A green ammonia synthesis reactor, method and application

Abstract

This invention discloses a green ammonia synthesis reactor, method, and application. The green ammonia synthesis reactor includes a first reaction bed, a second reaction bed, at least one third reaction bed, a first heat exchanger, a second heat exchanger, at least one third heat exchanger, and a shell. The tube sides of the third heat exchanger, the second heat exchanger, and the first heat exchanger are sequentially connected, allowing the feed gas to flow from the tube side inlet of the third heat exchanger to the tube side outlet of the first heat exchanger, and to be heated step-by-step during the flow. The shell is provided with a first inlet, a second inlet, a third inlet, and a fourth inlet. The first inlet is connected to the tube side inlet of the third heat exchanger; the second inlet is connected to the tube side inlet of the second heat exchanger; the third inlet is connected to the tube side inlet of the first heat exchanger; and the fourth inlet is connected to the tube side outlet of the first heat exchanger. This green ammonia synthesis reactor can control the temperature of the feed gas before the reaction, achieving a wider range of rapid and flexible load adjustment.

Description

Technical Field

[0001] This invention relates to the field of chemical reaction technology, and in particular to a green ammonia synthesis reactor, method, and application. Background Technology

[0002] Hydrogen energy, as a high-calorific-value energy carrier, has made green hydrogen a new development direction for my country's energy supply. Currently, more than 90% of hydrogen comes from fossil fuels, and the production process is accompanied by carbon dioxide emissions. Green ammonia synthesis technology uses hydrogen and nitrogen units from water electrolysis as raw materials, and the ammonia synthesis process is not significantly different from the traditional ammonia synthesis process.

[0003] An ammonia synthesis reactor is a device used for the ammonia synthesis reaction. Existing ammonia synthesis reactors mainly include quench-type ammonia synthesis reactors, indirect-cooling ammonia synthesis reactors, and internal-cooling ammonia synthesis reactors. The working principle of the indirect-cooling ammonia synthesis reactor is as follows: two to three indirect heat exchangers are arranged in the catalyst bed to carry out an adiabatic reaction, which raises the temperature. After the reaction, the hot gas enters the outside of the heat exchanger tubes, cools down, and then reacts again. The reaction bed is equipped with two or three indirect heat exchangers, which can repeat the heat exchange three to four times. Summary of the Invention

[0004] To enrich the types of ammonia synthesis reactors, increase the selection space for ammonia synthesis reactors, and improve the adaptability of ammonia synthesis reactors, embodiments of the present invention provide a green ammonia synthesis reactor, method, and application.

[0005] In a first aspect, embodiments of the present invention provide a green ammonia synthesis reactor, comprising a first reaction bed, a second reaction bed, at least one third reaction bed, a first heat exchanger, a second heat exchanger, at least one third heat exchanger, and a shell;

[0006] The first reaction bed, the second reaction bed, and the at least one third reaction bed are arranged sequentially from top to bottom inside the outer shell;

[0007] The first heat exchanger is disposed inside the first reaction bed, the second heat exchanger is disposed inside the second reaction bed, and the third heat exchanger is disposed inside the third reaction bed;

[0008] The tube side of the third heat exchanger, the tube side of the second heat exchanger, and the tube side of the first heat exchanger are connected in sequence so that the raw gas can flow from the tube side inlet of the third heat exchanger to the tube side outlet of the first heat exchanger and be heated step by step during the flow.

[0009] The outer casing is provided with a first air inlet, a second air inlet, a third air inlet, and a fourth air inlet; the first air inlet is connected to the tube-side inlet of the third heat exchanger; the second air inlet is connected to the tube-side inlet of the second heat exchanger; the third air inlet is connected to the tube-side inlet of the first heat exchanger; and the fourth air inlet is connected to the tube-side outlet of the first heat exchanger.

[0010] The tube-side outlet of the first heat exchanger is connected to the inlet of the first reaction bed.

