A method for heating the electrolyte for hydrogen production by electrolyzing water by using the waste heat of green ammonia production

Abstract

The present invention discloses a method for heating the electrolyte for hydrogen production by electrolyzing water using the waste heat from green ammonia production, belonging to the technical field of environmental protection utilization of green ammonia. Specifically, it includes a renewable energy power system, a hydrogen production system by electrolyzing water, and a synthetic ammonia system. The present invention utilizes the internal and external conical barrels of heat storage and related circulation structures to extract the heat-conducting oil with reduced temperature at the bottom and return it for temperature increase, improving the uneven thermal distribution, and being able to continuously and stably supply heat to the alkali addition tank of the hydrogen system and the alkali addition tank of the oxygen system, ensuring the heat supply demand of the green ammonia production system at critical stages; enhancing the energy utilization rate, and by means of a layer temperature feeding rack and a high-temperature seasoning valve group, accurately extracting heat-conducting oils at different layers, realizing accurate heat output and regulation, and improving the waste heat utilization efficiency in the green ammonia production process.

Description

Technical Field

[0001] The present invention relates to the technical field of green ammonia environmental protection utilization, and specifically provides a method for heating electrolyzed water for hydrogen production electrolyte by using the waste heat of green ammonia production. Background Art

[0002] In recent years, with the emphasis on environmental protection and sustainable development, the development of renewable energy power has been rapid. However, due to the volatility and intermittency of renewable energy power, a large number of phenomena of abandoned wind and solar power have emerged. Hydrogen, as an efficient and environmentally friendly energy storage medium, can locally consume renewable energy power. Currently, the flexible electrolyzed water for hydrogen production load can be as low as 10%, achieving efficient utilization of renewable energy power. However, due to problems such as low safety and difficult storage and transportation of hydrogen, it is difficult to be widely applied. Green ammonia, as a downstream product of the green hydrogen industrial chain, has the characteristics of high safety and low storage and transportation costs, and has become an important energy carrier for end-use energy equipment such as new energy vehicles.

[0003] The technical route of green power - green hydrogen - green ammonia is an important path for locally consuming renewable energy power. In areas rich in wind and solar resources, the annual available hours of wind and solar power usually exceed 3000 hours. In areas with relatively rich wind and solar resources such as Xinjiang Uygur Autonomous Region and Inner Mongolia Autonomous Region, the green ammonia production process is provided by renewable energy power.

[0004] However, considering economic factors and other factors, the system usually needs to be shut down at night when there is no wind and solar power. Considering that the temperature is relatively low at night in the northwest border areas rich in wind and solar resources, in order to prevent the electrolyte in the electrolyzed water for hydrogen production system from freezing, the electrolyte usually needs to be electrically heated for a long time to keep warm at night. When the electrolyzer starts electrolysis again, the temperature of the electrolyte needs to be raised to 60 - 70 degrees, with a long start-up time and high energy consumption, greatly increasing the operating cost.

[0005] Figure 11 For the four traditional hot oil storage methods, namely tank thermal storage, pool thermal storage, buried pipe thermal storage, and aquifer thermal storage, there are all cases of eccentric thermal distribution. Among them, tank thermal storage is a commonly used thermal storage method in chemical industries such as green ammonia production. Affected by the thermal flow convergence, the thermal energy at the top of the tank is highly concentrated, resulting in the rapid penetration and external dissipation of the thermal energy of the tank or the concentration of thermal energy, causing unstable output heat sources, and making the green ammonia production system insufficient in heating the alkali addition tanks for large-area / multiple hydrogen systems and oxygen systems before the long-term arrival of wind and solar power.

[0006] In view of the above technical defects, a solution is now proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for heating electrolyzed water for hydrogen production electrolyte by using the waste heat of green ammonia production to solve the problems raised.

[0008] To achieve the above object, the present invention provides the following technical solution: A method for heating the electrolyte for hydrogen production by electrolyzing water using the waste heat of green ammonia production, including a renewable energy power system, an electrolytic water hydrogen production system, and a synthetic ammonia system. The method steps for the combined operation of multiple systems are as follows:

[0009] Renewable energy acquisition: The electric energy generated by one or more of wind energy, light energy, water energy, biomass energy, geothermal energy, and ocean energy in renewable energy is converted into the electric power required for the hydrogen production and synthetic ammonia systems through an inverter, a transformer, and a controller.

