A hydrogen production, storage and supply system based on power station

Abstract

This invention relates to the field of hydrogen production technology and discloses a hydrogen production, storage, and supply system based on a power plant. The system includes a hydrogen production, storage, and supply unit and a power plant unit. The hydrogen production, storage, and supply unit includes a hydrogen production section and a hydrogen storage section. The hydrogen production section produces hydrogen and delivers it to the hydrogen storage section for storage. The power plant unit includes a refrigeration section, a heating section, and a power generation section. The refrigeration and heating sections are connected to the hydrogen storage section to provide cold and heat energy to the hydrogen storage section, assisting the internal alloy of the hydrogen storage section in absorbing or releasing hydrogen. The power generation section is connected to both the hydrogen production section and the hydrogen storage section. The power generation section provides electricity to the hydrogen production section and obtains low-temperature hydrogen from the hydrogen storage section for cooling. This invention combines the hydrogen production, storage, and supply unit with the power plant unit, utilizing the refrigeration and heating sections of the power plant unit to provide cold and heat energy to the hydrogen storage section. This accelerates the hydrogen absorption and release rates, fully utilizes excess heat energy from the power plant, reduces hydrogen storage costs, and avoids energy waste in the power plant unit.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production technology, and in particular to a hydrogen production, storage and supply system based on a power plant. Background Technology

[0002] Currently, a large proportion of generator sets in China utilize hydrogen energy technology. However, hydrogen is a flammable and explosive gas, and hydrogen leaks can easily cause fires and explosions. Therefore, the operation and maintenance of hydrogen-cooled generators and hydrogen production and storage devices require close attention. Hydrogen storage devices, in particular, need to store a certain volume and pressure of gaseous hydrogen for extended periods, which carries a higher risk factor.

[0003] Among existing technologies, metal alloy hydrogen storage technology features high safety, high volumetric hydrogen storage density, and system simplicity. Hydrogen undergoes physical adsorption, chemical adsorption, and decomposition on the surface of the metal alloy hydrogen storage material. Subsequently, hydrogen diffuses and migrates in atomic form within the hydrogen storage alloy until equilibrium is reached, ultimately storing in the interstitial spaces of the alloy's crystal lattice and combining with the alloy's atoms to form stable hydrides. The hydrogen absorption process of the hydrogen storage alloy is accompanied by heat release, while its reverse reaction, hydrogen release, is endothermic. Therefore, controlling the heat and cooling supply can ensure the safe release and absorption of hydrogen. However, controlling the heat and cooling supply also increases the cost of metal alloy hydrogen storage. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a hydrogen production, storage and supply system based on a power plant, thereby solving the technical problem of high cost of hydrogen storage using metal alloys in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: The present invention provides a hydrogen production, storage and supply system based on a power plant, including a hydrogen production, storage and supply unit and a power plant unit. The hydrogen production, storage and supply unit includes a hydrogen production section and a hydrogen storage section connected together. The hydrogen production section is used to produce hydrogen and transport it to the hydrogen storage section for storage. The power plant unit includes a refrigeration unit, a heating unit, and a power generation unit. The refrigeration unit and the heating unit are respectively connected to the hydrogen storage unit. The refrigeration unit and the heating unit are used to provide cold energy and heat energy to the hydrogen storage unit to assist the internal alloy of the hydrogen storage unit in absorbing or releasing hydrogen. The power generation unit is connected to the hydrogen production unit and the hydrogen storage unit. The power generation unit is used to provide electrical energy to the hydrogen production unit and to obtain low-temperature hydrogen from the hydrogen storage unit for cooling.

[0006] In some embodiments, the refrigeration unit includes an evaporator, a first pump body, and a chilled water tank. The evaporator, chilled water tank, first pump body, and hydrogen storage unit are sequentially connected. The hydrogen storage unit is also connected to the evaporator. The evaporator is used to deliver chilled water to the chilled water tank. The first pump body is used to drive the chilled water in the chilled water tank to flow back to the evaporator through the hydrogen storage unit, so as to absorb the heat released when the hydrogen storage unit absorbs hydrogen.

