Alkali liquor type electrolytic bath waste heat steam supply system and steam supply method

Abstract

The invention relates to the technical field of electrolytic bath waste heat recovery, in particular to an alkali liquor type electrolytic bath waste heat steam supply system and a steam supply method. The system comprises a waste heat recovery module, a heat pump module and a steam preparation and supply module. The waste heat recovery module comprises an alkali liquor type electrolysis unit and a cooling unit, the cooling unit is connected with the alkali liquor type electrolysis unit, the heat pump module comprises a first power supply unit, a second power supply unit, a motor and a compressor, the first power supply unit and the second power supply unit are electrically connected with the motor, and the motor is connected with the compressor. The steam preparation and supply module comprises a steam preparation unit and a steam supply unit, and the cooling unit and the steam preparation unit are connected with the compressor. Waste heat of the alkali liquor type electrolytic bath is absorbed through the heat exchange working medium, and after compression heating, heat supply network feed water is heated and evaporated into high-temperature steam which is supplied to industrial steam users.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic cell waste heat recovery, in particular to an alkali liquid electrolytic cell waste heat steam supply system and a steam supply method. Background Art

[0002] In large-scale wind and solar hydrogen storage bases, green hydrogen produced from clean electricity generated by wind power and photovoltaics can be used as clean fuel to supply road transportation, ships, aerospace, etc. It can also be used as raw material to produce chemical products such as methanol, ammonia, methane, etc. It can also be used as energy storage to balance and regulate the power system.

[0003] The alkaline liquid electrolyzer is currently the most mature technology route for hydrogen production by electrolysis of water, and is also the hydrogen production equipment commonly configured in wind and solar hydrogen storage bases. This equipment will continue to consume electricity during the process of hydrogen production by electrolysis of water, causing the temperature of the electrolysis reaction zone to gradually rise. In order to ensure the efficient operation of the electrolyzer, the excess heat needs to be taken away by cooling water to maintain the temperature of the electrolysis reaction zone. However, the heat taken away by this part of the cooling water is usually eventually dissipated into the environment through the air-cooled cooler, resulting in a large amount of heat waste. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide an alkali liquid electrolyzer waste heat steam supply system and a steam supply method to solve the problem of a large amount of heat waste in the prior art of water electrolysis hydrogen production because the waste heat taken away by the cooling water in the electrolyzer is dissipated into the environment through air cooling.

[0005] The invention discloses a lye electrolytic cell waste heat steam supply system, comprising: A waste heat recovery module, comprising an alkaline liquid electrolysis unit and a cooling unit, wherein cooling water is provided in the alkaline liquid electrolysis unit, a heat exchange medium is provided in the cooling unit, and the cooling unit is connected to the alkaline liquid electrolysis unit, so that the cooling water is introduced into the cooling unit to heat the heat exchange medium; A heat pump module, comprising a first power supply unit, a second power supply unit, a motor and a compressor, wherein the first power supply unit and the second power supply unit are electrically connected to the motor respectively, the first power supply unit outputs green electricity and photovoltaic abandoned electricity, the second power supply unit outputs electrochemical energy storage, the motor is connected to the compressor, and the compressor is connected to the cooling unit, so that the heat exchange medium heated in the cooling unit is introduced into the compressor for compression and heating; The steam preparation and supply module comprises a steam preparation unit and a steam supply unit, wherein the steam preparation unit is connected to the compressor so that the heat exchange medium after compression and heating is introduced into the steam preparation unit, and the steam preparation unit is connected to the steam supply unit so that the hot network feed water from the outlet of the steam supply unit is introduced into the steam preparation unit to be heated and evaporated by the heat exchange medium to generate industrial steam, and then output to the steam supply unit, and the steam preparation unit is also connected to the cooling unit so that the heat exchange medium after cooling in the steam preparation unit is circulated back to the cooling unit and heated by the cooling water of the alkaline liquid electrolysis unit.

[0006] Optionally, a first circulation unit is arranged between the alkali liquid electrolysis unit and the cooling unit, and the first circulation unit includes a first delivery pipeline and a first return pipeline. The first delivery pipeline connects the alkali liquid electrolysis unit and the cooling unit, and is used to introduce the cooling water in the alkali liquid electrolysis unit into the cooling unit. The first return pipeline connects the alkali liquid electrolysis unit and the cooling unit, and is used to return the cooling water after heat exchange in the cooling unit to the alkali liquid electrolysis unit. A first booster pump is arranged on the first return pipeline.

