Wind-solar hydrogen production green ammonia synthesis system based on water tank heat storage technology

Abstract

The utility model discloses a wind-solar hydrogen production and green ammonia synthesis system based on a water tank heat storage technology, which comprises a heat storage water tank, and a cold water layer positioned on the lower layer and a hot water layer positioned on the upper layer are arranged in the heat storage water tank; the system further comprises a heat storage pipeline, and a heat storage heat exchanger is arranged in the heat storage pipeline. The system further comprises a heat storage temperature adjusting pipeline, the input end of the heat storage temperature adjusting pipeline is connected with the cold water layer, and the output end of the heat storage temperature adjusting pipeline is connected with the heat storage pipeline. The heat storage heat exchanger is also connected with a synthesis ammonia waste heat steam pipeline; the system further comprises a heat release pipeline, and a heat release heat exchanger is arranged in the heat release pipeline. The system further comprises a heat release temperature adjusting pipeline, the input end of the heat release temperature adjusting pipeline is connected with the cold water layer, and the output end of the heat release temperature adjusting pipeline is connected with the heat release pipeline. The heat release heat exchanger is further connected with a heat exchange circulation pipeline of a downstream application system. Waste heat steam in the ammonia synthesis process is fully utilized, the operation flexibility of the electrolytic bath and the ammonia synthesis device is improved, the energy utilization rate is increased, and energy conservation and carbon reduction are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of wind-solar hydrogen production and green chemical industry, and particularly relates to a wind-solar hydrogen production and green ammonia synthesis system based on water tank heat storage technology. Background Technique

[0002] Different from hydrogen production by fossil energy, the process of wind-solar hydrogen production is clean and pollution-free, and the carbon emission can reach a quite low level. It is the main way encouraged by the hydrogen energy industry in the supply side and is expected to become the most important source of hydrogen production in the future low-carbon era. With the proposal of the dual-carbon goal, the technology of wind-solar hydrogen production and green ammonia synthesis has been gradually taken seriously. It can make full use of clean wind-solar resources, realize cross-industry coupling and carbon reduction in the energy and chemical industries, and is an important technical route for future green chemical industry. Ammonia synthesis mainly adopts the Haber-Bosch process method, which requires high-temperature and high-pressure reaction conditions. In the traditional process, the combustion of fossil fuels is used to provide high-temperature working conditions, while in the process of green hydrogen synthesis of green ammonia, the heat discharged from the ammonia synthesis reaction needs to be used to heat the reaction gas to realize waste heat recycling. In the process of synthesizing green ammonia, the supply of the key raw material gas, green hydrogen, changes with the fluctuation of the wind-solar output, resulting in the fluctuation of the load of synthesizing green ammonia. When operating at low load, the waste heat discharged from the ammonia synthesis process is not enough to heat the reaction gas to the reaction temperature, so additional heat needs to be provided. When operating at high load, the waste heat far exceeds the heat required to preheat the reaction gas, and the excess heat will be wasted. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a wind-solar hydrogen production and green ammonia synthesis system based on water tank heat storage technology, solve the problems such as poor energy utilization efficiency of current ammonia synthesis, take the waste heat steam of ammonia synthesis as the utilization object, adopt water tank heat storage technology for energy storage application, and realize the low-energy consumption operation of the wind-solar hydrogen production and green ammonia synthesis system.