[0007] In some embodiments, the refrigeration unit further includes a generator, an absorber, a condenser, and a second pump body. The generator is connected to the heating unit, the absorber, and the condenser. The second pump body is disposed between the absorber and the generator. The condenser is connected to the evaporator. The generator is used to obtain the heat energy of the heating section to supply water vapor and concentrated high-concentration lithium bromide solution to the condenser and the absorber respectively; the condenser is used to cool and condense the water vapor and supply the condensed low-temperature liquid water to the evaporator. The evaporator is connected to the absorber, and the evaporator is used to transport low-temperature liquid water that has been vaporized after absorbing heat from the chilled water to the absorber. The second pump is used to draw a low-concentration lithium bromide solution from the absorber to the generator.

[0008] In some embodiments, the refrigeration unit further includes a heat exchanger disposed between the generator and the absorber, the heat exchanger being used to precool the high-concentration lithium bromide solution supplied by the generator to the absorber; The heat exchanger is also used to preheat the low-concentration lithium bromide solution delivered by the second pump body to the generator.

[0009] In some embodiments, the refrigeration unit further includes a third pump body and an expansion valve, the third pump body being disposed between the condenser and the evaporator, and the expansion valve being disposed between the third pump body and the evaporator.

[0010] In some embodiments, the heating unit includes a low-pressure economizer, a condenser, a preheater, and a fourth pump body, wherein the condenser, the fourth pump body, the preheater, and the low-pressure economizer are connected in sequence; the fourth pump body is used to extract low-temperature condensate from the condenser and transport it to the low-pressure economizer through the preheater; the low-pressure economizer is used to output heated high-temperature condensate to the preheater, and the preheater is used to output the high-temperature condensate to the hydrogen storage unit and the generator.

[0011] In some embodiments, the heating unit further includes a first heater, a second heater, a third heater, and a fourth heater connected in sequence, wherein the input end of the first heater is connected to the fourth pump body, and the output end of the fourth heater is connected to a deaerator; The fourth pump body is used to draw condensate from the condenser to the first heater, the second heater, the third heater and the fourth heater; The output terminals of the first heater and the second heater are both connected to the preheater to supply condensate to the low-pressure economizer through the preheater; The input terminals of the third heater and the fourth heater are both connected to the output terminals of the low-pressure economizer and the generator, respectively, to receive the condensate output by the low-pressure economizer and the generator.

[0012] In some embodiments, the output of the first heater is connected to the condenser to supply condensate to the condenser, and the condenser is connected to the input of the low-pressure economizer to return the condensate to the low-pressure economizer.

[0013] In some embodiments, the hydrogen production unit includes an electrolyzer electrically connected to the power generation unit, the electrolyzer being used to electrolyze desalinated water to generate hydrogen and oxygen.

[0014] In some embodiments, a deoxygenation drying device is provided between the electrolyzer and the hydrogen storage unit.

[0015] Compared with the prior art, the hydrogen production, storage and supply system based on a power plant provided in this embodiment of the invention has the following advantages: In this invention, hydrogen production and storage are integrated with a power plant unit. The power generation unit directly supplies electricity to the hydrogen production unit to electrolyze water and generate hydrogen, fully utilizing the advantages of the power plant and avoiding energy waste. Simultaneously, the refrigeration unit in the power plant unit absorbs heat energy from the hydrogen storage unit, thereby accelerating hydrogen absorption and storage efficiency, while the heating unit provides heat energy to the hydrogen storage unit, accelerating hydrogen release efficiency. The released hydrogen also contributes to the cooling of the power plant unit. This invention fully utilizes the electrical, cooling, and heating energy generated in the power plant to achieve hydrogen production, storage, and release, avoiding energy waste and reducing hydrogen storage costs. Furthermore, the released hydrogen can better assist in cooling heat-generating components in the power plant, improving the stability and reliability of power plant operation. Attached Figure Description

[0016] Figure 1 This is a system structure diagram of the hydrogen production, storage and supply system based on a power plant according to the present invention.