[0010] Electrolytic hydrogen production stage: The gas generated by the electrolytic cell reaction in the electrolytic water hydrogen production system is processed by a gas-liquid separation system and a purification system, and the obtained high-purity hydrogen is stored in a hydrogen tank. The hydrogen tank is connected to the synthetic ammonia system to provide hydrogen raw materials for the synthetic ammonia system.

[0011] Hydrogen and ammonia feeding stage: The synthetic ammonia system includes a raw material preparation unit, a gas purification and compression unit, an ammonia synthesis unit, an ammonia separation and recovery unit, a circulation and tail gas treatment unit, and a waste heat recovery unit. The waste heat recovery unit exchanges heat with the high-temperature raw material gas after being processed by the synthesis tower unit through heat transfer oil and stores the recovered heat in a heat storage tank. Part of it is used for heat preservation and heating during the long-term shutdown and cold start of the electrolytic cell for hydrogen production by electrolyzing water.

[0012] Furthermore, a heat storage outer cone barrel is arranged inside the heat storage tank, a heat storage inner cone barrel is arranged inside the heat storage outer cone barrel, an inner feeding rack penetrates through the bottom of the heat storage inner cone barrel, a high-temperature seasoning valve group sleeved on the outer wall of the heat storage inner cone barrel is embedded on one end barrel wall of the heat storage outer cone barrel, a layer temperature feeding rack connected to the inner wall of the heat storage tank is arranged on the other end barrel wall of the heat storage outer cone barrel, a low-temperature conveying valve connected to the layer temperature feeding rack pipeline is arranged on the outer wall of the heat storage tank, and several groups of heat exchange units are arranged on the outer periphery of the heat storage tank.

[0013] Furthermore, a slanted groove facing the high-temperature seasoning valve group is arranged in a groove on the outer wall of one end of the heat storage inner cone barrel. A group of outer connection ports penetrate through the middle layer and the top layer inside the slanted groove. A tray is arranged at the bottom of the heat storage inner cone barrel. Several groups of annularly arrayed inner filter pumping ports are arranged on the inner wall of the top of the outer side of the tray. A slag discharge port close to the inner feeding rack penetrates through the bottom of the tray. A high-temperature resistant pump machine connected to the inner filter pumping ports and an outer reflux pipe pipeline is embedded in the inner side wall of the tray.

[0014] Further, a middle layer pumping rack is sleeved on the inner wall of the middle layer of the heat storage inner conical barrel, and a top layer pumping rack with the same structure as the middle layer pumping rack is arranged on the inner wall of the top layer of the heat storage inner conical barrel. A plurality of groups of filtering racks attached to the inner wall of the heat storage inner conical barrel are arranged at the bottom of the middle layer pumping rack. Built-in pipelines connected to the external connection ports are arranged on the racks of the middle layer pumping rack and the top layer pumping rack.

[0015] Further, a support socket is arranged at the bottom of the inner feeding rack. An external reflux pipe with a limit clamped at the central part inside the heat storage inner conical barrel is arranged in the middle of the support socket. An inner conveying pipe is sleeved inside the external reflux pipe. An overflow port communicating with the inner conveying pipe and the heat storage inner conical barrel is arranged on the outer wall at the top of the external reflux pipe. The bottom of the external reflux pipe is inserted into the middle of the tray and connected to a high-temperature pump.

[0016] Further, a conical chamber is arranged between the heat storage outer conical barrel and the heat storage inner conical barrel. The high-temperature seasoning valve group is provided with a support pipe inclined rack clamped inside the conical chamber. A plurality of groups of partition ring plates sleeved inside the conical chamber are arranged on the inner wall of the support pipe inclined rack. Secondary heat injection ports close to the partition ring plates are arranged on the surfaces of the two side racks of the support pipe inclined rack. A first material pipe penetrating through the support pipe inclined rack and connected to the secondary heat injection port is arranged at the outer top of the high-temperature seasoning valve group. A second material pipe penetrating through the support pipe inclined rack and connected to the external connection port is arranged at the outer bottom of the high-temperature seasoning valve group.

