Alkali liquor mutual heating energy-saving system of alkaline water electrolysis hydrogen production device and use method thereof

Abstract

The invention provides an alkali liquor mutual heating energy-saving system of an alkali water electrolysis hydrogen production device and a use method. The alkali liquor mutual heating energy-saving system comprises a plurality of alkali liquor mutual heating energy-saving subsystems, each alkali liquor mutual heating energy-saving subsystem comprises a hydrogen-oxygen separation unit, an electrolytic cell, an alkali liquor heat exchanger, an alkali liquor isolation valve, an alkali liquor mutual heating communication pipeline first automatic valve, an alkali liquor mutual heating communication pipeline first manual valve, an alkali liquor filter first automatic valve, an alkali liquor filter first manual valve and an alkali liquor filter second automatic valve; an alkali liquor filter second manual valve, an alkali liquor mutual-heating communicating pipeline second automatic valve, an alkali liquor mutual-heating communicating pipeline second manual valve and an alkali liquor circulating pump are arranged on the base. According to the system, heat exchange is carried out on low-temperature alkali liquor in the standby electrolytic bath which is stopped or powered off and high-temperature alkali liquor in the running electrolytic bath, so that the low-temperature alkali liquor is heated, electric energy consumed by heating of the low-temperature alkali liquor is reduced, and it is guaranteed that the temperature of the alkali liquor in the running electrolytic bath is within a safe range; and the safety of the system is improved.

Description

Technical Field

[0001] The invention belongs to the field of new energy power generation and hydrogen production, and specifically belongs to an alkaline water electrolysis hydrogen production device alkali liquid mutual heating energy-saving system and a use method thereof. Background Art

[0002] With the continuous growth of new energy power generation, the new energy power generation hydrogen production market has shown great development potential. On the one hand, new energy power generation hydrogen production can be used as hydrogen energy storage, and new energy power generation can be used for water electrolysis hydrogen production. After storage, hydrogen can be used in chemical production, hydrogen metallurgy, or transportation fields; on the other hand, new energy power generation hydrogen production, as a renewable energy hydrogen production method, can replace traditional fossil energy hydrogen production, reduce traditional energy consumption, and reduce carbon dioxide emissions. At this stage, the use of new energy power generation for water electrolysis hydrogen production projects has the characteristics of many projects and large scale.

[0003] In the hydrogen production by renewable energy power generation, alkaline water electrolysis hydrogen production technology is currently the most mature water electrolysis hydrogen production method. Specifically, water is electrolyzed by cooperating with an electrolyzer and a hydrogen-oxygen separation unit. This method has the advantages of simple cell structure, safety and reliability, long service life, easy operation, and low price. It is the main water electrolysis hydrogen production method on the market. Then in this technology, due to the intermittent, unstable and volatile nature of new energy power generation, when new energy electricity provides electricity for water electrolysis hydrogen production, during the period of low-load power supply of new energy, some electrolyzers of its supporting water electrolysis hydrogen production project need to be shut down or powered off. When the power supply load increases, the hydrogen production equipment will be put into hydrogen production again. After the electrolyzer is shut down or powered off, the temperature of the alkali solution in it gradually decreases with the increase of time. Therefore, in the process of hydrogen production by electrolyzer, it takes a certain amount of time for the electrolyzer that is shut down or powered off to increase the temperature of the alkali solution in it. When the alkali solution temperature reaches above 80°C, it can reach the rated working condition to produce hydrogen, which makes the time for the electrolyzer that is shut down or powered off to start again long, and it needs to use a certain amount of electricity, which leads to the low efficiency of new energy electricity for water electrolysis hydrogen production. At the same time, for the electrolyzer that is in operation, a large amount of heat will be generated, and the cooling water system needs to be operated to maintain the temperature of the electrolysis hydrogen production system to prevent the alkali solution temperature from being too high, making the cost of new energy power generation hydrogen production high. Summary of the invention