[0007] Optionally, a second circulation unit is arranged between the steam preparation unit and the steam supply unit, and the second circulation unit includes a second delivery pipeline and a second return pipeline, the second delivery pipeline connects the steam preparation unit and the steam supply unit, and is used to deliver the hot network feed water at the outlet of the steam supply unit to the steam preparation unit, a second booster pump is arranged on the second delivery pipeline, and the second return pipeline connects the steam preparation unit and the steam supply unit, and is used to supply the industrial steam prepared by the steam preparation unit back to the steam supply unit.

[0008] Optionally, the first power supply unit includes a main power grid, a transformer and a first circuit breaker, the main power grid outputs green electricity and photovoltaic power abandonment, and the main power grid, the transformer, the first circuit breaker and the motor are connected in sequence.

[0009] Optionally, the second power supply unit includes an electrochemical energy storage device and a second circuit breaker, the electrochemical energy storage device outputs stored electrochemical reaction electrical energy, and the electrochemical energy storage device, the second circuit breaker and the motor are connected in sequence.

[0010] Optionally, the heat pump module also includes a heat recovery unit, and the cooling unit is connected to the compressor via the heat recovery unit, so that the heat exchange medium heated in the cooling unit passes through the heat recovery unit and is introduced into the compressor, and the steam preparation unit is connected to the cooling unit via the heat recovery unit, so that the heat exchange medium cooled in the steam preparation unit passes through the heat recovery unit, and the heat exchange medium introduced from the cooling unit is heated and then introduced back into the cooling unit.

[0011] Optionally, a first product upgrading pipeline is connected between the cooling unit and the heat recovery unit, a second product upgrading pipeline is connected between the heat recovery unit and the compressor, and a third product upgrading pipeline is connected between the compressor and the steam preparation unit, so that the heat exchange medium heated in the cooling unit is introduced into the steam preparation unit through the first product upgrading pipeline, the second product upgrading pipeline and the third product upgrading pipeline in sequence; A cooling pipeline is connected between the steam preparation unit and the heat recovery unit, so that the heat exchange medium cooled in the steam preparation unit is introduced into the heat recovery unit through the cooling pipeline.

[0012] Optionally, the heat pump module further comprises an expander, wherein the expander is coaxially connected to a drive shaft of the compressor, and the expander is connected to a drive end of the motor; The heat recovery unit is connected to the cooling unit through the expander, so that the heat exchange medium cooled in the heat recovery unit is introduced into the expander to perform work and then introduced into the cooling unit.

[0013] Optionally, a working pipeline is connected between the heat recovery unit and the expander, and a fourth product upgrading pipeline is connected between the expander and the cooling unit, so that the heat exchange medium cooled in the heat recovery unit is led back to the cooling unit through the working pipeline and the fourth product upgrading pipeline in sequence.

[0014] The present invention also provides a steam supply method, using the above-mentioned alkali liquid electrolytic cell waste heat steam supply system, the steam supply method comprising: In response to the operation of the alkaline liquid electrolysis unit, the cooling water in the alkaline liquid electrolysis unit is introduced into the cooling unit under pressure, and the heat exchange medium in the cooling unit is heated, and the cooling water after heat exchange is returned to the alkaline liquid electrolysis unit; Introducing the heat exchange medium that absorbs heat in the cooling unit into the compressor for compression and reheating until it is heated to a preset temperature; Introducing the heat exchange medium heated in the compressor into the steam preparation unit, and introducing the hot network feed water in the steam supply unit into the steam preparation unit, until the introduced hot network feed water is heated and evaporated by the introduced heat exchange medium to generate industrial steam at a preset temperature; The generated industrial steam is output to the steam supply unit, and the heat exchange medium cooled in the steam preparation unit is introduced back to the cooling unit to continue absorbing heat.

[0015] Compared with the prior art, the alkali liquid electrolytic cell waste heat steam supply system and steam supply method provided in the embodiments of the present invention have the following beneficial effects: By setting up a waste heat recovery module, a heat pump module and a steam preparation and supply module, the heat exchange medium in the cooling unit is used to absorb the waste heat generated by the hydrogen production reaction in the alkaline liquid electrolysis unit, and the compressor is used to compress and heat the heat exchange medium after absorbing heat to form a high-pressure gas not lower than the preset temperature, so that the high-pressure gas formed by compression and heating is introduced into the steam preparation unit, and the hot network feed water at the outlet of the steam supply unit is heated and evaporated into high-temperature steam to meet the steam demand of the steam supply unit, thereby supplying industrial steam users. At the same time, the electric power of the motor driving the compressor is provided by green electricity, photovoltaic abandoned electricity, and electrochemical energy storage devices, which effectively solves the problem that alkaline liquid electrolysis units, steam supply units, etc. cannot withstand frequent start and stop. In this way, the waste heat, green electricity, etc. in the wind and solar hydrogen storage base are fully utilized to provide high-value-added industrial steam, avoid the situation of large-scale waste of electrolytic cell waste heat, and greatly improve the economic benefits of the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which: Figure 1 A schematic block diagram of the overall structure of a waste heat steam supply system for an alkali liquid electrolyzer provided in an embodiment of the present invention.