[0017] Further, a moving slide is arranged between the inner walls of multiple groups of the layer temperature material taking racks. A cylinder inclined rack connected to the moving slide is embedded on the inner wall of the layer temperature material taking rack. A telescopic electric valve facing the heat storage outer conical barrel is arranged on the inner wall of the moving slide. A high-temperature resistant telescopic pipe connected to the telescopic electric valve and the low-temperature conveying valve pipeline is arranged at the bottom of the moving slide. A hot air blower is arranged at the top of the moving slide.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention extracts the high-temperature heat-conducting oil with reduced temperature at the bottom of the heat storage inner conical barrel through the inner filtering and pumping port, and makes it flow back to the top for temperature increase, avoiding the concentration of heat at the top of the tank body, effectively improving the uneven heat distribution condition, ensuring relatively balanced temperatures at all parts of the heat storage system, and solving the problem of eccentric heat distribution.

[0020] 2. Aiming at the problem of highly concentrated heat at the top caused by the flow and convergence of heat in the tank-type heat storage, the present invention constructs a heat source between the heat storage inner conical barrel and the heat storage outer conical barrel to reduce the temperature loss of the internal high-temperature heat-conducting oil and stabilize the heat distribution in the heat storage tank; before the long-term arrival of wind and photovoltaic power, it can continuously and stably supply heat to a large area / multiple hydrogen system caustic addition tanks and oxygen system caustic addition tanks, ensure the heat supply demand of the green ammonia production system in the critical stage, avoid the decline in production efficiency or production stagnation caused by insufficient heat supply, and stabilize heat storage and heat supply.

[0021] 3. The present invention adopts multi-level temperature-locking protection measures. For example, a heat storage cavity is arranged between the interior of the heat storage tank and the outer conical barrel of the heat storage, which collects the dissipated high-temperature heat, effectively reduces the rate of heat dissipation to the outside, improves the heat storage efficiency, reduces energy waste, enables more heat to be used in the relevant links of green ammonia production, enhances the energy utilization rate of the entire production system, and reduces the external dissipation and loss of heat energy.

[0022] 4. The present invention utilizes a layer temperature feeding rack to extract high-temperature heat-conducting oil in different-level conical chambers as needed. The high-temperature seasoning valve group can be connected to the middle-layer or top-layer feeding rack according to the required extraction temperature to accurately extract high-temperature heat-conducting oil at different levels in the inner conical barrel of the heat storage. The accurate heat output and regulation method ensure that the heat source temperature provided for the green ammonia production system is stable and appropriate, meeting the precise requirements for heat during the production process, and contributing to improving the quality and stability of green ammonia production.

[0023] 5. In order to reduce the overall energy consumption of electrolytic water hydrogen production and improve the energy utilization efficiency, the present invention proposes to use the waste heat generated by the ammonia synthesis reaction to preheat the electrolytic cell, which can effectively solve the problem that traditional electrolytic cells rely on electric heating during long-term shutdown and cold start. It not only avoids the disadvantages of long cold start time and high energy consumption, but also realizes the recycling of the waste heat of ammonia synthesis, achieving the dual benefits of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is the overall method flow chart of the present invention;

[0026] Figure 2 It is the three-dimensional schematic diagram of the overall structure of the present invention;

[0027] Figure 3 It is the structural schematic diagram of the heat storage tank of the present invention;

[0028] Figure 4 It is the structural schematic diagram of the inner conical barrel of the heat storage of the present invention;

[0029] Figure 5 It is the structural schematic diagram of the inner feeding rack and the tray of the present invention;

[0030] Figure 6 It is the structural schematic diagram of the inner feeding rack of the present invention;

[0031] Figure 7This is a schematic structural diagram of the heat storage outer cone barrel and the layer temperature material taking rack of the present invention;

[0032] Figure 8 This is a schematic structural diagram of the layer temperature material taking rack of the present invention;

[0033] Figure 9 This is a schematic structural diagram of the high-temperature seasoning valve group of the present invention;

[0034] Figure 10 This is a schematic connection diagram of the electrolytic cell and the synthesis tower of the present invention;

[0035] Figure 11 This is a schematic diagram of four traditional hot oil storage methods of the present invention.

