Synthetic ammonia system

Abstract

The utility model discloses an ammonia synthesis system which comprises a green power generation device, a hydrogen production device, a nitrogen production device, an ammonia synthesis device, a hydrogen storage tank and a controller, the green power generation device is used for providing electric energy for the hydrogen production device; the hydrogen production device is used for preparing hydrogen by using the electric energy generated by the green power generation device; the hydrogen production device, the nitrogen production device and the hydrogen storage tank are all communicated with the ammonia synthesis device through gas pipelines; a first hydrogen control valve is arranged on the gas pipeline for communicating the hydrogen production device with the ammonia synthesis device; a second hydrogen control valve is arranged on the gas conveying pipeline for communicating the hydrogen storage tank with the ammonia synthesis device; the controller is used for controlling the hydrogen production device, the nitrogen production device and the ammonia synthesis device to operate and controlling the first hydrogen control valve and the second hydrogen control valve to be opened or closed. The green power generation device is used for providing energy for the hydrogen production device, the hydrogen storage tank is further arranged, the influence of fluctuation of the generating capacity of the green power generation device is reduced, and the operation safety and stability of the ammonia synthesis system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia synthesis, in particular to an ammonia synthesis system. Background Art

[0002] In the ammonia synthesis process, it is necessary to separately prepare nitrogen and hydrogen first, and then mix nitrogen and hydrogen in a ratio of 3:1 for a chemical reaction to achieve the synthesis of ammonia. Compared with nitrogen, which can be obtained by separating nitrogen in the air, the preparation of hydrogen requires more energy. For example, electrolytic hydrogen production by electricity requires a large amount of electric energy. In traditional processes, coal or natural gas combustion is mostly used to generate electricity to provide the energy required for hydrogen production, but coal or natural gas energy supply will result in a large amount of carbon dioxide emissions, which does not conform to the trend of industrial production towards energy conservation and emission reduction.

[0003] Wind energy, solar energy, etc. belong to the clean new energies that have been vigorously developed in recent years. Therefore, using wind energy and solar energy to provide energy for hydrogen production can well solve the environmental problems brought by hydrogen production; however, new energies such as wind energy and solar energy itself have timeliness. Using fluctuating new energy to provide energy for hydrogen production will inevitably lead to fluctuating hydrogen production, and then affect the safety and stability of the operation of the entire ammonia synthesis power system. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an ammonia synthesis system, which reduces the impact on the stable operation of the entire ammonia synthesis system caused by using the energy provided by a green power generation device, and is beneficial to improving the safety and stability of the operation of the entire ammonia synthesis system.

[0005] To solve the above technical problems, the utility model provides an ammonia synthesis system, which includes a green power generation device, a hydrogen production device, a nitrogen production device, an ammonia synthesis device, a hydrogen storage tank and a controller;

[0006] Among them, the green power generation device includes at least one of a wind power generation unit or a photovoltaic power generation unit; the green power generation device is used to provide electric energy for the hydrogen production device;

[0007] The hydrogen production device is used to produce hydrogen by using the electric energy generated by the green power generation device;

[0008] The output end of the hydrogen production device, the output end of the nitrogen production device and the output end of the hydrogen storage tank are all connected to the input end of the ammonia synthesis device through gas pipelines; a first hydrogen control valve is arranged on the gas pipeline connecting the hydrogen production device and the ammonia synthesis device; a second hydrogen control valve is arranged on the gas pipeline connecting the hydrogen storage tank and the ammonia synthesis device;

[0009] The controller is connected to the hydrogen production device, the nitrogen production device, and the ammonia synthesis device, and is used to control the startup and operation of the hydrogen production device, the nitrogen production device, and the ammonia synthesis device, and to adjust the magnitude of the operating power;

[0010] The controller is respectively connected to the first hydrogen control valve and the second hydrogen control valve, and is used to respectively control the opening or closing of the first hydrogen control valve and the second hydrogen control valve.

[0011] In an optional embodiment of the present application, the gas transmission pipeline includes a hydrogen storage transmission pipeline connecting the output end of the hydrogen production device and the input end of the hydrogen storage tank; wherein, a third hydrogen control valve is provided on the hydrogen storage transmission pipeline;

[0012] The controller is connected to the third hydrogen control valve and is used to control the opening or closing of the third hydrogen control valve.

[0013] In an optional embodiment of the present application, it further includes a hydrogen compressor connected to the input end and the output end of the hydrogen storage tank, and the output end is connected to the ammonia synthesis device;

[0014] A hydrogen pressure gauge is provided on the hydrogen storage tank.

[0015] In an optional embodiment of the present application, the gas transmission pipeline includes a first hydrogen transmission pipeline, a second hydrogen transmission pipeline, a third hydrogen transmission pipeline, a fourth hydrogen transmission pipeline, and a main hydrogen transmission pipeline;

[0016] Wherein, the first end of the first hydrogen transmission pipeline is connected to the output end of the hydrogen production device, and the second end of the first hydrogen transmission pipeline is connected to the first end of the main hydrogen transmission pipeline; the first hydrogen control valve is provided on the first hydrogen transmission pipeline;

[0017] The first end of the second hydrogen transmission pipeline is connected to the output end of the hydrogen storage tank, and the second end of the second hydrogen transmission pipeline is connected to the first end of the fourth hydrogen transmission pipeline;

[0018] The first end of the third hydrogen transmission pipeline is connected to the output end of the hydrogen storage tank, and the second end of the third hydrogen transmission pipeline is connected to the input end of the hydrogen compressor;

[0019] The first end of the fourth hydrogen transmission pipeline is connected to the output end of the hydrogen compressor, and the second end of the fourth hydrogen transmission pipeline is connected to the first end of the main hydrogen transmission pipeline; the second hydrogen control valve is provided on the fourth hydrogen transmission pipeline;

[0020] The second end of the main hydrogen transmission pipeline is connected to the input end of the ammonia synthesis device;

[0021] A first hydrogen flowmeter and a second hydrogen flowmeter are respectively arranged on the first hydrogen pipeline and the main hydrogen pipeline.

