Synthetic ammonia coupling hydrogen production system and method

Abstract

The embodiment of the invention relates to the technical field of green chemical engineering, and provides a system and method for hydrogen production by coupling synthesis ammonia, and the system comprises a hydrogen production module, a hydrogen deoxidation module, an adsorption module and a synthesis ammonia module which are communicated in sequence; the nitrogen supply module, the regeneration module and the adsorption module are sequentially communicated; when one of the regeneration module and the adsorption module comprises a first adsorption tower, the other comprises a second adsorption tower; the hydrogen purification module, the nitrogen supply module and the ammonia synthesis module are all connected with the first adsorption tower and the second adsorption tower in a breakable / closable manner; the nitrogen supply module is used for supplying nitrogen, and the regeneration module is used for desorbing and regenerating the first adsorption tower or the second adsorption tower by using the nitrogen and supplying the nitrogen to the adsorption module; the hydrogen production module provides hydrogen to be purified, and the hydrogen deoxidation module purifies the hydrogen to be purified and then provides the purified hydrogen to the adsorption module; hydrogen and nitrogen are purified by the adsorption module and then are supplied to the ammonia synthesis module, so that the energy consumption and the system investment cost are at least reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of green chemical technology, and in particular to a system and method for coupling synthetic ammonia with hydrogen production. Background Art

[0002] As the world pays more attention to the environment, hydrogen energy, as a green energy, has attracted much attention due to its advantages such as high calorific value, zero emission and no pollution, and the relevant technologies of hydrogen have developed rapidly. Among them, the wind and solar integration projects based on "source, grid, load and storage" have come one after another, and the dynamic water electrolysis hydrogen production technology and dynamic ammonia synthesis technology have also developed rapidly. However, there are some technical barriers to how the dynamic hydrogen purification technology couples the dynamic hydrogen production and dynamic ammonia synthesis.

[0003] In addition, the mainstream purification equipment on the market currently adopts the PSA (Pressure Swing Adsorption) process for hydrogen bulk regeneration. Since hydrogen molecules are small and carry less water, the energy consumption of hydrogen regeneration is correspondingly higher under the same dehydration conditions. In addition, the later stage of synthetic ammonia process still needs to add nitrogen and hydrogen mixing equipment, which increases the equipment investment cost, and the system adopts a more complex sequential control system, which increases the investment in instrumentation and control. Summary of the invention

[0004] The embodiments of the present application provide a system and method for coupling synthetic ammonia with hydrogen production, which at least helps to reduce energy consumption and system investment costs.

[0005] According to some embodiments of the present application, on the one hand, the embodiments of the present application provide a system for synthesizing ammonia coupled with hydrogen production, comprising: a hydrogen production module, a hydrogen deoxygenation module, an adsorption module and a synthetic ammonia module connected in sequence; a nitrogen supply module and a regeneration module connected in sequence, the regeneration module being connected to the adsorption module; wherein, when the regeneration module comprises a first adsorption tower, the adsorption module comprises a second adsorption tower; when the regeneration module comprises the second adsorption tower, the adsorption module comprises the first adsorption tower; the hydrogen deoxygenation module, the nitrogen supply module and the synthetic ammonia module are all connected to the first adsorption tower and The second adsorption tower can be connected in an on / off manner; the nitrogen supply module is used to provide nitrogen to the regeneration module, and the regeneration module is used to desorb and regenerate the desiccant in the first adsorption tower or the second adsorption tower using nitrogen, and provide nitrogen to the adsorption module; the hydrogen production module is used to provide hydrogen to be purified, and the hydrogen deoxygenation module is used to purify the hydrogen to be purified to obtain hydrogen to be mixed, and provide the hydrogen to be mixed to the adsorption module; the adsorption module is used to purify the mixed hydrogen and nitrogen, and provide the purified hydrogen and nitrogen to the synthetic ammonia module.

[0006] According to some embodiments of the present application, on the other hand, an embodiment of the present application further provides a method for coupling ammonia synthesis and hydrogen production, including: providing and utilizing a hydrogen production module to provide hydrogen to be purified; providing a hydrogen deoxygenation module communicated with the hydrogen production module, and using the hydrogen deoxygenation module to purify the hydrogen to be purified to obtain the hydrogen to be mixed, and providing the hydrogen to be mixed to an adsorption module communicated with the hydrogen deoxygenation module; providing a nitrogen supply module and a regeneration module connected in sequence, and the regeneration module is communicated with the adsorption module, and using the nitrogen supply module to provide nitrogen to the regeneration module, using nitrogen to desorb and regenerate the desiccant in one of the first adsorption tower and the second adsorption tower included in the regeneration module, and providing nitrogen to the adsorption module including the other of the first adsorption tower and the second adsorption tower; using the adsorption module to dehydrate the mixed hydrogen and nitrogen, and providing the dehydrated hydrogen and nitrogen to an ammonia synthesis module communicated with the adsorption module.

[0007] The technical solution provided by the embodiment of the present application has at least the following advantages:

[0008] The equipment for dehydrating hydrogen and nitrogen and the equipment for mixing hydrogen and nitrogen are integrated. That is, the adsorption module is not only used for mixing hydrogen and nitrogen, but also for dehydrating the mixed hydrogen and nitrogen, which is beneficial to reducing the number of equipment required for the ammonia synthesis coupled hydrogen production system and simplifying its control logic, saving equipment and instrument control investment, and thus beneficial to reducing the investment cost of the system. Further, the hydrogen deoxygenation module, the nitrogen supply module and the ammonia synthesis module are all connected to the first adsorption tower and the second adsorption tower in a conductible / closable manner, so that the working states of the first adsorption tower and the second adsorption tower can be switched. In this way, not only can one of the first adsorption tower and the second adsorption tower be used to mix and dehydrate hydrogen and nitrogen, but also it is beneficial to use nitrogen to desorb and regenerate the desiccant in the other of the first adsorption tower and the second adsorption tower, enabling the regeneration module and the adsorption module to work simultaneously. It is worth emphasizing that, on the one hand, nitrogen serves both as the raw material required for ammonia synthesis and as the regeneration gas required for the first adsorption tower and the second adsorption tower, without the need to use an additional gas as the regeneration gas required for the first adsorption tower and the second adsorption tower; on the other hand, compared with using hydrogen as the regeneration gas required for the first adsorption tower and the second adsorption tower, nitrogen molecules are larger and carry more water. Under the same desorption heat, the consumption of nitrogen is smaller, so under the same dehydration conditions, the energy consumption for nitrogen regeneration is correspondingly lower and the regeneration efficiency is higher. Description of the Drawings

[0009] One or more embodiments are exemplarily illustrated by pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the figures in the accompanying drawings do not constitute a scale limitation. To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0010] Figure 1 It is a functional block diagram of a system for synthesizing ammonia coupled with hydrogen production provided by an embodiment of the present application;

[0011] Figure 2 It is a structural schematic diagram of a system for synthesizing ammonia coupled with hydrogen production provided by an embodiment of the present application;

[0012] Figure 3 It is another structural schematic diagram of a system for synthesizing ammonia coupled with hydrogen production provided by an embodiment of the present application. Detailed implementation manners

[0013] As can be seen from the background art, the dynamic coupling of hydrogen production technology and ammonia synthesis technology still needs further research.

