Method for heating electrolyzed water to produce hydrogen electrolyte by using green ammonia production waste heat

Abstract

The invention discloses a method for heating water electrolysis hydrogen production electrolyte by using green ammonia production waste heat, belongs to the technical field of green ammonia environment-friendly utilization, and particularly relates to a renewable energy power system, a water electrolysis hydrogen production system and a synthesis ammonia system. The heat storage inner cone barrel, the heat storage outer cone barrel and a related circulation structure are utilized, heat loss heat conduction oil at the bottom is extracted to flow back and raise the temperature, uneven heat distribution is improved, heat can be continuously and stably supplied to a hydrogen system alkali adding tank and an oxygen system alkali adding tank, and the heat supply requirement of a green ammonia production system in the key stage is met; and by means of a layer temperature material taking frame and a high-temperature material mixing valve set, heat conduction oil of different layers is accurately extracted, accurate output, regulation and control of heat are achieved, and the waste heat utilization efficiency in the green ammonia production process is improved.

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 the electrolyte for electrolytic water hydrogen production by using the waste heat of green ammonia production. Background Art

[0002] In recent years, with the increasing emphasis on environmental protection and sustainable development, the development of renewable energy power has been booming. However, due to the volatility and intermittency of renewable energy power, a large amount of wind and solar power abandonment has occurred. Hydrogen, as an efficient and environmentally friendly energy storage medium, can locally consume renewable energy power. Currently, the flexible electrolytic water hydrogen production load can be as low as 10%, achieving the 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 all provided by renewable energy power;

[0004] However, considering economic factors and other aspects, 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 electrolytic water 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, resulting in 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 - type heat storage, pool - type heat storage, buried pipe heat storage, and aquifer heat storage, there are all cases of eccentric thermal distribution. Among them, tank - type heat storage is a commonly used heat storage method in chemical industries such as green ammonia production. Affected by the thermal flow aggregation, the heat is highly concentrated at the top of the tank, causing the heat energy of the tank to rapidly penetrate and dissipate externally or the heat energy to be concentrated, resulting in unstable output heat sources. Therefore, before the long - term arrival of wind and solar power, the green ammonia production system has insufficient heat supply for large - area / multiple hydrogen systems and oxygen system alkali addition tanks.

[0006] In view of the above - mentioned 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 the electrolyte for electrolytic water hydrogen production 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 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:

[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 treatment when some of the electrolytic cells for electrolytic water hydrogen production are in long-term shutdown and cold start.

[0012] Further, 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 frame is arranged 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 sampling frame 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 sampling frame 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] Further, a slant 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 slant 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 frame 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 delivery pipe is sleeved inside the external reflux pipe. An overflow port communicating with the inner delivery 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. A support pipe inclined rack clamped inside the conical chamber is arranged on the high-temperature seasoning valve group. 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 delivery 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 filtration 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 the relative balance of the temperatures of 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 heat flow collection 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, collecting the dissipated high-temperature heat, effectively reducing the rate of heat dissipation to the outside, improving the heat storage efficiency, reducing energy waste, enabling more heat to be used in the relevant links of green ammonia production, enhancing the energy utilization rate of the entire production system, and reducing heat dissipation and loss to the outside.

[0022] 4. The present invention utilizes a layer temperature material taking 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 material taking rack according to the required extraction temperature, accurately extracting the 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. 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 material injection rack and the tray of the present invention;

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

[0031] Figure 7Schematic diagram of the heat storage outer conical barrel and the layer temperature material taking rack of the present invention;

[0032] Figure 8 Schematic diagram of the layer temperature material taking rack of the present invention;

[0033] Figure 9 Schematic diagram of the high-temperature seasoning valve group of the present invention;

[0034] Figure 10 Schematic diagram of the connection between the electrolytic cell and the synthesis tower of the present invention;

[0035] Figure 11 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 conical barrel; 5, heat storage inner conical barrel; 501, external connection port; 502, tray; 503, internal filter pumping port; 504, middle layer pumping rack; 505, top layer pumping rack; 506, slag discharge port; 6, internal feeding rack; 601, support socket; 602, external return pipe; 603, internal delivery pipe; 7, layer temperature material taking rack; 701, cylinder inclined rack; 702, moving slide; 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. Specific embodiments

[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 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 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 transfer oil, and stores the recovered heat in the heat storage tank 1. Part of the heat is used for heat preservation and heating during the long-term shutdown and cold start of the electrolytic cell for electrolytic water hydrogen production.

