Wind-solar hydrogen synthesis ammonia integrated device and process with waste heat closed loop recovery

Abstract

The application provides a wind-solar hydrogen synthesis ammonia integrated device and process with waste heat closed loop recovery, and belongs to the field of synthetic ammonia, comprising an electrolytic water hydrogen production module, a precise proportioning adjustment module, a synthetic ammonia reaction module, a product separation module and a waste heat closed loop recovery module; wherein the electrolytic water hydrogen production module, the synthetic ammonia reaction module and the product separation module are all connected with the waste heat closed loop recovery module pipeline, realizing cross-unit closed loop recovery and cascade utilization of the whole system heat, and the precise proportioning adjustment module is connected in series between the electrolytic water hydrogen production module and the synthetic ammonia reaction module, guaranteeing dynamic precise proportioning of nitrogen and hydrogen raw materials. The application aims to solve the problems of low system waste heat utilization rate, nitrogen and hydrogen proportioning adjustment lag, and low raw material utilization rate and ammonia synthesis efficiency in the existing wind-solar hydrogen synthesis ammonia technology, and realizes effective reduction of raw material consumption through integrated design of multi-module cooperation and waste heat closed loop recovery, while greatly improving ammonia synthesis efficiency and energy utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of ammonia synthesis technology, and more particularly to an integrated wind-solar hydrogen production and ammonia synthesis device with waste heat closed-loop recovery, and also to a process for wind-solar hydrogen production and ammonia synthesis with waste heat closed-loop recovery. Background Technology

[0002] As a core raw material in modern agriculture and basic chemical industries, the production scale and technological level of synthetic ammonia are directly related to global food security, industrial stability, and energy structure transformation. As a crucial link between agriculture, chemicals, and new energy industries, the application value of synthetic ammonia is extremely significant.

[0003] Traditional ammonia synthesis processes, which rely on fossil fuel-based hydrogen production, have significant drawbacks. First, they have high carbon emission intensity, making them a key target for emission reduction in the industrial sector. Second, they consume enormous amounts of energy and are highly dependent on resources, particularly non-renewable resources such as natural gas and coal, making them vulnerable to fluctuations in international energy prices and resource reserve limitations.

[0004] With the escalating global energy crisis and the advancement of the "dual carbon" goal, the replacement and upgrading of traditional ammonia synthesis processes has become an inevitable trend in the industry's development.

[0005] Against this backdrop, green ammonia synthesis technology, with water electrolysis for hydrogen production at its core, has emerged. This technology uses renewable energy as its power source, generates green hydrogen through water electrolysis, mixes it with nitrogen obtained from air separation, and then produces ammonia through a catalytic reaction, achieving zero carbon emissions and becoming a key focus of industry development.

[0006] However, the existing water electrolysis ammonia synthesis technology still has the following problems: First, there is serious heat waste, with waste heat from water electrolysis being directly discharged and only a portion of the waste heat from ammonia synthesis being recovered. The lack of cross-unit heat coupling results in low system thermal efficiency. Second, the nitrogen-hydrogen ratio adjustment is lagging and cannot respond to changes in operating conditions in real time, deviating from the optimal ratio of 1:3, resulting in low synthesis efficiency and raw material utilization, increasing waste and cost. Summary of the Invention

[0007] This invention provides an integrated wind-solar hydrogen production and ammonia synthesis device and process with waste heat closed-loop recovery, which solves the defects of low synthesis efficiency and low raw material utilization rate in the existing ammonia synthesis technology, thereby reducing raw material waste and improving ammonia synthesis efficiency.

[0008] The first aspect of the present invention provides an integrated wind and solar hydrogen production and ammonia synthesis device with waste heat closed-loop recovery, including a water electrolysis hydrogen production module, a precise proportioning adjustment module, an ammonia synthesis reaction module, a product separation module, and a waste heat closed-loop recovery module. The water electrolysis hydrogen production module is connected to the precise proportioning adjustment module via pipelines. The precise proportioning adjustment module is connected to the ammonia synthesis reaction module via pipelines. The ammonia synthesis reaction module is connected to the product separation module via pipelines. The water electrolysis hydrogen production module, the ammonia synthesis reaction module, and the product separation module are all connected to the waste heat closed-loop recovery module via pipelines. The precise proportioning and adjustment module includes a nitrogen-hydrogen mixer and a nitrogen preparation device; The water electrolysis hydrogen production module is connected to the nitrogen-hydrogen mixer via a hydrogen pipe. The nitrogen preparation device is connected to the inlet of the nitrogen-hydrogen mixer via a nitrogen pipe. The outlet of the nitrogen-hydrogen mixer is connected to the ammonia synthesis reaction module via a mixing pipe. A hydrogen purity sensor, a hydrogen mass flow meter, and a first flow regulating valve are installed on the hydrogen pipe. A nitrogen purity sensor, a nitrogen mass flow meter, and a second flow regulating valve are installed on the nitrogen pipe. The waste heat closed-loop recovery module includes a heat storage unit, which is connected to the water electrolysis hydrogen production module through a first heat exchanger, and is also connected to a second heat exchanger through the first heat exchanger.

[0009] Furthermore, the integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery according to the first aspect of the present invention may also have the following additional technical features: In some embodiments of the present invention, the water electrolysis hydrogen production module includes an electrolyzer, a cooling jacket, an oxygen cylinder, a first dryer, and a second dryer. The electrolytic cell is equipped with a water inlet, an oxygen outlet, and a hydrogen outlet. The water inlet is used to input electrolyzed water into the electrolytic cell. The inlet of the first dryer is connected to the oxygen outlet through a pipeline, and the oxygen cylinder is connected to the outlet of the first dryer through a pipeline. The inlet of the second dryer is connected to the hydrogen outlet through a pipeline, and the outlet of the second dryer is connected to the hydrogen pipeline. The cooling jacket is fitted onto the electrolytic cell and connected to the waste heat closed-loop recovery module via pipelines.