[0011] In one or more alternative embodiments, the green ammonia synthesis reactor further includes a central tube;

[0012] The central tube passes through the third heat exchanger and is connected to the shell-side outlet of the third heat exchanger;

[0013] The bottom of the outer shell is provided with a first air inlet pipe, which is sleeved on the central tube. A first annular channel is formed between the inner wall of the first air inlet pipe and the outer wall of the central tube. The first annular channel is connected to the tube-side inlet of the third heat exchanger.

[0014] The first air inlet is located on the side wall of the first air inlet pipe.

[0015] In one or more alternative embodiments, the green ammonia synthesis reactor further includes an internal shell;

[0016] The inner shell is disposed between the outer shell and the first reaction bed, the second reaction bed and the at least one third reaction bed, and an accommodating space is formed between the inner shell and the outer shell;

[0017] The second air inlet is located at the bottom of the housing and connects to the accommodating space.

[0018] In one or more alternative embodiments, the green ammonia synthesis reactor further includes a first delivery pipe;

[0019] The first delivery pipe passes through the first heat exchanger and the second heat exchanger, and is connected to the accommodating space and the pipe-side inlet of the second heat exchanger, respectively.

[0020] In one or more alternative embodiments, the green ammonia synthesis reactor further includes a second delivery pipe;

[0021] The second conveying pipe passes through the first heat exchanger and is sleeved on the first conveying pipe;

[0022] A second annular gap channel is formed between the inner wall of the second conveying pipe and the outer wall of the first conveying pipe;

[0023] The second annular channel is connected to the tube-side inlet of the first heat exchanger.

[0024] In one or more alternative embodiments, the housing is provided with a second air intake pipe that communicates with the second annular gap channel, and the third air intake port is provided at the end of the second air intake pipe.

[0025] In one or more alternative embodiments, the housing is provided with a third air intake pipe, and the fourth air intake port is provided at the end of the third air intake pipe.

[0026] In one or more alternative embodiments, a through hole is provided at the top of the inner shell, and the through hole is correspondingly provided at the tube-side outlet of the first heat exchanger;

[0027] The third air intake pipe extends into the through hole.

[0028] In one or more alternative embodiments, the first air inlet is provided with a first regulating valve;

[0029] The second air inlet is equipped with a second regulating valve;

[0030] The third air inlet is equipped with a third regulating valve;

[0031] The fourth air inlet is equipped with a fourth regulating valve.

[0032] In one or more alternative embodiments, the green ammonia synthesis reactor further includes an output gas outlet;

[0033] The gas outlet is located at the bottom of the outer casing and is connected to the central tube.

[0034] In one or more alternative embodiments, the green ammonia synthesis reactor further includes a protective gas inlet and a protective gas outlet;

[0035] The protective gas inlet is located at the top of the outer casing;

[0036] The protective gas outlet is located on the side wall of the housing.

[0037] In a second aspect, embodiments of the present invention provide an ammonia synthesis reaction method, using the green ammonia synthesis reactor described in the first aspect, comprising:

[0038] The raw material gas is introduced into the first inlet, and / or, the raw material gas is introduced into the second inlet, and / or, the raw material gas is introduced into the third inlet, and / or, the raw material gas is introduced into the fourth inlet, so that the temperature of the raw material gas in the first reaction bed reaches a preset threshold.

[0039] The raw material gas enters the first reaction bed, the second reaction bed and the third reaction bed in sequence and reacts to produce gas.

[0040] Thirdly, embodiments of the present invention provide an application of the green ammonia synthesis reactor described in the first aspect in ammonia synthesis reaction production.