[0004] In order to solve the problem that in the existing renewable energy power generation and hydrogen production process, a certain amount of electric energy is required to restart an electrolyzer that has been stopped or on standby due to a power outage, while a running electrolyzer will generate a large amount of heat, and a cooling water system needs to be operated for cooling, resulting in a waste of heat energy and high cost of renewable energy power generation and hydrogen production, the present invention provides an alkaline water electrolysis hydrogen production device alkaline liquid mutual heating energy-saving system and a use method thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions: The present invention proposes an alkali solution mutual heating energy-saving system for an alkaline water electrolysis hydrogen production device, comprising a plurality of alkali solution mutual heating energy-saving subsystems, each of which comprises a hydrogen-oxygen separation unit, an electrolytic cell, an alkali solution heat exchanger, an alkali solution isolation valve, a first automatic valve of an alkali solution mutual heating connecting pipeline, a first manual valve of an alkali solution mutual heating connecting pipeline, a first manual valve of an alkali solution filter, a second manual valve of an alkali solution filter, a second manual valve of an alkali solution mutual heating connecting pipeline, and an alkali solution circulation pump; The liquid outlet of the hydrogen-oxygen separation unit is connected to the first input interface of the alkali liquid heat exchanger through a pipeline, the first output interface of the alkali liquid heat exchanger is connected to the input end interface of the alkali liquid isolation valve, the output end interface of the alkali liquid isolation valve is connected to the liquid inlet of the alkali liquid circulation pump, and the liquid outlet of the alkali liquid circulation pump is connected to the liquid inlet of the electrolyzer; The second interface on the alkali liquid heat exchanger located on the same side as the first input interface is connected to an interface at one end of the manual valve of the alkali liquid filter; the third interface on the alkali liquid heat exchanger located on the same side as the first output interface is connected to an interface at one end of the second manual valve of the alkali liquid filter, and the other end interface of the second manual valve of the alkali liquid filter is connected to an interface at one end of the first manual valve of the alkali liquid mutual heating connecting pipeline; the other end interface of the first manual valve of the alkali liquid mutual heating connecting pipeline is connected to the input end interface of the alkali liquid isolation valve, and the output end interface of the alkali liquid isolation valve is connected to the liquid inlet of the alkali liquid circulation pump through a branch pipeline. The other end interface of the second manual valve of the alkali liquid mutual heating connecting pipeline and the other end interface of the manual valve of the alkali liquid filter are connected to one end interface of the manual valve of the alkali liquid mutual heating connecting pipeline in other alkali liquid mutual heating energy-saving subsystems away from the alkali liquid isolation valve and the other end interface of the manual valve of the alkali liquid filter away from the alkali liquid heat exchanger. The pipeline connecting the second manual valve of the alkali liquid filter and the first manual valve of the alkali liquid mutual heating connecting pipeline in one of the alkali liquid mutual heating energy-saving subsystems is connected to the pipeline connecting the second manual valve of the alkali liquid filter and the first manual valve of the alkali liquid mutual heating connecting pipeline in other alkali liquid mutual heating energy-saving subsystems through the alkali liquid mutual heating connecting alkali inlet main pipe.

[0006] Preferably, the hydrogen-oxygen separation unit is connected to a demineralized water supplement source via a pipeline.

[0007] Preferably, a cooling water heat exchanger is connected between the liquid outlet of the alkali solution circulation pump and the liquid inlet of the electrolytic cell, and the cooling water heat exchanger is connected to a cooling water source through a pipeline.

[0008] Preferably, an alkali replenishment pipe is connected to the pipeline connecting the liquid inlet of the alkali liquid circulation pump and the alkali liquid isolation valve, and an alkali return pipe is connected to the pipeline connecting the liquid outlet of the alkali liquid circulation pump and the cooling water heat exchanger, and the alkali replenishment pipe and the alkali return pipe are connected to an alkali liquid source.

[0009] Preferably, an alkali solution filter is provided on the pipeline connecting the liquid outlet of the alkali solution circulation pump and the cooling water heat exchanger at a position between the liquid outlet of the alkali solution circulation pump and the alkali return pipe.

[0010] Preferably, the alkali solution filter is one or more of a PPH alloy one-piece bag filter, a polypropylene PP single-layer filter, a stainless steel filter element filter and a pure PP polypropylene filter.

[0011] Preferably, the electrolytic cell is connected to an electrolytic cell power supply and distribution system via wires, and the electrolytic cell power supply and distribution system includes a rectifier transformer and a DC rectifier cabinet, the rectifier transformer wires connect the external wall power supply and the DC rectifier cabinet, and the DC rectifier cabinet wires connect the electrolytic cell.

[0012] Preferably, a first automatic valve of the alkali liquid filter is provided on the pipeline connecting the alkali liquid heat exchanger and the first manual valve of the alkali liquid filter, and a second automatic valve of the alkali liquid filter is provided on the pipeline connecting the alkali liquid heat exchanger and the second manual valve of the alkali liquid filter.