[0036] Reference numerals: 1, heat storage tank; 2, heat exchange unit; 3, low-temperature transfer valve; 4, heat storage outer cone barrel; 5, heat storage inner cone barrel; 501, external connection port; 502, tray; 503, internal filter pumping port; 504, middle layer material taking rack; 505, top layer material taking rack; 506, slag discharge port; 6, internal feeding rack; 601, support sleeve seat; 602, external reflux pipe; 603, internal conveying pipe; 7, layer temperature material taking rack; 701, cylinder inclined rack; 702, moving slide seat; 703, telescopic electric valve; 704, high-temperature resistant telescopic pipe; 8, high-temperature seasoning valve group; 801, support pipe inclined rack; 802, secondary heat injection port; 803, partition ring plate. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1: Please refer to Figure 1 - Figure 11 As shown, this embodiment is a method for heating the electrolyte for electrolytic water hydrogen production by using the waste heat of green ammonia production, including a renewable energy power system, an electrolytic water hydrogen production system, and a synthetic ammonia system. The method steps for the combined operation of multiple systems are as follows:

[0039] Renewable energy acquisition: The electric energy generated by using one or more of wind energy, light energy, water energy, biomass energy, geothermal energy, and ocean energy in renewable energy is converted into the electric power required for the hydrogen production and synthetic ammonia system through an inverter, a transformer, and a controller;

[0040] Electrolytic hydrogen production stage: The gas generated by the electrolytic water hydrogen production system in the electrolytic cell is processed by the gas-liquid separation system and the purification system, and the obtained high-purity hydrogen is stored in the hydrogen tank. The hydrogen tank is connected to the ammonia synthesis system to provide hydrogen raw materials for the ammonia synthesis system;

[0041] Hydrogen-ammonia feeding stage: The ammonia synthesis system includes a raw material preparation unit, a gas purification and compression unit, an ammonia synthesis unit, an ammonia separation and recovery unit, a circulation and tail gas treatment unit, and a waste heat recovery unit. The waste heat recovery unit exchanges heat with the high-temperature raw gas after being processed by the synthesis tower unit through heat-conducting oil, and stores the recovered heat in the heat storage tank 1. Part of the heat is used for heat preservation and heating treatment when some of the electrolytic cells for electrolytic water hydrogen production are in long-term shutdown and cold start.

[0042] Among them, a heat storage outer cone barrel 4 is arranged inside the heat storage tank 1, a heat storage inner cone barrel 5 is arranged inside the heat storage outer cone barrel 4, an inner feeding rack 6 is arranged through the bottom of the heat storage inner cone barrel 5, a high-temperature seasoning valve group 8 sleeved on the outer wall of the heat storage inner cone barrel 5 is embedded on one end barrel wall of the heat storage outer cone barrel 4, a layer temperature feeding rack 7 connected to the inner wall of the heat storage tank 1 is arranged on the other end barrel wall of the heat storage outer cone barrel 4, a low-temperature conveying valve 3 connected to the pipeline of the layer temperature feeding rack 7 is arranged on the outer wall of the heat storage tank 1, and several groups of heat exchange units 2 are arranged on the outer periphery of the heat storage tank 1.

[0043] The green ammonia production process is all provided by renewable energy electricity. The heat generated by the ammonia synthesis waste heat recovery system is used to heat the electrolytic solution for electrolytic water hydrogen production, significantly reducing the energy consumption of the electrolytic cell during night heat preservation and cold start, thereby improving the energy utilization efficiency.

[0044] On the outer wall of one end of the heat storage inner cone barrel 5, a slotted groove is arranged with a slant groove facing the high-temperature seasoning valve group 8. A group of outer connection ports 501 are arranged through the middle layer and the top layer inside the slant groove. A tray 502 is arranged at the bottom of the heat storage inner cone barrel 5. Several groups of inner filter pumping ports 503 arranged in an annular array are arranged on the inner wall at the top of the outer side of the tray 502. A slag discharge port 506 close to the inner feeding rack 6 is arranged through the bottom of the tray 502. A high-temperature resistant pump machine connected to the pipeline of the inner filter pumping port 503 and the outer return pipe 602 is embedded in the inner wall on the side of the tray 502;

[0045] A middle layer pumping rack 504 is sleeved on the inner wall of the middle layer of the heat storage inner cone barrel 5. A top layer pumping rack 505 with the same structure as the middle layer pumping rack 504 is arranged on the inner wall of the top layer of the heat storage inner cone barrel 5. Several groups of filtering racks attached to the inner wall of the heat storage inner cone barrel 5 are arranged at the bottom of the middle layer pumping rack 504. Built-in pipelines connected to the outer connection ports 501 are arranged on the racks of the middle layer pumping rack 504 and the top layer pumping rack 505.