[0017] In the diagram: 1. Hydrogen production, storage and supply unit; 11. Hydrogen production section; 111. Electrolyzer; 12. Hydrogen storage section; 13. Deoxygenation and drying device; 2. Power plant unit; 21. Generator; 22. Refrigeration unit; 221. Evaporator; 222. First pump body; 223. Chilled water tank; 224. Generator; 225. Absorber; 226. Condenser; 227. Second pump body; 228. Heat exchanger; 229. Third pump body; 220. Expansion valve; 23. Heating unit; 231. Low-pressure economizer; 232. Condenser; 233. Preheater; 234. Fourth pump body; 235. First heater; 236. Second heater; 237. Third heater; 238. Fourth heater; 239. Deaerator; 230. Boiler. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification and the foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification or the foregoing drawings are used to distinguish different objects, and not to describe a particular order, hierarchy, or importance of components.

[0020] It should be noted that, unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention. Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, positioned in a specific orientation such as "horizontal," "vertical," or "suspended," can have an error / deviation of ±10% relative to that orientation, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still fulfill its function in the present invention.

[0021] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0025] To address the technical challenge of high hydrogen storage costs using metal alloys, this invention provides a power plant-based hydrogen production, storage, and supply system. This system organically integrates power plants and hydrogen storage equipment. Hydrogen is generated by electrolyzing brine using electricity from the power plant. The hydrogen is then cooled by the power plant's refrigeration unit, improving the hydrogen storage efficiency and reducing costs. Furthermore, in case of emergency cooling from the power plant, heat can be supplied to the metal alloy via the power plant's heating unit, accelerating the release of hydrogen and allowing more hydrogen to participate in the power plant's cooling process, thus making the power plant's operation more stable and reliable.

[0026] It should be noted that the hydrogen production, storage and supply system based on power plants of the present invention can be applied to thermal power plants, nuclear power plants or hydropower plants, etc. In particular, for hydropower plants, the source of water for hydrogen production is more convenient, while for thermal power plants, the supply of heat energy is more convenient. For ease of explanation, this invention only uses the application of the hydrogen production, storage and supply system based on power plants to thermal power plants as an example. The principle of the hydrogen production, storage and supply system based on power plants applied to other types of power plants is essentially the same as that applied to thermal power plants, and will not be described in detail here.

[0027] like Figure 1 As shown, a preferred embodiment of the present invention provides a hydrogen production, storage and supply system based on a power plant, which includes a hydrogen production, storage and supply unit 1 and a power plant unit 2. The hydrogen production, storage and supply unit 1 includes a hydrogen production section 11 and a hydrogen storage section 12 connected to each other. The hydrogen production section 11 is used to produce hydrogen and transport it to the hydrogen storage section 12 for storage. The power plant unit 2 includes a refrigeration unit 22, a heating unit 23, and a power generation unit 21. The refrigeration unit 22 and the heating unit 23 are respectively connected to the hydrogen storage unit 12. The refrigeration unit 22 and the heating unit 23 are used to provide cold energy and heat energy to the hydrogen storage unit 12 to assist the internal alloy of the hydrogen storage unit 12 in absorbing or releasing hydrogen. The power generation unit 21 is connected to the hydrogen production unit 11 and the hydrogen storage unit 12. The power generation unit 21 is used to provide electrical energy to the hydrogen production unit 11 and to obtain low-temperature hydrogen from the hydrogen storage unit 12 for cooling.