[0014] The embodiments of the present application provide a semiconductor structure, which integrates the equipment for dehydrating hydrogen and nitrogen and the equipment for mixing hydrogen and nitrogen. That is, the adsorption module is not only used for mixing hydrogen and nitrogen, but also for dehydrating the mixed hydrogen and nitrogen, which is beneficial to reducing the number of equipment required for the system of synthesizing ammonia coupled with hydrogen production and simplifying its control logic, saving equipment and instrument control investment, and thus being beneficial to reducing the investment cost of the system. Further, the hydrogen deoxidation module, the nitrogen supply module, and the ammonia synthesis module are all connected to the first adsorption tower and the second adsorption tower in a conduction / closure manner, so that the working states of the first adsorption tower and the second adsorption tower can be switched. In this way, not only can one of the first adsorption tower or the second adsorption tower be used to mix and dehydrate hydrogen and nitrogen, but also it is beneficial to use nitrogen to desorb and regenerate the desiccant in the other one of the first adsorption tower or the second adsorption tower, enabling the regeneration module and the adsorption module to work simultaneously. It should be emphasized that, on the one hand, nitrogen is both a raw material required for ammonia synthesis and the regeneration gas required for the first adsorption tower and the second adsorption tower, and there is no need to use an additional gas as the regeneration gas required for the first adsorption tower and the second adsorption tower; on the other hand, compared with using hydrogen as the regeneration gas required for the first adsorption tower and the second adsorption tower, nitrogen molecules are larger and carry more water. Under the same desorption heat, the amount of nitrogen used is smaller, so under the same dehydration conditions, the energy consumption for nitrogen regeneration is correspondingly lower and the regeneration efficiency is higher.

[0015] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise clearly and specifically defined.

[0016] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0017] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: there is A, there is both A and B, and there is B. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0018] In the description of the embodiments of the present application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0019] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0020] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0021] In the accompanying drawings corresponding to the embodiments of the present application, for better understanding and convenience of description, the thickness and area of the layers are enlarged. When describing a component (such as a layer, film, region or substrate) on or on the surface of another component, the component may be "directly" on the surface of the other component, or there may be a third component between the two components. On the contrary, when describing a component on the surface of another component or when a surface of a component forms or is provided with another component, it means that there is no third component between the two components. In addition, when describing a component being "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor on a partial edge of the entire surface.

[0022] In the description of the embodiments of the present application, when a certain component "includes" another component, unless otherwise specified, other components are not excluded, and other components may further be included. In addition, when components such as layers, films, regions or plates are referred to as being "on / located on" another component, it may be "directly on" the other component (i.e., on the surface of the other component and there is no other component between them), or there may be another component therebetween. In addition, when components such as layers, films, regions, plates are "directly located on" another component, or when components such as layers, films, regions, plates are located on the surface of another component, it means that there is no other component located therebetween.

[0023] The terms used in the description of the various embodiments herein are only for describing specific embodiments and are not intended to be limiting. As used in the description of the various embodiments and the appended claims, "the component" is also intended to include the plural form, unless the context clearly indicates otherwise. Among them, the component includes components such as layers, films, regions or plates.

[0024] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present application, many technical details are provided to enable readers to better understand the embodiments of the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required to be protected by the embodiments of the present application can still be achieved.

[0025] An embodiment of the present application provides a system for synthesizing ammonia coupled with hydrogen production. The system for synthesizing ammonia coupled with hydrogen production provided by an embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0026] With reference to Figures 1 to 3, the system for synthesizing ammonia and coupling to produce hydrogen includes: a hydrogen production module 20, a hydrogen deoxygenation module 30, an adsorption module 40, and a synthetic ammonia module 50 that are connected in sequence; a nitrogen supply module 60 and a regeneration module 70 that are connected in sequence, and the regeneration module 70 is connected to the adsorption module 40; wherein, when the regeneration module 70 includes a first adsorption tower 9, the adsorption module 40 includes a second adsorption tower 10; when the regeneration module 70 includes a second adsorption tower 10, the adsorption module 40 includes a first adsorption tower 9; the hydrogen deoxygenation module 30, the nitrogen supply module 60, and the synthetic ammonia module 50 are all connected to the first adsorption tower 9 and the second adsorption tower 10 in a conductible / closable manner; the nitrogen supply module 60 is used to supply nitrogen to the regeneration module 70, and the regeneration module 70 is used to desorb and regenerate the desiccant in the first adsorption tower 9 or the second adsorption tower 10 with nitrogen and supply nitrogen to the adsorption module 40; the hydrogen production module 20 is used to supply hydrogen to be purified, the hydrogen deoxygenation module 30 is used to purify the hydrogen to be purified to obtain hydrogen to be mixed, and supply the hydrogen to be mixed to the adsorption module 40; the adsorption module 40 is used to purify the mixed hydrogen and nitrogen and supply the purified hydrogen and nitrogen to the synthetic ammonia module 50.

[0027] Wherein, Figure 1 is a functional block diagram of a system for synthesizing ammonia and coupling to produce hydrogen provided by an embodiment of the present application; Figure 2 is a structural schematic diagram of a system for synthesizing ammonia and coupling to produce hydrogen provided by an embodiment of the present application; Figure 3 is another structural schematic diagram of a system for synthesizing ammonia and coupling to produce hydrogen provided by an embodiment of the present application.

[0028] It should be noted that, Figure 2 and Figure 3 both use a plurality of relatively dense dotted lines with arrows to indicate the flow path of nitrogen flowing through the regeneration module 70, and use a plurality of relatively sparse dotted lines with arrows to indicate the flow path of the hydrogen-nitrogen mixture flowing through the adsorption module 40. In addition, Figure 2 uses the regeneration module 70 including the first adsorption tower 9 and the adsorption module 40 including the second adsorption tower 10 as an example, Figure 3 uses the regeneration module 70 including the second adsorption tower 10 and the adsorption module 40 including the first adsorption tower 9 as an example.

[0029] It should be noted that, compared with the prior art where different devices are respectively used to dehydrate the prepared hydrogen and nitrogen, and then an additional device is used to mix the hydrogen and nitrogen, in the ammonia synthesis coupled hydrogen production system provided by an embodiment of the present application, the device for dehydrating hydrogen and nitrogen and the device for mixing hydrogen and nitrogen are integrated. That is, the adsorption module 40 is not only used to mix hydrogen and nitrogen, but also used to dehydrate the mixed hydrogen and nitrogen, that is, dehydration treatment, which is beneficial to reducing the number of devices required for the ammonia synthesis coupled hydrogen production system and simplifying its control logic, saving equipment and instrument control investment, and thus being beneficial to reducing the investment cost of the system.

[0030] Furthermore, the hydrogen deoxygenation module 30, the nitrogen supply module 60, and the ammonia synthesis module 50 are all connected to the first adsorption tower 9 and the second adsorption tower 10 in a conductible / closable manner, so that the working states of the first adsorption tower 9 and the second adsorption tower 10 can be switched. Thus, when the regeneration module 70 includes the first adsorption tower 9, the adsorption module 40 includes the second adsorption tower 10; when the regeneration module 70 includes the second adsorption tower 10, the adsorption module 40 includes the first adsorption tower 9. In this way, not only can one of the first adsorption tower 9 or the second adsorption tower 10 be used to mix hydrogen and nitrogen and perform dehydration treatment, but also it is beneficial to use nitrogen to desorb and regenerate the desiccant in the other one of the first adsorption tower 9 or the second adsorption tower 10, enabling the regeneration module 70 and the adsorption module 40 to work simultaneously. In other words, within a fixed time period, one of the first adsorption tower 9 and the second adsorption tower 10 is used to mix hydrogen and nitrogen and dehydrate the hydrogen-nitrogen mixture, and the other one is used to desorb and regenerate the internal desiccant with the help of nitrogen.