[0010] In some embodiments of the present invention, the nitrogen preparation apparatus includes an air compressor, an air separator, a nitrogen buffer tank, and a third dryer; The air compressor, air separator, nitrogen buffer tank and third dryer are connected in sequence through pipelines from beginning to end. The third dryer is connected to the nitrogen-hydrogen mixer through a nitrogen pipeline.

[0011] In some embodiments of the present invention, the ammonia synthesis reaction module includes a raw material preheater, a synthesis tower, and an annular heat exchange jacket; The inlet of the raw material preheater is connected to the nitrogen-hydrogen mixer via a mixing pipe, the outlet of the raw material preheater is connected to the inlet of the synthesis tower via a pipeline, and the outlet of the synthesis tower is connected to the product separation module via a pipeline. An annular heat exchange jacket covers the synthesis tower and is connected to the heat storage unit via a pipeline. An online ammonia synthesis conversion rate analyzer is also installed at the outlet of the synthesis tower.

[0012] In some embodiments of the present invention, the product separation module includes an ammonia separator, a reflux pipeline, a reflux pump, a fourth dryer, and an ammonia tank; The inlet of the ammonia separator is connected to the outlet of the synthesis tower via a pipeline. The reflux port of the ammonia separator is connected to the inlet of the synthesis tower via a reflux pipeline. A reflux pump is installed on the reflux pipeline. The inlet of the fourth dryer is connected to the outlet of the ammonia separator via a pipeline. The ammonia tank is connected to the outlet of the fourth dryer via a pipeline.

[0013] In some embodiments of the present invention, the precise proportioning adjustment module further includes a pressure sensor and a temperature sensor, both of which are mounted on the mixing tube.

[0014] In some embodiments of the present invention, the precise proportioning adjustment module further includes a first valve, and the product separation module further includes a second valve; The first valve is installed on the pipeline between the nitrogen buffer tank and the third dryer, and the second valve is installed on the return pipeline.

[0015] In some embodiments of the present invention, the interior of the heat storage device is filled with a phase change heat storage material, which includes, but is not limited to, molten nitrates, organic phase change materials, etc.

[0016] In some embodiments of the present invention, a new energy coupling power supply module is also included, which includes a photovoltaic power generation device, a wind power generation device, and an energy storage device. The photovoltaic power generation device and the wind power generation device are electrically connected to the energy storage device respectively; The water electrolysis hydrogen production module, the precise proportioning and adjustment module, the ammonia synthesis reaction module, the product separation module, and the waste heat closed-loop recovery module are all electrically connected to the energy storage device.

[0017] The second aspect of this invention provides a wind-solar hydrogen production and ammonia synthesis process with closed-loop waste heat recovery, utilizing all the technical features of the integrated wind-solar hydrogen production and ammonia synthesis device with closed-loop waste heat recovery of the first aspect of this invention, and further including the following steps: Step S100, power supply process: The energy storage device supplies power to the water electrolysis hydrogen production module, the precise ratio adjustment module, the ammonia synthesis reaction module, the product separation module and the waste heat closed-loop recovery module respectively. Step S200, the hydrogen and nitrogen preparation process, involves pumping electrolyzed water into the electrolytic cell through the water inlet, electrolyzing the water in the electrolytic cell to generate hydrogen and oxygen, and preparing nitrogen using a nitrogen preparation device; In step S300, the hydrogen and nitrogen mixing process involves exporting the low-temperature waste heat generated during electrolysis through a cooling jacket and temporarily storing it in a heat storage tank. The generated oxygen is dried by the first dryer and then transported to an oxygen cylinder. The generated hydrogen is dried by the second dryer and then transported to the nitrogen-hydrogen mixer through a hydrogen pipe. The prepared nitrogen is transported to the nitrogen-hydrogen mixer through a nitrogen pipe. In step S400, during the purity monitoring process, the generated hydrogen gas is dried by the second dryer and then transported to the nitrogen-hydrogen mixer via a hydrogen pipeline. During this process, the hydrogen purity sensor and the hydrogen mass flow meter monitor the hydrogen purity and mass in real time, and the first flow regulating valve adjusts its opening based on the real-time monitored hydrogen purity and mass. Similarly, during the process of the prepared nitrogen gas being transported to the nitrogen-hydrogen mixer via a nitrogen pipeline, the nitrogen purity sensor and the nitrogen mass flow meter monitor the nitrogen purity and mass in real time, and the second flow regulating valve adjusts its opening based on the real-time monitored nitrogen purity and mass. Step S500, the ammonia synthesis reaction process, uses a nitrogen-hydrogen mixer to mix nitrogen and hydrogen to form a nitrogen-hydrogen mixture and sends it to the raw material preheater for preheating. The nitrogen-hydrogen mixture after being preheated by the raw material preheater is sent to the synthesis tower to synthesize ammonia to form an ammonia mixture. Step S600, ammonia synthesis reaction process: The high-temperature waste heat generated by the ammonia synthesis reaction in the synthesis tower is exported through an annular heat exchange jacket and temporarily stored in a heat storage tank. Then, the ammonia mixture is sent to an ammonia separator for separation. The separated ammonia is collected as the final ammonia product. The unreacted nitrogen-hydrogen mixture is returned to the synthesis tower through a reflux pump to continue the ammonia synthesis reaction. Step S700, waste heat utilization process: part of the waste heat stored in the heat storage tank is preheated by the first heat exchanger to the alkaline solution of the electrolytic cell, and the other part is introduced into the raw material preheater to preheat the nitrogen-hydrogen mixture through the second heat exchanger. The waste heat utilization process is carried out simultaneously with the ammonia synthesis reaction process until the ammonia mixture is collected by the product separation module and the nitrogen-hydrogen mixture is refluxed, and the entire ammonia synthesis process is completed.

[0018] In summary, this application includes the following beneficial technical effects: By incorporating a water electrolysis hydrogen production module, high-pressure, high-purity hydrogen can be produced. Simultaneously, combined with the installation of a heat storage device, preliminary recovery of low-temperature waste heat can be achieved.