[0013] Preferably, a first automatic valve of the alkali solution mutual heating connecting pipeline is provided on the pipeline connecting the first manual valve of the alkali solution mutual heating connecting pipeline and the alkali solution isolation valve; The branch pipeline is provided with a second automatic valve of the alkali solution mutual heating connecting pipeline.

[0014] The present invention also proposes a method for using the alkaline water electrolysis hydrogen production device alkali solution mutual heat energy-saving system, which is used to control the above system, comprising the following steps: Step 1, obtaining the alkali liquid temperatures in multiple alkali liquid mutual heat energy-saving subsystems, determining that the alkali liquid mutual heat energy-saving subsystem corresponding to the highest alkali liquid temperature is the heat output subsystem, and the other alkali liquid mutual heat energy-saving subsystems are the heat input subsystems; Step 2, opening the first automatic valve of the alkali liquid filter, the first manual valve of the alkali liquid filter, the second automatic valve of the alkali liquid filter and the second manual valve of the alkali liquid filter of the heat output subsystem, and keeping the first automatic valve of the alkali liquid mutual heating connecting pipeline, the first manual valve of the alkali liquid mutual heating connecting pipeline, the second automatic valve of the alkali liquid mutual heating connecting pipeline and the second manual valve of the alkali liquid mutual heating connecting pipeline of the heat output subsystem closed; and keeping the alkali liquid isolation valve open in the heat output subsystem; Step 3, opening the first automatic valve of the alkali solution mutual heating connecting pipe, the first manual valve of the alkali solution mutual heating connecting pipe, the second automatic valve of the alkali solution mutual heating connecting pipe and the second manual valve of the alkali solution mutual heating connecting pipe in the heat input subsystem; closing the alkali solution isolation valve in the heat input subsystem, and keeping the first automatic valve of the alkali solution filter, the first manual valve of the alkali solution filter, the second automatic valve of the alkali solution filter and the second manual valve of the alkali solution filter in the heat input subsystem closed; Step 4, start the alkali liquid circulation pump, the low-temperature alkali liquid in the heat input subsystem flows through the first automatic valve of the alkali liquid mutual heating connecting pipe and the first manual valve of the alkali liquid mutual heating connecting pipe in the heat input subsystem in sequence, and is input into the alkali liquid mutual heating connecting alkali inlet main pipe, and is input into the heat output subsystem through the alkali liquid mutual heating connecting alkali inlet main pipe, and then is input into the alkali liquid heat exchanger in the heat output subsystem through the second automatic valve of the alkali liquid filter and the second manual valve of the alkali liquid filter in the heat output subsystem, and exchanges heat with the high-temperature alkali liquid in the heat output subsystem, and after heat exchange, is input into the alkali liquid mutual heating connecting alkali return main pipe through the first automatic valve of the alkali liquid filter and the first manual valve of the alkali liquid filter in the heat output subsystem, and is input into the heat input subsystem through the alkali liquid mutual heating connecting alkali return main pipe, and then is transported to the alkali liquid circulation pump in the heat input subsystem through the second automatic valve of the alkali liquid mutual heating connecting pipe and the second manual valve of the alkali liquid mutual heating connecting pipe in the heat input subsystem, and then is transported to the electrolytic cell in the heat input subsystem.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention proposes an alkali solution mutual heating energy-saving system for an alkaline water electrolysis hydrogen production device. The system integrates a plurality of alkali solution mutual heating energy-saving subsystems. When the temperature in an electrolytic cell that is not in use or on standby during a power outage in the alkali solution mutual heating energy-saving subsystem drops below 80°C, heat is exchanged between the low-temperature alkali solution in the electrolytic cell and the high-temperature alkali solution in the operating electrolytic cell, thereby heating the low-temperature alkali solution and reducing the electric energy consumed in raising the temperature of the alkali solution in the electrolytic cell that is not in use or on standby during a power outage to an appropriate temperature.

[0016] Furthermore, when the system operates the alkali solution mutual heat energy-saving system, the amount of cooling water used can be reduced, thereby reducing the operating energy consumption of the cooling water system.

[0017] Furthermore, the system is connected to a demineralized water replenishment source on the hydrogen and oxygen separation unit, which can continuously provide the system with high-quality water, ensure the stability and efficiency of the hydrogen and oxygen separation process, and reduce system downtime and maintenance costs caused by water quality problems.