[0004] According to the technical solution of the present utility model, the present utility model provides a wind-solar hydrogen production and synthetic green ammonia system based on water tank heat storage technology, which includes a heat storage water tank. There is a cold water layer located in the lower layer, a hot water layer located in the upper layer, and a transition layer located between the cold water layer and the hot water layer in the heat storage water tank; it also includes a heat storage pipeline. The input end of the heat storage pipeline is connected to the cold water layer of the heat storage water tank, and the output end of the heat storage pipeline is connected to the hot water layer of the heat storage water tank. A heat storage heat exchanger is arranged in the heat storage pipeline; it also includes a heat storage temperature adjustment pipeline. The input end of the heat storage temperature adjustment pipeline is connected to the cold water layer of the heat storage water tank, and the output end of the heat storage temperature adjustment pipeline is connected to the heat storage pipeline on the output side of the heat storage heat exchanger; the heat storage heat exchanger is also connected to the synthetic ammonia waste heat steam pipeline; it also includes a heat release pipeline. The input end of the heat release pipeline is connected to the hot water layer of the heat storage water tank, and the output end of the heat release pipeline is connected to the cold water layer of the heat storage water tank. A heat release heat exchanger is arranged in the heat release pipeline; it also includes a heat release temperature adjustment pipeline. The input end of the heat release temperature adjustment pipeline is connected to the cold water layer of the heat storage water tank, and the output end of the heat release temperature adjustment pipeline is connected to the heat release pipeline on the input side of the heat release heat exchanger; the heat release heat exchanger is also connected to the heat exchange circulation pipeline of the downstream application system; the heat exchange circulation pipeline includes a synthetic ammonia heat exchange device.

[0005] Further, a heat storage circulation pump and a heat storage input shut-off valve are arranged in the heat storage pipeline. The heat storage circulation pump is located on the output side of the connection between the heat storage pipeline and the heat storage temperature adjustment pipeline, and the heat storage input shut-off valve is located on the input side of the heat storage heat exchanger.

[0006] Further, a heat storage temperature adjustment shut-off valve and a heat storage temperature adjustment regulating valve are arranged in the heat storage temperature adjustment pipeline.

[0007] Further, it also includes a direct connection pipeline. The input end of the direct connection pipeline is connected to the output end of the heat storage pipeline, and the output end of the direct connection pipeline is connected to the heat release pipeline on the input side of the heat release heat exchanger.

[0008] Further, it also includes a direct connection pipeline. A heat storage output shut-off valve is arranged in the heat storage pipeline between the heat storage circulation pump and the hot water layer of the heat storage water tank. The input end of the direct connection pipeline is connected to the heat storage pipeline between the heat storage circulation pump and the heat storage output shut-off valve, and the output end of the direct connection pipeline is connected to the heat release pipeline on the input side of the heat release heat exchanger. A direct connection shut-off valve is arranged in the direct connection pipeline.

[0009] Further, a heat release input shut-off valve, a heat release circulation pump and a heat release output shut-off valve are arranged in the heat release pipeline. The heat release input shut-off valve is located on the input side of the connection between the heat release pipeline and the heat release temperature adjustment pipeline, the heat release circulation pump is located between the connection of the heat release pipeline and the heat release temperature adjustment pipeline and the heat release heat exchanger, and the heat release output shut-off valve is located on the output side of the heat release heat exchanger.

[0010] Further, a heat release temperature adjustment shut-off valve and a heat release temperature adjustment regulating valve are arranged in the heat release temperature adjustment pipeline.

[0011] Furthermore, a make-up water pipeline is connected to the cold water layer of the heat storage water tank, and a make-up water pump is arranged in the make-up water pipeline.

[0012] Furthermore, the heat exchange circulation pipeline includes a plurality of parallel branch pipelines. An application system device is arranged in each branch pipeline. The application system device includes a synthetic ammonia heat exchange device, and the application system device further includes a heating heater and / or a shutdown electrolyzer.

[0013] Furthermore, a heat exchange circulation water pump is arranged in the heat exchange circulation pipeline; a branch pipeline shut-off valve is respectively arranged in each branch pipeline, and a branch pipeline regulating valve is further arranged in the branch pipelines where the heating heater and the shutdown electrolyzer are located.

[0014] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0015] After the synthetic ammonia system is started and operates at a high load, a large amount of heat is generated during the synthetic ammonia reaction. Cold water in the heat storage water tank is introduced into the heat exchanger to absorb heat and generate high-temperature hot water. The circulation pump is turned on to pump the hot water into the upper layer of the heat storage water tank for storage. When the temperature of the heated water is too high, in order to balance the transition layer in the heat preservation water pipe, part of the cold water needs to be provided by the bypass to adjust the temperature.