[0019] By incorporating a precise proportioning adjustment module, the accurate preparation, pretreatment, and dynamic proportioning adjustment of nitrogen and hydrogen raw materials can be achieved, thus solving the problems of inaccurate proportioning adjustment and lack of real-time sensing and dynamic correction capabilities in existing technologies. Specifically, by setting up hydrogen and nitrogen mass flow meters, the flow rates of nitrogen and hydrogen raw materials can be monitored in real time; by setting up hydrogen and nitrogen purity sensors, the purity fluctuations of nitrogen and hydrogen raw materials can be detected in real time. Combining the changes in the hydrogen and nitrogen mass flow meters, the current actual effective component proportion is calculated and compared with the target value. Once a deviation from the target proportion is detected, the first and second flow control valves are adjusted to dynamically adjust their openings, thereby dynamically regulating the flow rates of hydrogen and nitrogen, and achieving dynamic correction of the nitrogen-hydrogen ratio to achieve a 1:3 ratio, reducing raw material waste and improving ammonia synthesis efficiency.

[0020] The first heat exchanger in the waste heat closed-loop recovery module allows for the preheating of the alkaline solution used in water electrolysis for hydrogen production, reducing electrolysis energy consumption and achieving initial utilization of waste heat. The second heat exchanger exchanges heat with the high-temperature waste heat from the ammonia synthesis reaction, enabling secondary utilization of the waste heat. The heat storage device stores excess waste heat from the system, thus achieving closed-loop recovery, storage, and reuse of waste heat. This solves the problems of fragmented waste heat recovery and cross-unit heat coupling cycles in existing technologies, ensuring efficient heat utilization and supply-demand balance.

[0021] In summary, this ammonia synthesis unit achieves closed-loop coupling of waste heat across units, eliminating waste heat and significantly improving the system's thermal efficiency. At the same time, it enables real-time dynamic and precise control of the nitrogen-hydrogen ratio, simultaneously improving the utilization rate of nitrogen and hydrogen raw materials and the conversion rate of ammonia synthesis. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of an integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery according to some embodiments of the present invention is shown.

[0023] Figure label: 1. Electrolysis of water to produce hydrogen module, 101. Electrolyzer, 1011. Water inlet, 1012. Oxygen outlet, 1013. Hydrogen outlet, 102. Cooling jacket, 103. Oxygen cylinder, 104. First dryer, 105. Second dryer. 2. Precision proportioning and adjustment module, 201. Nitrogen-hydrogen mixer, 202. Hydrogen pipe, 203. Nitrogen preparation device, 2031. Air compressor, 2032. Air separator, 2033. Nitrogen buffer tank, 2034. Third dryer, 204. Nitrogen pipe, 205. Mixing pipe, 206. Hydrogen mass flow meter, 207. Nitrogen mass flow meter, 208. Hydrogen purity sensor, 209. Nitrogen purity sensor, 210. First flow regulating valve, 211. Second flow regulating valve, 212. Pressure sensor, 213. Temperature sensor, 214. First valve; 3. Ammonia synthesis reaction module, 301. Raw material preheater, 302. Synthesis tower, 303. Annular heat exchange jacket, 304. Online ammonia synthesis conversion rate analyzer; 4. Product separation module, 401. Ammonia separator, 402. Reflux pipeline, 403. Reflux pump, 404. Fourth dryer, 405. Ammonia tank, 406. Second valve; 5. Waste heat closed-loop recovery module, 501, first heat exchanger, 502, second heat exchanger, 503, heat storage tank; 6. New energy coupled power supply module; 601. Photovoltaic power generation device; 602. Wind power generation device; 603. Energy storage device. Detailed Implementation

[0024] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0025] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” used herein may also refer to the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a specific order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0026] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0027] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may also be rotated 90 degrees or in other orientations, and the spatial relative descriptors used in the text will be interpreted accordingly.

[0028] like Figure 1 As shown, according to an embodiment of the first aspect of the present invention, an integrated wind and solar hydrogen production and ammonia synthesis device with waste heat closed-loop recovery is proposed, including a water electrolysis hydrogen production module 1, a precise ratio adjustment module 2, an ammonia synthesis reaction module 3, a product separation module 4, and a waste heat closed-loop recovery module 5. The water electrolysis hydrogen production module 1 is connected to the precise ratio adjustment module 2 via a pipeline. The precise ratio adjustment module 2 is connected to the ammonia synthesis reaction module 3 via a pipeline. The ammonia synthesis reaction module 3 is connected to the product separation module 4 via a pipeline. The water electrolysis hydrogen production module 1, the ammonia synthesis reaction module 3, and the product separation module 4 are all connected to the waste heat closed-loop recovery module 5 via pipelines. The precise proportioning adjustment module 2 includes a nitrogen-hydrogen mixer 201, a hydrogen pipe 202, a nitrogen preparation device 203, a nitrogen pipe 204, a mixing pipe 205, a hydrogen mass flow meter 206, a nitrogen mass flow meter 207, a hydrogen purity sensor 208, and a nitrogen purity sensor 209. The water electrolysis hydrogen production module 1 is connected to the nitrogen-hydrogen mixer 201 via a hydrogen pipe 202. The nitrogen preparation device 203 is connected to the inlet of the nitrogen-hydrogen mixer 201 via a nitrogen pipe 204. The outlet of the nitrogen-hydrogen mixer 201 is connected to the ammonia synthesis reaction module 3 via a mixing pipe 205. A hydrogen purity sensor 208 and a hydrogen mass flow meter 206 are installed on the hydrogen pipe 202. A first flow regulating valve 210 is also installed on the hydrogen pipe 202. A nitrogen purity sensor 209 and a nitrogen mass flow meter 207 are installed on the nitrogen pipe 204. A second flow regulating valve 211 is also installed on the nitrogen pipe 204. The waste heat closed-loop recovery module 5 includes a first heat exchanger 501, a second heat exchanger 502 and a heat storage unit 503; the water electrolysis hydrogen production module 1 is connected to the heat storage unit 503 through the first heat exchanger 501, and the ammonia synthesis reaction module 3 is connected to the heat storage unit 503 through the second heat exchanger 502. The ammonia synthesis reaction module 3 is used to realize the ammonia synthesis reaction of nitrogen and hydrogen feedstocks; Product separation module 4 is used to separate the finished ammonia gas from the unreacted hydrogen and nitrogen raw materials in the ammonia gas mixture.