[0018] Furthermore, the system connects a cooling water heat exchanger between the outlet of the alkali solution circulation pump and the liquid inlet of the electrolytic cell, and accesses a cooling water source through a pipeline, which can effectively reduce the temperature of the alkali solution entering the electrolytic cell, ensure that the electrolysis process is carried out within a safe and appropriate temperature range, improve the electrolysis efficiency and equipment stability, and extend the service life of the equipment.

[0019] Furthermore, the system sets alkali replenishment pipes and alkali return pipes in the alkali solution circulation system and connects them to the alkali solution source, which can flexibly adjust the alkali solution concentration and circulation volume to ensure that the alkali solution in the electrolytic cell is maintained in the best working state, improve the electrolysis efficiency and hydrogen purity, and enhance the stability and flexibility of the system.

[0020] Furthermore, the system adds an alkali solution filter on the pipeline between the outlet of the alkali solution circulation pump and the cooling water heat exchanger, which can effectively remove impurities and particulate matter in the alkali solution, further ensure the quality of the alkali solution entering the electrolytic cell, improve the electrolysis efficiency and hydrogen quality, while reducing equipment wear and extending the overall service life of the system.

[0021] The present invention proposes a method for using an alkali solution mutual heat energy-saving system of an alkaline water electrolysis hydrogen production device. The method realizes effective heat exchange between high-temperature alkali solution and low-temperature alkali solution by accurately controlling valve switches in multiple alkali solution mutual heat energy-saving subsystems. The method not only improves the utilization efficiency of the alkali solution and reduces energy consumption, but also ensures the temperature stability of the alkali solution during the circulation process, thereby optimizing the working conditions of the electrolyzer and improving the hydrogen production efficiency; in addition, the method is easy to operate, easy to realize automatic control, and reduces the complexity and error rate of manual operation. Through intelligent temperature monitoring and valve control, the system can adjust the heat exchange process in real time, ensure the heat balance between the subsystems, and achieve the maximum energy saving of alkali solution mutual heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the connection of the alkaline water electrolysis hydrogen production device proposed in the present invention; In the attached drawings: 1. alkali solution heat exchanger; 2. alkali solution isolation valve; 3. alkali solution filter; 4. cooling water heat exchanger; 5. alkali solution mutual heating connecting pipeline automatic valve; 6. alkali solution mutual heating connecting pipeline manual valve; 7. alkali solution filter automatic valve; 8. alkali solution filter manual valve; 9. alkali solution filter automatic valve; 10. alkali solution filter manual valve; 11. alkali solution mutual heating connecting pipeline automatic valve; 12. alkali solution mutual heating connecting pipeline manual valve. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] See also Figure 1 The present invention discloses an alkali solution mutual heating energy-saving system for an alkaline water electrolysis hydrogen production device. The system includes a plurality of alkali solution mutual heating energy-saving subsystems, each of which includes a hydrogen-oxygen separation unit, an electrolytic cell, an alkali solution heat exchanger 1, an alkali solution isolation valve 2, a first automatic valve 5 for an alkali solution mutual heating connecting pipeline, a first manual valve 6 for an alkali solution mutual heating connecting pipeline, a first automatic valve 7 for an alkali solution filter, a first manual valve 8 for an alkali solution filter, a second automatic valve 9 for an alkali solution filter, a second manual valve 10 for an alkali solution filter, a second automatic valve 11 for an alkali solution mutual heating connecting pipeline, a second manual valve 12 for an alkali solution mutual heating connecting pipeline, and an alkali solution circulation pump; The liquid outlet of the hydrogen-oxygen separation unit is connected to the first input interface of the alkali liquid heat exchanger 1 through a pipeline, the first output interface of the alkali liquid heat exchanger 1 is connected to the input end interface of the alkali liquid isolation valve 2 through a pipeline, the output end interface of the alkali liquid isolation valve 2 is connected to the liquid inlet of the alkali liquid circulation pump through a pipeline, the liquid outlet of the alkali liquid circulation pump is connected to the liquid inlet of the electrolyzer through a pipeline, the gas outlet of the electrolyzer is connected to the gas inlet of the hydrogen-oxygen separation unit through a pipeline, and the gas outlet of the hydrogen-oxygen separation unit is externally connected to a gas collector through a pipeline; Among them, the models of the first automatic valve 5 of the alkali solution mutual heating connecting pipeline, the first automatic valve 7 of the alkali solution filter, the first manual valve 8 of the alkali solution filter, the second manual valve 10 of the alkali solution filter, and the second manual valve 12 of the alkali solution mutual heating connecting pipeline are Q41H-25P; the models of the first manual valve 6 of the alkali solution mutual heating connecting pipeline, the second automatic valve 9 of the alkali solution filter, and the second automatic valve 11 of the alkali solution mutual heating connecting pipeline are Q641H-25P.