[0016] When supplying heat to the downstream, the circulation pump and the shut-off valve of the heat release loop of the heat storage water tank are turned on. The working medium circulating water downstream is heated through the heat exchanger. The temperature of the water releasing heat decreases and is pumped back to the cold water layer of the heat storage water tank by the circulation pump. The downstream circulating water carries heat and is sent to the heat user. When the heat user has a lower temperature requirement, the temperature control adjustment bypass of the heat storage water tank can be opened to mix part of the cold water to adjust the temperature.

[0017] When the synthetic ammonia system operates at a low load, heat is provided by the heat storage water tank to maintain the synthetic ammonia reaction temperature, and the heat supply is controlled by adjusting the hot water flow of each downstream heat user branch.

[0018] In the system of this solution, when the synthetic ammonia tower operates at a high load, no redundant waste heat steam is discarded. When operating at a low load, the heat required for heat preservation can be provided by the heat storage system. The electrolyzer can maintain the hot standby state by using the reaction heat of synthetic ammonia, and the remaining heat can be partially supplied to the outside. This system makes full use of the waste heat steam of synthetic ammonia, realizes reasonable regulation of waste heat through heat storage in the water tank, and reduces energy waste. This system reduces external heat consumption, improves energy utilization rate, reduces carbon emissions, and realizes energy conservation and carbon reduction. Moreover, this system sets heat storage in the water tank to flexibly adjust the heat supply, improves the operation flexibility of the electrolyzer and the synthetic ammonia device, and ensures the safe and stable operation of the electrolytic hydrogen production system and the synthetic ammonia system. Description of the Drawings

[0019] Figure 1It is a schematic structural diagram of a system according to an embodiment of the present utility model.

[0020] Explanation of reference numerals in the drawings:

[0021] 1. Heat storage water tank; 11. Cold water layer; 12. Hot water layer; 13. Transition layer; 2. Heat storage pipeline; 21. Heat storage heat exchanger; 22. Synthetic ammonia waste heat steam pipeline; 23. Heat storage circulation pump; 24. Heat storage input shut-off valve; 25. Heat storage output shut-off valve; 3. Heat storage temperature regulation pipeline; 31. Heat storage temperature regulation shut-off valve; 32. Heat storage temperature regulation control valve; 4. Heat release pipeline; 41. Heat release heat exchanger; 42. Heat release input shut-off valve; 43. Heat release circulation pump; 44. Heat release output shut-off valve; 5. Heat release temperature regulation pipeline; 51. Heat release temperature regulation shut-off valve; 52. Heat release temperature regulation control valve; 6. Heat exchange circulation pipeline; 61. Synthetic ammonia heat exchange device; 62. Heating heater; 63. Shutdown electrolytic cell; 64. Heat exchange circulation water pump; 7. Direct connection pipeline; 71. Direct connection shut-off valve; 8. Make-up water pipeline; 81. Make-up water pump. Detailed implementation manners

[0022] The present utility model provides a wind-solar hydrogen production and synthetic green ammonia system based on water tank heat storage technology, and more specifically, a water tank heat storage system for steam waste heat in a wind-solar hydrogen production and synthetic green ammonia project, which solves problems such as poor energy utilization efficiency of current synthetic ammonia, uses synthetic ammonia waste heat steam as the utilization object, adopts water tank heat storage technology for energy storage applications, and realizes low-energy consumption operation of the wind-solar hydrogen production and synthetic green ammonia system; that is, in wind-solar hydrogen production and synthetic green ammonia, water tank heat storage technology is used to store the waste heat generated during the synthetic ammonia process, which is used to supplement the heat gap during its low-load operation and external heating, realizes flexible heat regulation, reduces waste, and saves energy and reduces carbon emissions.