[0022] In an optional embodiment of the present application, it further includes a nitrogen compressor and a nitrogen storage tank; the nitrogen production device includes an air separation nitrogen production device;

[0023] The gas pipeline includes a first nitrogen pipeline, a second nitrogen pipeline, a third nitrogen pipeline and a main nitrogen pipeline;

[0024] The output end of the air separation nitrogen production device is connected to the input end of the nitrogen compressor through the first nitrogen pipeline; the input end of the nitrogen storage tank is connected to the output end of the nitrogen compressor through the second nitrogen pipeline; the output end of the nitrogen storage tank is connected to the input end of the nitrogen compressor through the third nitrogen pipeline;

[0025] The output end of the nitrogen compressor is connected through the main nitrogen pipeline;

[0026] A first nitrogen control valve, a second nitrogen control valve and a third nitrogen control valve are respectively arranged on the main nitrogen pipeline, the second nitrogen pipeline and the third nitrogen pipeline;

[0027] The controller is respectively connected to the first nitrogen control valve, the second nitrogen control valve and the third nitrogen control valve, and is used to control the opening and closing of the first nitrogen control valve, the second nitrogen control valve and the third nitrogen control valve;

[0028] A nitrogen flowmeter is arranged on the main nitrogen pipeline.

[0029] In an optional embodiment of the present application, a nitrogen pressure gauge is further arranged in the nitrogen storage tank.

[0030] In an optional embodiment of the present application, the nitrogen storage tank is further connected with a cooling device, which is used to cool and liquefy the nitrogen stored in the nitrogen storage tank.

[0031] In an optional embodiment of the present application, it further includes a power storage device with an input end electrically connected to the green power generation device and an output end electrically connected to the hydrogen production device.

[0032] In an optional embodiment of the present application, it further includes a synthesis compressor connected to the input end of the ammonia synthesis device, which is used to compress the mixed gas of hydrogen and nitrogen and then transport it to the ammonia synthesis device.

[0033] In an alternative embodiment of the present application, a bypass pipeline is further connected between the input end of the synthesis compressor and the output end of the ammonia synthesis unit; a bypass control valve connected to the controller is provided on the bypass pipeline; the controller is used to control the opening degree of the bypass control valve.

[0034] An ammonia synthesis system provided by the present utility model includes a green power generation device, a hydrogen production device, a nitrogen production device, an ammonia synthesis unit, a hydrogen storage tank, and a controller; wherein, the green power generation device includes at least one of a wind power generation unit or a photovoltaic power generation unit; the green power generation device is used to provide electric energy for the hydrogen production device; the hydrogen production device is used to produce hydrogen by using the electric energy generated by the green power generation device; the output ends of the hydrogen production device, the nitrogen production device, and the hydrogen storage tank are all connected to the input end of the ammonia synthesis unit through gas transmission pipelines; a first hydrogen control valve is provided on the gas transmission pipeline connecting the hydrogen production device and the ammonia synthesis unit; a second hydrogen control valve is provided on the gas transmission pipeline connecting the hydrogen storage tank and the ammonia synthesis unit; the controller is connected to the hydrogen production device, the nitrogen production device, and the ammonia synthesis unit, and is used to control the start-up and operation of the hydrogen production device, the nitrogen production device, and the ammonia synthesis unit, and to adjust the magnitude of the operating power; the controller is respectively connected to the first hydrogen control valve and the second hydrogen control valve, and is used to respectively control the opening or closing of the first hydrogen control valve and the second hydrogen control valve.

[0035] Based on the fact that the ammonia synthesis system in the present application uses the green power generation device to provide the energy required for hydrogen production in the hydrogen production device, a hydrogen storage tank is further equipped. Thus, in practical applications, when the power generation of the green power generation fluctuates, causing the hydrogen production amount of the hydrogen production device to drop below the hydrogen amount required by the current load power of the ammonia synthesis unit, the hydrogen storage tank can be used to provide a certain amount of hydrogen for the ammonia synthesis unit, thereby reducing the impact on the stable operation of the entire ammonia synthesis system caused by using the energy provided by the green power generation device to produce hydrogen, which is beneficial to improving the safety and stability of the operation of the entire ammonia synthesis system.