[0017] The reference numerals in the figures are: 1. Waste heat recovery module; 11. Alkaline liquid electrolysis unit; 12. Cooling unit; 13. First delivery pipeline; 14. First return pipeline; 15. First booster pump; 2. First power supply unit; 21. Power grid; 22. Transformer; 23. First circuit breaker; 3. Second power supply unit; 31. Electrochemical energy storage device; 32. Second circuit breaker; 4. Motor; 5. Compressor; 51. Third product upgrade pipeline; 6. Steam preparation and supply module; 61. Steam preparation unit; 62. Steam supply unit; 63. Second delivery pipeline; 64. Second return pipeline; 65. Second booster pump; 7. Heat recovery unit; 71. First product upgrade pipeline; 72. Second product upgrade pipeline; 73. Cooling pipeline; 8. Expander; 81. Working pipeline; 82. Fourth product upgrade pipeline. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present invention is described in detail.

[0019] The present invention discloses a waste heat steam supply system for an alkali liquid electrolyzer, comprising a waste heat recovery module 1, a heat pump module and a steam preparation and supply module 6. The waste heat recovery module 1 comprises an alkali liquid electrolysis unit 11 and a cooling unit 12, wherein cooling water is provided in the alkali liquid electrolysis unit 11, a heat exchange medium is provided in the cooling unit 12, and the cooling unit 12 is connected to the alkali liquid electrolysis unit 11, and is used to introduce cooling water into the cooling unit 12 to heat the heat exchange medium. The heat pump module comprises a first power supply unit 2, a second power supply unit 3, a motor 4 and a compressor 5. The first power supply unit 2 and the second power supply unit 3 are electrically connected to the motor 4 respectively, the first power supply unit 2 outputs green electricity and photovoltaic abandoned electricity, the second power supply unit 3 outputs electrochemical energy storage, the motor 4 is connected to the compressor 5, and the compressor 5 is connected to the cooling unit 12, so that the heat exchange medium heated in the cooling unit 12 is introduced into the compressor 5 for compression and heating. The steam preparation and supply module 6 comprises a steam preparation unit 61 and a steam supply unit 62. The steam preparation unit 61 is connected to the compressor 5 so that the compressed and heated heat exchange medium is introduced into the steam preparation unit 61. The steam preparation unit 61 is connected to the steam supply unit 62 so that the hot network feed water from the outlet of the steam supply unit 62 is introduced into the steam preparation unit 61 to be heated and evaporated by the heat exchange medium to generate industrial steam, and output to the steam supply unit 62. The steam preparation unit 61 is also connected to the cooling unit 12 so that the cooled heat exchange medium in the steam preparation unit 61 is circulated back to the cooling unit 12 and heated by the low-temperature water of the alkaline liquid electrolysis unit 11.