[0029] In the above embodiments, it should be noted that the first heat exchanger 501 is used to preheat the alkaline solution used for hydrogen production by water electrolysis; the second heat exchanger 502 is used to preheat the nitrogen-hydrogen mixture; the nitrogen-hydrogen mixer 201 is an existing device that mixes nitrogen and hydrogen in a set ratio and outputs a mixed gas with uniform composition, stable pressure and flow rate. The specific structure will not be discussed in detail here.

[0030] The nitrogen preparation device 203 can be a pressure swing adsorption nitrogen generator, a cryogenic air separation nitrogen generator, or a membrane separation nitrogen generator, etc.; the first flow regulating valve 210 and the second flow regulating valve 211 are both electric regulating ball valves.

[0031] The working principle of this device is as follows: First, hydrogen and oxygen are generated by electrolysis of water in the hydrogen production module 1. The low-temperature waste heat generated during the electrolysis process is exported and temporarily stored in the heat storage tank 503. The generated hydrogen is transported to the nitrogen-hydrogen mixer 201 through the hydrogen pipe 202 of the precise ratio adjustment module 2. The generated oxygen is collected and sold as a by-product.

[0032] While the water electrolysis hydrogen production module 1 produces hydrogen, the nitrogen preparation device 203 produces nitrogen and transports the nitrogen through the nitrogen pipe 204 to the nitrogen-hydrogen mixer 201.

[0033] During the hydrogen transport process, the hydrogen purity sensor 208 and the hydrogen mass flow meter 206 monitor the hydrogen purity and hydrogen mass in real time. The first flow regulating valve 210 adjusts its opening based on the real-time monitored hydrogen purity and hydrogen mass, thereby achieving dynamic adjustment of the nitrogen-hydrogen flow ratio. During the nitrogen transport process, the nitrogen purity sensor 209 and the nitrogen mass flow meter 207 monitor the nitrogen purity and nitrogen mass in real time. The second flow regulating valve 211 adjusts its opening based on the real-time monitored nitrogen purity and nitrogen mass.

[0034] Then, the nitrogen-hydrogen mixer 201 mixes nitrogen and hydrogen to form a nitrogen-hydrogen mixture and then sends it to the ammonia synthesis reaction module 3. The ammonia synthesis reaction module 3 performs an ammonia synthesis reaction on the nitrogen-hydrogen mixture. The high-temperature waste heat generated by the ammonia synthesis reaction module 3 is exported and temporarily stored in the heat storage tank 503. The waste heat stored in the heat storage tank 503 is used to preheat the alkaline solution of the water electrolysis hydrogen production module 1 via the first heat exchanger 501, and the other part is introduced into the ammonia synthesis reaction module 3 via the second heat exchanger 502 to preheat the nitrogen-hydrogen mixture, thus realizing closed-loop recovery of waste heat.

[0035] The ammonia mixture obtained from the ammonia synthesis reaction module 3 is sent to the product separation module 4 for separation. The ammonia gas separated by the ammonia separator 401 is collected as the final ammonia product. The unreacted nitrogen-hydrogen mixture is returned to the ammonia synthesis reaction module 3 and carried out together with the nitrogen-hydrogen mixture newly input to the ammonia synthesis reaction module 3 to improve the utilization rate of raw materials.

[0036] The technical effects achieved by the above embodiments are as follows: by setting up the water electrolysis hydrogen production module, high-pressure, high-purity hydrogen can be produced. Simultaneously, combined with the installation of a heat storage device, preliminary recovery of low-temperature waste heat can be achieved.

[0037] By incorporating the precise proportioning adjustment module 2, the precise preparation, pretreatment, and dynamic proportioning adjustment of nitrogen and hydrogen raw materials can be achieved, thus solving the problems of inaccurate proportioning adjustment and lack of real-time sensing and dynamic correction capabilities in existing technologies. Specifically, the hydrogen mass flow meter 206 and nitrogen mass flow meter 207 can monitor the flow rates of nitrogen and hydrogen raw materials in real time; the hydrogen purity sensor 208 and nitrogen purity sensor 209 can detect fluctuations in the purity of nitrogen and hydrogen raw materials in real time. By combining the changes in the hydrogen mass flow meter 206 and nitrogen mass flow meter 207, the current actual effective component proportion is calculated and compared with the target value. Once a deviation from the target proportion is detected, the first flow regulating valve 210 and the second flow regulating valve 211 are adjusted to dynamically adjust their openings, thereby dynamically regulating the flow rates of hydrogen and nitrogen, and achieving dynamic correction of the nitrogen-hydrogen ratio to achieve a 1:3 ratio, reducing raw material waste and improving ammonia synthesis efficiency.

[0038] The first heat exchanger 501 of the waste heat closed-loop recovery module 5 can preheat the alkaline solution used in water electrolysis for hydrogen production, reducing electrolysis energy consumption and achieving initial utilization of waste heat. The second heat exchanger 502 is used to exchange heat between the high-temperature waste heat from the ammonia synthesis reaction and the hydrogen-nitrogen mixture, achieving secondary utilization of waste heat. The heat storage device 503 can store the system's surplus waste heat, thereby achieving closed-loop recovery, storage, and reuse of waste heat. This solves the problems of fragmented waste heat recovery and cross-unit heat coupling cycles in existing technologies, ensuring efficient heat utilization and supply-demand balance.

[0039] Furthermore, the various modules of this invention—the water electrolysis hydrogen production module 1, the precise ratio adjustment module 2, the ammonia synthesis reaction module 3, the product separation module 4, and the waste heat closed-loop recovery module 5—are interconnected via pipelines to form an integrated process system. The water electrolysis hydrogen production module 1, the ammonia synthesis reaction module 3, and the product separation module 4 are all connected to the waste heat closed-loop recovery module 5 via pipelines, achieving cross-unit closed-loop recovery and cascade utilization of heat across the entire system. The precise ratio adjustment module 2 is connected in series between the water electrolysis hydrogen production module 1 and the ammonia synthesis reaction module 3, ensuring the dynamic and precise ratio of nitrogen and hydrogen feedstocks. This solves the technical problems of low system waste heat utilization, lagging nitrogen-hydrogen ratio adjustment, and low feedstock utilization and ammonia synthesis efficiency in existing wind-solar hydrogen production and ammonia synthesis technologies. Through the integrated design of multi-module collaboration and waste heat closed-loop recovery, it effectively reduces feedstock consumption while significantly improving ammonia synthesis efficiency and energy utilization efficiency.