[0031] It should be emphasized that, on the one hand, nitrogen serves both as the raw material required for ammonia synthesis and as the regeneration gas required for the first adsorption tower 9 and the second adsorption tower 10. There is no need to use an additional gas as the regeneration gas required for the first adsorption tower 9 and the second adsorption tower 10, and only need to supply nitrogen to the regeneration module 70 before supplying it to the adsorption module 40; on the other hand, compared with using hydrogen as the regeneration gas required for the first adsorption tower 9 and the second adsorption tower 10, nitrogen molecules are larger and have more water content. Under the same desorption heat, the amount of nitrogen used is smaller, so under the same dehydration conditions, the energy consumption for nitrogen regeneration is correspondingly lower. That is, the energy loss caused by using nitrogen to desorb and regenerate the desiccant in the first adsorption tower 9 or the second adsorption tower 10 is lower, and the regeneration efficiency is higher.

[0032] In some cases, after the adsorption module 40 in the ammonia synthesis coupled hydrogen production system provided by an embodiment of the present application dehydrates the mixed hydrogen and nitrogen, the purity of the hydrogen-nitrogen mixture provided to the ammonia synthesis module 50 reaches more than 99.9%.

[0033] A more detailed description of an embodiment of the present application will be given below in conjunction with the accompanying drawings.

[0034] In some embodiments, referring to Figure 2 or Figure 3 , the hydrogen production module 20 may include a water electrolysis hydrogen production unit 1 and an energy supply unit (not shown in the figure). It should be noted that the hydrogen production module 20 provided by an embodiment of the present application includes but is not limited to the water electrolysis hydrogen production unit 1. In practical applications, the hydrogen production module can also be replaced with a hydrogen production unit of other modes.

[0035] In some examples, the energy supply unit can be renewable energy such as wind energy, solar energy, water energy, and geothermal energy. Thus, compared with chemical plants using fossil fuels such as coal and natural gas as raw materials, which will emit a large amount of carbon dioxide during the hydrogen production process, exacerbating the greenhouse effect, using renewable energy such as wind energy, solar energy, water energy, and geothermal energy for water electrolysis hydrogen production is beneficial to significantly reduce carbon dioxide emissions and alleviate global warming and other negative impacts.

[0036] In some embodiments, referring to Figure 2 or Figure 3 , the hydrogen deoxidation module 30 may include: a heat exchange unit 3 communicated with the hydrogen production module 20, a hydrogen heating and deoxidation unit and a hydrogen cooling and separation unit respectively communicated with the output end of the heat exchange unit 3, and the hydrogen heating and deoxidation unit is also communicated with the input end of the heat exchange unit 3; wherein, the hydrogen heating and deoxidation unit is used for deoxidizing the hydrogen to be purified to obtain deoxidized hydrogen; the heat exchange unit 3 is provided with a first air duct and a second air duct for heat exchange with each other, the first air duct is used for transporting the hydrogen to be purified, and the second air duct is used for transporting the deoxidized hydrogen, so that the hydrogen to be purified is preheated in the heat exchange unit 3, and the deoxidized hydrogen is first cooled in the heat exchange unit 3; the hydrogen cooling and separation unit performs a second cooling and gas-liquid separation process on the deoxidized hydrogen that has experienced the first cooling to obtain the hydrogen to be mixed.

[0037] It should be emphasized that the first air duct and the second air duct provided in the heat exchange unit 3 enable the hydrogen to be purified and the deoxidized hydrogen to exchange heat. On the one hand, the waste heat of the deoxidized hydrogen can be fully utilized, and on the other hand, the power consumption of the subsequent hydrogen heating and deoxidation unit and the hydrogen cooling and separation unit can be significantly reduced, thereby being beneficial to reducing the energy consumption of the ammonia synthesis coupled hydrogen production system and improving the overall economic benefits of the ammonia synthesis coupled hydrogen production system.

[0038] Specifically, the high-temperature deoxygenated hydrogen obtained through the treatment of the hydrogen heating and deoxygenation unit will exchange heat with the low-temperature hydrogen to be purified in the heat exchange unit 3, so that the hydrogen to be purified is preheated in the heat exchange unit 3, thereby reducing the power consumption required for the subsequent hydrogen heating and deoxygenation unit to heat the hydrogen to be purified to a preset high temperature, and also cooling the deoxygenated hydrogen for the first time in the heat exchange unit 3, thereby reducing the power consumption required for the subsequent hydrogen cooling and separation unit to cool the deoxygenated hydrogen to a preset low temperature.

[0039] In some cases, referring to Figure 2 or Figure 3 , the hydrogen heating and deoxygenation unit may include a hydrogen heater 4 and a deoxidizer 5 connected in sequence; wherein, the hydrogen heater 4 is connected to the heat exchange unit 3 through a second connecting pipe 102; the deoxidizer 5 is connected to the hydrogen heater 4 through a third connecting pipe 103 and is connected to the heat exchange unit 3 through a fourth connecting pipe 104. In other examples, the hydrogen heating and deoxygenation unit may also be an integral unit. In other words, the heating treatment and deoxygenation treatment of the hydrogen to be purified can be completed in the same device.

[0040] It should be emphasized that the hydrogen heater 4 is used to heat the hydrogen to be purified that has been preheated by the heat exchange unit 3 for subsequent deoxygenation treatment of the hydrogen to be purified, and the deoxidizer 5 is used to remove the trace oxygen contained in the hydrogen to be purified.

[0041] In some examples, the treatment temperature of the hydrogen heating and deoxygenation unit for the hydrogen to be purified can be 40°C to 300°C. For example, it can be 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 140°C, 150°C, 160°C, 180°C, 200°C, 230°C, 250°C, 270°C or 280°C, etc.

[0042] In some examples, a deoxygenation catalyst is used in the hydrogen heating and deoxygenation unit for the deoxygenation reaction to remove the oxygen in the hydrogen to be purified.

[0043] In some examples, the deoxygenation catalyst may include at least one of a noble metal catalyst or a non-noble metal catalyst. Among them, the noble metal catalyst can be a platinum-based catalyst, a palladium-based catalyst or a mixed noble metal catalyst, etc.; the non-noble metal catalyst can be a copper-based catalyst, a zinc-based catalyst or a mixed non-noble metal catalyst, etc.

[0044] In some cases, referring to Figure 2 or Figure 3, the hydrogen cooling and separation unit may include a hydrogen cooler 6 and a hydrogen separator 7 connected in sequence; wherein, the hydrogen cooler 6 is connected to the heat exchange unit 3 through a fifth connecting pipe 105; the hydrogen separator 7 is connected to the hydrogen cooler 6 through a sixth connecting pipe 106. In other examples, the hydrogen cooling and separation unit may also be an integral unit. In other words, the second cooling treatment and gas-liquid separation treatment of the deoxygenated hydrogen can be completed in the same device.

[0045] It should be emphasized that the hydrogen cooler 6 is used to perform a second cooling on the deoxygenated hydrogen that has been first cooled by the heat exchange unit 3, so as to facilitate subsequent gas-liquid separation treatment of the deoxygenated hydrogen, and the hydrogen separator 7 is used to remove the trace water vapor contained in the deoxygenated hydrogen.

[0046] In some embodiments, referring to Figure 2 or Figure 3 , the nitrogen supply module 60 may include: a nitrogen release unit 2 and a nitrogen heating unit 8 connected in sequence, and the nitrogen heating unit 8 is connected to the first adsorption tower 9 and the second adsorption tower 10 in a conductible / closable manner; wherein, the nitrogen release unit 2 is used to provide initial nitrogen; the nitrogen heating unit 8 is used to heat the initial nitrogen to obtain regeneration nitrogen.

