the oxygen side liquid level meter (2) and the hydrogen side liquid level meter (10) show that the liquid levels of the oxygen liquid separator (1) and the hydrogen liquid separator (11) are unbalanced, if the hydrogen side liquid level is higher than the oxygen side liquid level, the interlocking circuit (3) releases the hydrogen in the hydrogen pressure storage tank (8) by adjusting the hydrogen pressure regulating valve (7), thereby lowering the oxygen side liquid level; if the oxygen side liquid level is higher than the hydrogen side liquid level, the interlocking circuit (3) releases the oxygen in the oxygen pressure storage tank (5) by adjusting the oxygen pressure regulating valve (6), thereby lowering the oxygen side liquid level.

10. A hydrogen production device, characterized in that: The hydrogen production equipment comprises the water electrolysis device according to any one of claims 1-7.

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