[0023] Please refer to Figure 1 , a wind-solar hydrogen production and synthetic green ammonia system based on water tank heat storage technology according to an embodiment of the present utility model mainly includes a green hydrogen production system, an ammonia synthesis system, and a water tank heat storage system. The water tank heat storage system includes a heat storage water tank 1. The heat storage water tank 1 is a heat-insulated tank body. Inside the heat storage water tank 1, there is a cold water layer 11 located at the lower layer, a hot water layer 12 located at the upper layer, and a transition layer 13 located between the cold water layer 11 and the hot water layer 12. Further, the cold water layer 11 of the heat storage water tank 1 is also connected to a make-up water pipeline 8, and a make-up water pump 81 is provided in the make-up water pipeline 8 for supplementing water to the heat storage water tank 1 as needed.

[0024] It also includes a heat storage pipeline 2. The input end of the heat storage pipeline 2 is connected to the cold water layer 11 of the heat storage water tank 1, and the output end of the heat storage pipeline 2 is connected to the hot water layer 12 of the heat storage water tank 1. A heat storage heat exchanger 21 is provided in the heat storage pipeline 2. It also includes a heat storage temperature adjustment pipeline 3. The input end of the heat storage temperature adjustment pipeline 3 is connected to the cold water layer 11 of the heat storage water tank 1, and the output end of the heat storage temperature adjustment pipeline 3 is connected to the heat storage pipeline 2 on the output side of the heat storage heat exchanger 21. The heat storage heat exchanger 21 is also connected to the synthetic ammonia waste heat steam pipeline 22. Among them, components such as the heat storage pipeline 2 form a heat storage loop for the heat storage process of this system. The heat storage heat exchanger 21 has two heat exchange channels, which are respectively used for the passage of the gas in the synthetic ammonia waste heat steam pipeline 22 and the liquid in the heat storage pipeline 2, so as to realize the heat exchange process between the two. The excess heat generated during the high-load operation of the synthetic ammonia plant is transferred to the cold water in the heat storage water tank 1 through the heat storage heat exchanger 21. The shut-off valve and the circulation pump are opened, and the cold water absorbs heat and then enters the hot water layer of the heat storage water tank 1. The heat storage temperature adjustment pipeline 3 is used to adjust the temperature of the hot water flowing into the hot water layer 12 of the heat storage water tank 1 during the heat storage process.

[0025] The heat storage loop stores the heat released by the synthetic ammonia reaction. The heat storage input shut-off valve 24, the heat storage heat exchanger 21, the heat storage circulation pump 23, the heat storage output shut-off valve 25, and the heat storage water tank 1 form a heat storage loop to store the heat of the synthetic ammonia waste heat steam in the hot water layer 12 of the heat storage water tank 1. Among them, the heat storage temperature is controlled by the heat storage circulation pump 23 and the heat storage temperature adjustment control valve 32. Shut-off valves are configured to control the heat storage process of the heat storage water tank.

[0026] It also includes a heat release pipeline 4. The input end of the heat release pipeline 4 is connected to the hot water layer 12 of the heat storage water tank 1, and the output end of the heat release pipeline 4 is connected to the cold water layer 11 of the heat storage water tank 1. A heat release heat exchanger 41 is provided in the heat release pipeline 4. It also includes a heat release temperature adjustment pipeline 5. The input end of the heat release temperature adjustment pipeline 5 is connected to the cold water layer 11 of the heat storage water tank 1, and the output end of the heat release temperature adjustment pipeline 5 is connected to the heat release pipeline 4 on the input side of the heat release heat exchanger 41. The heat release heat exchanger 41 is also connected to the heat exchange circulation pipeline 6 of the downstream application system (downstream heat user). Among them, components such as the heat release pipeline 4 form a heat release loop for the heat release process of this system. The heat release temperature adjustment pipeline 5 is used to adjust the temperature of the hot water output from the heat storage water tank 1 during the heat release process. The heat release heat exchanger 41 has two heat exchange channels, which are respectively used for the passage of the liquid in the heat exchange circulation pipeline 6 and the liquid in the heat release pipeline 4, so as to realize the heat exchange process between the two.