[0047] It should be emphasized that at the same moment, when the nitrogen heating unit 8 is connected to one of the first adsorption tower 9 and the second adsorption tower 10 in a conductive manner, it is connected to the other in a closed manner to realize the switching of the working states of the first adsorption tower 9 and the second adsorption tower 10. For example, referring to Figure 3 , if the nitrogen heating unit 8 is conductively connected to the second adsorption tower 10, when the regeneration module 70 includes the second adsorption tower 10, the regeneration nitrogen desorbs and regenerates the desiccant in the second adsorption tower 10, and the adsorption module 40 includes the first adsorption tower 9 to purify the mixed hydrogen and nitrogen; after the desiccant in the first adsorption tower 9 included in the adsorption module 40 absorbs a sufficient amount of water vapor and fails, referring to Figure 2 , control the nitrogen heating unit 8 to switch to be conductively connected to the first adsorption tower 9. When the regeneration module 70 includes the first adsorption tower 9, the regeneration nitrogen desorbs and regenerates the failed desiccant in the first adsorption tower 9 so that the first adsorption tower 9 can still purify the mixed hydrogen and nitrogen subsequently. At this time, the adsorption module 40 includes the second adsorption tower 10 that has undergone desorption and regeneration to continue purifying the mixed hydrogen and nitrogen.

[0048] In some examples, the purity of the initial nitrogen provided by the nitrogen release unit 2 is greater than or equal to 99.99%.

[0049] In some embodiments, referring to Figure 2 or Figure 3, the system for synthesizing ammonia coupled with hydrogen production may further include: a hydrogen flowmeter FT, which is disposed on the first connecting pipe 101 connecting the hydrogen production module 20 and the hydrogen deoxidation module 30 to detect the flow rate of the hydrogen to be purified provided by the hydrogen production module 20 to the hydrogen deoxidation module 30; a nitrogen flow control valve V2, which is disposed in the nitrogen supply module 60, and the nitrogen flow control valve V2 is used to control the nitrogen flow rate provided by the nitrogen supply module 60 to the regeneration module 70; a dynamic adjustment module 80, which is electrically connected to the hydrogen flowmeter FT and the nitrogen flow control valve V2, and the dynamic adjustment module 80 is configured to control the opening degree of the nitrogen flow control valve V2 based on the flow rate of the hydrogen to be purified, so as to control the magnitude of the nitrogen flow rate provided by the nitrogen supply module 60 to the regeneration module 70.

[0050] In some cases, in the hydrogen production module 20, in the step of electrolyzing water to produce hydrogen using renewable energy such as wind energy, solar energy, water energy, and geothermal energy, due to the volatility of the electricity provided by renewable energy such as wind energy, solar energy, water energy, and geothermal energy, it affects the instantaneous flow rate of the hydrogen to be purified provided by the hydrogen production module 20. In other words, the flow rate of the hydrogen to be purified provided by the hydrogen production module 20 also has a certain degree of volatility. Based on this, the hydrogen flowmeter FT is designed to detect the flow rate of the hydrogen to be purified provided by the hydrogen production module 20 to the hydrogen deoxidation module 30 and feedback it to the dynamic adjustment module 80. Then, with the help of the dynamic adjustment module 80, the opening degree of the nitrogen flow control valve V2 is controlled based on the flow rate of the hydrogen to be purified, so as to control the magnitude of the nitrogen flow rate provided, which is beneficial to enabling the system for synthesizing ammonia coupled with hydrogen production to adapt to the volatility of the hydrogen production module 20, improving the operability of the system, and realizing the dynamic coupling of the hydrogen production module 20 and the ammonia synthesis module 50, solving the excessive problem between the hydrogen production module 20 and the ammonia synthesis module 50, so as to ensure the stable progress of the production process.

[0051] It should be noted that based on the design of the hydrogen flowmeter FT, the nitrogen flow control valve V2, and the dynamic adjustment module 80, it can be realized that the magnitude of the nitrogen flow rate provided to the regeneration module 70 depends on the instantaneous flow rate of the hydrogen to be purified provided by the hydrogen production module 20. In other words, when the instantaneous flow rate of the hydrogen to be purified provided by the hydrogen production module 20 detected by the hydrogen flowmeter FT increases, the dynamic adjustment module 80 controls the nitrogen flow control valve V2 to increase the nitrogen flow rate provided to the regeneration module 70; when the instantaneous flow rate of the hydrogen to be purified provided by the hydrogen production module 20 detected by the hydrogen flowmeter FT decreases, the dynamic adjustment module 80 controls the nitrogen flow control valve V2 to decrease the nitrogen flow rate provided to the regeneration module 70, so as to control the hydrogen and nitrogen provided to the adsorption module 40 and the ammonia synthesis module 50 within a certain proportion range during a certain period of time under the condition of the flow rate fluctuation of the hydrogen to be purified provided by the hydrogen production module 20, avoiding excessive loss of hydrogen and ammonia during the ammonia synthesis process, so as to improve the synthesis efficiency of the ammonia synthesis module 50.

[0052] In some cases, refer toFigure 2 or Figure 3 The nitrogen supply module 60 may include: a nitrogen release unit 2 and a nitrogen heating unit 8 that are connected in sequence. A nitrogen flow control valve V2 is disposed on a first connecting pipe 201 connecting the nitrogen release unit 2 and the nitrogen heating unit 8 to control the magnitude of the nitrogen flow provided by the nitrogen supply module 60 to the regeneration module 70.

[0053] In some cases, the dynamic adjustment module 80 may include a calculator FY and a nitrogen flow controller FC that are electrically connected to each other; wherein, the calculator FY is electrically connected to a hydrogen flow meter FT. The calculator FY is configured to receive and calculate the flow of nitrogen required for synthesizing ammonia based on the flow of the hydrogen to be purified detected by the hydrogen flow meter FT, and feedback the flow of nitrogen required for synthesizing ammonia to the nitrogen flow controller FC; the nitrogen flow controller FC is configured to control the opening degree of the nitrogen flow control valve V2 based on the received flow of nitrogen required for synthesizing ammonia.

[0054] In some embodiments, referring to Figure 2 or Figure 3 The dynamic adjustment module 80 may also be configured to calculate the total introduction amount of the hydrogen to be purified based on the flow of the hydrogen to be purified and the flow-through time of the hydrogen to be purified on the first connecting pipe 101. When the total introduction amount reaches a preset value, one of the first adsorption tower 9 and the second adsorption tower 10 included in the regeneration module 70 is switched to the other.

[0055] It should be emphasized that the total amount of water that the desiccant used for dehydrating the mixed hydrogen and nitrogen in the first adsorption tower 9 and the second adsorption tower 10 can adsorb at one time is fixed. When the amount of water adsorbed by the desiccant reaches the saturation state, it can no longer effectively dehydrate the subsequent introduced mixed hydrogen and nitrogen. Based on this, the dynamic adjustment module 80 is designed to, when the total introduction amount of the hydrogen to be purified reaches a preset value, in combination with referring to Figure 2 and Figure 3 switch one of the first adsorption tower 9 and the second adsorption tower 10 included in the regeneration module 70 to the other, so as to timely desorb and regenerate the desiccant whose adsorbed water amount in one of the first adsorption tower 9 and the second adsorption tower 10 reaches the saturation state. In this way, by fixing the total introduction amount of the hydrogen to be purified with the dynamic adjustment module 80, the dynamic adsorption and regeneration process of the first adsorption tower 9 and the second adsorption tower 10 can be realized.