[0041] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of the present invention include at least the following:

[0042] This invention provides a green ammonia synthesis reactor. The raw material gas entering through the first, second, and third inlets can be preheated to different degrees before the reaction, thereby maintaining a stable temperature within the reactor when the operating load is lower than the conventional level. This, in turn, maintains relatively stable pressure, ensuring that the ammonia synthesis reaction can proceed stably even at low loads. Furthermore, the heat generated by the ammonia synthesis reaction is used to heat the raw material gas, realizing the recovery and utilization of waste heat resources, reducing the cooling capacity required for subsequent refrigeration, and saving energy consumption. Since the fourth inlet is connected to the tube-side outlet of the first heat exchanger, the raw material gas entering through the fourth inlet remains at a constant temperature before the reaction, providing a lower-temperature raw material gas to the green ammonia synthesis reactor. This ensures that the raw material gas entering through the four inlets has different temperatures before the reaction, allowing the temperature of the raw material gas before the reaction to be adjusted by controlling the proportion of the raw material gas entering through the four inlets. This enables the green ammonia synthesis reactor to perform rapid and flexible load adjustment over a wider range.

[0043] This invention provides a green ammonia synthesis reactor, which can introduce raw material gas into the tube side of the first heat exchanger, the tube side of the second heat exchanger, and the tube side of the third heat exchanger respectively. Since the first heat exchanger, the second heat exchanger, and the third heat exchanger are respectively located inside the first reaction bed, the second reaction bed, and the third reaction bed, the temperature of the first reaction bed, the second reaction bed, and the third reaction bed can be controlled in real time, ensuring the stable progress of the ammonia synthesis reaction.

[0044] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0045] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0046] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0047] Figure 1 This is a schematic diagram of the structure of the green ammonia synthesis reactor provided in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the outer casing provided in an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of the first reaction bed provided in an embodiment of the present invention;

[0050] Figure 4 This is a schematic diagram of the structure of the second reaction bed provided in an embodiment of the present invention;

[0051] Figure 5 This is a schematic diagram of the structure of the third reaction bed provided in an embodiment of the present invention.

[0052] In the picture:

[0053] 1 is the first reaction bed, 2 is the second reaction bed, 3 is the third reaction bed, 4 is the first heat exchanger, 5 is the second heat exchanger, 6 is the third heat exchanger, 7 is the outer shell, 71 is the first air inlet, 72 is the second air inlet, 73 is the third air inlet, 74 is the fourth air inlet, 75 is the output gas outlet, 76 is the first air inlet pipe, 77 is the second air inlet pipe, 78 is the third air inlet pipe, 8 is the inner shell, 81 is the through hole, 9 is the accommodating space, 10 is the central pipe, 11 is the first annular channel, 12 is the first conveying pipe, 13 is the second conveying pipe, 14 is the second annular channel, 15 is the protective gas inlet, and 16 is the protective gas outlet. Detailed Implementation

[0054] 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.

[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] The inventors discovered that due to the instability of renewable energy sources, the yield of hydrogen, the raw material for green ammonia synthesis technology, is unstable. Existing ammonia synthesis reactors can only operate at a maximum load of 50%-100%, making them unsuitable for ammonia synthesis production with unstable hydrogen yields. Furthermore, the internal structure of existing ammonia synthesis reactors is intricate and complex; adding heating equipment would complicate installation and hinder catalyst loading and unloading. Therefore, an ammonia synthesis reactor capable of flexible adjustment across a wide load range is needed.

[0058] Based on this, embodiments of the present invention provide a green ammonia synthesis reactor, method, and application, which will be described in detail below through specific embodiments.

[0059] Example 1

[0060] This invention provides a green ammonia synthesis reactor, as shown in the following embodiments. Figures 1-5 As shown, it includes a first reaction bed 1, a second reaction bed 2, at least one third reaction bed 3, a first heat exchanger 4, a second heat exchanger 5, at least one third heat exchanger 6, and a shell 7;

[0061] The first reaction bed 1, the second reaction bed 2 and at least one third reaction bed 3 are arranged sequentially from top to bottom inside the outer casing 7;

[0062] The first heat exchanger 4 is located inside the first reaction bed 1, the second heat exchanger 5 is located inside the second reaction bed 2, and the third heat exchanger 6 is located inside the third reaction bed 3.

[0063] The tube side of the third heat exchanger 6, the tube side of the second heat exchanger 5, and the tube side of the first heat exchanger 4 are connected in sequence so that the raw material gas can flow from the tube side inlet of the third heat exchanger 6 to the tube side outlet of the first heat exchanger 4 and be heated step by step during the flow.