[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 pipeline-connected to 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 powered by renewable energy electricity, and 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 provided with an inclined 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 inclined 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 is arranged through the bottom of the tray 502. A high-temperature resistant pump machine pipeline-connected to the inner filter pumping ports 503 and the outer return pipe 602 is embedded in the inner wall of 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 charging rack 6. An external reflux pipe 602 with a limit clamped at the center inside the heat storage inner cone barrel 5 is provided in the middle of the support socket 601. An internal delivery pipe 603 is sleeved inside the external reflux pipe 602. An overflow port communicating with the internal delivery pipe 603 and the heat storage inner cone barrel 5 is provided on the outer wall at the top of the external reflux pipe 602. The bottom of the external reflux pipe 602 is inserted into the middle of the tray 502 and connected to a high-temperature resistant pump. The heat exchange unit 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 piped through the heat exchanger a and guided into the internal delivery pipe 603. The internal delivery pipe 603 guides it to enter the heat storage inner cone barrel 5 along the overflow port. During the accumulation of the high-temperature heat-conducting oil in the heat storage inner cone barrel 5, part of the high-temperature heat-conducting oil deposited at the bottom of the heat storage inner cone barrel 5 is extracted by the internal filter suction port 503. Under the action of the high-temperature resistant pump, it is transported into the external reflux pipe 602, promoting the return of the high-temperature heat-conducting oil with reduced temperature at the bottom of the heat storage inner cone barrel 5 to the top cover of the heat storage inner cone barrel 5. Combining with the heat accumulated at the top of the heat storage inner cone 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 extraction rack 504 and the top-layer extraction 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 circulated in the water circulation channel of the alkali addition tank through the action of the circulation pump 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 circulated 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 electrolyzer 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 unit 2 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 photovoltaic 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 electrolysis begins. 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, hot water circulation channels are 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 tanks, the channel structure is in the form of coiled pipes. 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 production process of green ammonia is supplied to the electrolytic water hydrogen production unit. When there is no power, it ensures the electrolyte temperature. 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 photovoltaic power, to prevent the electrolyte temperature from being too low, a disk-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 Two: Please refer to Figure 2 - Figure 9As shown, this embodiment is a method for utilizing waste heat from green ammonia production to heat an electrolyte for producing hydrogen by electrolyzing water, comprising a conical chamber provided between a heat storage outer conical barrel 4 and a heat storage inner conical barrel 5, a high-temperature regulating valve group 8 provided with a support tube inclined frame 801 clamped in the conical chamber, a plurality of groups of partition rings 803 sleeved in the conical chamber are provided on the inner wall of the support tube inclined frame 801, secondary hot injection ports 802 close to the partition rings 803 are provided on the surface of the frames on both sides of the support tube inclined frame 801, a material pipe 1 penetrating the support tube inclined frame 801 and connected to the secondary hot injection port 802 is provided on the outer top of the high-temperature regulating valve group 8, and a material pipe 2 penetrating the support tube inclined frame 801 and connected to the external connection port 501 is provided on the outer bottom of the high-temperature regulating valve group 8.

[0055] The high-temperature regulating valve group 8 is connected to the pipeline of the heat exchanger b through the material pipe 2. According to the extraction temperature requirements, the material pipe 2 is kept connected to the middle-level extraction rack 504 or the top-level extraction rack 505 through the regulating valve arranged inside the support pipe inclined frame 801. Based on this, the high-temperature heat transfer oil stored in different levels inside the heat storage inner cone barrel 5 is extracted. Due to the influence of the rising and gathering of heat, the heat content of the high-temperature heat transfer oil in different levels inside the heat storage inner cone barrel 5 is also different.