[0028] In this embodiment, the hydrogen production, storage, and supply unit 1 is attached to the power plant. Besides the power generation unit 21, the power plant also includes a cooling unit 22 and a heating unit 23. The cooling unit 22 provides cooling for the generator set and other heat-generating components of the power generation unit 21 to prevent damage caused by excessively high temperatures during power generation, ensuring normal and stable operation of the generator set. This is particularly important in power plants. While hydroelectric power plants can directly utilize natural water for auxiliary cooling, the power plant in this embodiment uses lithium bromide absorption cooling equipment. The cooling unit 22 in this embodiment can provide cooling for both the power generation unit 21 and the metal alloy in the hydrogen storage unit 12, thereby increasing the hydrogen absorption efficiency of the metal alloy, fully utilizing the cooling capacity of the cooling unit 22, and avoiding waste. Furthermore, the hydrogen stored in the metal alloy can be released in situations where the power generation unit 21 requires emergency cooling, assisting the cooling unit 22 in rapidly cooling the power generation unit 21, or cooling the power generation unit 21 when the cooling unit 22 malfunctions and needs maintenance. The heating unit 23 in the power plant can absorb the heat energy generated during the power generation process of the power generation unit 21. For example, in this embodiment, the boiler 230 is used to absorb the excess heat energy generated by the power generation unit 21. In the past, this part of the heat energy was often used in the power plant living area, such as for hot water or other places that need heat energy, or connected to the city's heating system. However, a lot of heat energy was inevitably wasted in this process. In this embodiment, the heating unit 23 can also provide heat energy for the metal alloy in the hydrogen storage unit 12, thereby accelerating the release of hydrogen. It makes full use of the waste heat of the power plant and further avoids the waste of energy. The released hydrogen can be used for the cooling of the power generation unit 21 in the power plant unit 2, or it can be filled into a high-pressure hydrogen storage tank and sold to the outside.

[0029] In one embodiment, please refer to Figure 1 The refrigeration unit 22 includes an evaporator 221, a first pump body 222, and a chilled water tank 223. The evaporator 221, chilled water tank 223, first pump body 222, and hydrogen storage unit 12 are sequentially connected. The hydrogen storage unit 12 is also connected to the evaporator 221. The evaporator 221 is used to deliver chilled water to the chilled water tank 223. The first pump body 222 is used to drive the chilled water in the chilled water tank 223 to flow back to the evaporator 221 through the hydrogen storage unit 12 to absorb the heat released when the hydrogen storage unit 12 absorbs hydrogen.

[0030] Furthermore, the refrigeration unit 22 also includes a generator 224, an absorber 225, a condenser 226, and a second pump body 227. The generator 224 is connected to the heating unit 23, the absorber 225, and the condenser 226. The second pump body 227 is disposed between the absorber 225 and the generator 224. The condenser 226 is connected to the evaporator 221. Generator 224 is used to obtain the heat energy of heating section 23 to supply water vapor and concentrated high-concentration lithium bromide solution to condenser 226 and absorber 225 respectively; condenser 226 is used to cool and condense water vapor and supply condensed low-temperature liquid water to evaporator 221. Evaporator 221 is connected to absorber 225. Evaporator 221 is used to transport low-temperature liquid water that has been vaporized after absorbing heat from chilled water to absorber 225. The second pump 227 is used to draw low-concentration lithium bromide solution from absorber 225 to generator 224.