[0056] In some embodiments, referring to Figure 2 or Figure 3, a third connecting pipe 203 is connected between the nitrogen supply module 60 and the first adsorption tower 9, and a fourth connecting pipe 204 is connected between the nitrogen supply module 60 and the second adsorption tower 10; the system for synthesizing ammonia and coupling to produce hydrogen may further include: a third switching valve V3, which is arranged on the third connecting pipe 203 and is used to control the conduction or closing of the third connecting pipe 203; a fourth switching valve V4, which is arranged on the fourth connecting pipe 204 and is used to control the conduction or closing of the fourth connecting pipe 204; wherein, the third switching valve V3 and the fourth switching valve V4 are alternately conducted at the same time; when the third switching valve V3 is conducted, the regeneration module 70 includes the first adsorption tower 9, and the second adsorption tower 10 constitutes the adsorption module 40; when the fourth switching valve V4 is conducted, the regeneration module 70 includes the second adsorption tower 10, and the first adsorption tower 9 constitutes the adsorption module 40.

[0057] It can be understood that both the third switching valve V3 and the fourth switching valve V4 are used to control whether to provide regeneration nitrogen, so the adsorption tower corresponding to the one of the third switching valve V3 and the fourth switching valve V4 that is conducted is the adsorption tower included in the regeneration module 70.

[0058] In some cases, the system for synthesizing ammonia and coupling to produce hydrogen may further include: a second connecting pipe 202, one end of the second connecting pipe 202 is connected to the nitrogen supply module 60, and the other end is respectively connected to the third connecting pipe 203 and the fourth connecting pipe 204 to respectively realize the connection between the nitrogen supply module 60 and the first adsorption tower 9 and the second adsorption tower 10.

[0059] In other cases, the nitrogen supply module may be independently provided with two nitrogen discharge outlets, one of the two nitrogen discharge outlets is directly connected to the first adsorption tower through the third connecting pipe, and the other is directly connected to the second adsorption tower through the fourth connecting pipe.

[0060] In some embodiments, referring to Figure 2 or Figure 3 , the nitrogen provided by the nitrogen supply module 60 to the regeneration module 70 is regeneration nitrogen, and the regeneration nitrogen desorbs and regenerates the desiccant in the first adsorption tower 9 or the second adsorption tower 10 to obtain the nitrogen to be separated; the regeneration module 70 may further include: a nitrogen cooling and separation unit, which is connected to the first adsorption tower 9 and the second adsorption tower 10 in a conductible / closable manner and is connected to the hydrogen deoxygenation module 30; the nitrogen cooling and separation unit is configured to perform cooling and gas-liquid separation processing on the nitrogen to be separated to obtain the nitrogen to be mixed.

[0061] It should be noted that the water content of the nitrogen to be separated obtained after desorbing and regenerating the desiccant in the first adsorption tower 9 or the second adsorption tower 10 increases, so it is necessary to perform a gas-liquid separation process on the nitrogen to be separated to ensure a higher purity of the nitrogen supplied to the ammonia synthesis module 50 subsequently.

[0062] In some cases, reference Figure 2 or Figure 3 , a fifth connecting pipe 205 is connected between the first adsorption tower 9 and the nitrogen cooling and separation unit, and a sixth connecting pipe 206 is connected between the second adsorption tower 10 and the nitrogen cooling and separation unit; the system for synthesizing ammonia and coupling to produce hydrogen may further include: a fifth switching valve V5, disposed on the fifth connecting pipe 205 for controlling the fifth connecting pipe 205 to be turned on or off; a sixth switching valve V6, disposed on the sixth connecting pipe 206 for controlling the sixth connecting pipe 206 to be turned on or off; wherein, the fifth switching valve V5 and the sixth switching valve V6 are selectively turned on at the same time.

[0063] In some examples, the system for synthesizing ammonia and coupling to produce hydrogen may further include: a seventh connecting pipe 207, one end of the seventh connecting pipe 207 is connected to the nitrogen cooling and separation unit, and the other end is respectively connected to the fifth connecting pipe 205 and the sixth connecting pipe 206 to respectively realize the connection between the nitrogen cooling and separation unit and the first adsorption tower 9 and the second adsorption tower 10. In other examples, the nitrogen cooling and separation unit may be independently provided with two nitrogen discharge inlets, and one of the two nitrogen discharge inlets is directly connected to the first adsorption tower through the fifth connecting pipe, and the other is directly connected to the second adsorption tower through the sixth connecting pipe.

[0064] In some examples, reference Figure 2 or Figure 3 , the nitrogen cooling and separation unit may include a nitrogen cooler 11 and a nitrogen separator 12 connected in sequence; wherein, the nitrogen cooler 11 is respectively connected to the first adsorption tower 9 and the second adsorption tower 10 through the fifth connecting pipe 205, the sixth connecting pipe 206 and the seventh connecting pipe 207; the nitrogen separator 12 is connected to the nitrogen cooler 11 through an eighth connecting pipe 208 and is connected to the hydrogen deoxygenation module 30 through a ninth connecting pipe 209. In one example, the nitrogen separator 12 is connected to the hydrogen separator 7 in the hydrogen deoxygenation module 30 through the ninth connecting pipe 209.

[0065] It should be emphasized that the nitrogen cooler 11 is used to cool the nitrogen to be separated to facilitate subsequent gas-liquid separation treatment of the nitrogen to be separated, and the nitrogen separator 12 is used to remove the water vapor contained in the nitrogen to be separated.

[0066] In other examples, the nitrogen cooling and separation unit may also be an integral unit. In other words, the cooling treatment and gas-liquid separation treatment of the nitrogen to be separated can be completed in the same device.

[0067] In some cases, reference Figure 2 or Figure 3, both the nitrogen cooling and separation unit and the hydrogen deoxygenation module 30 are connected to the seventh connecting pipe 107. There is an eighth connecting pipe 108 connecting the seventh connecting pipe 107 and the first adsorption tower 9, and a ninth connecting pipe 109 connecting the seventh connecting pipe 107 and the second adsorption tower 10. In this way, it is beneficial to simplify the pipeline layout between the nitrogen cooling and separation unit, the hydrogen deoxygenation module 30, the first adsorption tower 9 and the second adsorption tower 10.

[0068] In this way, the hydrogen to be mixed discharged from the hydrogen deoxygenation module 30 and the nitrogen to be mixed discharged from the nitrogen cooling and separation unit are preliminarily mixed in the seventh connecting pipe 107, and then enter the adsorption module 40 for sufficient mixing and dehydration treatment. In other words, the hydrogen deoxygenation module 30 and the regeneration module 70 use the seventh connecting pipe 107 to mix the hydrogen to be mixed and the nitrogen to be mixed and then transfer them to the adsorption module 40.

[0069] In other cases, the hydrogen to be mixed discharged from the hydrogen deoxygenation module can be independently transferred to the first adsorption tower and the second adsorption tower, and the nitrogen to be mixed discharged from the nitrogen cooling and separation unit can also be independently transferred to the first adsorption tower and the second adsorption tower. In other words, the hydrogen to be mixed and the nitrogen to be mixed are initially mixed in the adsorption module.

[0070] Continue to refer to Figure 2 or Figure 3 , the hydrogen production system by coupling ammonia synthesis may further include: a seventh switching valve V7, arranged on the eighth connecting pipe 108, for controlling the conduction or closing of the eighth connecting pipe 108; an eighth switching valve V8, arranged on the ninth connecting pipe 109, for controlling the conduction or closing of the ninth connecting pipe 109; wherein, the seventh switching valve V7 and the eighth switching valve V8 are selectively conducted at the same time.