[0036] In another alternative embodiment of the present application, a nitrogen storage tank is further configured, and the output end of the nitrogen storage tank is connected to the input end of the air separation nitrogen production unit through two nitrogen transmission pipelines, and the input end of the nitrogen storage tank is connected to the output end of the nitrogen compressor. Furthermore, a nitrogen circuit is formed between the nitrogen storage tank and the nitrogen compressor. Thus, by using only the same nitrogen compressor, the nitrogen input into the nitrogen storage tank can be compressed, and the nitrogen output from the nitrogen storage tank can also be compressed. On the basis of ensuring the effective control of the nitrogen pressure delivered to the ammonia synthesis unit, the nitrogen transmission structure is simplified. Description of the Drawings

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a schematic structural diagram of the ammonia synthesis system provided by the embodiment of the present application. Detailed implementation manners

[0039] In order to enable those skilled in the art to better understand the solution of the present invention, the following will further describe the present invention in detail in conjunction with the drawings and specific implementation manners. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0040] As Figure 1 shown, Figure 1 It is a schematic structural diagram of the ammonia synthesis system provided by the embodiment of the present application.

[0041] In a specific embodiment of the present application, the ammonia synthesis system may include:

[0042] A green power generation device 1, a hydrogen production device 2, a nitrogen production device 3, an ammonia synthesis device 4, a hydrogen storage tank 21, and a controller;

[0043] Among them, the green power generation device 1 includes at least one of a wind power generation unit or a photovoltaic power generation unit; the green power generation device 1 is used to provide electric energy for the hydrogen production device 2;

[0044] The hydrogen production device 2 is used to produce hydrogen by using the electric energy generated by the green power generation device 1;

[0045] The output end of the hydrogen production device 2, the output end of the nitrogen production device 3, and the output end of the hydrogen storage tank 21 are all connected to the input end of the ammonia synthesis device 4 through gas pipelines; a first hydrogen control valve 211 is provided on the gas pipeline connecting the hydrogen production device 2 and the ammonia synthesis device 4; a second hydrogen control valve 212 is provided on the gas pipeline connecting the hydrogen storage tank 21 and the ammonia synthesis device 4;

[0046] The controller is connected to the hydrogen production device 2, the nitrogen production device 3, and the ammonia synthesis device 4, and is used to control the start and operation of the hydrogen production device 2, the nitrogen production device 3, and the ammonia synthesis device 4, and adjust the magnitude of the operating power;

[0047] The controller is respectively connected to the first hydrogen control valve 211 and the second hydrogen control valve 212, and is used to control the opening or closing of the first hydrogen control valve 211 and the second hydrogen control valve 212 respectively.

[0048] Referring to Figure 1 , the ammonia synthesis system of this embodiment includes a green power generation device 1 that can generate electricity using new energy sources such as wind energy and solar energy, a hydrogen production device 2 for preparing hydrogen, a nitrogen production device 3 for preparing nitrogen, and an ammonia synthesis device 4 for synthesizing ammonia using hydrogen and nitrogen. The hydrogen production device 2 and the nitrogen production device 3 are both gas-connected to the ammonia synthesis device 4 through a conveying pipeline. Thus, the hydrogen and nitrogen respectively prepared by the hydrogen production device 2 and the nitrogen production device 3 can be transmitted to the ammonia synthesis device 4 through the gas transmission pipeline; in Figure 1 The direction shown by the arrow in is also the air flow direction in the conveying pipeline.

[0049] On this basis, the ammonia synthesis system is also equipped with a hydrogen storage tank 21 and a controller; among them, the green power generation device 1, the hydrogen production device 2, the nitrogen production device 3, and the ammonia synthesis device 4 are all communicatively connected to the controller, and the start-up operation, stop operation, operating power, etc. of each device are all controlled and adjusted by the controller; in addition, the hydrogen storage tank 21 is also gas-connected to the ammonia synthesis device 4 through a gas transmission pipeline, and a first hydrogen control valve 211 is provided on the gas transmission pipeline connecting the hydrogen production device 2 and the ammonia synthesis device 4, and a second hydrogen control valve 212 is provided on the gas transmission pipeline connecting the hydrogen storage tank 21 and the ammonia synthesis device 4, and the opening and closing of the first hydrogen control valve 211 and the second hydrogen control valve 212 are both controlled by the controller.

[0050] Thus, in practical applications, the green power generation device 1 can generate electricity using new energy sources such as wind energy and solar energy in the environment, and the generated electric energy can supply energy for hydrogen production of the hydrogen production device 2. The hydrogen production device 2 in this embodiment can specifically be an electrolytic water hydrogen production device 2, and the number of the electrolytic water hydrogen production devices 2 can be more than 40; and the start-up and shutdown of each electrolytic water hydrogen production device 2 are independently controlled by the controller; when the power generation of the green power generation device 1 is relatively large, the controller can control a larger number of hydrogen production devices 2 to start running; in addition, in some cases, it is also possible that the wind energy and solar energy in the environment are very sufficient, so that the green power generation device 1 can provide enough power for all the hydrogen production devices 2 to start simultaneously, and there is still surplus power. Therefore, the green power generation device 1 can also be electrically connected to a power storage device, and the power storage device is also electrically connected to the hydrogen production device 2; thus, when the electric energy generated by the green power generation device 1 is sufficient, and there is still surplus power when supplying all the hydrogen production devices 2 to start running simultaneously, the surplus power can be stored in the power storage device.

[0051] When the power generation of the green power generation device 1 is relatively small, the controller can control only a small number of hydrogen production devices 2 to start running, while other hydrogen production devices 2 are in a hot standby state and do not work. In addition, the electric energy stored in the above-mentioned energy storage device can also provide energy for hydrogen production by the hydrogen production device 2 when the power generation of the green power generation device 1 is relatively low. The hydrogen produced by the hydrogen production device 2 using the electric energy generated by the green power generation device 1, the controller can control the first hydrogen control valve 211 on the gas transmission pipeline between the hydrogen production device 2 and the ammonia synthesis device 4 to open. Thus, the hydrogen prepared by the hydrogen production device 2 can be transported to the ammonia synthesis device 4 together with the nitrogen produced by the nitrogen production device 3 through the transmission pipeline, and ammonia synthesis can be achieved.

