Ammonia synthesis system

Abstract

The present disclosure relates to an ammonia synthesis system comprising: an ammonia synthesis reactor; two or more catalyst layers included in the ammonia synthesis reactor; a backflow prevention plate disposed downstream of each of the catalyst layers other than the lowermost catalyst layer among the two or more catalyst layers, the backflow prevention plate preventing backflow of the mixed gas; a distribution device that is disposed upstream of each of the two or more catalyst layers and distributes a mixed gas to the catalyst layers; a mixed gas supply line arranged so as to supply a mixed gas to the distribution device; and a microwave heating device for an ammonia synthesis system in which the two or more catalyst layers are irradiated with microwaves, respectively.

Description

Technical Field

[0001] The present disclosure relates to an ammonia synthesis system. Background Art

[0002] In order to achieve the goal of reducing greenhouse gas emissions in response to climate change and the depletion of oil resources, the need to use new renewable energy is increasing. However, the areas that meet the appropriate conditions for producing new renewable energy are limited, so it is necessary to find means for storage and transportation. For example, there is a problem that new renewable energy, which is abundant in the equatorial region and the southern hemisphere, needs to be transported to the northern hemisphere where the demand for new renewable energy is high.

[0003] In addition, new renewable energy sources have temporal variability, so they must be accompanied by power storage devices. In order to solve the problems caused by the regional bias and temporal variability of new renewable energy sources, ammonia has attracted much attention as an energy carrier. In particular, ammonia can be liquefied at 8.5 atmospheres at room temperature, so it has the advantage of being easier to store and transport than hydrogen. Therefore, as an alternative solution to the problems caused by the regional bias and temporal variability of new renewable energy sources, it is necessary to pay attention to the solution of using electricity produced from new renewable energy sources to produce hydrogen and nitrogen, and using the produced hydrogen and nitrogen as raw materials to synthesize ammonia.

[0004] Hydrogen, the main raw material in ammonia synthesis, can be produced in a water electrolyzer driven by new renewable energy such as solar energy or wind energy. New renewable energy such as solar energy or wind energy has time variability. For example, solar energy cannot be used at night. Therefore, the ammonia synthesis system cannot always operate at a fixed flow rate, and there is a problem that the flow rate fluctuations that occur during the production cycle must be predicted and handled.

[0005] In addition, when the flow rate of a raw material such as hydrogen fed into the ammonia synthesis system is reduced, there is a problem that the flow rate distribution becomes more uneven at the front end of the catalyst layer included in the ammonia synthesis reactor.

[0006] Furthermore, the conventional ammonia synthesis system has a problem that a temperature deviation occurs between the center and the edge of the catalyst layer, especially in the initial stage of operation, thereby reducing the ammonia synthesis yield.

[0007] To this end, it is necessary to develop an ammonia synthesis system that can cope with flow fluctuations that occur during the production cycle, while solving the problems of uneven flow distribution at the front end of the catalyst layer and temperature deviations between the center and edge of the catalyst layer during the initial operation, which lead to reduced ammonia synthesis yield. Summary of the invention

[0008] According to an aspect of the present disclosure, an ammonia synthesis system capable of coping with flow rate fluctuations occurring during a production cycle may be provided.

[0009] According to another aspect of the present disclosure, an ammonia synthesis system can be provided that can maintain a uniform flow distribution at the front end of a catalyst layer included in an ammonia synthesis reactor even if the flow rate of a raw material such as hydrogen fed is reduced.

[0010] According to still another aspect of the present disclosure, an ammonia synthesis system can be provided that can make the temperature deviation between the center and the edge of the catalyst layer uniform in the initial stage of operation, thereby improving the ammonia synthesis yield.

[0011] According to one aspect of the present disclosure, an ammonia synthesis system can be provided that preheats a catalyst layer in an early stage of operation, thereby being able to improve the ammonia synthesis yield in the early stage of operation.

[0012] According to one aspect of the present disclosure, an ammonia synthesis system that optimizes the amount of energy required in the system during operation, thereby saving energy, can be provided.

[0013] According to an aspect of the present disclosure, an ammonia synthesis system can be provided which can uniformly use each catalytic layer during operation, thereby extending a replacement cycle of a catalyst.