[0071] It can be understood that both the seventh switching valve V7 and the eighth switching valve V8 are used to control whether to provide the mixed hydrogen and nitrogen. Then, the adsorption tower corresponding to the one of the seventh switching valve V7 and the eighth switching valve V8 that is conducted is the adsorption tower included in the adsorption module 40.

[0072] In some embodiments, refer to Figure 2 or Figure 3 , there is a tenth connecting pipe 110 connecting the first adsorption tower 9 and the ammonia synthesis module 50, and an eleventh connecting pipe 111 connecting the second adsorption tower 10 and the ammonia synthesis module 50; the hydrogen production system by coupling ammonia synthesis may further include: a ninth switching valve V9, arranged on the tenth connecting pipe 110, for controlling the conduction or closing of the tenth connecting pipe 110; a tenth switching valve V10, arranged on the eleventh connecting pipe 111, for controlling the conduction or closing of the eleventh connecting pipe 111; wherein, the ninth switching valve V9 and the tenth switching valve V10 are selectively conducted at the same time.

[0073] In some cases, the system for synthesizing ammonia and coupling to produce hydrogen may further include: a twelfth connecting pipe 112, one end of the twelfth connecting pipe 112 communicates with the ammonia synthesis module 50, and the other end communicates with the tenth connecting pipe 110 and the eleventh connecting pipe 111 respectively, so as to respectively realize the connection between the ammonia synthesis module 50 and the first adsorption tower 9 and the second adsorption tower 10.

[0074] In other cases, the ammonia synthesis module may independently be provided with two receiving ports for hydrogen-nitrogen mixed gas. One of the two receiving ports for hydrogen-nitrogen mixed gas is directly connected to the first adsorption tower through the tenth connecting pipe, and the other is directly connected to the second adsorption tower through the eleventh connecting pipe.

[0075] It should be noted that, in some cases, referring to Figure 2 , when the regeneration module 70 includes the first adsorption tower 9 and the adsorption module 40 includes the second adsorption tower 10, the third switching valve V3 and the fifth switching valve V5 connected to the first adsorption tower 9 are opened, and the seventh switching valve V7 and the ninth switching valve V9 are closed. The eighth switching valve V8 and the tenth switching valve V10 connected to the second adsorption tower 10 are opened, and the fourth switching valve V4 and the sixth switching valve V6 are closed.

[0076] In other cases, referring to Figure 3 , when the regeneration module 70 includes the second adsorption tower 10 and the adsorption module 40 includes the first adsorption tower 9, the seventh switching valve V7 and the ninth switching valve V9 connected to the first adsorption tower 9 are opened, and the third switching valve V3 and the fifth switching valve V5 are closed. The fourth switching valve V4 and the sixth switching valve V6 connected to the second adsorption tower 10 are opened, and the eighth switching valve V8 and the tenth switching valve V10 are closed.

[0077] In some embodiments, referring to Figure 2 or Figure 3 , the system for synthesizing ammonia and coupling to produce hydrogen may further include: a water treatment module 90, which communicates with the hydrogen deoxygenation module 30 through a thirteenth connecting pipe 113 and communicates with the regeneration module 70 through a tenth connecting pipe 210, so as to discharge the water separated from the hydrogen to be purified in the hydrogen deoxygenation module 30 and the water separated from the nitrogen in the regeneration module 70.

[0078] In some examples, the thirteenth connecting pipe 113 communicates the hydrogen separator 7 and the water treatment module 90, and the tenth connecting pipe 210 communicates the nitrogen separator 12 and the water treatment module 90.

[0079] In some cases, referring to Figure 2 or Figure 3, the thirteenth connecting pipe 113 and the tenth communicating pipe 210 are aggregated and then communicated with the water treatment module 90. In other cases, the water treatment module may be independently provided with two water treatment receiving ports. One of the two water treatment receiving ports is directly communicated to the hydrogen deoxidation module through the thirteenth connecting pipe, and the other is directly communicated to the regeneration module through the tenth communicating pipe.

[0080] In summary, the equipment for dehydrating hydrogen and nitrogen and the equipment for mixing hydrogen and nitrogen are integrated. That is, the adsorption module 40 is not only used for mixing hydrogen and nitrogen, but also for dehydrating the mixed hydrogen and nitrogen, which is beneficial to reducing the number of equipment required for the ammonia synthesis coupled hydrogen production system and simplifying its control logic, saving equipment and instrument control investment, and thus beneficial to reducing the investment cost of the system. Further, the hydrogen deoxidation module 30, the nitrogen supply module 60, and the ammonia synthesis module 50 are all connected to the first adsorption tower 9 and the second adsorption tower 10 in a conductible / closable manner, so that the working states of the first adsorption tower 9 and the second adsorption tower 10 can be switched. In this way, not only can one of the first adsorption tower 9 or the second adsorption tower 10 be used to mix and dehydrate hydrogen and nitrogen, but also it is beneficial to use nitrogen to desorb and regenerate the desiccant in the other of the first adsorption tower 9 or the second adsorption tower 10, so that the regeneration module 70 and the adsorption module 40 can work simultaneously. It should be emphasized that, on the one hand, nitrogen is both the raw material required for ammonia synthesis and the regeneration gas required for the first adsorption tower 9 and the second adsorption tower 10, and there is no need to use additional gas as the regeneration gas required for the first adsorption tower 9 and the second adsorption tower 10; on the other hand, compared with using hydrogen as the regeneration gas required for the first adsorption tower 9 and the second adsorption tower 10, nitrogen molecules are larger and have more water content. Under the same desorption heat, the amount of nitrogen used is smaller, so under the same dehydration conditions, the energy consumption for nitrogen regeneration is correspondingly lower and the regeneration efficiency is higher.

[0081] Another embodiment of the present application also provides a method for coupling ammonia synthesis and hydrogen production, which is used in the ammonia synthesis coupled hydrogen production system provided in the foregoing embodiment. The method for coupling ammonia synthesis and hydrogen production provided in another embodiment of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the same or corresponding parts as those in the foregoing embodiment will not be described in detail here.

[0082] With reference to Figures 1 to 3, the method for coupling ammonia synthesis and hydrogen production includes: providing and utilizing the hydrogen production module 20 to provide hydrogen to be purified; providing a hydrogen deoxidation module 30 connected to the hydrogen production module 20, and using the hydrogen deoxidation module 30 to purify the hydrogen to be purified to obtain hydrogen to be mixed, and providing the hydrogen to be mixed to an adsorption module 40 connected to the hydrogen deoxidation module 30; providing a nitrogen supply module and a regeneration module 70 connected in sequence, and the regeneration module 70 is connected to the adsorption module 40, and using the nitrogen supply module to provide nitrogen to the regeneration module 70, using nitrogen to desorb and regenerate the desiccant in one of the first adsorption tower 9 and the second adsorption tower 10 included in the regeneration module 70, and providing nitrogen to the adsorption module 40 including the other of the first adsorption tower 9 and the second adsorption tower 10; using the adsorption module 40 to purify the mixed hydrogen and nitrogen, and providing the purified hydrogen and nitrogen to an ammonia synthesis module 50 connected to the adsorption module 40.