[0052] As described above, as the power generation of the green power generation device 1 fluctuates, the number of hydrogen production devices 2 starting to run also changes, and obviously the hydrogen production amount of the hydrogen production device 2 will also change accordingly; there may be a mismatch between the current load power of the ammonia synthesis device 4 and the current hydrogen production amount of the hydrogen production device 2. Therefore, in order to minimize the adjustment of the operating parameters of the synthesis device, when the current hydrogen production amount of the hydrogen production device 2 is less than the hydrogen amount required for ammonia synthesis by the ammonia synthesis device 4, the second hydrogen control valve 212 on the gas transmission pipeline connecting the hydrogen storage tank 21 and the ammonia synthesis device 4 can be further controlled to open, and the opening degree should be proportional to the difference between the hydrogen amount required by the ammonia synthesis device 4 and the hydrogen production amount of the hydrogen production device 2.

[0053] Further considering that the hydrogen production amount of the hydrogen production device 2 may also be greater than the hydrogen amount required by the ammonia synthesis device 4; for this reason, referring to Figure 1 , in another optional embodiment of the present application, the gas transmission pipeline includes a hydrogen storage transmission pipeline connecting the output end of the hydrogen production device 2 and the input end of the hydrogen storage tank 21; wherein, a third hydrogen control valve 213 is provided on the hydrogen storage transmission pipeline;

[0054] The controller is connected to the third hydrogen control valve 213 for controlling the opening or closing of the third hydrogen control valve 213.

[0055] On this basis, in this embodiment, a hydrogen storage transmission pipeline is connected between the output end of the hydrogen production device 2 and the input end of the hydrogen storage tank 21, and a third control valve is also provided on the hydrogen transmission pipeline; thus, when the hydrogen production amount of the hydrogen production device 2 is greater than the hydrogen amount required by the ammonia synthesis device 4, the controller can control the second hydrogen control valve 212 to close and the third hydrogen control valve 213 to open at this time, and the opening degree of the third hydrogen control valve 213 is proportional to the difference between the hydrogen production amount of the hydrogen production device 2 and the hydrogen amount required by the ammonia synthesis device 4.

[0056] It can be seen that the hydrogen storage tank 21 in this embodiment can cache the hydrogen produced by the hydrogen production device 2. When the hydrogen production amount of the hydrogen production device 2 is insufficient, it can supply sufficient hydrogen to the ammonia synthesis device 4. When the hydrogen production amount of the hydrogen production device 2 is excessive, it can store the excess hydrogen of the hydrogen production device 2, thereby reducing the large and frequent fluctuations of the ammonia synthesis device 4 following the hydrogen production amount of the hydrogen production device 2 during actual operation, which is beneficial to maintaining the stability and safety of the operation of the entire ammonia synthesis system.

[0057] Furthermore, considering that as the hydrogen in the hydrogen storage tank 21 is consumed, the air pressure in the hydrogen storage tank 21 also decreases accordingly. If the air pressure in the hydrogen storage tank 21 is relatively low, the air pressure of the hydrogen directly discharged from the hydrogen storage tank 21 obviously does not meet the ammonia production requirements of the ammonia synthesis device 4. Therefore, in the ammonia synthesis system, a hydrogen compressor 22 can be further included, which is connected to the input end and the output end of the hydrogen storage tank 21, and the output end is connected to the ammonia synthesis device 4; and a hydrogen pressure gauge is provided on the hydrogen storage tank 21. Thus, the air pressure in the hydrogen storage tank 21 can be monitored through the hydrogen pressure gauge. If the air pressure in the hydrogen storage tank 21 measured by the hydrogen pressure gauge is relatively small, the controller can control the hydrogen compressor 22 to start, so that the hydrogen in the hydrogen storage tank 21 is compressed by the hydrogen compressor 22 and then output. In addition, the air pressure measured by the hydrogen pressure gauge can also characterize the hydrogen storage amount in the hydrogen storage tank 21 to a certain extent. Once the air pressure in the hydrogen storage tank 21 is too high, it means that the hydrogen storage amount in the hydrogen storage tank 21 is too large, and the load power of the ammonia synthesis device 4 can be appropriately increased, thereby increasing the consumption of hydrogen by the ammonia synthesis device 4; when the air pressure in the hydrogen storage tank 21 is too small, it means that the hydrogen storage amount in the hydrogen storage tank 21 is insufficient, and the load power of the ammonia synthesis device 4 can be appropriately reduced, and even the ammonia synthesis device 4 can be controlled to be in a hot standby state of stopping operation, so that the hydrogen generated by the hydrogen production device 2 can be largely filled into the hydrogen storage tank 21 to ensure that there is enough hydrogen stored in the hydrogen storage tank 21.