[0056] The high-temperature regulating valve group 8 is used to divert part of the high-temperature heat transfer oil in the heat exchanger a through the material pipe 1 and transport it to the conical chamber, and part of the high-temperature heat transfer oil is guided into the conical chamber through the secondary heat injection port 802, and a heat source is constructed between the heat storage inner cone barrel 5 and the heat storage outer cone barrel 4, which effectively reduces the temperature loss of the high-temperature heat transfer oil inside the heat storage inner cone barrel 5. Due to the different temperature loss efficiencies of the high-temperature heat transfer oil at different levels inside the heat storage inner cone barrel 5, the heat consumption of the high-temperature heat transfer oil in the conical chamber is also different, which increases from top to bottom.

[0057] A movable slide 702 is arranged between the inner walls of multiple groups of layer temperature material taking racks 7, a cylinder inclined frame 701 connected to the movable slide 702 is embedded on the inner wall of the layer temperature material taking rack 7, a telescopic electric valve 703 facing the heat storage outer cone barrel 4 is arranged on the inner wall of the movable slide 702, a high temperature resistant telescopic pipe 704 connected to the telescopic electric valve 703 and the low temperature delivery valve 3 pipeline is arranged at the bottom of the movable slide 702, and a hot air blower is arranged on the top of the movable slide 702.

[0058] The layer temperature material taking rack 7 is connected to the movable slide 702 through the cylinder inclined rack 701, and drives the movable slide 702 to slide up and down. When it is close to the docking valve set in the outer wall area of ​​the corresponding heat storage outer cone barrel 4, the cylinder inside the telescopic electric valve 703 runs, prompting the telescopic electric valve 703 to expand and dock with the docking valve, which is used to extract and transport the high-temperature heat transfer oil in the layered cone chamber to the relevant step area according to the temperature application requirements;

[0059] There is a certain heat storage cavity between the interior of the heat storage tank 1 and the heat storage outer conical barrel 4, which is used to collect the high-temperature heat dissipated from the heat storage outer 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 provided 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. Additionally, through multi-stage temperature locking such as the provided heat storage cavity, the outward dissipation of thermal energy is reduced, the energy utilization rate is increased, 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 or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should fall within 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 thermal conductivity coefficient is about 0.1 - 0.2 W / m·K), can achieve minute-level heat response, and is not limited to this, and is specifically adjusted according to actual use.

[0063] The above-disclosed preferred embodiments of the present invention are only used to help explain the present invention. The preferred embodiments do not elaborate on all the details, nor do they limit the invention to only the specific implementation manners. Obviously, many modifications and changes can be made according to the content of this specification. 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 electrolyte for hydrogen production by water electrolysis using waste heat from green ammonia production, comprising a renewable energy power system, a water electrolysis hydrogen production system and an ammonia synthesis system, characterized in that: The steps for multi-system joint operation are as follows: Renewable energy acquisition: Utilize one or more of the renewable energy sources such as wind energy, light energy, water energy, biomass energy, geothermal energy and ocean energy to generate electricity, and convert it into electricity required by the hydrogen production and ammonia synthesis system through inverters, transformers and controllers; Electrolysis hydrogen production stage: The gas produced by the electrolytic cell reaction in the water electrolysis hydrogen production system is processed by the gas-liquid separation system and the purification system. The obtained high-purity hydrogen is stored in the hydrogen tank, which is connected to the synthetic ammonia system to provide hydrogen raw materials for the synthetic ammonia system; 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 gas treated by the synthesis tower unit through heat transfer oil, and stores the recovered heat in a heat storage tank (1). Some electrolytic cells used for hydrogen production by electrolysis of water are in long-term shutdown and cold start-up for heat preservation and heating treatment.