[0030] A second interface on the alkali liquid heat exchanger 1 located on the same side as the first input interface is connected to an interface at one end of the first automatic valve 7 of the alkali liquid filter through a pipeline, and the other end of the interface of the alkali liquid filter automatic valve 7 is connected to an interface at one end of the manual valve 8 of the alkali liquid filter through a pipeline. A third interface on the alkali liquid heat exchanger 1 located on the same side as the first output interface is connected to an interface at one end of the second automatic valve 9 of the alkali liquid filter through a pipeline, and the other end of the interface of the second automatic valve 9 of the alkali liquid filter is connected to an interface at one end of the second manual valve 10 of the alkali liquid filter through a pipeline, and the other end of the interface of the second manual valve 10 of the alkali liquid filter is connected to an interface at one end of the first manual valve 6 of the alkali liquid mutual heating connecting pipeline through a pipeline, wherein the pipeline connecting the second manual valve 10 of the alkali liquid filter and the first manual valve 6 of the alkali liquid mutual heating connecting pipeline in one alkali liquid mutual heating energy-saving subsystem is connected to the pipeline connecting the second manual valve 10 of the alkali liquid filter and the first manual valve 6 of the alkali liquid mutual heating connecting pipeline in other alkali liquid mutual heating energy-saving subsystems through the alkali liquid mutual heating connecting alkali inlet main pipe; The other end interface of the first manual valve 6 of the alkali liquid mutual heating connecting pipeline is connected to one end interface of the first automatic valve 5 of the alkali liquid mutual heating connecting pipeline through a pipeline, the other end interface of the first automatic valve 5 of the alkali liquid mutual heating connecting pipeline is connected to the input end interface of the alkali liquid isolation valve 2, the pipeline connecting the output end interface of the alkali liquid isolation valve 2 and the liquid inlet of the alkali liquid circulation pump is connected to one end interface of the second automatic valve 11 of the alkali liquid mutual heating connecting pipeline through a branch pipeline, the other end interface of the second automatic valve 11 of the alkali liquid mutual heating connecting pipeline is connected to one end interface of the second manual valve 12 of the alkali liquid mutual heating connecting pipeline through a pipeline, the other end interface of the second manual valve 12 of the alkali liquid mutual heating connecting pipeline and the other end interface of the alkali liquid filter manual valve 8 are connected to one end interface of the alkali liquid mutual heating connecting pipeline manual valve 12 in other alkali liquid mutual heating energy-saving subsystems away from the second automatic valve 11 of the alkali liquid mutual heating connecting pipeline and the other end interface of the alkali liquid filter automatic valve 7 away from the alkali liquid filter manual valve 8 through the alkali liquid mutual heating connecting alkali return mother pipe.

[0031] The hydrogen and oxygen separation unit is connected to a desalted water replenishment source through a pipeline. The desalted water replenishment provides a stable water source, ensures the purity of water quality, maintains a stable liquid level and protects the safety of the system, thus ensuring the efficiency, stability and safety of the hydrogen and oxygen separation process.

[0032] A cooling water heat exchanger 4 is connected to the pipeline connecting the liquid outlet of the alkali liquid circulation pump and the liquid inlet of the electrolyzer. The cooling water heat exchanger 4 is connected to a cooling water source through a pipeline. The cooling water heat exchanger 4 is used to cool the alkali liquid mutual heat energy-saving subsystem to avoid the alkali liquid temperature input into the electrolyzer from the alkali liquid mutual heat energy-saving subsystem being too high, which affects the normal operation of the electrolyzer, ensures that the alkali liquid mutual heat energy-saving subsystem can operate continuously and stably, and improves the efficiency of hydrogen production by electrolysis of water.