[0046] A support socket 601 is provided at the bottom of the internal injection rack 6. An outer reflux pipe 602 is provided in the middle of the support socket 601, and the outer reflux pipe 602 is limited and clamped at the center inside the heat storage inner conical barrel 5. An inner delivery pipe 603 is sleeved inside the outer reflux pipe 602. An overflow port communicating with the inner delivery pipe 603 and the heat storage inner conical barrel 5 is provided on the outer wall at the top of the outer reflux pipe 602. The bottom of the outer reflux pipe 602 is inserted into the middle of the tray 502 and is connected to a high-temperature resistant pump. The heat exchange base group 2 includes multiple groups of heat exchangers a, b, and c provided on the outer periphery of the heat storage tank 1.

[0047] The high-temperature heat-conducting oil is transported through the heat exchanger a to the inner delivery pipe 603, and is guided by the inner delivery pipe 603 to enter the heat storage inner conical barrel 5 along the overflow port. During the accumulation of the high-temperature heat-conducting oil in the heat storage inner conical barrel 5, part of the high-temperature heat-conducting oil deposited at the bottom of the heat storage inner conical barrel 5 is extracted by the inner filter pumping port 503, and under the action of the high-temperature resistant pump, it is transported into the outer reflux pipe 602, promoting the high-temperature heat-conducting oil with reduced temperature at the bottom of the heat storage inner conical barrel 5 to flow back to the top cover of the heat storage inner conical barrel 5. Combining the heat accumulated at the top of the heat storage inner conical barrel 5, it is heated, and at the same time, the impurities in the high-temperature heat-conducting oil are filtered and retained on the tray 502, thereby reducing the extraction of impurities in the high-temperature heat-conducting oil by the middle-layer pumping rack 504 and the top-layer pumping rack 505, and reducing the blockage effect on the inner wall of the oil pipe in the overall system.

[0048] The specific plan for waste heat recovery treatment is as follows: In the case of long periods without wind and photovoltaic power at night, etc., low-temperature water is exchanged through the heat exchanger, and through the action of the circulation pump, it circulates in the water circulation channel of the alkali addition tank to maintain the electrolyte temperature at 10 degrees to ensure that the electrolyte does not freeze.

[0049] When wind and photovoltaic power come, hot water is exchanged through the heat exchanger and circulates in the alkali addition tank through the action of the circulation pump. At the same time, the alkali liquid circulation pump is started to heat the electrolyte in the electrolytic cell and the alkali addition tank to 60 degrees and start electrolysis. When electrolysis starts, the hot water circulation heating is stopped.

[0050] The high-temperature synthesis gas generated in the ammonia synthesis reaction is exchanged with low-temperature heat-conducting oil through the heat exchanger a, and the generated waste heat is stored in the heat storage tank 1 in the form of high-temperature heat-conducting oil. When there is a heat demand at the back end, the high-temperature heat-conducting oil is exchanged with the refrigerant medium through the heat exchange base to achieve efficient utilization of heat.

[0051] When the electrolyzer is in a long-term shutdown state, to prevent the electrolyte temperature from being too low, heat preservation measures will be taken. The high-temperature heat-conducting oil in the heat storage tank 1 is exchanged with the water in the water tank through heat exchanger b, and 20-degree low-temperature water is exchanged. During the heat exchange process, the exchanged low-temperature heat-conducting oil enters the low-temperature heat-conducting oil storage tank and continues to be used as the refrigerant medium of heat exchanger a. The low-temperature water enters the water circulation channels of the hydrogen system alkali addition tank and the oxygen system alkali addition tank through the circulation pump respectively, heats the electrolyte in the alkali tank. After the heat exchange between the low-temperature water and the electrolyte in the alkali tank, it returns to the water tank through the circulation pump again.

[0052] Before the long-term arrival of wind and solar power, the high-temperature heat-conducting oil in the heat storage tank 1 is exchanged with the water in the water tank through heat exchanger b, and 75-degree hot water is exchanged. During the heat exchange process, the exchanged low-temperature heat-conducting oil enters the low-temperature heat-conducting oil storage tank and continues to be used as the refrigerant medium of heat exchanger a. The hot water enters the hot water circulation channels of the hydrogen system alkali addition tank and the oxygen system alkali addition tank through the circulation pump respectively, heats the electrolyte in the alkali tank. At the same time, the alkali liquid circulation pump is started to heat the electrolyte in the electrolyzer and the alkali addition tank to 60 degrees and start electrolysis. When electrolysis starts, the hot water circulation heating is stopped. After the heat exchange between the hot water and the electrolyte in the alkali tank, it returns to the water tank through the circulation pump again.