[0031] Specifically, in this embodiment, the refrigeration unit 22 is a lithium bromide absorption refrigeration device. Its generator 224 stores a lithium bromide solution. The generator 224 is connected to a heating unit 23, which continuously supplies heat energy to the generator 224. Water in the lithium bromide solution continuously vaporizes to form water vapor, while the concentration of the remaining lithium bromide solution continuously increases, eventually forming a high-concentration lithium bromide solution. The water vapor is then transported to a condenser for cooling and condensation, forming high-pressure, low-temperature liquid water. This low-temperature liquid water is then transported to an evaporator 221 for vaporization. The evaporator 221 absorbs a large amount of heat from the chilled water inside to lower its temperature. The cooled chilled water is then transported to the chilled water tank 223 for storage. The first pump 222 can draw chilled water from the chilled water tank 223 to the hydrogen storage section 12 to cool the metal alloy in the hydrogen storage section 12, thereby improving the hydrogen absorption efficiency of the metal alloy. The chilled water that has passed through the hydrogen storage section 12 will flow back to the evaporator 221 and absorb heat again during the vaporization process of low-temperature liquid water. This cycle repeats continuously and stably improves the hydrogen absorption efficiency of the hydrogen storage section 12.

[0032] Furthermore, the high-concentration lithium bromide solution inside generator 224 is transported to absorber 225, while the low-temperature liquid water that absorbs heat and vaporizes in evaporator 221 is also transported to absorber 225 and mixed with the high-concentration lithium bromide solution in absorber 225 to form a low-concentration lithium bromide solution. The low-concentration lithium bromide solution in absorber 225 is then pumped back to generator 224 by second pump 227 for reheating, and water vapor and high-concentration lithium bromide solution are formed again. This cycle repeats, stably lowering the temperature of the chilled water, thereby providing a stable supply of chilled water to hydrogen storage unit 12 for cooling. Of course, it is understood that in some embodiments, chilled water may also be directly transported to power generation unit 21 for cooling via pipeline. The heating of the lithium bromide solution in generator 224 also utilizes the heat energy in heating unit 23, which can also improve the reuse rate of waste heat in the power plant.

[0033] In one embodiment, please refer to Figure 1The refrigeration unit 22 also includes a heat exchanger 228, which is disposed between the generator 224 and the absorber 225. The heat exchanger 228 is used to precool the high-concentration lithium bromide solution supplied by the generator 224 to the absorber 225. Heat exchanger 228 is also used to preheat the low-concentration lithium bromide solution delivered by the second pump body 227 to the generator 224.

[0034] Specifically, in this embodiment, heat exchanger 228 is located between generator 224 and absorber 225. Both high-concentration and low-concentration lithium bromide solutions need to pass through this heat exchanger 228. The high-concentration lithium bromide solution is formed by the vaporization of water molecules due to the heat energy from heating unit 23, so its temperature is relatively high. The temperature difference between it and the low-temperature liquid water returned from evaporator 221 is large, and direct contact could easily lead to uncontrollable factors. Therefore, it needs to be pre-cooled by heat exchanger 228 to lower the temperature of the high-concentration lithium bromide solution. At the same time, the temperature of the mixed low-concentration lithium bromide solution is lower than the temperature inside generator 224. Directly returning the low-concentration lithium bromide solution to generator 224 would also lead to uncontrollable factors and damage generator 224. Therefore, heat exchanger 228 is also needed to preheat the low-concentration lithium bromide solution. In this embodiment, both low-concentration and high-concentration lithium bromide solutions pass through heat exchanger 228 simultaneously. Heat exchanger 228 exchanges heat between the two solutions to reduce the temperature difference, thereby making the operation of the entire refrigeration unit 22 more stable and reliable. The second pump 227 drives the low-concentration lithium bromide solution into generator 224, realizing the circulation of the lithium bromide solution within the refrigeration unit 22.

[0035] In one embodiment, please refer to Figure 1 The refrigeration unit 22 also includes a third pump body 229 and an expansion valve 220. The third pump body 229 is disposed between the condenser 226 and the evaporator 221, and the expansion valve 220 is disposed between the third pump body 229 and the evaporator 221.

[0036] Specifically, in this embodiment, a third pump body 229 and an expansion valve 220 are provided between the condenser 226 and the evaporator 221. The third pump body 229 is used to transport the low-temperature condensate after cooling and condensation in the condenser 226 to the expansion valve 220 and the evaporator 221. When the low-temperature condensate enters the evaporator 221 through the expansion valve 220, it will expand rapidly and vaporize, thereby absorbing a large amount of heat from the chilled water during the vaporization process, thereby reducing the temperature of the chilled water to facilitate the use of the hydrogen storage unit 12.