[0020] Through the implementation of the above-mentioned alkali liquid electrolyzer waste heat steam supply system embodiment, a waste heat recovery module 1, a heat pump module and a steam preparation and supply module 6 are set. The alkali liquid electrolysis unit 11 is an existing alkali liquid electrolysis device in the wind and solar hydrogen storage base. As the temperature of the electrolysis reaction zone gradually rises with the electrolysis of water to produce hydrogen in the alkali liquid electrolysis unit 11, the cooling water provided in the alkali liquid electrolysis unit 11 is used to absorb the waste heat of the electrolysis reaction zone. The cooling water that absorbs the waste heat is introduced into the cooling unit 12 to heat the heat exchange medium in the cooling unit 12 to fully absorb the waste heat generated by the hydrogen production reaction in the alkali liquid electrolysis unit 11. At this time, the waste heat in the electrolysis reaction zone is transferred from the cooling water to the heat exchange medium, and the heat exchange medium is low-grade thermal energy. The heated heat exchange medium is then compressed and heated by the compressor 5 to form a high-pressure gas not lower than a preset temperature. Preferably, the heat exchange medium is raised to a high-pressure gas of not less than 320°C in the compressor 5. Thus, by introducing the high-pressure gas formed by compression and heating into the steam preparation unit 61, the hot network feed water at the outlet of the steam supply unit 62 is heated and evaporated into high-temperature steam to meet the steam demand of the steam supply unit 62, thereby supplying industrial steam users. Preferably, since the heat exchange medium is raised to a high-pressure gas of not less than 320°C, the hot network feed water can be heated and evaporated into steam at about 300°C to supply industrial steam users. Since a chemical plant with hydrogen as a raw material is generally synchronously arranged around a large-scale wind and solar hydrogen storage base, the chemical plant usually has a large amount of industrial steam demand at about 300°C, so the embodiment of the present invention can provide high value-added industrial steam. In addition, the electric power of the motor 4 driving the compressor 5 is jointly provided by green electricity and photovoltaic abandoned electricity, as well as the electrochemical energy storage device 31, that is, the first power supply unit 2 generally provides wind power and photovoltaic abandoned electricity in the wind and solar hydrogen storage base to provide electric power for the motor 4; when there is no wind power or photovoltaic abandoned electricity, the second power supply unit 3 provides electrochemical energy storage in the wind and solar hydrogen storage base to provide electric power for the motor 4. By jointly supplying power to the first power supply unit 2 and the second power supply unit 3, the problem that the alkaline liquid electrolysis unit 11 and the steam supply unit 62 cannot withstand frequent start and stop can be effectively solved, and the efficiency of the heat exchange medium being compressed and heated to high-temperature gas can be improved to improve the steam preparation efficiency of the steam system. Among them, the steam supply unit 62 is an industrial steam demand user, generally a chemical plant that uses hydrogen as a raw material and is synchronously equipped around the wind and solar hydrogen storage base, and its chemical process usually cannot withstand frequent start and stop. Thereby making full use of the waste heat and green electricity of the alkaline liquid electrolyzer in the wind and solar hydrogen storage base, providing high-value-added industrial steam, avoiding the situation where a large amount of waste heat from the electrolyzer is wasted, and greatly improving the economic benefits of the base. Preferably, the cooling unit 12 is a cooler and the steam preparation unit 61 is a steam generator.

[0021] Preferably, in the embodiment of the present invention, the heat exchange medium can be air, carbon dioxide, argon, helium or nitrogen, etc. Different heat exchange mediums correspond to different system performance coefficients (COP); for the waste heat utilization temperature range of 80°C to 65°C for alkaline liquid electrolyzers, providing industrial steam at about 300°C, the COP is about 1.1 to 1.5.

[0022] Furthermore, a first circulation unit is provided between the alkaline liquid electrolysis unit 11 and the cooling unit 12. The first circulation unit includes a first delivery pipeline 13 and a first reflux pipeline 14. The first delivery pipeline 13 connects the alkaline liquid electrolysis unit 11 and the cooling unit 12, and is used to introduce the cooling water in the alkaline liquid electrolysis unit 11 into the cooling unit 12. The first reflux pipeline 14 connects the alkaline liquid electrolysis unit 11 and the cooling unit 12, and is used to reflux the cooling water after heat exchange in the cooling unit 12 into the alkaline liquid electrolysis unit 11. A first booster pump 15 is provided on the first reflux pipeline 14.

[0023] Through the implementation of the above-mentioned embodiment of the alkali liquid electrolytic cell waste heat steam supply system, the cooling water that absorbs the electrolytic cell waste heat in the alkali liquid electrolytic unit 11 can be transported to the cooling unit 12 by the first delivery pipeline 13, and the cooling water in the cooling unit 12 that has exchanged heat with the heat exchange medium can be led back to the alkali liquid electrolytic unit 11 by the first return pipeline 14 to continue absorbing the electrolytic cell waste heat, so that the first delivery pipeline 13 and the first return pipeline 14 constitute the first heat exchange loop of cooling water, so as to realize repeated and continuous absorption of the alkali liquid electrolytic cell waste heat, thereby making full use of the alkali liquid electrolytic cell waste heat. By setting the first booster pump 15, the flow pressure of the first heat exchange loop can be increased, so that the cooling water that absorbs the electrolytic cell waste heat in the alkali liquid electrolytic unit 11 can be pressurized and transported to the cooling unit 12 for heat exchange, thereby improving the heat exchange efficiency of the cooling unit 12.