[0040] Optional, such as Figure 1 As shown, the water electrolysis hydrogen production module 1 includes an electrolyzer 101, a cooling jacket 102, an oxygen cylinder 103, a first dryer 104, and a second dryer 105. The electrolyzer 101 is used to decompose electrolyzed water into hydrogen and oxygen. The electrolyzer 101 is provided with a water inlet 1011, an oxygen outlet 1012, and a hydrogen outlet 1013. The water inlet 1011 is used to input electrolyzed water into the electrolyzer 101. The inlet of the first dryer 104 is connected to the oxygen outlet 1012 through a pipeline. The oxygen cylinder 103 is connected to the outlet of the first dryer 104 through a pipeline. The inlet of the second dryer 105 is connected to the hydrogen outlet 1013 through a pipeline. The outlet of the second dryer 105 is connected to the hydrogen pipe 202. The cooling jacket 102 is fitted on the electrolyzer 101. The cooling jacket 102 is connected to the waste heat closed-loop recovery module 5 through a pipeline.

[0041] In the above optional embodiments, it should be noted that the inlet of the first dryer 104 refers to the inlet of the hot medium of the first dryer 104, and the outlet of the first dryer 104 refers to the outlet of the hot medium of the first dryer 104; the inlet of the second dryer 105 refers to the inlet of the hot medium of the second dryer 105, and the outlet of the second dryer 105 refers to the outlet of the hot medium of the second dryer 105; the electrolytic cell 101 is an existing electrolytic cell 101, which is filled with alkaline solution, and the cooling jacket 102 adopts the existing cooling jacket 102 structure, the specific structure of which will not be explained in detail.

[0042] The advantages of the above optional embodiments are that by setting the cooling jacket 102, the low-temperature waste heat in the electrolysis process can be effectively recovered, and the waste heat can be reused. By setting the electrolytic cell 101, high-pressure, high-purity hydrogen can be produced, and zero carbon emissions can be achieved.

[0043] Optional, such as Figure 1 As shown, the nitrogen preparation device 203 includes an air compressor 2031, an air separator 2032, a nitrogen buffer tank 2033, and a third dryer 2034. The air compressor 2031, air separator 2032, nitrogen buffer tank 2033, and third dryer 2034 are connected sequentially from beginning to end by pipelines. The third dryer 2034 is connected to the nitrogen-hydrogen mixer 201 by a nitrogen pipe 204.

[0044] The inlet of the third dryer 2034 is connected to the nitrogen buffer tank 2033 via a pipeline, and the outlet of the third dryer 2034 is connected to the nitrogen pipe 204.

[0045] The air separator 2032 is a variable pressure air separator 2032.

[0046] The working principle of nitrogen preparation device 203 is as follows: First, the air is compressed into high-pressure air using the air compressor 2031 and then sent to the air separator 2032. The air separator 2032 then separates the nitrogen from the high-pressure air and sends it through the nitrogen buffer tank 2033 to the third dryer 2034. Finally, the third dryer 2034 condenses the nitrogen and then sends it through the nitrogen pipe 204 to the nitrogen-hydrogen mixer 201.

[0047] The advantages of the above-mentioned optional embodiments are as follows: by providing the air compressor 2031, air can be compressed to a specified pressure and then sent to the air separator 2032. By providing the air separator 2032, air can be separated to obtain high-purity nitrogen. By providing the nitrogen buffer tank 2033 and the third dryer 2034, the output pressure of nitrogen can be stabilized, thereby ensuring that nitrogen is delivered to the nitrogen-hydrogen mixer 201 relatively stably and quickly.

[0048] Optional, such as Figure 1 As shown, the ammonia synthesis reaction module 3 includes a raw material preheater 301, a synthesis tower 302, and an annular heat exchange jacket 303; The inlet of the raw material preheater 301 is connected to the nitrogen-hydrogen mixer 201 through the mixing pipe 205. The outlet of the raw material preheater 301 is connected to the inlet of the synthesis tower 302 through a pipeline. The outlet of the synthesis tower 302 is connected to the product separation module 4 through a pipeline. The annular heat exchange jacket 303 covers the synthesis tower 302 and is connected to the heat storage tank 503 through a pipeline. The outlet of the synthesis tower 302 is also equipped with an online ammonia synthesis conversion rate analyzer 304.

[0049] In the above optional embodiments, it should be noted that the raw material preheater 301 is an existing synthetic ammonia raw material gas preheater, and its specific structure will not be explained in detail here.

[0050] The raw material preheater 301 is used to preheat the nitrogen-hydrogen mixture to the catalyst activity temperature so that the synthesis tower 302 can carry out the synthesis reaction of the nitrogen-hydrogen mixture to form ammonia.

[0051] The synthesis tower 302 is an existing ammonia synthesis tower 302, specifically an axially adiabatic synthesis tower 302, used to catalyze the nitrogen-hydrogen synthesis reaction and synthesize ammonia from a nitrogen-hydrogen mixture. The outer shell of the synthesis tower 302 is made of a high-temperature and high-pressure resistant alloy material, and the inside is filled with catalyst.

[0052] The inlet of the raw material preheater 301 refers to the raw material gas inlet of the raw material preheater 301, which also refers to the cold medium inlet; the outlet of the raw material preheater 301 refers to the preheated raw material gas outlet, which also refers to the cold medium outlet.

[0053] The inlet of synthesis tower 302 refers to the raw material gas inlet of synthesis tower 302; the outlet of synthesis tower 302 refers to the reaction gas outlet of synthesis tower 302.