[0037] In one embodiment, please refer to Figure 1The heating unit 23 includes a low-pressure economizer 231, a condenser 232, a preheater 233, and a fourth pump body 234. The condenser 232, the fourth pump body 234, the preheater 233, and the low-pressure economizer 231 are connected in sequence. The fourth pump body 234 is used to extract low-temperature condensate from the condenser 232 and transport it to the low-pressure economizer 231 through the preheater 233. The low-pressure economizer 231 is used to output heated high-temperature condensate to the preheater 233. The preheater 233 is used to output high-temperature condensate to the hydrogen storage unit 12 and the generator 224.

[0038] Specifically, in this embodiment, the low-pressure economizer 231 is connected to the boiler 230 in the power plant. The fourth pump 234 pumps the low-temperature condensate from the condenser 232 to the preheater 233 for preheating. The preheated low-temperature condensate is then transported to the low-pressure economizer 231 to absorb the temperature of the high-temperature water or gas in the boiler 230, thereby forming high-temperature condensate. The high-temperature condensate is then transported to the preheater 233 to preheat the low-temperature condensate to be input into the low-pressure economizer 231. At the same time, the preheater 233 also transports the high-temperature condensate through pipelines to the hydrogen storage section 12 and the generator 224 respectively to provide heat energy to the hydrogen storage section 12 and the generator 224, thereby accelerating the release rate of hydrogen in the hydrogen storage section 12 and the concentration rate of lithium bromide solution and the steam generation rate in the generator 224. After the high-temperature condensate in the hydrogen storage unit 12 and the generator 224 completes the power supply work, it forms low-temperature condensate. This low-temperature condensate flows back to the preheater 233 and enters the low-pressure economizer 231 through the preheater 233 to be heated again to form high-temperature condensate for subsequent recycling.

[0039] It is understood that although various control valves are not shown in this embodiment and in the illustrations, valves should be provided between the preheater 233, the generator 224, and the hydrogen storage unit 12 to control the flow of high-temperature condensate. Furthermore, different control valves can be installed on the connecting pipes of other components in this application, depending on the specific usage requirements, to control the flow of condensate, water vapor, liquid water, and chilled water.

[0040] In one embodiment, please refer to Figure 1 The heating unit 23 also includes a first heater 235, a second heater 236, a third heater 237, and a fourth heater 238 connected in sequence. The input end of the first heater 235 is connected to the fourth pump body 234, and the output end of the fourth heater 238 is connected to a deaerator 239. The fourth pump body 234 is used to draw condensate from the condenser 232 to the first heater 235, the second heater 236, the third heater 237 and the fourth heater 238. The output terminals of the first heater 235 and the second heater 236 are both connected to the preheater 233 so as to supply condensate to the low-pressure economizer 231 through the preheater 233. The input terminals of the third heater 237 and the fourth heater 238 are both connected to the output terminals of the low-pressure economizer 231 and the generator 224 to receive the condensate output from the low-pressure economizer 231 and the generator 224.

[0041] Specifically, in this embodiment, the heating unit 23 also includes four low-pressure heaters. The low-temperature condensate output by the fourth water pump flows sequentially through the first heater 235, the second heater 236, the third heater 237, and the fourth heater 238 via pipelines, and is finally transported to the deaerator 239 outside the system for treatment. During this process, the low-temperature condensate can be simultaneously transported to the preheater 233 through the output ends of the first heater 235 and the second heater 236, and is finally transported to the low-pressure economizer 231 for heating. This increases the speed at which the low-pressure economizer 231 obtains low-temperature condensate, thereby improving the waste heat reuse efficiency of the boiler 230. A portion of the high-temperature condensate output from the low-pressure economizer 231 is transported to the hydrogen storage unit 12 and the generator 224, while the other portion is transported through pipelines to the third heater 237 and the fourth heater 238, and then discharged to the deaerator 239. Meanwhile, the low-temperature condensate output from the hydrogen storage unit 12 and the generator 224 is also transported to the third heater 237 and the fourth heater 238 and discharged to the external deaerator 239.