[0064] The outer casing 7 is provided with a first air inlet 71, a second air inlet 72, a third air inlet 73 and a fourth air inlet 74; the first air inlet 71 is connected to the tube-side inlet of the third heat exchanger 6; the second air inlet 72 is connected to the tube-side inlet of the second heat exchanger 5; the third air inlet 73 is connected to the tube-side inlet of the first heat exchanger 4; and the fourth air inlet 74 is connected to the tube-side outlet of the first heat exchanger 4.

[0065] The tube-side outlet of the first heat exchanger 4 is connected to the inlet of the first reaction bed 1.

[0066] In this embodiment of the invention, reference is made to Figure 1 As shown, the tube-side inlet of the first heat exchanger 4 is located at the bottom of the first heat exchanger 4, and the tube-side outlet of the first heat exchanger 4 is located at the top of the first heat exchanger 4. Gas flows from bottom to top in the tube side of the first heat exchanger 4. The shell-side outlet of the first heat exchanger 4 is located at the bottom of the first heat exchanger 4, and gas flows from top to bottom in the shell side of the first heat exchanger 4. The tube-side inlet of the second heat exchanger 5 is located at the bottom of the second heat exchanger 5, and the tube-side outlet of the second heat exchanger 5 is located at the top of the second heat exchanger 5. Gas flows from bottom to top in the tube side of the second heat exchanger 5. The shell-side outlet of the second heat exchanger 5 is located at the bottom of the second heat exchanger 5, and gas flows from top to bottom in the shell side of the second heat exchanger 5. The tube-side inlet of the third heat exchanger 6 is located at the bottom of the third heat exchanger 6, and the tube-side outlet of the third heat exchanger 6 is located at the top of the third heat exchanger 6. Gas flows from bottom to top in the tube side of the third heat exchanger 6. The shell-side outlet of the third heat exchanger 6 is located at the top of the third heat exchanger 6. Gas flows from bottom to top in the shell side of the third heat exchanger 6.

[0067] In one specific embodiment, reference is made to Figure 1 As shown, the green ammonia synthesis reactor also includes an inner shell 8, which is disposed between the outer shell 7 and the first reaction bed 1, the second reaction bed 2, and the third reaction bed 3. The inlet of the first reaction bed 1 is located between the outer wall of the first reaction bed 1 and the inner wall of the inner shell 8; the inlet of the second reaction bed 2 is located between the outer wall of the second reaction bed 2 and the inner wall of the inner shell 8; and the inlet of the third reaction bed 3 is located between the outer wall of the third reaction bed 3 and the inner wall of the inner shell 8. The outlet of the first reaction bed 1 is located on the shell side of the first heat exchanger 4; the outlet of the second reaction bed 2 is located on the shell side of the second heat exchanger 5; and the outlet of the third reaction bed 3 is located on the shell side of the third heat exchanger 6. The shell-side outlet of the first heat exchanger 4 is connected to the inlet of the second reaction bed 2, and the shell-side outlet of the second heat exchanger 5 is connected to the inlet of the third reaction bed 3.

[0068] In one specific embodiment, reference is made to Figure 1 , Figure 2 and Figure 5 As shown, the green ammonia synthesis reactor also includes a central pipe 10 and a product gas outlet 75. The product gas outlet 75 is located at the bottom of the shell 7. The central pipe 10 passes through the third heat exchanger 6. The central pipe 10 is connected to the shell-side outlet of the third heat exchanger 6 and the product gas outlet 75, so that the gas flowing out from the shell side of the third heat exchanger 6 can be discharged from the product gas outlet 75 after converging in the central pipe 10, thus obtaining product gas.