[0053] As Figure 10 shown, a hot water circulation channel is arranged inside the electrolyte storage tanks at the hydrogen evolution end and the oxygen evolution end. To prevent uneven heating of the electrolyte in the storage tank, the channel structure is of a coil type. The hot water inlet is connected to the pump outlet. The hot water is transported by the pump to the internal pipelines of the two alkali addition tanks and then returns to the water tank through the outlet after heat exchange. The waste heat generated during the green ammonia production process is supplied to the electrolytic water hydrogen production unit. When there is no power, it ensures the electrolyte temperature. The heat-conducting oil is used as the energy storage for the waste heat of ammonia synthesis. In the case of long-term absence of wind and solar power, to prevent the electrolyte temperature from being too low, a disc-shaped hot water circulation channel is arranged inside the electrolyte storage tank, and the waste heat generated by the ammonia synthesis reaction is used to heat the front-end electrolyte. The implementation of this scheme significantly reduces the overall power consumption of electrolytic water hydrogen production, improves the utilization efficiency of the waste heat of ammonia synthesis, and achieves the purpose of energy conservation and emission reduction.

[0054] Example 2: Please refer to Figure 2 - Figure 9As shown in the figure, this embodiment is a method for heating the electrolyte for electrolytic water hydrogen production by using the waste heat of green ammonia production. A conical chamber is arranged between the heat storage outer conical barrel 4 and the heat storage inner conical barrel 5. The high-temperature seasoning valve group 8 is provided with a support pipe inclined frame 801 clamped inside the conical chamber. A number of partition ring plates 803 sleeved inside the conical chamber are arranged on the inner wall of the support pipe inclined frame 801. Secondary heat injection ports 802 close to the partition ring plates 803 are arranged on the surfaces of the two side frames of the support pipe inclined frame 801. A first material pipe penetrating through the support pipe inclined frame 801 and connected to the secondary heat injection port 802 is arranged at the top outside the high-temperature seasoning valve group 8. A second material pipe penetrating through the support pipe inclined frame 801 and connected to the external connection port 501 is arranged at the bottom outside the high-temperature seasoning valve group 8.

[0055] The high-temperature seasoning valve group 8 is connected to the pipeline of heat exchanger b through the second material pipe. According to the required extraction temperature, by means of the regulating valve arranged inside the support pipe inclined frame 801, the connection between the second material pipe and the middle layer extraction frame 504 or the top layer extraction frame 505 is maintained, so as to extract the high-temperature heat-conducting oil stored at different levels inside the heat storage inner conical barrel 5. Affected by the rising and aggregation of heat, the heat content of the high-temperature heat-conducting oil at different levels inside the heat storage inner conical barrel 5 also varies.

[0056] The high-temperature seasoning valve group 8 shunts and conveys a part of the high-temperature heat-conducting oil in heat exchanger a to the conical chamber through the first material pipe. A part of the high-temperature heat-conducting oil is guided in the conical chamber through the secondary heat injection port 802, and a heat source is constructed between the heat storage inner conical barrel 5 and the heat storage outer conical barrel 4, effectively reducing the temperature loss of the high-temperature heat-conducting oil inside the heat storage inner conical barrel 5. Affected by the different heat loss efficiencies of the high-temperature heat-conducting oil at different levels inside the heat storage inner conical barrel 5, the heat consumption of the high-temperature heat-conducting oil in the conical chamber also varies, increasing sequentially from top to bottom.

[0057] A moving slide 702 is arranged between the inner walls of the multi-group layer temperature extraction frame 7. A cylinder inclined frame 701 connected to the moving slide 702 is embedded on the inner wall of the layer temperature extraction frame 7. A telescopic electric valve 703 facing the heat storage outer conical barrel 4 is arranged on the inner wall of the moving slide 702. A high-temperature resistant telescopic pipe 704 connected to the telescopic electric valve 703 and the low-temperature conveying valve 3 pipeline is arranged at the bottom of the moving slide 702. A hot air blower is arranged at the top of the moving slide 702.