[0054] The advantages of the above optional embodiments are as follows: the annular heat exchange jacket 303 can efficiently remove the high-temperature waste heat generated by the reaction for subsequent waste heat recovery. The raw material preheater 301 is connected to the heat storage tank 503 of the waste heat closed-loop recovery module 5, which can utilize the recovered waste heat to preheat the nitrogen-hydrogen mixture, improving reaction efficiency and reducing energy consumption. The online ammonia synthesis conversion rate analyzer 304 can monitor the ammonia synthesis conversion rate in real time.

[0055] Optional, such as Figure 1As shown, the product separation module 4 includes an ammonia separator 401, a reflux pipeline 402, a reflux pump 403, a fourth dryer 404, and an ammonia tank 405. The inlet of the ammonia separator 401 is connected to the outlet of the synthesis tower 302 through a pipeline, the reflux port of the ammonia separator 401 is connected to the inlet of the synthesis tower 302 through the reflux pipeline 402, the reflux pump 403 is installed on the reflux pipeline 402, the inlet of the fourth dryer 404 is connected to the outlet of the ammonia separator 401 through a pipeline, and the ammonia tank 405 is connected to the outlet of the fourth dryer 404 through a pipeline.

[0056] In the above optional embodiments, it should be noted that the ammonia separator 401 is used to separate the ammonia product output from the synthesis tower 302 from the unreacted nitrogen-hydrogen mixture. The unreacted nitrogen-hydrogen mixture is recycled back to the synthesis tower 302 via the reflux pump 403. The ammonia gas formed after separation is condensed by the fourth dryer 404 and stored in the ammonia tank 405.

[0057] Here, the inlet of the fourth dryer 404 refers to the inlet of the hot medium of the fourth dryer 404, and the outlet of the fourth dryer 404 refers to the outlet of the hot medium of the fourth dryer 404; the inlet of the ammonia separator 401 refers to the inlet of the high-temperature mixed gas of the ammonia separator 401; the reflux port of the ammonia separator 401 refers to the outlet of the circulating gas of the ammonia separator 401; and the outlet of the ammonia separator 401 refers to the outlet of the ammonia gas of the ammonia separator 401.

[0058] The advantages of the above optional embodiments are as follows: by setting the reflux pump 403, the unreacted nitrogen-hydrogen mixer 201 can be returned to the synthesis tower 302 for recycling, which improves the utilization rate of raw materials and increases the purity of synthesized ammonia.

[0059] Optional, such as Figure 1 As shown, the precise proportioning adjustment module 2 also includes a pressure sensor 212 and a temperature sensor 213, both of which are mounted on the mixing tube 205.

[0060] In the above optional embodiments, it should be noted that both pressure sensor 212 and temperature sensor 213 are located at the outlet of nitrogen-hydrogen mixer 201.

[0061] The advantages of the above optional embodiments are that the pressure sensor 212 and temperature sensor 213 can monitor the pressure and temperature of the nitrogen-hydrogen mixture in real time to ensure the stability of the nitrogen-hydrogen mixture delivery.

[0062] Optional, such as Figure 1As shown, the precise proportioning adjustment module 2 also includes a first valve 214, and the product separation module 4 also includes a second valve 406. The first valve 214 is installed on the pipeline between the nitrogen buffer tank 2033 and the third dryer 2034, and the second valve 406 is installed on the return pipeline 402.

[0063] In the above optional embodiments, it should be noted that both the first valve 214 and the second valve 406 are solenoid valves.

[0064] Optional, such as Figure 1 As shown, the interior of the heat storage device 503 is filled with phase change heat storage material.

[0065] In the above optional embodiments, it should be noted that the heat storage device 503 is a phase change heat storage device 503; the phase change material includes, but is not limited to, molten nitrate, organic phase change material, etc.

[0066] Optional, such as Figure 1 As shown, it also includes a new energy coupled power supply module 6, which includes a photovoltaic power generation device 601, a wind power generation device 602, and an energy storage device 603. The photovoltaic power generation device 601 and the wind power generation device 602 are electrically connected to the energy storage device 603. The water electrolysis hydrogen production module 1, the precise ratio adjustment module 2, the ammonia synthesis reaction module 3, the product separation module 4, and the waste heat closed-loop recovery module 5 are all electrically connected to the energy storage device 603.

[0067] In the above optional embodiments, it should be noted that the energy storage device 603 can be any existing device that can realize the energy storage function, and the specific structural composition and working principle will not be explained in detail here.

[0068] The beneficial effects of the above optional embodiments are as follows: the coordinated setting of photovoltaic power generation device 601 and wind power generation device 602 realizes the coupling power supply of new energy, thereby realizing the adaptation of new energy volatility and ensuring the stable power supply of this device, providing low-carbon and stable power support for the entire device.

[0069] In summary, this device achieves full-process synergistic optimization of low-carbon power supply, waste heat closed-loop, and precise nitrogen-hydrogen ratio.