[0069] In one specific embodiment, reference is made to Figure 1 , Figure 2 and Figure 5 As shown, a first air inlet pipe 76 is provided at the bottom of the outer casing 7. This first air inlet pipe 76 is sleeved on the central pipe 10, so that a first annular channel 11 is formed between the inner wall of the first air inlet pipe 76 and the outer wall of the central pipe 10. The first annular channel 11 connects to the tube-side inlet of the third heat exchanger 6, and a first air inlet 71 is provided on the side wall of the first air inlet pipe 76, so that the first air inlet 71 connects to the tube-side inlet of the third heat exchanger 6, thereby allowing the raw material gas entering through the first air inlet 71 to flow through the first annular channel 11 to the tube-side inlet of the third heat exchanger 6. The raw material gas entering through the first air inlet 71 will flow sequentially through the tube side of the third heat exchanger 6, the tube side of the second heat exchanger 5, and the tube side of the first heat exchanger 4, and be heated step by step during the flow.

[0070] In one specific embodiment, reference is made to Figures 1-4 As shown, an accommodating space 9 is formed between the inner shell 8 and the outer shell, and a second air inlet 72 is located at the bottom of the outer shell 7 and communicates with the accommodating space 9. The raw material gas entering through the second air inlet 72 can flow within the accommodating space 9. The green ammonia synthesis reactor also includes a first conveying pipe 12 passing through the first heat exchanger 4 and the second heat exchanger 5. The first conveying pipe 12 is connected to the accommodating space 9 and the tube-side inlet of the second heat exchanger 5, respectively, so that the second air inlet 72 is connected to the tube-side inlet of the third heat exchanger 6, thereby allowing the raw material gas entering through the second air inlet 72 to flow through the first conveying pipe 12 to the tube-side inlet of the third heat exchanger 6. The raw material gas entering through the second air inlet 72 will flow sequentially through the tube side of the second heat exchanger 5 and the tube side of the first heat exchanger 4, and be heated step by step during the flow.

[0071] In one specific embodiment, reference is made to Figure 1 and Figure 3 As shown, the green ammonia synthesis reactor also includes a second conveying pipe 13, which passes through the first heat exchanger 4 and is sleeved on the first conveying pipe 12. A second annular channel 14 is formed between the inner wall of the second conveying pipe 13 and the outer wall of the first conveying pipe 12, and this second annular channel 14 connects to the tube-side inlet of the first heat exchanger 4. A second air inlet pipe 77, connecting to the second annular channel 14, is provided at the top of the outer shell 7, and a third air inlet 73 is located at the end of the second air inlet pipe 77, thereby connecting the third air inlet 73 to the tube-side inlet of the first heat exchanger 4. This allows the raw material gas entering through the third air inlet 73 to flow through the second annular channel 14 to the tube-side inlet of the first heat exchanger 4. The raw material gas entering through the third air inlet 73 flows through the tube side of the first heat exchanger 4 and is heated during the flow.

[0072] In one specific embodiment, reference is made to Figure 1 and Figure 2As shown, a third air inlet pipe 78 is provided on the top of the outer shell 7, and a fourth air inlet 74 is provided at the end of the third air inlet pipe 78. A through hole 81 is provided on the top of the inner shell 8. The through hole 81 is correspondingly provided at the tube-side outlet of the first heat exchanger 4. The third air inlet pipe 78 extends into the through hole 81, thereby connecting the fourth air inlet 74 to the tube-side outlet of the first heat exchanger 4, so that the raw material gas entering through the fourth air inlet 74 can directly reach the tube-side outlet of the first heat exchanger 4. The raw material gas entering through the fourth air inlet 74 reaches the first reaction bed 1 directly without heating.

[0073] In this embodiment of the invention, the tube-side outlet of the first heat exchanger 4 is connected to the inlet of the first reaction bed 1. The raw material gas flowing out from the tube-side outlet of the first heat exchanger 4 can enter the first reaction bed 1 to start the reaction. The reaction process after entering the first reaction bed 1 can include: the raw material gas reacts in the first reaction bed 1, and the resulting reaction gas flows out of the first reaction bed 1 and enters the shell side of the first heat exchanger 4. Then it enters the second reaction bed 2 and reacts before reaching the shell side of the second heat exchanger 5. Then it enters the third reaction bed 3 and reacts before reaching the shell side of the third heat exchanger 6. Finally, after converging in the central tube 10, it is discharged from the product gas outlet 75 to obtain the product gas.