[0058] Based on the above discussion, referring to Figure 1 , in another optional embodiment of the present application, the gas transmission pipeline may specifically include:

[0059] The first hydrogen transmission pipeline 201, the second hydrogen transmission pipeline 202, the third hydrogen transmission pipeline 203, the fourth gas transmission pipeline, and the main hydrogen transmission pipeline 205;

[0060] Among them, the first end of the first hydrogen transmission pipeline 201 is connected to the output end of the hydrogen production device 2, and the second end of the first hydrogen transmission pipeline 201 is connected to the first end of the main hydrogen transmission pipeline 205; a first hydrogen control valve 211 is provided on the first hydrogen transmission pipeline 201;

[0061] The first end of the second hydrogen pipeline 202 is connected to the output end of the hydrogen storage tank 21, and the second end of the second hydrogen pipeline 202 is connected to the first end of the main hydrogen pipeline 205;

[0062] The first end of the third hydrogen pipeline 203 is connected to the output end of the hydrogen storage tank 21; the second end of the third hydrogen pipeline 203 is connected to the input end of the hydrogen compressor 22;

[0063] The first end of the fourth hydrogen pipeline 204 is connected to the output end of the hydrogen compressor 22, and the second end of the fourth hydrogen pipeline 204 is connected to the first end of the main hydrogen pipeline 205; the second hydrogen control valve 212 is arranged on the fourth hydrogen pipeline 204;

[0064] The second end of the main hydrogen pipeline 205 is connected to the input end of the ammonia synthesis unit 4;

[0065] A first hydrogen flowmeter 221 and a second hydrogen flowmeter 222 are respectively arranged on the first hydrogen pipeline 201 and the main hydrogen pipeline 205.

[0066] The gas pipeline in this application connects two parallel lines for hydrogen to be transported to the ammonia synthesis unit 4; among them, the first line is the line formed by connecting the output end of the hydrogen production device 2 to the main hydrogen pipeline 205 through the first hydrogen pipeline 201, that is, the line for hydrogen to be directly transported from the hydrogen production device 2 to the ammonia synthesis unit 4; the second line is also the line formed by connecting the output end of the hydrogen production device 2 through the hydrogen storage tank 21 and finally connecting to the main hydrogen pipeline 205 through the fourth hydrogen pipeline 204, that is, the line for hydrogen to be transported to the ammonia synthesis unit 4 through the hydrogen storage tank 21.

[0067] In addition, a first hydrogen control valve 211 and a second hydrogen control valve 212 are respectively arranged on the first hydrogen pipeline 201 and the fourth hydrogen pipeline 204; thus, when only the hydrogen production device 2 needs to transport hydrogen to the ammonia synthesis unit 4, the first hydrogen control valve 211 is controlled to open, while the second hydrogen control valve 212 is closed; on the contrary, when only the hydrogen storage tank 21 needs to transport hydrogen to the ammonia synthesis unit 4, the first hydrogen control valve 211 is controlled to close, while the second hydrogen control valve 212 is opened; when the hydrogen production device 2 and the hydrogen storage tank 21 need to transport hydrogen to the ammonia synthesis unit 4 at the same time, the first hydrogen control valve 211 and the second hydrogen control valve 212 can be opened simultaneously.

[0068] In addition, a first hydrogen flowmeter 221 is arranged on the first hydrogen pipeline 201 in this embodiment, referring to Figure 1, the first hydrogen flowmeter 221 should be arranged at a position close to the output end of the hydrogen production pipeline. Whether the hydrogen produced by the hydrogen production device 2 flows directly to the ammonia synthesis device 4 through the first hydrogen transmission pipeline 201 or flows to the hydrogen storage tank 21 through the hydrogen storage and transmission pipeline, the hydrogen produced by the hydrogen production device 2 needs to flow through the first hydrogen flowmeter 221. That is to say, the first hydrogen flowmeter 221 is used to detect the hydrogen production amount of the hydrogen production device 2. Therefore, in practical applications, based on the current hydrogen production amount of the hydrogen production device 2 measured by the first hydrogen flowmeter 221 and combined with the hydrogen amount required by the ammonia synthesis device 4, it is possible to determine whether the first hydrogen control valve 211, the second hydrogen control valve 212, and the third hydrogen control valve 213 should be closed or opened respectively.

[0069] On this basis, in the second hydrogen transmission line described above, the second hydrogen transmission pipeline 202 and the hydrogen compressor 22 are connected in parallel between the output end of the hydrogen storage tank 21 and the first end of the main hydrogen transmission pipeline 205. That is, there are also two hydrogen transmission branch lines for the hydrogen output from the hydrogen storage tank 21, so that the hydrogen in the hydrogen storage tank 21 can be directly transmitted to the main hydrogen transmission pipeline 205 through the second hydrogen transmission pipeline 202, or can be pressurized by the hydrogen compressor 22 and then transmitted to the main hydrogen transmission pipeline 205, thereby ensuring that the hydrogen gas flow in the main hydrogen transmission pipeline 205 has sufficient air pressure to drive its flow into the ammonia synthesis device 4.

[0070] In practical applications, a fourth hydrogen control valve 214 and a fifth hydrogen control valve 215 can be respectively arranged on the second hydrogen transmission pipeline 202 and the third hydrogen transmission pipeline 203. Thus, when the air pressure measured by the hydrogen pressure gauge on the hydrogen storage tank 21 is greater than the air pressure threshold value, the controller can control the fourth hydrogen control valve 214 to open and the fifth hydrogen control valve 215 to close. On the contrary, when the air pressure measured by the hydrogen pressure gauge on the hydrogen storage tank 21 is not greater than the air pressure threshold value, the controller can control the fourth hydrogen control valve 214 to close and the fifth hydrogen control valve 215 to open. For this air pressure threshold value, it should be the minimum air pressure that ensures the hydrogen can be automatically driven to flow to the ammonia synthesis device 4. In this regard, it is not specifically described in this embodiment.