[0070] A wind-solar hydrogen production and ammonia synthesis process with waste heat closed-loop recovery, using all the technical features of the integrated wind-solar hydrogen production and ammonia synthesis device with waste heat closed-loop recovery according to the first aspect of the present invention, and further including the following steps: In step S100, the power supply process uses the energy storage device 603 to supply power to the water electrolysis hydrogen production module 1, the precise ratio adjustment module 2, the ammonia synthesis reaction module 3, the product separation module 4, and the waste heat closed-loop recovery module 5. In step S200, the hydrogen and nitrogen preparation process, electrolyzed water is pumped into the electrolytic cell 101 through the water inlet 1011, and the electrolyzed water is electrolyzed in the electrolytic cell 101 to generate hydrogen and oxygen; nitrogen is prepared using the nitrogen preparation device 203. In step S300, the hydrogen and nitrogen mixing process involves exporting the low-temperature waste heat generated during electrolysis through cooling jacket 102 and temporarily storing it in heat storage tank 503. The generated oxygen is dried by first dryer 104 and then transported to oxygen cylinder 103. The generated hydrogen is dried by second dryer 105 and then transported to nitrogen-hydrogen mixer 201 through hydrogen pipe 202. The prepared nitrogen is transported to nitrogen-hydrogen mixer 201 through nitrogen pipe 204. In step S400, during the purity monitoring process, the generated hydrogen gas is dried by the second dryer 105 and then transported to the nitrogen-hydrogen mixer 201 via the hydrogen pipe 202. During this process, the hydrogen purity sensor 208 and the hydrogen mass flow meter 206 monitor the hydrogen purity and hydrogen mass in real time. The first flow regulating valve 210 adjusts its opening degree according to the real-time monitored hydrogen purity and hydrogen mass. During the process of the prepared nitrogen gas being transported to the nitrogen-hydrogen mixer 201 via the nitrogen pipe 204, the nitrogen purity sensor 209 and the nitrogen mass flow meter 207 monitor the nitrogen purity and nitrogen mass in real time. The second flow regulating valve 211 adjusts its opening degree according to the real-time monitored nitrogen purity and nitrogen mass. Step S500, the ammonia synthesis reaction process, uses nitrogen-hydrogen mixer 201 to mix nitrogen and hydrogen to form nitrogen-hydrogen mixed gas and sends it to raw material preheater 301 for preheating. The nitrogen-hydrogen mixed gas after being preheated by raw material preheater 301 is sent to synthesis tower 302 to synthesize ammonia to form ammonia mixed gas. In step S600, during the ammonia synthesis reaction, the high-temperature waste heat generated by the ammonia synthesis reaction in the synthesis tower 302 is discharged through the annular heat exchange jacket 303 and temporarily stored in the heat storage tank 503. Then, the ammonia mixture is sent to the ammonia separator 401 for separation. The separated ammonia is collected as the final ammonia product, and the unreacted nitrogen-hydrogen mixture is returned to the synthesis tower 302 through the reflux pump 403 to continue the ammonia synthesis reaction. In step S700, the waste heat utilization process involves the waste heat stored in the heat storage tank 503 being used to preheat the alkaline solution in the electrolytic cell 101 via the first heat exchanger 501, and the other part being introduced into the raw material preheater 301 via the second heat exchanger 502 to preheat the nitrogen-hydrogen mixture. The waste heat utilization process is carried out simultaneously with the ammonia synthesis reaction process until the ammonia mixture is collected and the nitrogen-hydrogen mixture is refluxed through the product separation module, thus completing the entire ammonia synthesis process.

[0071] In the above embodiments, it should be noted that in step S400, the first flow regulating valve 210 and the second flow regulating valve 211 can adjust the proportioning parameters in real time according to the data from the online ammonia synthesis conversion analyzer 304 to adjust the opening degree in real time.

[0072] The technical effects achieved by the above embodiments are as follows: closed-loop coupling of waste heat across units is realized, eliminating the phenomenon of waste heat waste, greatly improving the thermal efficiency of the system, while realizing real-time dynamic and precise control of the nitrogen-hydrogen ratio, and simultaneously improving the raw material utilization rate of nitrogen and hydrogen and the ammonia synthesis conversion rate.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery, characterized in that, It includes a water electrolysis hydrogen production module (1), a precise ratio adjustment module (2), an ammonia synthesis reaction module (3), a product separation module (4), and a waste heat closed-loop recovery module (5); The water electrolysis hydrogen production module (1) is connected to the precise proportioning adjustment module (2) via a pipeline. The precise proportioning adjustment module (2) is connected to the ammonia synthesis reaction module (3) via a pipeline. The ammonia synthesis reaction module (3) is connected to the product separation module (4) via a pipeline. The water electrolysis hydrogen production module (1), the ammonia synthesis reaction module (3), and the product separation module (4) are all connected to the waste heat closed-loop recovery module (5) via pipelines. The precise proportioning adjustment module (2) includes a nitrogen-hydrogen mixer (201) and a nitrogen preparation device (203). The water electrolysis hydrogen production module (1) is connected to the nitrogen-hydrogen mixer (201) via a hydrogen pipe (202). The nitrogen preparation device (203) is connected to the inlet of the nitrogen-hydrogen mixer (201) via a nitrogen pipe (204). The outlet of the nitrogen-hydrogen mixer (201) is connected to the ammonia synthesis reaction module (3) via a mixing pipe (205). The hydrogen pipe (202) is equipped with a hydrogen purity sensor (208), a hydrogen mass flow meter (206), and a first flow regulating valve (210). The nitrogen pipe (204) is equipped with a nitrogen purity sensor (209), a nitrogen mass flow meter (207), and a second flow regulating valve (211). The waste heat closed-loop recovery module (5) includes a heat storage unit (503), which is connected to the water electrolysis hydrogen production module (1) through a first heat exchanger (501) and to the ammonia synthesis reaction module (3) through a second heat exchanger (502).

2. The integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery as described in claim 1, characterized in that, The water electrolysis hydrogen production module (1) includes an electrolyzer (101), a cooling jacket (102), an oxygen cylinder (103), a first dryer (104), and a second dryer (105); The electrolytic cell (101) is provided with a water inlet (1011), an oxygen outlet (1012) and a hydrogen outlet (1013). The water inlet (1011) is used to input electrolyzed water into the electrolytic cell (101). The inlet of the first dryer (104) is connected to the oxygen outlet (1012) through a pipeline. The oxygen cylinder (103) is connected to the outlet of the first dryer (104) through a pipeline. The inlet of the second dryer (105) is connected to the hydrogen outlet (1013) through a pipeline. The outlet of the second dryer (105) is connected to the hydrogen pipe (202). The cooling jacket (102) is fitted onto the electrolytic cell (101) and is connected to the waste heat closed-loop recovery module (5) via a pipeline.

3. The integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery as described in claim 1, characterized in that, The nitrogen preparation device (203) includes an air compressor (2031), an air separator (2032), a nitrogen buffer tank (2033), and a third dryer (2034). The air compressor (2031), the air separator (2032), the nitrogen buffer tank (2033), and the third dryer (2034) are connected sequentially from beginning to end by pipelines. The third dryer (2034) is connected to the nitrogen-hydrogen mixer (201) by the nitrogen pipe (204).