[0074] In this embodiment of the invention, by heating the raw material gas entering through the first air inlet 71, the second air inlet 72, and the third air inlet 73 to different degrees, the green ammonia synthesis reactor can maintain a stable internal temperature when the operating load is lower than the conventional level, thereby maintaining a relatively stable internal pressure and ensuring that the ammonia synthesis reaction can proceed stably even at low loads. In addition, the heat generated by the ammonia synthesis reaction is used to heat the raw material gas, realizing the recovery and utilization of waste heat resources, reducing the cooling capacity required for subsequent refrigeration, and saving energy consumption.

[0075] In one specific embodiment, a first regulating valve (not shown in the figure) is provided at the first air inlet 71 to control the flow rate and volume of the raw material gas entering through the first air inlet 71; a second regulating valve (not shown in the figure) is provided at the second air inlet 72 to control the flow rate and volume of the raw material gas entering through the second air inlet 72; a third regulating valve (not shown in the figure) is provided at the third air inlet 73 to control the flow rate and volume of the raw material gas entering through the third air inlet; and a fourth regulating valve (not shown in the figure) is provided at the fourth air inlet 74 to control the flow rate and volume of the raw material gas entering through the fourth air inlet 74. Since the raw materials entering through the first inlet 71, the second inlet 72, and the third inlet 73 are heated to different degrees, while the raw materials entering through the fourth inlet 74 are not heated, the raw materials entering through the first inlet 71, the second inlet 72, the third inlet 73, and the fourth inlet 74 have different temperatures before reaching the first reaction bed 1. Therefore, the temperature inside the green ammonia synthesis reactor can be adjusted by controlling the proportion of raw materials entering through the four inlets, enabling the green ammonia synthesis reactor to be rapidly and flexibly adjusted over a wider range.

[0076] In this embodiment of the invention, taking a green ammonia synthesis reactor with a production capacity of 1 million tons / year as an example, the inventors obtained through actual operation that: when the operating load is 100%, the hourly output of the green ammonia synthesis tower is 125 t / h; when the operating load is 10%, the hourly output of the green ammonia synthesis tower is 12.5 t / h; thus, it can be seen that ammonia synthesis production can be carried out within the range of 10%-100%, and the ammonia synthesis reaction proceeds normally and stably.

[0077] The present invention provides a green ammonia synthesis reactor that can maintain stable internal temperature and achieve rapid and flexible load adjustment within the range of 10%-100%. It is suitable for hydrogen feedstock provided by renewable energy hydrogen production, significantly reduces the demand for hydrogen and energy storage, increases the number of operating hours of the device, and has better economic benefits.

[0078] In this embodiment of the invention, the first air inlet 71, the second air inlet 72, the third air inlet 73, and the fourth air inlet 74 can be used individually or in combination, thereby achieving rapid and flexible temperature control. For example, when cooling is required in the green ammonia synthesis reactor, the fourth air inlet 74 can be opened alone to introduce raw material gas at a lower temperature; or, for example, when the required temperature in the green ammonia synthesis reactor is between the temperature achievable by the raw material gas introduced through the first air inlet 71 and the temperature achievable by the raw material gas introduced through the second air inlet 72, the first air inlet 71 and the second air inlet 72 can be opened simultaneously, allowing the two raw material gases to mix in the second heat exchanger 5 before entering the first reaction bed 1, thereby quickly reaching the target temperature, maintaining temperature stability as much as possible, and reducing pressure fluctuations.

[0079] In this embodiment of the invention, since the first air inlet 71 is connected to the tube-side inlet of the third heat exchanger 6, and the third heat exchanger 6 is located inside the third reaction bed 3, the temperature of the third reaction bed 3 can be quickly adjusted, pressure fluctuations can be reduced, and reaction stability can be maintained by controlling the flow rate and volume of the raw material gas entering through the first air inlet 71.