[0027] The heat release loop is for downstream heat users. The heat storage water tank 1, heat release input shut-off valve 42, heat release circulation pump 43, heat release heat exchanger 41, and heat release output shut-off valve 44 form the heat release loop. The hot working medium flows out from the upper layer of the heat storage water tank 1, and the cooled working medium after heat release returns to the lower layer of the heat storage water tank 1. The heat release loop supplies heat to the downstream ammonia synthesis heat exchange device 61, heating heater 62, and shutdown electrolyzer 63. Among them, the heat supply temperature is controlled by the heat release circulation pump 43 and the heat release temperature regulating valve 52. Shut-off valves are configured to control the heat release process of the heat storage water tank.

[0028] The ammonia synthesis system includes an ammonia synthesis reaction tower, an ammonia synthesis heat exchange device 61, an ammonia synthesis waste heat steam pipeline 21, etc. When the ammonia synthesis system operates at high load, a large amount of waste heat is generated, and this part of the heat is stored by the water tank heat storage system. The heat exchange circulation pipeline 6 at least includes the ammonia synthesis heat exchange device 61. The green hydrogen production system includes an electrolyzer that utilizes wind and solar power generation, etc. Preferably, the heat exchange circulation pipeline 6 includes multiple parallel branch pipelines, and each branch pipeline is provided with an application system device. The application system device includes the ammonia synthesis heat exchange device 61, and the application system device also includes a heating heater 62 and / or a shutdown electrolyzer 63. Further, a heat exchange circulation water pump 64 is provided in the heat exchange circulation pipeline 6; a branch pipeline shut-off valve is respectively provided in each branch pipeline, and a branch pipeline regulating valve is also provided in the branch pipelines where the heating heater 62 and the shutdown electrolyzer 63 are located. In this way, the waste heat is used for heating and the insulation of the electrolyzer, etc., to further utilize the waste heat and improve the energy utilization rate of green hydrogen ammonia synthesis from multiple aspects.

[0029] More specifically, a heat storage circulation pump 23 (such as a variable frequency circulation pump) and a heat storage input shut-off valve 24 are provided in the heat storage pipeline 2. The heat storage circulation pump 23 is located on the output side of the connection between the heat storage pipeline 2 and the heat storage temperature regulating pipeline 3, and the heat storage input shut-off valve 24 is located on the input side of the heat storage heat exchanger 21. The heat storage circulation pump 23 is used to drive the flow of the working medium. A heat storage temperature regulating shut-off valve 31 and a heat storage temperature regulating valve 32 are provided in the heat storage temperature regulating pipeline 3. Further, the heat storage input shut-off valve 24 is located downstream of the heat storage temperature regulating pipeline 3. In this way, a relatively concise structure and a more convenient and controllable operation process are achieved.

[0030] Preferably, a direct connection pipeline 7 is further included. The input end of the direct connection pipeline 7 is connected to the output end of the heat storage pipeline 2, and the output end of the direct connection pipeline 7 is connected to the heat release pipeline 4 on the input side of the heat release heat exchanger 41. More specifically, a heat storage output shut-off valve 25 is provided in the heat storage pipeline 2 between the heat storage circulation pump 23 and the hot water layer 12 of the heat storage water tank 1. The input end of the direct connection pipeline 7 is connected to the heat storage pipeline 2 between the heat storage circulation pump 23 and the heat storage output shut-off valve 25, and the output end of the direct connection pipeline 7 is connected to the heat release pipeline 4 on the input side of the heat release heat exchanger 41. A direct connection shut-off valve 71 is provided in the direct connection pipeline 7. By configuring the direct connection pipeline 7 and the direct connection shut-off valve 71, the working medium heated by the heat storage heat exchanger 21 can be directly sent to the heat release heat exchanger 41 for heat release, reducing part of the heat storage process, and further improving the energy utilization rate and control efficiency in some cases.