[0071] In addition, in this embodiment, a second hydrogen flowmeter 222 is provided on the main hydrogen pipeline 205. This second hydrogen flowmeter 222 is used to detect the total amount of hydrogen delivered by the above two hydrogen delivery lines to the ammonia synthesis unit 4. Based on the hydrogen flow rate measured by this hydrogen flowmeter, it is possible to determine whether the hydrogen flow rate delivered by the above two lines to the ammonia synthesis unit 4 meets the requirements of the ammonia synthesis unit 4. If not, the opening, closing, and opening degree of the first hydrogen control valve 211, the second hydrogen control valve 212, the third hydrogen control valve 213, the fourth hydrogen control valve 214, and the fifth hydrogen control valve 215 can be adjusted to ensure that hydrogen is delivered at the required flow rate of the ammonia synthesis unit 4. The hydrogen flow rate measured by the second hydrogen flowmeter 222 can also be used as a reference for the amount of nitrogen required by the ammonia synthesis unit 4.

[0072] Based on any of the above embodiments, in another optional embodiment of the present application, the ammonia synthesis system may further include:

[0073] A nitrogen compressor 32 and a nitrogen storage tank 31. The nitrogen production device 3 includes an air separation nitrogen production device;

[0074] The gas transmission pipeline includes a first nitrogen pipeline 301, a second nitrogen pipeline 302, a third nitrogen pipeline 303, and a main nitrogen pipeline 300;

[0075] The output end of the air separation nitrogen production device is connected to the input end of the nitrogen compressor 32 through the first nitrogen pipeline 301; the input end of the nitrogen storage tank 31 is connected to the output end of the nitrogen compressor 32 through the second nitrogen pipeline 302; the output end of the nitrogen storage tank 31 is connected to the input end of the nitrogen compressor 32 through the third nitrogen pipeline 303;

[0076] The output end of the nitrogen compressor 32 is connected through the main nitrogen pipeline 300;

[0077] A first nitrogen control valve 311, a second nitrogen control valve 312, and a third nitrogen control valve are respectively provided on the main nitrogen pipeline 300, the second nitrogen pipeline 302, and the third nitrogen pipeline 303;

[0078] The controller is respectively connected to the first nitrogen control valve 311, the second nitrogen control valve 312, and the third nitrogen control valve for controlling the opening and closing of the first nitrogen control valve 311, the second nitrogen control valve 312, and the third nitrogen control valve;

[0079] A nitrogen flowmeter 321 is provided on the main nitrogen pipeline 300.

[0080] The nitrogen production device 3 in this embodiment may specifically adopt an air separation nitrogen production device, that is, using molecular sieves to separately separate nitrogen in the air. On this basis, in this embodiment, it is considered that the load power of ammonia synthesis in the ammonia synthesis device 4 will fluctuate with the hydrogen production amount of the hydrogen production device 2; however, if the fluctuation range of the load power of the ammonia synthesis device 4 is too large, it is often difficult for the nitrogen production load power of the air separation nitrogen production device to change rapidly accordingly; for this reason, in this application, a nitrogen storage tank 31 and a nitrogen compressor 32 are further configured for the nitrogen production device 3; wherein, the nitrogen compressor 32 is directly arranged between the air separation nitrogen production device and the main nitrogen transmission pipeline 300, and the nitrogen output from the air separation nitrogen production device can be compressed by the nitrogen compressor 32 first and then transported to the main nitrogen transmission pipeline 300, providing power for the nitrogen to be transported to the ammonia synthesis device 4 through the main nitrogen transmission pipeline 300.

[0081] The input end of the nitrogen storage tank 31 is connected to the output end of the nitrogen compressor 32 through the second nitrogen transmission pipeline 302; the output end of the nitrogen storage tank 31 is connected to the input end of the nitrogen compressor 32 through the third nitrogen transmission pipeline 303; thus, the nitrogen output from the nitrogen compressor 32 can be input into the nitrogen storage tank 31 through the second nitrogen transmission pipeline 302, and the nitrogen output from the nitrogen storage tank 31 can be transported into the nitrogen compressor 32 again, thus forming a circulation loop between the nitrogen compressor 32 and the hydrogen storage tank 21. Then, in actual application, if the nitrogen production amount of the air separation nitrogen production device is greater than the nitrogen amount required by the ammonia synthesis device 4, the controller can, on the basis of opening the first nitrogen control valve 311 on the main nitrogen transmission pipeline 300, also open the first nitrogen control valve 311 on the second nitrogen transmission pipeline 302 and close the third nitrogen control valve on the third nitrogen transmission pipeline 303. Thus, part of the nitrogen output from the air separation nitrogen production device can be transported to the ammonia synthesis device 4 through the main nitrogen transmission pipeline 300 after being compressed by the nitrogen compressor 32, and the other part is transported to the nitrogen storage tank 31 through the second transmission pipeline; when the nitrogen production amount of the air separation nitrogen production device is less than the nitrogen amount required by the ammonia synthesis device 4, the controller can control the first nitrogen control valve 311 to open, the second nitrogen control valve 312 to close, and the third nitrogen control valve to open. Thus, the hydrogen output from the air separation nitrogen production device can enter the nitrogen compressor 32 together with the hydrogen output from the nitrogen storage tank 31 and be compressed by the nitrogen compressor 32 and then transported to the main nitrogen transmission pipeline 300 together.