[0080] In this embodiment of the invention, since the second air inlet 72 is connected to the tube-side inlet of the second heat exchanger 5, and the second heat exchanger 5 is located inside the second reaction bed 2, the temperature of the second reaction bed 2 can be quickly adjusted, pressure fluctuations can be reduced, and reaction stability can be maintained by controlling the flow rate and volume of the raw material gas entering through the second air inlet 72.

[0081] In this embodiment of the invention, since the third air inlet 73 is connected to the tube-side inlet of the first heat exchanger 4, and the first heat exchanger 4 is located inside the third reaction bed 3, the temperature of the first reaction bed 1 can be quickly adjusted, pressure fluctuations can be reduced, and reaction stability can be maintained by controlling the flow rate and volume of the raw material gas entering through the third air inlet 73.

[0082] In one specific embodiment, reference is made to Figure 1 and Figure 2 As shown, the green ammonia synthesis reactor also includes a protective gas inlet 15 and a protective gas outlet 16. The protective gas inlet 15 is located at the top of the outer shell 7 and connects to the inlets of the first reaction bed 1, the second reaction bed 2, and the third reaction bed 3, for introducing nitrogen gas. The introduced nitrogen gas prevents oxygen from entering after the green ammonia synthesis reactor is heated and reduced. The protective gas outlet 16 is located on the side wall of the outer shell 7 and connects to the inlets of the first reaction bed 1, the second reaction bed 2, and the third reaction bed 3, for discharging nitrogen gas.

[0083] In one specific embodiment, the first heat exchanger 4, the second heat exchanger 5, and the third heat exchanger 6 are all integral structure heat exchangers. They are already complete structures before being installed into the green ammonia synthesis reactor, and can be directly installed without the need for assembly during the installation process. This facilitates installation and improves operational efficiency.

[0084] In one specific embodiment, a first sealing connection surface is provided between the first reaction bed 1 and the second reaction bed 2, and a second sealing connection surface is provided between the second reaction bed 2 and the third reaction bed 3, thereby achieving a sealed connection.

[0085] Example 2

[0086] Based on the same inventive concept, this invention also provides an ammonia synthesis reaction method, using the green ammonia synthesis reactor described in Example 1, comprising:

[0087] S101: The raw material gas is introduced into the first air inlet 71, and / or, the raw material gas is introduced into the second air inlet 72, and / or, the raw material gas is introduced into the third air inlet 73, and / or, the raw material gas is introduced into the fourth air inlet 74, so that the temperature of the raw material gas in the first reaction bed 1 reaches the preset threshold.

[0088] S102: The raw material gas enters the first reaction bed 1, the second reaction bed 2 and the third reaction bed 3 in sequence and reacts to obtain the product gas.

[0089] In this embodiment of the invention, the ammonia synthesis reaction method corresponds to the green ammonia synthesis reactor described in Example 1. Its specific implementation process can refer to the process of using the green ammonia synthesis reactor to realize ammonia synthesis reaction production in Example 1. The repeated parts will not be described again here.

[0090] Example 3

[0091] Based on the same inventive concept, this invention also provides an application of the green ammonia synthesis reactor described in Embodiment 1 in ammonia synthesis reaction production.

[0092] In this embodiment of the invention, the specific implementation process of ammonia synthesis reaction production using the green ammonia synthesis reactor can refer to the process of ammonia synthesis reaction production using the green ammonia synthesis reactor in the above embodiment 1. The repeated parts will not be described again here.