[0014] The present disclosure provides an ammonia synthesis system, which includes: an ammonia synthesis reactor; two or more catalyst layers, which are included in the ammonia synthesis reactor; an anti-backflow plate, which is arranged downstream of each catalyst layer other than the lowest catalyst layer among the two or more catalyst layers to prevent the backflow of mixed gas; a distribution device, which is arranged upstream of each of the two or more catalyst layers to distribute the mixed gas to the catalyst layers; a mixed gas supply route, which is arranged to supply the mixed gas to the distribution device; and a microwave heating device, which irradiates microwaves to the two or more catalyst layers respectively.

[0015] According to an embodiment of the present disclosure, the ammonia synthesis system may further include: distribution plates respectively located between the catalytic layer and the distribution device.

[0016] According to an embodiment of the present disclosure, the ammonia synthesis system may further include: a plurality of mixed gas flow pipes fixed on the lower surface of the distribution plate for the mixed gas to flow.

[0017] According to one embodiment of the present disclosure, the mixed gas flow tube may have a bottom surface and a side surface connecting the bottom surface and the distribution plate, a plurality of upper openings formed along the circumference are formed on the upper side surface of the mixed gas flow tube, a plurality of middle openings formed along the circumference are formed on the middle side surface of the mixed gas flow tube, a plurality of lower openings formed along the circumference are formed on the lower side surface of the mixed gas flow tube, and the mixed gas flow tube includes a covering member, which is formed to surround at least a portion of the side surface of the mixed gas flow tube to provide a space for guiding the fluid that passes through the upper openings and then flows out to the outside of the side surface of the mixed gas flow tube toward the middle opening side.

[0018] According to an embodiment of the present disclosure, the mixed gas flow pipe may further include: a partition plate configured to divide the upper portion and the middle portion of the mixed gas flow pipe.

[0019] According to an embodiment of the present disclosure, the mixed gas supply routes may each include a flow regulating device.

[0020] According to an embodiment of the present disclosure, a plurality of openings may be formed on each of the anti-backflow plates, and an anti-backflow cover that is selectively opened according to a flow direction of the gas may be formed on the plurality of openings formed on each of the anti-backflow plates.

[0021] According to an embodiment of the present disclosure, the backflow prevention cover may be hingedly coupled to a position of a perimeter portion of a plurality of opening portions formed on each of the backflow prevention plates.

[0022] According to an embodiment of the present disclosure, a spring may be provided at the hinge joint portion of the hinge joint, so as to apply elastic force in a direction in which the anti-backflow cover approaches the distribution plate.

[0023] According to an embodiment of the present disclosure, the distribution device may be in the shape of a circular plate or a toroidal shape.

[0024] According to an embodiment of the present disclosure, in the ammonia synthesis system, ammonia synthesis may be performed at 10 to 300 bar.

[0025] According to an embodiment of the present disclosure, in the ammonia synthesis system, ammonia synthesis may be performed at 200 to 700° C.

[0026] According to an embodiment of the present disclosure, the ammonia synthesis system may further include: a heat exchanger disposed downstream of each of the two or more catalyst layers to remove heat from the effluent of the catalyst layer.

[0027] According to an embodiment of the present disclosure, the ammonia synthesis system can cope with flow rate fluctuations occurring during a production cycle.

[0028] According to the ammonia synthesis system of another embodiment of the present disclosure, even if the flow rate of the introduced raw material such as hydrogen is reduced, a uniform flow distribution can be maintained at the front end of the catalyst layer included in the ammonia synthesis reactor.

[0029] According to an ammonia synthesis system according to still another embodiment of the present disclosure, the temperature deviation between the center and the edge of the catalyst layer is made uniform at the initial stage of operation, thereby improving the ammonia synthesis yield.

[0030] According to an ammonia synthesis system according to an embodiment of the present disclosure, the catalyst layer is preheated at the initial stage of operation, thereby being able to improve the ammonia synthesis yield at the initial stage of operation.

[0031] According to an embodiment of the present disclosure, the ammonia synthesis system optimizes the amount of energy required in the system during operation, thereby saving energy.

[0032] According to an ammonia synthesis system according to an embodiment of the present disclosure, during operation, each catalyst layer is used evenly, thereby being able to extend a catalyst replacement cycle.