[0058] The layer temperature extraction frame 7 is connected to the moving slide 702 through the cylinder inclined frame 701 and drives the moving slide 702 to slide up and down obliquely. When approaching the docking valve arranged in the outer wall area of the corresponding heat storage outer conical barrel 4, the cylinder inside the telescopic electric valve 703 operates, prompting the telescopic electric valve 703 to expand and dock with the docking valve, so as to extract and convey the high-temperature heat-conducting oil in the conical chamber at this level for external transportation, and convey it to the relevant step area according to the required temperature application.

[0059] There is a certain heat storage cavity between the interior of the heat storage tank 1 and the outer heat storage conical barrel 4, which is used to collect the high-temperature heat dissipated from the outer heat storage conical barrel 4, so as to achieve multi-stage temperature locking protection for the high-temperature heat-conducting oil from the inside to the outside. At the same time, according to the usage requirements, the hot air inside the heat storage cavity can be extracted by a hot air blower. An air inlet valve is arranged on the outer wall of the heat storage tank 1, and it needs to be electrically opened.

[0060] Combining Embodiment 1 and Embodiment 2, it can be seen that the present invention effectively solves the traditional heat storage problem through unique structures and measures. By using the inner and outer heat storage conical barrels and related circulation structures, the heat-conducting oil with lost temperature at the bottom is extracted and returned for temperature increase, improving the uneven thermal distribution. A heat source is constructed between the two conical barrels to stabilize the heat distribution, ensuring heat supply during the key stage of green ammonia production. Moreover, through multi-stage temperature locking such as the arranged heat storage cavity, the outward dissipation of heat energy is reduced, the energy utilization rate is improved, and with the help of the layer temperature material taking rack 7 and the high-temperature seasoning valve group 8, the heat-conducting oil at different levels is accurately extracted to achieve accurate heat output and regulation, improving the quality and stability of green ammonia production.

[0061] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications, supplements, or use similar methods to replace the specific embodiments described, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

[0062] In the implementation of this solution, heat-conducting oil is used for heat storage. The heat-conducting oil has a wide liquid range, operates in a liquid state under normal pressure, does not require high-pressure containers, the system is simple and reliable, can respond quickly (the heat conduction coefficient is about 0.1 - 0.2 W / m·K), and can achieve minute-level heat response. However, it is not limited to this, and specific adjustments are made according to actual use.

[0063] The above-disclosed preferred embodiments of the present invention are only used to help illustrate the present invention. The preferred embodiments do not elaborate on all details, nor do they limit the invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the art of this technology can well understand and utilize the present invention. The present invention is only limited by the claim book and its full scope and equivalents.

Claims

1. A method for heating the electrolyte for hydrogen production by electrolyzing water using the waste heat of green ammonia production, comprising a renewable energy power system, a hydrogen production system by electrolyzing water, and a synthetic ammonia system, characterized in that, The method steps for the combined operation of multiple systems are as follows: Renewable energy acquisition: The electric energy generated by using one or more of wind energy, light energy, water energy, biomass energy, geothermal energy, and ocean energy in renewable energy is converted into the electric power required for the hydrogen production and ammonia synthesis system through an inverter, a transformer, and a controller. Hydrogen production by electrolysis stage: The gas generated by the electrolytic water hydrogen production system through the electrolytic cell reaction is processed by a gas-liquid separation system and a purification system, and the obtained high-purity hydrogen is stored in a hydrogen tank. The hydrogen tank is connected to the ammonia synthesis system to provide hydrogen raw materials for the ammonia synthesis system. Hydrogen and ammonia feeding stage: The ammonia synthesis system includes a raw material preparation unit, a gas purification and compression unit, an ammonia synthesis unit, an ammonia separation and recovery unit, a circulation and tail gas treatment unit, and a waste heat recovery unit. The waste heat recovery unit exchanges heat with the high-temperature raw gas after being processed by the synthesis tower unit through heat transfer oil and stores the recovered heat in a heat storage tank (1). Part of it is used for heat preservation and heating treatment when some of the electrolytic cells for electrolytic water hydrogen production are in long-term shutdown and cold start. A heat storage outer cone barrel (4) is arranged inside the heat storage tank (1), and a heat storage inner cone barrel (5) is arranged inside the heat storage outer cone barrel (4). An inner feeding rack (6) penetrates through the bottom of the heat storage inner cone barrel (5). A high-temperature seasoning valve group (8) sleeved on the outer wall of the heat storage inner cone barrel (5) is embedded on one end barrel wall of the heat storage outer cone barrel (4). A layer temperature sampling rack (7) connected to the inner wall of the heat storage tank (1) is arranged on the other end barrel wall of the heat storage outer cone barrel (4). A middle layer pumping rack (504) is sleeved on the inner wall of the middle layer of the heat storage inner cone barrel (5), and a top layer pumping rack (505) with the same structure as the middle layer pumping rack (504) is arranged on the inner wall of the top layer of the heat storage inner cone barrel (5). A conical chamber is arranged between the heat storage outer cone barrel (4) and the heat storage inner cone barrel (5). By using the layer temperature sampling rack (7) to extract high-temperature heat transfer oil in different layers of the conical chamber as needed, the high-temperature seasoning valve group (8) is connected to the middle layer or the top layer pumping rack (505) according to the extraction temperature requirement to accurately extract high-temperature heat transfer oil in different layers inside the heat storage inner cone barrel (5).