4. The integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery according to claim 3, characterized in that, The ammonia synthesis reaction module (3) includes a raw material preheater (301), a synthesis tower (302), and an annular heat exchange jacket (303). The inlet of the raw material preheater (301) is connected to the nitrogen-hydrogen mixer (201) through the mixing pipe (205), the outlet of the raw material preheater (301) is connected to the inlet of the synthesis tower (302) through a pipeline, and the outlet of the synthesis tower (302) is connected to the product separation module (4) through a pipeline. The annular heat exchange jacket (303) covers the synthesis tower (302) and is connected to the heat storage device (503) through a pipeline. The outlet of the synthesis tower (302) is also equipped with an online ammonia synthesis conversion rate analyzer (304).

5. The integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery according to claim 4, characterized in that, The product separation module (4) includes an ammonia separator (401), a reflux pipeline (402), a reflux pump (403), a fourth dryer (404), and an ammonia tank (405). The inlet of the ammonia separator (401) is connected to the outlet of the synthesis tower (302) via a pipeline. The reflux port of the ammonia separator (401) is connected to the inlet of the synthesis tower (302) via a reflux pipeline (402). The reflux pump (403) is installed on the reflux pipeline (402). The inlet of the fourth dryer (404) is connected to the outlet of the ammonia separator (401) via a pipeline. The ammonia tank (405) is connected to the outlet of the fourth dryer (404) via a pipeline.

6. The integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery according to claim 1, characterized in that, The precise proportioning adjustment module (2) also includes a pressure sensor (212) and a temperature sensor (213), both of which are mounted on the mixing tube (205).

7. The integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery according to claim 5, characterized in that, The precise proportioning adjustment module (2) also includes a first valve (214), and the product separation module (4) also includes a second valve (406). The first valve (214) is installed on the pipeline between the nitrogen buffer tank (2033) and the third dryer (2034), and the second valve (406) is installed on the return pipeline (402).

8. The integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery according to claim 1, characterized in that, The interior of the heat storage device (503) is filled with phase change heat storage material.

9. The integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery according to claim 1, characterized in that, It also includes a new energy coupled power supply module (6), which includes a photovoltaic power generation device (601), a wind power generation device (602) and an energy storage device (603). The photovoltaic power generation device (601) and the wind power generation device (602) are respectively electrically connected to the energy storage device (603); The water electrolysis hydrogen production module (1), the precise ratio adjustment module (2), the ammonia synthesis reaction module (3), the product separation module (4), and the waste heat closed-loop recovery module (5) are all electrically connected to the energy storage device (603).

10. A wind-solar hydrogen production and ammonia synthesis process with closed-loop waste heat recovery, characterized in that, In addition to using all the technical features of the integrated wind-solar hydrogen production and ammonia synthesis unit with waste heat closed-loop recovery as described in any one of claims 1 to 9, the unit also includes the following steps: In step S100, the power supply process uses an energy storage device (603) to supply power to the water electrolysis hydrogen production module (1), the precise ratio adjustment module (2), the ammonia synthesis reaction module (3), the product separation module (4), and the waste heat closed-loop recovery module (5). In step S200, the hydrogen and nitrogen preparation process, electrolyzed water is pumped into the electrolytic cell (101) through the water inlet (1011), and the electrolyzed water is electrolyzed to generate hydrogen and oxygen using the electrolytic cell (101); nitrogen is prepared using the nitrogen preparation device (203); In step S300, the hydrogen and nitrogen mixing process involves exporting the low-temperature waste heat generated during electrolysis through a cooling jacket (102) and temporarily storing it in a heat storage tank (503). The generated oxygen is dried by a first dryer (104) and then transported to an oxygen cylinder (103). The generated hydrogen is dried by a second dryer (105) and then transported to a nitrogen-hydrogen mixer (201) through a hydrogen pipe (202). The prepared nitrogen is transported to the nitrogen-hydrogen mixer (201) through a nitrogen pipe (204). In step S400, during the purity monitoring process, the generated hydrogen is dried by the second dryer (105) and then transported to the nitrogen-hydrogen mixer (201) through the hydrogen pipe (202). During this process, the hydrogen purity sensor (208) and the hydrogen mass flow meter (206) monitor the hydrogen purity and hydrogen mass in real time. The first flow regulating valve (210) adjusts its opening according to the real-time monitored hydrogen purity and hydrogen mass. During the process of the prepared nitrogen being transported to the nitrogen-hydrogen mixer (201) through the nitrogen pipe (204), the nitrogen purity sensor (209) and the nitrogen mass flow meter (207) monitor the nitrogen purity and nitrogen mass in real time. The second flow regulating valve (211) adjusts its opening according to the real-time monitored nitrogen purity and nitrogen mass. Step S500, the ammonia synthesis reaction process, uses a nitrogen-hydrogen mixer (201) to mix nitrogen and hydrogen to form a nitrogen-hydrogen mixture and sends it to the raw material preheater (301) for preheating. The nitrogen-hydrogen mixture after being preheated by the raw material preheater (301) is sent to the synthesis tower (302) to synthesize ammonia to form an ammonia mixture. In step S600, the ammonia synthesis reaction process, the high-temperature waste heat generated by the ammonia synthesis reaction in the synthesis tower (302) is discharged through the annular heat exchange jacket (303) and temporarily stored in the heat storage tank (503). Then, the ammonia mixture is sent to the ammonia separator (401) for separation. The separated ammonia is collected as the final ammonia product. The unreacted nitrogen-hydrogen mixture is returned to the synthesis tower (302) through the reflux pump (403) to continue the ammonia synthesis reaction. In step S700, the waste heat utilization process, part of the waste heat stored in the heat storage tank (503) is used to preheat the alkaline solution of the electrolytic cell (101) through the first heat exchanger (501), and the other part is introduced to the raw material preheater (301) through the second heat exchanger (502) to preheat the nitrogen-hydrogen mixture. The waste heat utilization process is carried out synchronously with the ammonia synthesis reaction process until the ammonia mixture is collected and the nitrogen-hydrogen mixture is refluxed through the product separation module (4), and the entire ammonia synthesis process is completed.

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