[0024] Furthermore, a second circulation unit is arranged between the steam preparation unit 61 and the steam supply unit 62, and the second circulation unit includes a second delivery pipeline 63 and a second return pipeline 64. The second delivery pipeline 63 connects the steam preparation unit 61 and the steam supply unit 62, and is used to deliver the hot network feed water at the outlet of the steam supply unit 62 to the steam preparation unit 61. A second booster pump 65 is arranged on the second delivery pipeline 63. The second return pipeline 64 connects the steam preparation unit 61 and the steam supply unit 62, and is used to supply the industrial steam prepared by the steam preparation unit 61 back to the steam supply unit 62.

[0025] Through the implementation of the above-mentioned embodiment of the alkali liquid electrolyzer waste heat steam supply system, the hot network feed water at the outlet of the steam supply unit 62 can be transported to the steam preparation unit 61 by using the second delivery pipeline 63, and the industrial steam prepared by the steam preparation unit 61 can be supplied back to the steam supply unit 62 by using the second return pipeline 64, so as to be provided to the chemical plant using hydrogen as raw material around the wind and solar hydrogen storage base. The second delivery pipeline 63 and the second return pipeline 64 form a second heat exchange loop for hot network feed water and steam, so as to realize repeated heating and evaporation of the hot network feed water at the outlet of the steam supply unit 62, so as to continuously prepare high-temperature steam that meets the demand. By setting up the second booster pump 65, the industrial steam prepared by the steam preparation unit 61 can be pressurized and delivered to the steam supply unit 62, so as to overcome the pipeline resistance by increasing the pressure of steam delivery, so as to ensure the stability and continuity of steam supply.

[0026] Furthermore, the first power supply unit 2 includes a main power grid 21, a transformer 22 and a first circuit breaker 23, the main power grid 21 outputs green power and photovoltaic power abandonment, and the main power grid 21, the transformer 22, the first circuit breaker 23 and the motor 4 are connected in sequence.

[0027] Further, the second power supply unit 3 includes an electrochemical energy storage device 31 and a second circuit breaker 32 , the electrochemical energy storage device 31 outputs stored electrochemical reaction electric energy, and the electrochemical energy storage device 31 , the second circuit breaker 32 and the motor 4 are connected in sequence.

[0028] Through the implementation of the above-mentioned alkaline liquid electrolyzer waste heat steam supply system embodiment, the first power supply unit 2 is connected to green electricity and photovoltaic abandoned electricity through the main power grid 21, realizing diversified energy supply. Green electricity refers to electricity from renewable energy sources such as wind energy, solar energy, etc. from the wind and solar hydrogen storage base, while photovoltaic abandoned electricity refers to electricity that is oversupplied with solar photovoltaic power generation but not used in time. This configuration helps to reduce dependence on traditional fossil fuels, reduce carbon emissions, and support sustainable development. At the same time, the use of photovoltaic abandoned electricity avoids the waste of electricity and improves the efficiency of energy utilization. The electrochemical energy storage device 31 in the second power supply unit 3 can store electrical energy and release it when needed, which helps to smooth the load fluctuations of the power system of the wind and solar hydrogen storage base and optimize the dispatch of the power system. The first circuit breaker 23 and the second circuit breaker 32 are protective devices that can quickly cut off the circuit in the event of a short circuit or overload, protect the safety of system equipment and personnel, and switch the first power supply unit 2 and the second power supply unit 3. That is, the first circuit breaker 23 and the second circuit breaker 32 are closed at the same time, and the first power supply unit 2 and the second power supply unit 3 can be jointly powered. Alternatively, only the first circuit breaker 23 may be closed, and the first power supply unit 2 may provide wind power and photovoltaic power abandonment in the wind-solar hydrogen storage base to provide electric power for the motor 4; when there is no wind power or photovoltaic power abandonment, the second circuit breaker 32 may be closed, and the second power supply unit 3 may provide electrochemical energy storage in the wind-solar hydrogen storage base to provide electric power for the motor 4. Thus, the configuration of the first power supply unit 2 and the second power supply unit 3 is used to provide dual power supply guarantee. Even if the main power grid 21 fails or the power supply is unstable, the electrochemical energy storage device 31 may provide backup power to ensure the continuous operation of equipment such as the motor 4 and the compressor 5. In addition, the electric energy in the wind-solar hydrogen storage base is fully utilized to improve the economic benefits of the base. Moreover, the entire process does not use fossil fuels, has significant environmental benefits, complies with the relevant policies of green electricity hydrogen production ammonia, and can enjoy corresponding subsidies in the final product.