[0093] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. This disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A green ammonia synthesis reactor, characterized in that, It includes a first reaction bed, a second reaction bed, at least one third reaction bed, a first heat exchanger, a second heat exchanger, at least one third heat exchanger, a shell, and a central tube; The first reaction bed, the second reaction bed, and the at least one third reaction bed are arranged sequentially from top to bottom inside the outer shell; The first heat exchanger is disposed inside the first reaction bed, the second heat exchanger is disposed inside the second reaction bed, and the third heat exchanger is disposed inside the third reaction bed; The tube side of the third heat exchanger, the tube side of the second heat exchanger, and the tube side of the first heat exchanger are connected in sequence so that the raw gas can flow from the tube side inlet of the third heat exchanger to the tube side outlet of the first heat exchanger and be heated step by step during the flow. The outer casing is provided with a first air inlet, a second air inlet, a third air inlet, and a fourth air inlet; the first air inlet is connected to the tube-side inlet of the third heat exchanger; the second air inlet is connected to the tube-side inlet of the second heat exchanger; the third air inlet is connected to the tube-side inlet of the first heat exchanger; and the fourth air inlet is connected to the tube-side outlet of the first heat exchanger. The tube-side outlet of the first heat exchanger is connected to the inlet of the first reaction bed; The central tube passes through the third heat exchanger and is connected to the shell-side outlet of the third heat exchanger; The bottom of the outer shell is provided with a first air inlet pipe, which is sleeved on the central tube. A first annular channel is formed between the inner wall of the first air inlet pipe and the outer wall of the central tube. The first annular channel is connected to the tube-side inlet of the third heat exchanger. The first air inlet is located on the side wall of the first air inlet pipe.

2. The green ammonia synthesis reactor according to claim 1, characterized in that, It also includes the internal casing; The inner shell is disposed between the outer shell and the first reaction bed, the second reaction bed and the at least one third reaction bed, and an accommodating space is formed between the inner shell and the outer shell; The second air inlet is located at the bottom of the housing and connects to the accommodating space.

3. The green ammonia synthesis reactor according to claim 2, characterized in that, It also includes the first delivery pipe; The first delivery pipe passes through the first heat exchanger and the second heat exchanger, and is connected to the accommodating space and the pipe-side inlet of the second heat exchanger, respectively.

4. The green ammonia synthesis reactor according to claim 3, characterized in that, It also includes a second delivery pipe; The second conveying pipe passes through the first heat exchanger and is sleeved on the first conveying pipe; A second annular gap channel is formed between the inner wall of the second conveying pipe and the outer wall of the first conveying pipe; The second annular channel is connected to the tube-side inlet of the first heat exchanger.

5. The green ammonia synthesis reactor according to claim 4, characterized in that, The outer casing is provided with a second air intake pipe, which is connected to the second annular gap channel, and the third air intake port is provided at the end of the second air intake pipe.

6. The green ammonia synthesis reactor according to claim 5, characterized in that, The outer casing is provided with a third air inlet pipe, and the fourth air inlet is located at the end of the third air inlet pipe.

7. The green ammonia synthesis reactor according to claim 6, characterized in that, The top of the inner shell is provided with a through hole, and the through hole is correspondingly provided at the tube-side outlet of the first heat exchanger; The third air intake pipe extends into the through hole.

8. The green ammonia synthesis reactor according to claim 1, characterized in that, The first air inlet is equipped with a first regulating valve; The second air inlet is equipped with a second regulating valve; The third air inlet is equipped with a third regulating valve; The fourth air inlet is equipped with a fourth regulating valve.

9. The green ammonia synthesis reactor according to claim 1, characterized in that, This also includes the export of produced gas; The gas outlet is located at the bottom of the outer casing and is connected to the central tube.

10. The green ammonia synthesis reactor according to claim 1, characterized in that, It also includes protective gas inlet and protective gas outlet; The protective gas inlet is located at the top of the outer casing; The protective gas outlet is located on the side wall of the housing.

11. A method for ammonia synthesis, using the green ammonia synthesis reactor according to any one of claims 1-10, characterized in that, include: The raw material gas is introduced into the first inlet, and / or, the raw material gas is introduced into the second inlet, and / or, the raw material gas is introduced into the third inlet, and / or, the raw material gas is introduced into the fourth inlet, so that the temperature of the raw material gas in the first reaction bed reaches a preset threshold. The raw material gas enters the first reaction bed, the second reaction bed and the third reaction bed in sequence and reacts to produce gas.

12. The application of the green ammonia synthesis reactor according to any one of claims 1-10 in ammonia synthesis reaction production.

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