[0083] It should be emphasized that when using the ammonia synthesis coupled hydrogen production system provided in the foregoing embodiment to prepare ammonia, only the first adsorption tower 9 and the second adsorption tower 10 need to be switched, which is beneficial to simplifying the control logic of the ammonia synthesis coupled hydrogen production system. Further, the regeneration module 70 and the adsorption module 40 can work simultaneously. Nitrogen is used as the regeneration gas required for the first adsorption tower 9 and the second adsorption tower 10, without the need to use additional gas as the regeneration gas required for the first adsorption tower 9 and the second adsorption tower 10. And under the same dehydration conditions, the energy consumption of nitrogen regeneration is correspondingly lower, and the regeneration efficiency is higher, which is beneficial to reducing the cost and energy consumption of preparing ammonia and improving the efficiency of preparing ammonia.

[0084] In addition, when using the ammonia synthesis coupled hydrogen production system provided in the foregoing embodiment to prepare ammonia, it can adapt to the volatility of the hydrogen production module 20, improve the operability of the system, and realize the dynamic coupling of the hydrogen production module 20 and the ammonia synthesis module 50, solve the problem of mismatch in the processing capacity between the hydrogen production module 20 and the ammonia synthesis module 50, so as to ensure the stable progress of the production process.

[0085] In some embodiments, using the hydrogen deoxidation module 30 to purify the hydrogen to be purified to obtain hydrogen to be mixed may include the following steps:

[0086] Provide a heat exchange unit 3 connected to the hydrogen production module 20. The heat exchange unit 3 is provided with a first air duct and a second air duct for heat exchange with each other. Use the first air duct to transport the hydrogen to be purified, and use the second air duct to transport the deoxidized hydrogen, so that the hydrogen to be purified is preheated in the heat exchange unit 3, and the deoxidized hydrogen is cooled for the first time in the heat exchange unit 3. The subsequent steps of the heat exchange unit 3 receiving the deoxidized hydrogen will be described in detail.

[0087] A hydrogen heating and deoxidation unit and a hydrogen cooling and separation unit are provided, which are respectively connected to the output end of the heat exchange unit 3. The hydrogen heating and deoxidation unit is also connected to the input end of the heat exchange unit 3. The hydrogen heating and deoxidation unit is used to deoxidize the hydrogen to be purified to obtain deoxidized hydrogen, and the hydrogen cooling and separation unit is used to perform secondary cooling and gas-liquid separation on the deoxidized hydrogen that has undergone the first cooling to obtain hydrogen to be mixed.

[0088] In some embodiments, the method for coupling ammonia synthesis and hydrogen production can be roughly divided into five processes: deoxidation, primary cooling and separation, adsorption, regeneration, and secondary cooling and separation. The flow directions of the materials in each process are as follows:

[0089] Process I: In the deoxidation process, the hydrogen to be purified from the electrolytic water hydrogen production unit 1 is metered by the hydrogen flowmeter FT on the first connecting pipe 101, and then exchanges heat with the deoxidized hydrogen transmitted through the fourth connecting pipe 104 after being deoxidized by the deoxidizer 5 in the heat exchange unit 3. The preheated hydrogen to be purified is sent to the hydrogen heater 4 for heat preservation through the second connecting pipe 102, and then is transported to the deoxidizer 5 through the third connecting pipe 103 for deoxidation reaction.

[0090] Process II: In the primary cooling and separation process, the deoxidized hydrogen passing through the heat exchange unit 3 is cooled for the first time, and then is transported to the hydrogen cooler 6 through the fifth connecting pipe 105 for secondary cooling. After cooling, it is transported to the hydrogen separator 7 through the sixth connecting pipe 106 to separate water and hydrogen.

[0091] Process III: In the adsorption process, the hydrogen to be mixed from the hydrogen separator 7 and the nitrogen to be mixed from the nitrogen separator 12 are mixed and first pass through the seventh connecting pipe 107. Then, the seventh switch valve V7 and the ninth switch valve V9 are opened, and the eighth switch valve V8 and the tenth switch valve V10 are closed, so as to be transported to the first adsorption tower 9 through the eighth connecting pipe 108 for water adsorption removal, and then are transported to the ammonia synthesis module 50 through the tenth connecting pipe 110 and the twelfth connecting pipe 112; or, the eighth switch valve V8 and the tenth switch valve V10 are opened, and the seventh switch valve V7 and the ninth switch valve V9 are closed, so as to be transported to the second adsorption tower 10 through the ninth connecting pipe 109 for water adsorption removal, and then are transported to the ammonia synthesis module 50 through the eleventh connecting pipe 111 and the twelfth connecting pipe 112.

[0092] Process IV: In the regeneration process, the nitrogen flow rate on the first connecting pipe 201 is controlled based on the dynamic adjustment module 80. Specifically, the initial nitrogen from the nitrogen release unit 2 passes through the nitrogen flow regulating valve V2 on the first connecting pipe 201 and is transported to the nitrogen heating unit 8, then to the second connecting pipe 202. Then, the fourth switching valve V4 and the sixth switching valve V6 are opened, and the third switching valve V3 and the fifth switching valve V5 are closed, so as to be transported to the second adsorption tower 10 through the fourth connecting pipe 204 for desorption regeneration, and then transported to the nitrogen cooler 11 through the sixth connecting pipe 206 and the seventh connecting pipe 207; or, the third switching valve V3 and the fifth switching valve V5 are opened, and the fourth switching valve V4 and the sixth switching valve V6 are closed, so as to be transported to the first adsorption tower 9 through the third connecting pipe 203 for desorption regeneration, and then transported to the nitrogen cooler 11 through the fifth connecting pipe 205 and the seventh connecting pipe 207.

[0093] Process V: In the secondary cooling and separation process, the nitrogen to be separated from the first adsorption tower 9 or the second adsorption tower 10 enters the nitrogen cooler 11 for cooling, and then is transported to the nitrogen separator 12 through the eighth connecting pipe 208 for gas-liquid separation. After cooling, it is transported to the seventh connecting pipe 107 through the ninth connecting pipe 209 to be mixed with the hydrogen to be mixed.

[0094] In addition, the waste water from the hydrogen separator 7 and the nitrogen separator 12 is transported to the water treatment module 14 through the thirteenth connecting pipe 113 and the tenth connecting pipe 210 respectively.

[0095] Those of ordinary skill in the art can understand that the above embodiments are specific examples for implementing the present application. In actual applications, various changes can be made in form and details without departing from the spirit and scope of the embodiments of the present application. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be subject to the scope defined by the claims.

Claims

1. A system for synthesizing ammonia and coupling to produce hydrogen, characterized in that, Comprising: A hydrogen production module, a hydrogen deoxidation module, an adsorption module, and an ammonia synthesis module that are connected in sequence; A nitrogen supply module and a regeneration module that are connected in sequence, and the regeneration module is connected to the adsorption module; Wherein, when the regeneration module includes a first adsorption tower, the adsorption module includes a second adsorption tower; when the regeneration module includes the second adsorption tower, the adsorption module includes the first adsorption tower; the hydrogen deoxidation module, the nitrogen supply module, and the ammonia synthesis module are all connected to the first adsorption tower and the second adsorption tower in a conductible / closable manner; The nitrogen supply module is used to supply nitrogen to the regeneration module, and the regeneration module is used to desorb and regenerate the desiccant in the first adsorption tower or the second adsorption tower with nitrogen and supply nitrogen to the adsorption module; The hydrogen production module is used to supply hydrogen to be purified, and the hydrogen deoxidation module is used to purify the hydrogen to be purified to obtain hydrogen to be mixed and supply the hydrogen to be mixed to the adsorption module; The adsorption module is used to dehydrate the mixed hydrogen and nitrogen and supply the dehydrated hydrogen and nitrogen to the ammonia synthesis module.