[0042] It is understood that in some alternative embodiments, the second heater 236 and the fourth heater 238 can be omitted, while still achieving the above-mentioned technical solution.

[0043] In one embodiment, please refer to Figure 1 The output of the first heater 235 is connected to the condenser 226 to supply low-temperature condensate to the condenser 226. The condenser 226 is connected to the input of the low-pressure economizer 231 to return the low-temperature condensate to the low-pressure economizer 231.

[0044] Specifically, in this embodiment, the low-temperature condensate output from the first heater 235 is not only directly transported to the low-pressure economizer 231 for heating via the preheater 233, but also transported to the condenser 226. The low-temperature condensate absorbs the temperature in the condenser 226, thereby rapidly cooling and condensing the water vapor received from the generator 224 into low-temperature liquid water, which facilitates the cooling and use of the chilled water in the evaporator 221.

[0045] In one embodiment, please refer to Figure 1The hydrogen production unit 11 includes an electrolyzer 111, which is electrically connected to the power generation unit 21. The electrolyzer 111 is used to electrolyze desalinated water to generate hydrogen and oxygen.

[0046] Furthermore, a deoxygenation drying device 13 is provided between the electrolyzer 111 and the hydrogen storage unit 12.

[0047] Specifically, in this embodiment, the hydrogen production unit 11 produces hydrogen by electrolyzing desalinated water. It includes an electrolytic cell 111 for electrolysis, which is powered by the power generation unit 21 of the power station unit 2. Oxygen is transported to other equipment outside the system for processing, while hydrogen is transported to the hydrogen storage unit 12 and stored in a metal alloy for later filling or refrigeration. Since hydrogen is generated by electrolyzing water, it contains a large amount of water molecules and oxygen. Therefore, before storing hydrogen, it needs to be dried and deoxygenated. Thus, a deoxygenation and drying device 13 is provided between the electrolytic cell 111 and the hydrogen storage unit 12.

[0048] To better understand this invention, the following is combined with... Figure 1 The technical solution of the present invention is described below. The embodiments of the present invention provide a hydrogen production, storage and supply system based on a power plant. By organically combining the hydrogen production, storage and supply unit 1 with the power plant unit 2, the system makes full use of the refrigeration unit 22 and the heating unit 23 in the power plant unit 2 to provide cold and heat energy to the hydrogen storage unit 12, thereby accelerating the absorption and release rate of hydrogen. In this process, the excess heat energy of the power plant is fully utilized, which greatly reduces the storage cost of hydrogen. In particular, for the reuse of heat and electricity energy of the power plant at night, the waste of excess electricity and heat energy of the power plant at night is fully avoided.

[0049] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A power plant based hydrogen production, storage and supply system characterized in that, include: A hydrogen production, storage and supply unit, comprising a hydrogen production section and a hydrogen storage section connected together, wherein the hydrogen production section is used to produce hydrogen and deliver it to the hydrogen storage section for storage; The power plant unit includes a refrigeration unit, a heating unit, and a power generation unit. The refrigeration unit and the heating unit are respectively connected to the hydrogen storage unit. The refrigeration unit and the heating unit are used to provide cold energy and heat energy to the hydrogen storage unit to assist the internal alloy of the hydrogen storage unit in absorbing or releasing hydrogen. The power generation unit is connected to the hydrogen production unit and the hydrogen storage unit. The power generation unit is used to provide electrical energy to the hydrogen production unit and to obtain low-temperature hydrogen from the hydrogen storage unit for cooling.