[0031] Similarly, a heat release input shut-off valve 42, a heat release circulation pump 43 (such as a variable frequency circulation pump), and a heat release output shut-off valve 44 are provided in the heat release pipeline 4. The heat release input shut-off valve 42 is located on the input side at the connection of the heat release pipeline 4 and the heat release temperature adjustment pipeline 5. The heat release circulation pump 43 is located between the connection of the heat release pipeline 4 and the heat release temperature adjustment pipeline 5 and the heat release heat exchanger 41. The heat release output shut-off valve 44 is located on the output side of the heat release heat exchanger 41. The heat release circulation pump 43 is used to drive the flow of the working medium. A heat release temperature adjustment shut-off valve 51 and a heat release temperature adjustment control valve 52 are provided in the heat release temperature adjustment pipeline 5.

[0032] The main concept and principle of the present utility model are as follows.

[0033] The water tank heat storage technology stores and releases heat through the stratification principle of water. At different water temperatures, the density of water is different. In the heat preservation tank body, hot water is on the upper layer, cold water is on the lower layer, and there is a transition layer in the middle. During heat storage, hot water flows into the upper region of the heat storage water tank 1, and cold water is discharged from the bottom of the heat storage water tank 1. During heat release, hot water is discharged and sent to the heat user. During the operation of the heat storage water tank 1 (during heat storage and release), there is water loss, and the make-up water pump 81 is used to supplement water to maintain the water volume balance and stability of the system.

[0034] Specifically, since the synthesis of ammonia is an exothermic reaction, its waste heat can generate steam, and this part of the heat is stored and utilized. After the ammonia synthesis system is started and operates at high load, a large amount of heat is generated during the ammonia synthesis reaction. Cold water in the heat storage water tank is introduced into the heat exchanger to absorb heat and generate high-temperature hot water. The circulation pump is turned on to pump the hot water into the upper layer of the heat storage water tank for storage. When the temperature of the heated water is too high, in order to balance the transition layer in the heat preservation water pipe, it is necessary to provide part of the cold water through the bypass to adjust the temperature.

[0035] When supplying heat to the downstream, open the circulation pump and shut-off valve of the heat release circuit of the hot water storage tank, heat the downstream working medium circulating water through the heat exchanger, reduce the temperature of the water that releases heat, and send it back to the cold water layer of the storage tank by the circulation pump. The downstream circulating water carries the heat to the heat user. When the heat user has a lower temperature requirement, the temperature control bypass of the hot water storage tank can be opened to mix some cold water to adjust the temperature.

[0036] The heat stored in the hot water storage tank 1 comes from the waste heat steam generated in the process of wind and solar hydrogen production and ammonia synthesis. The heat storage temperature of the water tank is lower than 100°C, and the heat exchange medium is hot water. The heat of the ammonia synthesis heat exchange device 61, the shutdown electrolyzer 63 and the heating heater 62 all come from the heat release heat exchanger 41. The working fluid water after heat release flows to the heat exchange circulation water pump 64 to provide power for the working fluid circulation.

[0037] Energy saving and consumption reduction can be achieved by storing waste heat in hot water storage tanks and rationally allocating the heat stored in the hot water storage tanks. In addition to synthetic ammonia, the electrolyzer needs to be kept above 50°C when it is shut down to ensure a faster startup speed and thus improve the utilization rate of wind and solar power generation. Waste heat can be used to maintain the temperature of the shut-down electrolyzer.