[0082] It can be seen that in this embodiment, a circulation loop is formed between the nitrogen compressor 32 and the nitrogen storage tank 31, so that the nitrogen can be compressed by the nitrogen compressor 32 before being filled into the nitrogen storage tank 31, thereby increasing the hydrogen storage capacity of the nitrogen storage tank 31. When the nitrogen storage tank 31 outputs nitrogen, the nitrogen can be mixed with the low-pressure hydrogen of the air separation nitrogen generation device again. On the one hand, it can save the power of the nitrogen compressor 32 to compress the mixed nitrogen, and on the other hand, it can ensure that the nitrogen after passing through the nitrogen compressor 32 has sufficient power to flow to the ammonia synthesis device 4. In this embodiment, by using the circulation loop formed between the nitrogen compressor 32 and the nitrogen storage tank 31, only one set of nitrogen compressors 32 can be used to realize the repeated cyclic compression of nitrogen, which simplifies the overall frame structure on the basis of ensuring the operation reliability of the entire frame structure for providing nitrogen.

[0083] In addition, a nitrogen flow meter 321 is provided on the main nitrogen transmission pipeline 300 in this application. The nitrogen flow measured by the nitrogen flow meter 321 is also the total nitrogen flow delivered by the main nitrogen transmission pipeline 300 to the ammonia synthesis device 4. Based on the magnitude of the flow measured by the nitrogen flow meter 321, it can be determined whether the amount of nitrogen delivered to the ammonia synthesis device 4 meets the requirements.

[0084] In addition, a nitrogen pressure gauge can also be provided in the hydrogen storage tank 21; the nitrogen storage amount in the nitrogen storage tank 31 can be measured through the nitrogen pressure gauge; once the nitrogen in the nitrogen storage tank 31 is insufficient, the load power of the air separation nitrogen generation device can be appropriately increased, and when the nitrogen amount in the nitrogen storage tank 31 is excessive, the load power of the air separation nitrogen generation device can be appropriately reduced.

[0085] Furthermore, in order to increase the nitrogen storage amount in the nitrogen storage tank 31 as much as possible, in another optional embodiment of this application, the nitrogen storage tank 31 can also be connected to a cooling device or arranged inside the cooling device, so as to cool down the nitrogen in the nitrogen storage tank 31, and even liquefy it, thereby enabling the hydrogen storage tank 21 to store more hydrogen in a low-temperature and high-pressure liquefied state.

[0086] Based on any of the above embodiments, in another optional embodiment of this application, the ammonia synthesis system can further include:

[0087] A synthesis compressor 41 connected to the input end of the ammonia synthesis device 4, which is used to compress the mixed gas of hydrogen and nitrogen and then deliver it to the ammonia synthesis device 4.

[0088] Refer to Figure 1 , after the hydrogen delivered through the main hydrogen transmission pipeline 205 and the nitrogen delivered through the main nitrogen transmission pipeline 300 are mixed together, they are further mixed and compressed by the synthesis compressor 41 and then can be filled into the ammonia synthesis device 4, providing power for the mixed gas of nitrogen and hydrogen to flow into the ammonia synthesis device 4.

[0089] Further optionally, a bypass pipeline 42 is also connected between the input end of the synthesis compressor 41 and the output end of the ammonia synthesis unit 4; a bypass control valve 421 connected to the controller is provided on the bypass pipeline 42; the controller is used to control the opening degree of the bypass control valve 421.

[0090] When the load power of the ammonia synthesis unit 4 decreases, resulting in a significant decrease in the pressure of the ammonia synthesis loop, the controller can control the opening degree of the bypass control valve 421 to open. Part of the post-reaction gas enters the inlet of the recycle section of the synthesis compressor 41 through the bypass pipeline 42, increasing the ammonia content entering the tower and reducing the ammonia net value. As a result, when the load of the ammonia synthesis unit 4 remains unchanged, the pressure of the ammonia synthesis unit 4 loop increases.

[0091] In summary, in the ammonia synthesis system of the present application, on the basis of using the green power generation device to provide the energy required for hydrogen production for the hydrogen production device, a hydrogen storage tank is further equipped. Thus, in practical applications, when the hydrogen production amount of the hydrogen production device decreases below the amount of hydrogen required for the current load power of the ammonia synthesis unit due to the fluctuation of the power generation of the green power generation, the hydrogen storage tank can be used to provide a certain amount of hydrogen for the ammonia synthesis unit, thereby reducing the impact on the stable operation of the entire ammonia synthesis system caused by using the energy provided by the green power generation device to produce hydrogen, and being beneficial to improving the safety and stability of the operation of the entire ammonia synthesis system.

[0092] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes the inherent elements thereof. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element. In addition, parts of the above technical solutions provided in the embodiments of the present application that are consistent with the corresponding technical solutions in the prior art in terms of implementation principles are not described in detail to avoid excessive elaboration.