[0029] Furthermore, the heat pump module also includes a heat recovery unit 7, and the cooling unit 12 is connected to the compressor 5 through the heat recovery unit 7, so that the heat exchange medium heated in the cooling unit 12 passes through the heat recovery unit 7 and is introduced into the compressor 5. The steam preparation unit 61 is connected to the cooling unit 12 through the heat recovery unit 7, so that the heat exchange medium cooled in the steam preparation unit 61 passes through the heat recovery unit 7, and the heat exchange medium introduced from the cooling unit 12 is heated and then introduced back into the cooling unit 12.

[0030] Furthermore, a first product upgrading pipeline 71 is connected between the cooling unit 12 and the heat recovery unit 7, a second product upgrading pipeline 72 is connected between the heat recovery unit 7 and the compressor 5, and a third product upgrading pipeline 51 is connected between the compressor 5 and the steam preparation unit 61, so that the heat exchange medium heated in the cooling unit 12 is introduced into the steam preparation unit 61 through the first product upgrading pipeline 71, the second product upgrading pipeline 72 and the third product upgrading pipeline 51 in sequence. A cooling pipeline 73 is connected between the steam preparation unit 61 and the heat recovery unit 7, so that the heat exchange medium cooled in the steam preparation unit 61 is introduced into the heat recovery unit 7 through the cooling pipeline 73.

[0031] Through the implementation of the above-mentioned embodiment of the alkali liquid electrolyzer waste heat steam supply system, the heat recovery unit 7 is used. Since the heat exchange medium is first compressed and heated to a high temperature by the compressor 5, it enters the steam preparation unit 61 to heat and evaporate the heat network feed water. Therefore, the heat exchange medium after heat exchange in the steam preparation unit 61 will still have low-temperature heat. The heat exchange medium after heat exchange in the steam preparation unit 61 is introduced into the heat recovery unit 7 by the cooling pipeline 73. At the same time, the heat exchange medium after absorbing heat in the cooling unit 12 is first introduced into the heat recovery unit 7 by the first product upgrade pipeline 71 before entering the compressor 5, so that in the heat recovery unit 7, the heat exchange medium introduced from the steam preparation unit 61 heats the heat exchange medium introduced from the cooling unit 12, so as to make full use of the low-temperature heat of the heat exchange medium at the outlet of the steam preparation unit 61, thereby further recovering heat to improve the circulation efficiency and heat utilization efficiency of the system. At this time, the regenerative unit 7 has two working medium flow channels for heat exchange, so that the heated heat exchange working medium enters the compressor 5 through the second product upgrading pipeline 72, and the heat exchange working medium compressed and heated in the compressor 5 is introduced into the steam preparation unit 61 through the third product upgrading pipeline 51. The cooled heat exchange working medium in the regenerative unit 7 flows to the cooling unit 12. The setting of each pipeline in the system helps to optimize the heat exchange process, and improves the heat exchange efficiency through reasonable fluid path and pressure control.

[0032] Further, the heat pump module further comprises an expander 8, the expander 8 is coaxially connected to the drive shaft of the compressor 5, and the expander 8 is connected to the drive end of the motor 4; The heat recovery unit 7 is connected to the cooling unit 12 through the expander 8, so that the heat exchange medium cooled in the heat recovery unit 7 is introduced into the expander 8 to perform work and then introduced into the cooling unit 12.

[0033] Furthermore, a working pipeline 81 is connected between the heat recovery unit 7 and the expander 8, and a fourth product pipeline 82 is connected between the expander 8 and the cooling unit 12, so that the heat exchange medium cooled in the heat recovery unit 7 is led back to the cooling unit 12 through the working pipeline 81 and the fourth product pipeline 82 in turn.

[0034] Through the implementation of the above-mentioned embodiment of the alkali liquid electrolyzer waste heat steam supply system, the heat exchange medium cooled in the heat recovery unit 7 enters the expander 8 through the work pipeline 81 to further work, and further recovers the heat energy and pressure potential energy in the heat exchange medium, so that the heat energy in the whole system is fully utilized. And the expander 8 and the drive shaft of the compressor 5 are coaxially connected, so that the expander 8 recovers the heat energy and pressure potential energy of the heat exchange medium, which is converted into shaft power and provided to the compressor 5, and the expander 8 is connected to the motor 4, so that the shaft power of the compressor 5 is jointly provided by the expander 8 and the motor 4, so that the shaft power provided by the expander 8 can effectively reduce the electric power required to be provided by the motor 4, and fully utilize the heat energy in the system to reduce the electric power required to be provided by the motor 4 while keeping the steam preparation efficiency unchanged, greatly reducing power consumption, reducing operating costs, and enabling the system to more efficiently convert heat energy into useful work, thereby improving overall energy efficiency. After the heat exchange medium has completed work in the expander 8, it enters the cooling unit 12 through the fourth product upgrading pipeline 82 to continue to exchange heat with the cooling water that has absorbed the waste heat of the alkaline liquid electrolytic cell, thereby completing the entire cycle.