2. According to the method for heating the electrolytic solution for electrolytic water hydrogen production by using the waste heat of green ammonia production as described in claim 1, a low-temperature conveying valve (3) connected to the pipeline of the layer temperature sampling rack (7) is arranged on the outer wall of the heat storage tank (1), and several groups of heat exchange units (2) are arranged on the outer periphery of the heat storage tank (1).

3. A method for heating the electrolyte for hydrogen production by electrolyzing water using the waste heat of green ammonia production according to claim 2, characterized in that, A slant groove facing the high-temperature seasoning valve group (8) is arranged in a groove on one end outer wall of the heat storage inner cone barrel (5). A group of outer connection ports (501) penetrate through both the middle layer and the top layer inside the slant groove. A tray (502) is arranged at the bottom of the heat storage inner cone barrel (5). Several groups of inner filter pumping ports (503) arranged in an annular array are arranged on the inner wall of the top of the outer side of the tray (502). A slag discharge port (506) close to the inner feeding rack (6) penetrates through the bottom of the tray (502).

4. A method for heating the electrolyte for hydrogen production by electrolyzing water using the waste heat of green ammonia production according to claim 3, characterized in that, A plurality of groups of suction filter racks are arranged at the bottom of the middle layer material extraction rack (504) and are attached to the inner wall of the heat storage inner conical barrel (5). Built-in pipelines connected to the outer connection port (501) are arranged on the racks of the middle layer material extraction rack (504) and the top layer material extraction rack (505).

5. A method for heating the electrolyte for hydrogen production by electrolyzing water using the waste heat of green ammonia production according to claim 2, characterized in that, A support sleeve base (601) is arranged at the bottom of the inner material injection rack (6). An outer reflux pipe (602) which is limited and clamped at the center inside the heat storage inner conical barrel (5) is arranged in the middle of the support sleeve base (601). An inner delivery pipe (603) is sleeved inside the outer reflux pipe (602).

6. A method for heating the electrolyte for hydrogen production by electrolyzing water using the waste heat of green ammonia production according to claim 2, characterized in that, The high-temperature seasoning valve group (8) is provided with a support pipe inclined frame (801) clamped inside the conical chamber. A plurality of groups of partition ring plates (803) sleeved inside the conical chamber are arranged on the inner wall of the support pipe inclined frame (801). Secondary heat injection ports (802) close to the partition ring plates (803) are arranged on the surfaces of the two side frames of the support pipe inclined frame (801).

7. A method for heating the electrolyte for hydrogen production by electrolyzing water using the waste heat of green ammonia production according to claim 3, characterized in that, A movable slide base (702) is arranged between the inner walls of multiple groups of layer temperature material extraction racks (7). A cylinder inclined frame (701) connected to the movable slide base (702) is embedded on the inner wall of the layer temperature material extraction rack (7). A telescopic electric valve (703) facing the heat storage outer conical barrel (4) is arranged on the inner wall of the movable slide base (702). A high-temperature resistant telescopic pipe (704) which is pipeline-connected to the telescopic electric valve (703) and the low-temperature delivery valve (3) is arranged at the bottom of the movable slide base (702).

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