[0033] An alkali replenishing pipe is connected to the pipeline connecting the liquid inlet of the alkali liquid circulation pump and the alkali liquid isolation valve 2, and an alkali return pipe is connected to the pipeline connecting the liquid outlet of the alkali liquid circulation pump and the cooling water heat exchanger 4. The alkali replenishing pipe and the alkali return pipe are connected to the alkali liquid source. The alkali replenishing pipe can be used to replenish sufficient alkali liquid for the alkali liquid mutual heat energy-saving subsystem. At the same time, when the temperature of the alkali liquid input into the electrolytic cell is too high, the alkali liquid input into the electrolytic cell can be circulated with the alkali liquid in the alkali liquid source through the alkali replenishing pipe and the alkali return pipe to cool the alkali liquid, so that the temperature of the alkali liquid input into the electrolytic cell is maintained within a certain range, thereby improving the safety of the alkali liquid mutual heat energy-saving subsystem during operation.

[0034] See also Figure 1 A lye filter 3 is provided on the pipeline connecting the liquid outlet of the lye circulation pump and the cooling water heat exchanger 4, and is located between the liquid outlet of the lye circulation pump and the alkali return pipe. The lye is filtered by the lye filter 3 to filter out impurity particles carried by the lye in the process of flowing through the lye mutual heat energy-saving subsystem, so as to ensure the cleanliness of the lye input into the electrolytic cell.

[0035] See also Figure 1 In each alkali solution mutual heat energy-saving subsystem, the electrolytic cell is connected to the electrolytic cell power supply and distribution system through a wire, and the electrolytic cell power supply and distribution system provides a stable working power supply for the electrolytic cell, wherein the electrolytic cell power supply and distribution system includes a rectifier transformer and a DC rectifier cabinet, and the rectifier transformer wires are connected to the outer wall power supply and the DC rectifier cabinet, and the DC rectifier cabinet wires are connected to the electrolytic cell.

[0036] The present invention also proposes a method for using the alkali solution mutual heating energy-saving system of the alkaline water electrolysis hydrogen production device, which is used to control the above system, and specifically includes the following steps: Step 1, obtaining the alkali liquid temperatures in multiple alkali liquid mutual heat energy-saving subsystems, determining that the alkali liquid mutual heat energy-saving subsystem corresponding to the highest alkali liquid temperature is the heat output subsystem, and the other alkali liquid mutual heat energy-saving subsystems are the heat input subsystems; Step 2, opening the first automatic valve of the alkali liquid filter, the first manual valve of the alkali liquid filter, the second automatic valve of the alkali liquid filter and the second manual valve of the alkali liquid filter of the heat output subsystem, and keeping the first automatic valve of the alkali liquid mutual heating connecting pipeline, the first manual valve of the alkali liquid mutual heating connecting pipeline, the second automatic valve of the alkali liquid mutual heating connecting pipeline and the second manual valve of the alkali liquid mutual heating connecting pipeline of the heat output subsystem closed; and keeping the alkali liquid isolation valve open in the heat output subsystem; Step 3, opening the first automatic valve of the alkali solution mutual heating connecting pipe, the first manual valve of the alkali solution mutual heating connecting pipe, the second automatic valve of the alkali solution mutual heating connecting pipe and the second manual valve of the alkali solution mutual heating connecting pipe in the heat input subsystem; closing the alkali solution isolation valve in the heat input subsystem, and keeping the first automatic valve of the alkali solution filter, the first manual valve of the alkali solution filter, the second automatic valve of the alkali solution filter and the second manual valve of the alkali solution filter in the heat input subsystem closed; Step 4, start the alkali liquid circulation pump, the low-temperature alkali liquid in the heat input subsystem flows through the first automatic valve of the alkali liquid mutual heating connecting pipe and the first manual valve of the alkali liquid mutual heating connecting pipe in the heat input subsystem in sequence, and is input into the alkali liquid mutual heating connecting alkali inlet main pipe, and is input into the heat output subsystem through the alkali liquid mutual heating connecting alkali inlet main pipe, and then is input into the alkali liquid heat exchanger in the heat output subsystem through the second automatic valve of the alkali liquid filter and the second manual valve of the alkali liquid filter in the heat output subsystem, and exchanges heat with the high-temperature alkali liquid in the heat output subsystem, and after heat exchange, is input into the alkali liquid mutual heating connecting alkali return main pipe through the first automatic valve of the alkali liquid filter and the first manual valve of the alkali liquid filter in the heat output subsystem, and is input into the heat input subsystem through the alkali liquid mutual heating connecting alkali return main pipe, and then is transported to the alkali liquid circulation pump in the heat input subsystem through the second automatic valve of the alkali liquid mutual heating connecting pipe and the second manual valve of the alkali liquid mutual heating connecting pipe in the heat input subsystem, and then is transported to the electrolytic cell in the heat input subsystem.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. Alkaline water electrolysis hydrogen production device alkali solution mutual heating energy saving system, characterized in that: The invention comprises a plurality of alkali solution mutual heating energy-saving subsystems, each of which comprises a hydrogen-oxygen separation unit, an electrolytic cell, an alkali solution heat exchanger (1), an alkali solution isolation valve (2), a first automatic valve (5) of an alkali solution mutual heating connecting pipeline, a first manual valve (6) of an alkali solution mutual heating connecting pipeline, a first manual valve (8) of an alkali solution filter, a second manual valve (10) of an alkali solution filter, a second manual valve (12) of an alkali solution mutual heating connecting pipeline, and an alkali solution circulation pump; The liquid outlet of the hydrogen-oxygen separation unit is connected to the first input interface of the alkali liquid heat exchanger (1) through a pipeline, the first output interface of the alkali liquid heat exchanger (1) is connected to the input end interface of the alkali liquid isolation valve (2), the output end interface of the alkali liquid isolation valve (2) is connected to the liquid inlet of the alkali liquid circulation pump, and the liquid outlet of the alkali liquid circulation pump is connected to the liquid inlet of the electrolytic cell; The second interface on the alkali liquid heat exchanger (1) located on the same side as the first input interface is connected to an interface of one end of the manual valve (8) of the alkali liquid filter; the third interface on the alkali liquid heat exchanger (1) located on the same side as the first output interface is connected to an interface of one end of the second manual valve (10) of the alkali liquid filter, and the other end of the interface of the second manual valve (10) of the alkali liquid filter is connected to an interface of one end of the first manual valve (6) of the alkali liquid mutual heating connecting pipeline; the other end of the interface of the first manual valve (6) of the alkali liquid mutual heating connecting pipeline is connected to the input end interface of the alkali liquid isolation valve (2), and the alkali liquid The output end interface of the isolation valve (2) and the liquid inlet of the alkali liquid circulation pump are connected to one end interface of the second manual valve (12) of the alkali liquid mutual heating connecting pipeline through a branch pipeline, and the other end interface of the second manual valve (12) of the alkali liquid mutual heating connecting pipeline and the other end interface of the alkali liquid filter manual valve (8) are connected to one end interface of the alkali liquid mutual heating connecting pipeline manual valve (12) in other alkali liquid mutual heating energy-saving subsystems away from the alkali liquid isolation valve (2) and the other end interface of the alkali liquid filter manual valve (8) away from the alkali liquid heat exchanger (1) through the alkali liquid mutual heating connecting alkali return main pipe; The pipeline connecting the second manual valve (10) of the alkali solution filter and the first manual valve (6) of the alkali solution mutual heating connecting pipeline in one of the alkali solution mutual heating energy-saving subsystems is connected to the pipeline connecting the second manual valve (10) of the alkali solution filter and the first manual valve (6) of the alkali solution mutual heating connecting pipeline in the other alkali solution mutual heating energy-saving subsystems through the alkali solution mutual heating connecting alkali inlet main pipe.