[0035] The present invention also provides a steam supply method, using the above-mentioned alkali liquid electrolytic cell waste heat steam supply system, the steam supply method comprises: In response to the operation of the alkaline liquid electrolysis unit 11, the cooling water in the alkaline liquid electrolysis unit 11 is pressurized and introduced into the cooling unit 12, and the heat exchange medium in the cooling unit 12 is heated, and the cooling water after heat exchange is returned to the alkaline liquid electrolysis unit 11; The heat exchange medium absorbed by the cooling unit 12 is introduced into the compressor 5 for compression and reheating until it reaches a preset temperature; The heat exchange medium heated in the compressor 5 is introduced into the steam preparation unit 61, and the hot network feed water in the steam supply unit 62 is introduced into the steam preparation unit 61, until the introduced hot network feed water is heated and evaporated by the introduced heat exchange medium to generate industrial steam of a preset temperature; The generated industrial steam is output to the steam supply unit 62, and the heat exchange medium cooled in the steam preparation unit 61 is introduced back to the cooling unit 12 to continue absorbing heat.

[0036] Through the implementation of the above steam supply method embodiment, the heat exchange medium recovers the waste heat of the alkaline liquid electrolyzer module in the cooling unit 12, and then enters the compressor 5 for compression. At this time, the green electricity and photovoltaic abandoned electricity, or electrochemical electricity, starts the compressor 5 through the motor 4, converts the heat exchange medium into high-grade thermal energy, and transports it to the steam preparation unit 61, so that the heat network feed water from the steam supply unit 62 exchanges heat with the heat exchange medium in the steam preparation unit 61, is evaporated into steam at about 300°C, and is supplied to steam users. In this way, the waste heat of the alkaline liquid electrolyzer and green electricity in the wind and solar hydrogen storage base are fully utilized to provide high-value-added industrial steam, avoid the situation of large-scale waste of electrolyzer waste heat, and greatly improve the economic benefits of the base.

[0037] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the protection scope of the present invention.

Claims

1. A waste heat steam supply system for an alkali liquid electrolyzer, characterized in that: The alkali liquid electrolyzer waste heat steam supply system comprises: A waste heat recovery module, comprising an alkaline liquid electrolysis unit and a cooling unit, wherein cooling water is provided in the alkaline liquid electrolysis unit, a heat exchange medium is provided in the cooling unit, and the cooling unit is connected to the alkaline liquid electrolysis unit, so that the cooling water is introduced into the cooling unit to heat the heat exchange medium; A heat pump module, comprising a first power supply unit, a second power supply unit, a motor and a compressor, wherein the first power supply unit and the second power supply unit are electrically connected to the motor respectively, the first power supply unit outputs green electricity and photovoltaic abandoned electricity, the second power supply unit outputs electrochemical energy storage, the motor is connected to the compressor, and the compressor is connected to the cooling unit, so that the heat exchange medium heated in the cooling unit is introduced into the compressor for compression and heating; The steam preparation and supply module comprises a steam preparation unit and a steam supply unit, wherein the steam preparation unit is connected to the compressor so that the heat exchange medium after compression and heating is introduced into the steam preparation unit, and the steam preparation unit is connected to the steam supply unit so that the hot network feed water from the outlet of the steam supply unit is introduced into the steam preparation unit to be heated and evaporated by the heat exchange medium to generate industrial steam, and then output to the steam supply unit, and the steam preparation unit is also connected to the cooling unit so that the heat exchange medium after cooling in the steam preparation unit is circulated back to the cooling unit and heated by the cooling water of the alkaline liquid electrolysis unit.

2. The alkali liquid electrolytic cell waste heat steam supply system according to claim 1, characterized in that: A first circulation unit is arranged between the alkaline liquid electrolysis unit and the cooling unit, and the first circulation unit includes a first delivery pipeline and a first reflux pipeline. The first delivery pipeline connects the alkaline liquid electrolysis unit and the cooling unit, and is used to introduce the cooling water in the alkaline liquid electrolysis unit into the cooling unit. The first reflux pipeline connects the alkaline liquid electrolysis unit and the cooling unit, and is used to return the cooling water after heat exchange in the cooling unit to the alkaline liquid electrolysis unit. A first booster pump is arranged on the first reflux pipeline.