[0038] The electrolytic cell and the ammonia synthesis tower are both connected to the exothermic heat exchanger 41. When the ammonia synthesis reaction tower of the ammonia synthesis system is running at a low load, heat is preferentially provided to the ammonia synthesis heat exchange device 61 to maintain the ammonia synthesis reaction temperature to improve the flexibility of the ammonia synthesis system. The heat supply is controlled by the regulating valve in the corresponding branch pipeline. At the same time, the heat supply is controlled by adjusting the hot water flow rate of each downstream heat user branch. For example, the water tank heat storage system also provides heat for the shut-down electrolytic cell 63 (i.e., the electrolytic cell in the shut-down state) to maintain its hot standby state. The heat supply is controlled by the regulating valve in the corresponding branch pipeline; the residual heat of the water tank heat storage system can be used for heating and other scenarios. The shut-off valves in the downstream application system are used to control the flow direction of the heat exchange medium.

[0039] The preferred working mode of the present utility model is as follows.

[0040] When the ammonia synthesis unit is operating at high load and the heating heater 62 and the shutdown electrolytic cell 63 require heat, the thermal storage water tank 1 stores and releases heat simultaneously. The heat storage circuit and the heat release circuit are opened, and the direct connection shut-off valve 71 is opened at the same time to directly send part of the heat into the heat release circuit. When the ammonia synthesis unit is operating at high load and the heating heater 62 and the shutdown electrolytic cell 63 do not require heat, only the heat storage circuit is opened for heat storage. When the ammonia synthesis unit is operating at low load and the heating heater 62 and the shutdown electrolytic cell 63 do not require heat, the heat release circuit is opened and the shut-off valves of the branch pipelines where the heating heater 62 and the shutdown electrolytic cell 63 are located are closed. The shut-off valve and the regulating valve of the branch pipeline where the ammonia synthesis heat exchange device 61 is located are opened to supply heat to the ammonia synthesis heat exchange device 61. When the ammonia synthesis unit is operating at low load and both the heating heater 62 and the shutdown electrolytic cell 63 require heat, the heat release circuit and the shut-off valves and regulating valves of each branch pipeline are opened, and the three branch pipelines supply heat simultaneously.

[0041] To sum up, in the system of this solution, when the ammonia synthesis tower is operating at high load, the excess waste heat steam is no longer discarded. When operating at low load, the heat required for heat preservation can be provided by the heat storage system. The electrolytic cell can maintain the hot standby state by using the reaction heat of ammonia synthesis, and the remaining heat can be partially supplied to the outside. This system makes full use of the waste heat steam of ammonia synthesis, realizes the reasonable regulation of waste heat through the heat storage of the water tank, and reduces energy waste. This system reduces the external heat consumption, improves the energy utilization rate, reduces carbon emissions, and realizes energy conservation and carbon reduction. In addition, this system sets the water tank to store heat and flexibly adjust the heat supply, improves the operation flexibility of the electrolytic cell and the ammonia synthesis unit, and ensures the safe and stable operation of the electrolytic hydrogen production system and the ammonia synthesis system.

Claims

1. A wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology, characterized in that: The invention comprises a hot water storage tank (1), wherein the hot water storage tank (1) comprises a cold water layer (11) at the lower layer, a hot water layer (12) at the upper layer, and a transition layer (13) between the cold water layer (11) and the hot water layer (12); It also includes a heat storage pipeline (2), the input end of the heat storage pipeline (2) is connected to the cold water layer (11) of the hot water storage tank (1), the output end of the heat storage pipeline (2) is connected to the hot water layer (12) of the hot water storage tank (1), and a heat storage heat exchanger (21) is arranged in the heat storage pipeline (2); it also includes a heat storage temperature regulating pipeline (3), the input end of the heat storage temperature regulating pipeline (3) is connected to the cold water layer (11) of the hot water storage tank (1), and the output end of the heat storage temperature regulating pipeline (3) is connected to the heat storage pipeline (2) at the output side of the heat storage heat exchanger (21); the heat storage heat exchanger (21) is also connected to the synthetic ammonia waste heat steam pipeline (22); The heat release system further comprises a heat release pipeline (4), the input end of which is connected to the hot water layer (12) of the hot water storage tank (1), the output end of which is connected to the cold water layer (11) of the hot water storage tank (1), and a heat release heat exchanger (41) is arranged in the heat release pipeline (4); and a heat release temperature regulating pipeline (5), the input end of which is connected to the cold water layer (11) of the hot water storage tank (1), and the output end of which is connected to the heat release pipeline (4) at the input side of the heat release heat exchanger (41); the heat release heat exchanger (41) is also connected to a heat exchange circulation pipeline (6) of a downstream application system; and the heat exchange circulation pipeline (6) comprises a synthetic ammonia heat exchange device (61).

2. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to claim 1 is characterized in that: A heat storage circulation pump (23) and a heat storage input shutoff valve (24) are provided in the heat storage pipeline (2); the heat storage circulation pump (23) is located on the output side of the connection between the heat storage pipeline (2) and the heat storage temperature regulating pipeline (3); and the heat storage input shutoff valve (24) is located on the input side of the heat storage heat exchanger (21).

3. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to claim 1 is characterized in that: A heat storage and temperature regulation shut-off valve (31) and a heat storage and temperature regulation valve (32) are arranged in the heat storage and temperature regulation pipeline (3).

4. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to claim 1 is characterized in that: It also includes a direct connection pipeline (7), the input end of the direct connection pipeline (7) is connected to the output end of the heat storage pipeline (2), and the output end of the direct connection pipeline (7) is connected to the heat release pipeline (4) on the input side of the heat release heat exchanger (41).

5. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to claim 2 is characterized in that: The invention also comprises a direct connection pipeline (7), wherein a heat storage output shutoff valve (25) is provided in the heat storage pipeline (2) between the heat storage circulation pump (23) and the hot water layer (12) of the hot water storage tank (1), the input end of the direct connection pipeline (7) is connected to the heat storage pipeline (2) between the heat storage circulation pump (23) and the heat storage output shutoff valve (25), the output end of the direct connection pipeline (7) is connected to the heat release pipeline (4) on the input side of the heat release heat exchanger (41), and a direct connection shutoff valve (71) is provided in the direct connection pipeline (7).

6. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to claim 1 is characterized in that: The heat release pipeline (4) is provided with a heat release input shutoff valve (42), a heat release circulation pump (43) and a heat release output shutoff valve (44); the heat release input shutoff valve (42) is located at the input side of the connection between the heat release pipeline (4) and the heat release temperature regulating pipeline (5); the heat release circulation pump (43) is located between the connection between the heat release pipeline (4) and the heat release temperature regulating pipeline (5) and the heat release heat exchanger (41); and the heat release output shutoff valve (44) is located at the output side of the heat release heat exchanger (41).

7. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to claim 1 is characterized in that: The exothermic temperature regulating pipeline (5) is provided with an exothermic temperature regulating shut-off valve (51) and an exothermic temperature regulating valve (52).

8. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to any one of claims 1 to 7, characterized in that: The cold water layer (11) of the hot water storage tank (1) is also connected to a water replenishment pipeline (8), and a water replenishment pump (81) is provided in the water replenishment pipeline (8).

9. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to any one of claims 1 to 7, characterized in that: The heat exchange circulation pipeline (6) includes a plurality of branch pipelines connected in parallel, each branch pipeline is provided with an application system device, the application system device includes a synthetic ammonia heat exchange device (61), and the application system device also includes a heating heater (62) and / or a shutdown electrolytic cell (63).

10. The wind-solar hydrogen production and green ammonia synthesis system based on water tank thermal storage technology according to claim 9 is characterized in that: A heat exchange circulation water pump (64) is provided in the heat exchange circulation pipeline (6); each branch pipeline is provided with a branch pipeline shut-off valve, and the branch pipelines where the heating heater (62) and the shutdown electrolytic cell (63) are located are also provided with branch pipeline regulating valves.

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