2. The alkaline water electrolysis hydrogen production device alkali solution mutual heat energy saving system according to claim 1, characterized in that: The hydrogen-oxygen separation unit is connected to a demineralized water supplement source via a pipeline.

3. The alkaline water electrolysis hydrogen production device alkali solution mutual heat energy saving system according to claim 1, characterized in that: A cooling water heat exchanger (4) is connected between the liquid outlet of the alkali solution circulation pump and the liquid inlet of the electrolytic cell, and the cooling water heat exchanger (4) is connected to a cooling water source via a pipeline.

4. The alkaline water electrolysis hydrogen production device alkali solution mutual heat energy saving system according to claim 1, characterized in that: A alkali replenishment pipe is connected to the pipeline connecting the liquid inlet of the alkali liquid circulation pump and the alkali liquid isolation valve (2), and a alkali return pipe is connected to the pipeline connecting the liquid outlet of the alkali liquid circulation pump and the cooling water heat exchanger (4). The alkali replenishment pipe and the alkali return pipe are connected to an alkali liquid source.

5. The alkaline water electrolysis hydrogen production device alkali solution mutual heat energy saving system according to claim 1, characterized in that: An alkali solution filter (3) is provided on the pipeline connecting the liquid outlet of the alkali solution circulation pump and the cooling water heat exchanger (4) at a position between the liquid outlet of the alkali solution circulation pump and the alkali return pipe.