3. The alkali liquid electrolytic cell waste heat steam supply system according to claim 1, characterized in that: A second circulation unit is arranged between the steam preparation unit and the steam supply unit, and the second circulation unit includes a second delivery pipeline and a second return pipeline. The second delivery pipeline connects the steam preparation unit and the steam supply unit, and is used to deliver the hot network feed water at the outlet of the steam supply unit to the steam preparation unit. A second booster pump is arranged on the second delivery pipeline, and the second return pipeline connects the steam preparation unit and the steam supply unit, and is used to supply the industrial steam prepared by the steam preparation unit back to the steam supply unit.

4. The alkali liquid electrolytic cell waste heat steam supply system according to claim 1, characterized in that: The first power supply unit includes a main power grid, a transformer and a first circuit breaker. The main power grid outputs green electricity and photovoltaic abandoned power, and the main power grid, the transformer, the first circuit breaker and the motor are connected in sequence.

5. The alkali liquid electrolytic cell waste heat steam supply system according to claim 4, characterized in that: The second power supply unit includes an electrochemical energy storage device and a second circuit breaker. The electrochemical energy storage device outputs stored electrochemical reaction electrical energy, and the electrochemical energy storage device, the second circuit breaker and the motor are connected in sequence.

6. The alkali liquid electrolytic cell waste heat steam supply system according to any one of claims 1 to 5, characterized in that: The heat pump module also includes a heat recovery unit, and the cooling unit is connected to the compressor through the heat recovery unit, so that the heat exchange medium heated in the cooling unit passes through the heat recovery unit and is introduced into the compressor. The steam preparation unit is connected to the cooling unit through the heat recovery unit, so that the heat exchange medium cooled in the steam preparation unit passes through the heat recovery unit, and the heat exchange medium introduced from the cooling unit is heated and then introduced back into the cooling unit.

7. The alkali liquid electrolytic cell waste heat steam supply system according to claim 6, characterized in that: A first product upgrading pipeline is connected between the cooling unit and the heat recovery unit, a second product upgrading pipeline is connected between the heat recovery unit and the compressor, and a third product upgrading pipeline is connected between the compressor and the steam preparation unit, so that the heat exchange medium heated in the cooling unit is introduced into the steam preparation unit through the first product upgrading pipeline, the second product upgrading pipeline and the third product upgrading pipeline in sequence; A cooling pipeline is connected between the steam preparation unit and the heat recovery unit, so that the heat exchange medium cooled in the steam preparation unit is introduced into the heat recovery unit through the cooling pipeline.

8. The alkali liquid electrolytic cell waste heat steam supply system according to claim 6, characterized in that: The heat pump module further comprises an expander, the expander is coaxially connected to the drive shaft of the compressor, and the expander is connected to the drive end of the motor; The heat recovery unit is connected to the cooling unit through the expander, so that the heat exchange medium cooled in the heat recovery unit is introduced into the expander to perform work and then introduced into the cooling unit.

9. The alkali liquid electrolytic cell waste heat steam supply system according to claim 8, characterized in that: A working pipeline is connected between the heat recovery unit and the expander, and a fourth product upgrading pipeline is connected between the expander and the cooling unit, so that the heat exchange medium cooled in the heat recovery unit is led back to the cooling unit through the working pipeline and the fourth product upgrading pipeline in sequence.

10. A steam supply method, using the alkali liquid electrolytic cell waste heat steam supply system according to any one of claims 1 to 9, characterized in that: The steam supply method comprises: In response to the operation of the alkaline liquid electrolysis unit, the cooling water in the alkaline liquid electrolysis unit is introduced into the cooling unit under pressure, and the heat exchange medium in the cooling unit is heated, and the cooling water after heat exchange is returned to the alkaline liquid electrolysis unit; Introducing the heat exchange medium that absorbs heat in the cooling unit into the compressor for compression and reheating until it is heated to a preset temperature; Introducing the heat exchange medium heated in the compressor into the steam preparation unit, and introducing the hot network feed water in the steam supply unit into the steam preparation unit, until the introduced hot network feed water is heated and evaporated by the introduced heat exchange medium to generate industrial steam at a preset temperature; The generated industrial steam is output to the steam supply unit, and the heat exchange medium cooled in the steam preparation unit is introduced back to the cooling unit to continue absorbing heat.

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