[0093] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An ammonia synthesis system, characterized in that, It includes a green power generation device, a hydrogen production device, a nitrogen production device, an ammonia synthesis device, a hydrogen storage tank, and a controller; Among them, the green power generation device includes at least one of a wind power generation unit or a photovoltaic power generation unit; the green power generation device is used to provide electric energy for the hydrogen production device; The hydrogen production device is used to produce hydrogen by using the electric energy generated by the green power generation device; The output end of the hydrogen production device, the output end of the nitrogen production device, and the output end of the hydrogen storage tank are all connected to the input end of the ammonia synthesis device through gas pipelines; a first hydrogen control valve is arranged on the gas pipeline connecting the hydrogen production device and the ammonia synthesis device; a second hydrogen control valve is arranged on the gas pipeline connecting the hydrogen storage tank and the ammonia synthesis device; The controller is connected to the hydrogen production device, the nitrogen production device, and the ammonia synthesis device, and is used to control the start-up and operation of the hydrogen production device, the nitrogen production device, and the ammonia synthesis device, and adjust the magnitude of the operating power; The controller is respectively connected to the first hydrogen control valve and the second hydrogen control valve, and is used to respectively control the first hydrogen control valve and the second hydrogen control valve to open or close.

2. The ammonia synthesis system according to claim 1, characterized in that, The gas pipeline includes a hydrogen storage and transportation pipeline connecting the output end of the hydrogen production device and the input end of the hydrogen storage tank; among them, a third hydrogen control valve is arranged on the hydrogen storage and transportation pipeline; The controller is connected to the third hydrogen control valve, and is used to control the third hydrogen control valve to open or close.

3. The ammonia synthesis system according to claim 1, characterized in that, It also includes a hydrogen compressor with its input end connected to the hydrogen storage tank and its output end connected to the ammonia synthesis device; A hydrogen pressure gauge is arranged on the hydrogen storage tank.

4. The ammonia synthesis system according to claim 3, wherein The gas pipeline includes a first hydrogen transmission pipeline, a second hydrogen transmission pipeline, a third hydrogen transmission pipeline, a fourth hydrogen transmission pipeline, and a main hydrogen transmission pipeline; Among them, the first end of the first hydrogen transmission pipeline is connected to the output end of the hydrogen production device, and the second end of the first hydrogen transmission pipeline is connected to the first end of the main hydrogen transmission pipeline; the first hydrogen control valve is arranged on the first hydrogen transmission pipeline; The first end of the second hydrogen transmission pipeline is connected to the output end of the hydrogen storage tank, and the second end of the second hydrogen transmission pipeline is connected to the first end of the fourth hydrogen transmission pipeline; The first end of the third hydrogen transmission pipeline is connected to the output end of the hydrogen storage tank, and the second end of the third hydrogen transmission pipeline is connected to the input end of the hydrogen compressor; The first end of the fourth hydrogen transmission pipeline is connected to the output end of the hydrogen compressor, and the second end of the fourth hydrogen transmission pipeline is connected to the first end of the main hydrogen transmission pipeline; the second hydrogen control valve is arranged on the fourth hydrogen transmission pipeline; The second end of the main hydrogen transmission pipeline is connected to the input end of the ammonia synthesis device; A first hydrogen flowmeter and a second hydrogen flowmeter are respectively arranged on the first hydrogen transmission pipeline and the main hydrogen transmission pipeline.

5. The ammonia synthesis system according to any one of claims 1 to 4, characterized in that It also includes a nitrogen compressor and a nitrogen storage tank; the nitrogen production device includes an air separation nitrogen production device; The gas pipeline includes a first nitrogen transmission pipeline, a second nitrogen transmission pipeline, a third nitrogen transmission pipeline, and a main nitrogen transmission pipeline; The output end of the air separation nitrogen generation device is communicated with the input end of the nitrogen gas compressor through the first nitrogen transmission pipeline; the input end of the nitrogen gas storage tank is communicated with the output end of the nitrogen gas compressor through the second nitrogen transmission pipeline; the output end of the nitrogen gas storage tank is communicated with the input end of the nitrogen gas compressor through the third nitrogen transmission pipeline; The output end of the nitrogen gas compressor is communicated through the main nitrogen transmission pipeline; A first nitrogen control valve, a second nitrogen control valve and a third nitrogen control valve are respectively arranged on the main nitrogen transmission pipeline, the second nitrogen transmission pipeline and the third nitrogen transmission pipeline; The controller is respectively connected with the first nitrogen control valve, the second nitrogen control valve and the third nitrogen control valve, and is used for controlling the opening and closing of the first nitrogen control valve, the second nitrogen control valve and the third nitrogen control valve; A nitrogen gas flowmeter is arranged on the main nitrogen transmission pipeline.

6. The ammonia synthesis system according to claim 5, wherein A nitrogen gas pressure gauge is also arranged in the nitrogen gas storage tank.

7. The ammonia synthesis system according to claim 5, wherein The nitrogen gas storage tank is also connected with a cooling device for cooling and liquefying the nitrogen gas stored in the nitrogen gas storage tank.

8. The ammonia synthesis system according to claim 1, wherein It also includes a power storage device with an input end electrically connected to the green power generation device and an output end electrically connected to the hydrogen production device.

9. The ammonia synthesis system according to claim 1, wherein, It also includes a synthesis compressor communicated with the input end of the ammonia synthesis device, which is used for compressing the mixed gas of hydrogen and nitrogen and then transporting it to the ammonia synthesis device.

10. The ammonia synthesis system according to claim 9, characterized in that, A bypass pipeline is also communicated between the input end of the synthesis compressor and the output end of the ammonia synthesis device; a bypass control valve connected with the controller is arranged on the bypass pipeline; the controller is used for controlling the opening degree of the bypass control valve.

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