2. The method of utilizing waste heat from green ammonia production to heat electrolyte for hydrogen production by water electrolysis according to claim 1, characterized in that: The heat storage tank (1) is provided with a heat storage outer cone barrel (4) inside, and a heat storage inner cone barrel (5) is provided inside the heat storage outer cone barrel (4). An inner filling rack (6) is provided through the bottom of the heat storage inner cone barrel (5). A high-temperature regulating valve group (8) is embedded on the barrel wall at one end of the heat storage outer cone barrel (4) and is sleeved with the outer wall of the heat storage inner cone barrel (5). A layer temperature taking rack (7) connected to the inner wall of the heat storage tank (1) is provided on the barrel wall at the other end of the heat storage outer cone barrel (4).

3. According to the method for utilizing waste heat from green ammonia production to heat electrolyte for producing hydrogen by electrolysis of water as claimed in claim 2, a low-temperature delivery valve (3) connected to a pipeline of a layer temperature material taking rack (7) is arranged on the outer wall of the heat storage tank (1), and a plurality of heat exchange units (2) are arranged on the outer periphery of the heat storage tank (1).

4. The method of utilizing waste heat from green ammonia production to heat electrolyte for hydrogen production by water electrolysis according to claim 2, characterized in that: A groove on the outer wall at one end of the heat storage inner cone barrel (5) is provided with an inclined groove facing the high-temperature regulating valve group (8), and a group of external connection ports (501) are provided through the middle layer and the top layer inside the inclined groove. A tray (502) is provided at the bottom of the heat storage inner cone barrel (5), and a plurality of groups of inner filter extraction ports (503) arranged in a circular array are provided on the inner wall of the outer top of the tray (502). A slag discharge port (506) close to the inner injection frame (6) is provided through the bottom of the tray (502).

5. The method of utilizing waste heat from green ammonia production to heat electrolyte for hydrogen production by water electrolysis according to claim 4, characterized in that: A middle-layer extraction rack (504) is sleeved on the middle inner wall of the heat storage inner cone barrel (5); a top-layer extraction rack (505) having the same structure as the middle-layer extraction rack (504) is arranged on the top inner wall of the heat storage inner cone barrel (5); a plurality of extraction racks attached to the inner wall of the heat storage inner cone barrel (5) are arranged at the bottom of the middle-layer extraction rack (504); and built-in pipelines connected to the external connection port (501) are arranged on the frame bodies of the middle-layer extraction rack (504) and the top-layer extraction rack (505).

6. The method of utilizing waste heat from green ammonia production to heat electrolyte for hydrogen production by water electrolysis according to claim 2, characterized in that: A support sleeve (601) is provided at the bottom of the inner injection frame (6), an outer return pipe (602) is provided in the middle of the support sleeve (601) and is limitedly clamped in the center of the inner heat storage cone barrel (5), and an inner delivery pipe (603) is sleeved inside the outer return pipe (602).

7. The method of utilizing waste heat from green ammonia production to heat electrolyte for hydrogen production by water electrolysis according to claim 2, characterized in that: A conical chamber is provided between the heat storage outer conical barrel (4) and the heat storage inner conical barrel (5); the high-temperature regulating valve group (8) is provided with a support pipe inclined frame (801) clamped in the conical chamber; a plurality of groups of partition rings (803) sleeved in the conical chamber are provided on the inner wall of the support pipe inclined frame (801); and secondary hot injection ports (802) close to the partition rings (803) are provided on the surface of the frame bodies on both sides of the support pipe inclined frame (801).

8. The method of utilizing waste heat from green ammonia production to heat electrolyte for hydrogen production by water electrolysis according to claim 3, characterized in that: A movable slide (702) is arranged between the inner walls of the plurality of layer temperature material taking racks (7), a cylinder inclined frame (701) connected to the movable slide (702) is embedded on the inner wall of the layer temperature material taking rack (7), a telescopic electric valve (703) facing the heat storage outer cone barrel (4) is arranged on the inner wall of the movable slide (702), and a high temperature resistant telescopic pipe (704) connected to the telescopic electric valve (703) and the low temperature delivery valve (3) pipeline is arranged at the bottom of the movable slide (702).

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