2. The power plant based hydrogen production, storage and supply system in accordance with claim 1, characterized by, The refrigeration unit includes an evaporator, a first pump body, and a chilled water tank. The evaporator, chilled water tank, first pump body, and hydrogen storage unit are sequentially connected. The hydrogen storage unit is also connected to the evaporator. The evaporator is used to supply chilled water to the chilled water tank. The first pump body is used to drive the chilled water in the chilled water tank to flow back to the evaporator through the hydrogen storage unit, so as to absorb the heat released when the hydrogen storage unit absorbs hydrogen.

3. The power plant based hydrogen production, storage and supply system in accordance with claim 2, wherein, The refrigeration unit further includes a generator, an absorber, a condenser, and a second pump body. The generator is connected to the heating unit, the absorber, and the condenser. The second pump body is disposed between the absorber and the generator. The condenser is connected to the evaporator. The generator is used to obtain the heat energy of the heating section to supply water vapor and concentrated high-concentration lithium bromide solution to the condenser and the absorber respectively; the condenser is used to cool and condense the water vapor and supply the condensed low-temperature liquid water to the evaporator. The evaporator is connected to the absorber, and the evaporator is used to transport low-temperature liquid water that has been vaporized after absorbing heat from the chilled water to the absorber. The second pump is used to draw a low-concentration lithium bromide solution from the absorber to the generator.

4. The power plant based hydrogen production, storage and supply system in accordance with claim 3, wherein, The refrigeration unit also includes a heat exchanger, which is disposed between the generator and the absorber, and is used to precool the high-concentration lithium bromide solution supplied by the generator to the absorber; The heat exchanger is also used to preheat the low-concentration lithium bromide solution delivered by the second pump body to the generator.

5. The power plant based hydrogen production, storage and supply system in accordance with claim 4, wherein, The refrigeration unit also includes a third pump body and an expansion valve. The third pump body is disposed between the condenser and the evaporator, and the expansion valve is disposed between the third pump body and the evaporator.

6. The power plant based hydrogen production, storage and supply system in accordance with claim 3, wherein, The heating unit includes a low-pressure economizer, a condenser, a preheater, and a fourth pump body, which are connected in sequence. The fourth pump body is used to extract low-temperature condensate from the condenser and transport it to the low-pressure economizer through the preheater. The low-pressure economizer is used to output heated high-temperature condensate to the preheater, and the preheater is used to output the high-temperature condensate to the hydrogen storage unit and the generator.

7. The power plant based hydrogen production, storage and supply system in accordance with claim 6, wherein, The heating unit also includes a first heater, a second heater, a third heater, and a fourth heater connected in sequence. The input end of the first heater is connected to the fourth pump body, and the output end of the fourth heater is connected to a deaerator. The fourth pump body is used to draw condensate from the condenser to the first heater, the second heater, the third heater and the fourth heater; The output terminals of the first heater and the second heater are both connected to the preheater to supply condensate to the low-pressure economizer through the preheater; The input terminals of the third heater and the fourth heater are both connected to the output terminals of the low-pressure economizer and the generator, respectively, to receive the condensate output by the low-pressure economizer and the generator.

8. The hydrogen production, storage and supply system based on a power plant according to claim 7, characterized in that, The output of the first heater is connected to the condenser to supply condensate to the condenser, and the condenser is connected to the input of the low-pressure economizer to return the condensate to the low-pressure economizer.

9. The hydrogen production, storage, and supply system based on a power plant according to claim 1, characterized in that, The hydrogen production unit includes an electrolyzer electrically connected to the power generation unit. The electrolyzer is used to electrolyze desalinated water to generate hydrogen and oxygen.

10. The hydrogen production, storage, and supply system based on a power plant according to claim 9, characterized in that, An oxygen deoxygenation drying device is provided between the electrolyzer and the hydrogen storage unit.

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