2. The system for synthesizing ammonia and coupling to produce hydrogen according to claim 1, wherein The hydrogen deoxidation module includes: a heat exchange unit connected to the hydrogen production module, a hydrogen heating and deoxidation unit and a hydrogen cooling and separation unit respectively connected to the output end of the heat exchange unit, and the hydrogen heating and deoxidation unit is also connected to the input end of the heat exchange unit; Wherein, the hydrogen heating and deoxidation unit is used to deoxidize the hydrogen to be purified to obtain deoxidized hydrogen; a first air duct and a second air duct for mutual heat exchange are arranged in the heat exchange unit, the first air duct is used to transport the hydrogen to be purified, and the second air duct is used to transport the deoxidized hydrogen, so that the hydrogen to be purified is preheated in the heat exchange unit, and the deoxidized hydrogen is first cooled in the heat exchange unit; the hydrogen cooling and separation unit performs a second cooling and gas-liquid separation treatment on the deoxidized hydrogen that has undergone the first cooling to obtain the hydrogen to be mixed.

3. The system for synthesizing ammonia coupled with hydrogen production according to claim 1, wherein The nitrogen supply module includes: a nitrogen release unit and a nitrogen heating unit that are connected in sequence, and the nitrogen heating unit is connected to the first adsorption tower and the second adsorption tower in a conductible / closable manner; Wherein, the nitrogen release unit is used to provide initial nitrogen; the nitrogen heating unit is used to heat the initial nitrogen to obtain regenerated nitrogen.

4. The system for synthesizing ammonia and coupling to produce hydrogen according to claim 1 or 3, characterized in that, Further comprising: A hydrogen flowmeter, arranged on a first connecting pipe connecting the hydrogen production module and the hydrogen deoxidation module to detect the flow rate of the hydrogen to be purified provided by the hydrogen production module to the hydrogen deoxidation module; A nitrogen flow control valve, arranged in the nitrogen supply module, and the nitrogen flow control valve is used to control the nitrogen flow rate provided by the nitrogen supply module to the regeneration module; A dynamic adjustment module, electrically connected to the hydrogen flowmeter and the nitrogen flow control valve, and the dynamic adjustment module is configured to control the opening degree of the nitrogen flow control valve based on the flow rate of the hydrogen to be purified to control the magnitude of the nitrogen flow rate provided by the nitrogen supply module to the regeneration module.

5. The system for synthesizing ammonia and coupling to produce hydrogen according to claim 4, wherein The dynamic adjustment module is further configured to calculate the total input amount of the hydrogen to be purified based on the flow rate of the hydrogen to be purified and the flow-through time of the hydrogen to be purified on the first connecting pipe, and when the total input amount reaches a preset value, switch one of the first adsorption tower and the second adsorption tower included in the regeneration module to the other.

6. The system for synthesizing ammonia and coupling hydrogen production according to claim 1, wherein A third communication pipe is connected between the nitrogen supply module and the first adsorption tower, and a fourth communication pipe is connected between the nitrogen supply module and the second adsorption tower; The system for coupling ammonia synthesis and hydrogen production further includes: A third switching valve is arranged on the third communication pipe for controlling the third communication pipe to be conducted or closed; A fourth switching valve is arranged on the fourth communication pipe for controlling the fourth communication pipe to be conducted or closed; Wherein, the third switching valve and the fourth switching valve are alternatively conducted at the same time; when the third switching valve is conducted, the regeneration module includes the first adsorption tower, and the second adsorption tower constitutes the adsorption module; when the fourth switching valve is conducted, the regeneration module includes the second adsorption tower, and the first adsorption tower constitutes the adsorption module.

7. The system for synthesizing ammonia and coupling hydrogen production according to claim 1, wherein The nitrogen provided by the nitrogen supply module to the regeneration module is regeneration nitrogen, and the regeneration nitrogen desorbs and regenerates the desiccant in the first adsorption tower or the second adsorption tower to obtain the nitrogen to be separated; The regeneration module further includes: a nitrogen cooling and separation unit, which is connected to the first adsorption tower and the second adsorption tower in a conductible / closable manner and is connected to the hydrogen deoxygenation module; The nitrogen cooling and separation unit is configured to cool and perform gas-liquid separation on the nitrogen to be separated to obtain the nitrogen to be mixed.

8. The system for synthesizing ammonia and coupling hydrogen production according to claim 7, wherein A fifth communication pipe is connected between the first adsorption tower and the nitrogen cooling and separation unit, and a sixth communication pipe is connected between the second adsorption tower and the nitrogen cooling and separation unit; The system for coupling ammonia synthesis and hydrogen production further includes: A fifth switching valve is arranged on the fifth communication pipe for controlling the fifth communication pipe to be conducted or closed; A sixth switching valve is arranged on the sixth communication pipe for controlling the sixth communication pipe to be conducted or closed; Wherein, the fifth switching valve and the sixth switching valve are alternatively conducted at the same time.

9. The system for synthesizing ammonia and coupling to produce hydrogen according to claim 7, wherein, Both the nitrogen cooling and separation unit and the hydrogen deoxygenation module are connected to a seventh connecting pipe, an eighth connecting pipe is connected between the seventh connecting pipe and the first adsorption tower, and a ninth connecting pipe is connected between the seventh connecting pipe and the second adsorption tower; The system for coupling ammonia synthesis and hydrogen production further includes: A seventh switching valve is arranged on the eighth connecting pipe for controlling the eighth connecting pipe to be conducted or closed; An eighth switching valve is arranged on the ninth connecting pipe for controlling the ninth connecting pipe to be conducted or closed; Wherein, the seventh switching valve and the eighth switching valve are alternatively conducted at the same time.

10. A method for coupling ammonia synthesis and hydrogen production, characterized in that, Including: Providing and utilizing the hydrogen production module to provide hydrogen to be purified; Provide a hydrogen deoxidation module connected to the hydrogen production module, and use the hydrogen deoxidation module to purify the hydrogen to be purified to obtain hydrogen to be mixed, and provide the hydrogen to be mixed to an adsorption module connected to the hydrogen deoxidation module; Provide a nitrogen supply module and a regeneration module connected in sequence, and the regeneration module is connected to the adsorption module. Use the nitrogen supply module to supply nitrogen to the regeneration module, use nitrogen to desorb and regenerate the desiccant in one of the first adsorption tower and the second adsorption tower included in the regeneration module, and supply nitrogen to the adsorption module including the other of the first adsorption tower and the second adsorption tower; Use the adsorption module to dehydrate the mixed hydrogen and nitrogen, and provide the dehydrated hydrogen and nitrogen to an ammonia synthesis module connected to the adsorption module.

11. The method for coupling ammonia synthesis and hydrogen production according to claim 10, characterized in that, The step of using the hydrogen deoxidation module to purify the hydrogen to be purified to obtain the hydrogen to be mixed includes: Provide a heat exchange unit connected to the hydrogen production module. The heat exchange unit is provided with a first air duct and a second air duct for heat exchange with each other. Use the first air duct to transport the hydrogen to be purified, and use the second air duct to transport deoxidized hydrogen, so that the hydrogen to be purified is preheated in the heat exchange unit, and the deoxidized hydrogen is first cooled in the heat exchange unit; Provide a hydrogen heating and deoxidation unit and a hydrogen cooling and separation unit respectively connected to the output end of the heat exchange unit. The hydrogen heating and deoxidation unit is also connected to the input end of the heat exchange unit. Use the hydrogen heating and deoxidation unit to deoxidize the hydrogen to be purified to obtain the deoxidized hydrogen, and use the hydrogen cooling and separation unit to perform a second cooling and gas-liquid separation treatment on the deoxidized hydrogen that has experienced the first cooling to obtain the hydrogen to be mixed.

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