6. The alkaline water electrolysis hydrogen production device alkali solution mutual heat energy saving system according to claim 5, characterized in that: The alkali solution filter (3) is one or more of a PPH alloy integrally formed bag filter, a polypropylene (PP) single-layer filter, a stainless steel filter element filter, and a pure PP filter.

7. The alkaline water electrolysis hydrogen production device alkali solution mutual heat energy saving system according to claim 1, characterized in that: The electrolytic cell is connected to an electrolytic cell power supply and distribution system via wires. The electrolytic cell power supply and distribution system includes a rectifier transformer and a DC rectifier cabinet. The rectifier transformer wires are connected to an external wall power supply and the DC rectifier cabinet. The DC rectifier cabinet wires are connected to the electrolytic cell.

8. The alkaline water electrolysis hydrogen production device alkali solution mutual heat energy saving system according to claim 1, characterized in that: A first automatic valve (7) for an alkali liquid filter is provided on a pipeline connecting the alkali liquid heat exchanger (1) and the first manual valve (8) for an alkali liquid filter, and a second automatic valve (9) for an alkali liquid filter is provided on a pipeline connecting the alkali liquid heat exchanger (1) and the second manual valve (10) for an alkali liquid filter.

9. The alkaline water electrolysis hydrogen production device alkali solution mutual heat energy saving system according to claim 1, characterized in that: A first automatic valve (5) for mutually heating alkali solution connecting pipe is arranged on the pipeline connecting the first manual valve (6) for mutually heating alkali solution connecting pipe and the alkali solution isolation valve (2); The branch pipeline is provided with a second automatic valve (11) for the alkali solution mutual heating connecting pipeline.

10. A method for using an alkaline water electrolysis hydrogen production device alkali solution mutual heating energy-saving system, used to control the system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, obtaining the alkali liquid temperatures in multiple alkali liquid mutual heat energy-saving subsystems, determining that the alkali liquid mutual heat energy-saving subsystem corresponding to the highest alkali liquid temperature is the heat output subsystem, and the other alkali liquid mutual heat energy-saving subsystems are the heat input subsystems; Step 2, opening the first automatic valve of the alkali liquid filter, the first manual valve of the alkali liquid filter, the second automatic valve of the alkali liquid filter and the second manual valve of the alkali liquid filter of the heat output subsystem, and keeping the first automatic valve of the alkali liquid mutual heating connecting pipeline, the first manual valve of the alkali liquid mutual heating connecting pipeline, the second automatic valve of the alkali liquid mutual heating connecting pipeline and the second manual valve of the alkali liquid mutual heating connecting pipeline of the heat output subsystem closed; and keeping the alkali liquid isolation valve open in the heat output subsystem; Step 3, opening the first automatic valve of the alkali solution mutual heating connecting pipe, the first manual valve of the alkali solution mutual heating connecting pipe, the second automatic valve of the alkali solution mutual heating connecting pipe and the second manual valve of the alkali solution mutual heating connecting pipe in the heat input subsystem; closing the alkali solution isolation valve in the heat input subsystem, and keeping the first automatic valve of the alkali solution filter, the first manual valve of the alkali solution filter, the second automatic valve of the alkali solution filter and the second manual valve of the alkali solution filter in the heat input subsystem closed; Step 4, start the alkali liquid circulation pump, the low-temperature alkali liquid in the heat input subsystem flows through the first automatic valve of the alkali liquid mutual heating connecting pipe and the first manual valve of the alkali liquid mutual heating connecting pipe in the heat input subsystem in sequence, and is input into the alkali liquid mutual heating connecting alkali inlet main pipe, and is input into the heat output subsystem through the alkali liquid mutual heating connecting alkali inlet main pipe, and then is input into the alkali liquid heat exchanger in the heat output subsystem through the second automatic valve of the alkali liquid filter and the second manual valve of the alkali liquid filter in the heat output subsystem, and exchanges heat with the high-temperature alkali liquid in the heat output subsystem, and after heat exchange, is input into the alkali liquid mutual heating connecting alkali return main pipe through the first automatic valve of the alkali liquid filter and the first manual valve of the alkali liquid filter in the heat output subsystem, and is input into the heat input subsystem through the alkali liquid mutual heating connecting alkali return main pipe, and then is transported to the alkali liquid circulation pump in the heat input subsystem through the second automatic valve of the alkali liquid mutual heating connecting pipe and the second manual valve of the alkali liquid mutual heating connecting pipe in the heat input subsystem, and then is transported to the electrolytic cell in the heat input subsystem.

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