[0033] According to an ammonia synthesis system according to an embodiment of the present disclosure, ammonia can be synthesized in an eco-friendly manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 1 is a schematic diagram showing an ammonia synthesis system according to an embodiment of the present disclosure.

[0035] Figure 2 1 is a schematic diagram showing an ammonia synthesis system according to an embodiment of the present disclosure.

[0036] Figure 3 is a perspective view showing a distribution plate and a mixed gas flow pipe according to an embodiment of the present disclosure.

[0037] Figure 4 is a perspective view showing the interior of a mixed gas flow pipe according to an embodiment of the present disclosure.

[0038] Figure 5 is a perspective view showing the interior of a mixed gas flow pipe according to another embodiment of the present disclosure.

[0039] Figure 6 1 is a diagram showing a state in which a backflow prevention cover is closed in a backflow prevention plate according to an embodiment of the present disclosure.

[0040] Figure 7 1 is a diagram showing a state in which a backflow prevention cover is opened in a backflow prevention plate according to an embodiment of the present disclosure.

[0041] Figure numerals: 1: ammonia synthesis system, 10: ammonia synthesis reactor, 20, 21: catalytic layer, 30, 31: backflow prevention plate, 301: backflow prevention plate, 302: opening, 303: backflow prevention cover, 304: hinge, 40, 41: distribution device, 50, 51: mixed gas supply route, 60, 61: microwave heating device, 601, 602: microwave guide, 70, 71: distribution plate, 72: lower surface, 720: mixed gas flow tube, 722: side, 722a: upper part, 722b: middle part, 722c: lower part, 723: upper opening, 725: middle opening, 727: lower opening, 729: partition, 730: cover. DETAILED DESCRIPTION

[0042] The advantages, features and methods of achieving the advantages and features of the present invention will become clear through the embodiments described in detail below. However, the present invention is not limited to the embodiments disclosed below, and can be implemented in a variety of different forms. The embodiments are only used to make the disclosure of the present invention complete and to fully inform the scope of the invention to those with common knowledge in the technical field to which the present invention belongs. The present invention is only defined by the scope of the claims.

[0043] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification have the same meanings as commonly understood by those skilled in the art in the technical field to which the present disclosure belongs.

[0044] Unless otherwise indicated in the context, a singular form used in this specification may also include a plural form.

[0045] The numerical range used in this specification includes all values ​​within its range that include the lower limit and the upper limit, all values ​​logically derived from the form and span of the defined range, all values ​​of the double definition, and all possible combinations of the upper and lower limits within the numerical range defined in different forms. Unless otherwise defined in the specification of the present invention, values ​​that may exceed the numerical range due to experimental errors or rounding of numerical values ​​are also included in the defined numerical range.

[0046] The term "including" mentioned in this specification is an open description, which is equivalent to expressions such as "having", "containing", "having", "having characteristics", etc., and does not exclude factors, materials or processes that are not additionally listed.

[0047] Unless otherwise defined, the unit "%" used without particular reference in the present specification means "% by weight".

[0048] Unless otherwise defined, “A to B” in this specification means “A or more and B or less”.

[0049] Hereinafter, the ammonia synthesis system of the present disclosure will be described in detail. However, this is only an example, and the present disclosure is not limited to the specific embodiments described in the examples.

[0050] The present disclosure provides an ammonia synthesis system, which includes: an ammonia synthesis reactor; two or more catalyst layers, which are included in the ammonia synthesis reactor; an anti-backflow plate, which is arranged downstream of each catalyst layer other than the lowest catalyst layer among the two or more catalyst layers to prevent the backflow of mixed gas; a distribution device, which is arranged upstream of each of the two or more catalyst layers to distribute the mixed gas to the catalyst layers; a mixed gas supply route, which is arranged to supply the mixed gas to the distribution device; and a microwave heating device, which irradiates microwaves to the two or more catalyst layers respectively.

[0051] refer to Figure 1 and Figure 2 According to one embodiment of the present disclosure, an ammonia synthesis system 1 can be provided, which includes: an ammonia synthesis reactor 10; more than two catalytic layers 20, 21, which are included in the ammonia synthesis reactor 10; anti-backflow plates 30, 31, which are arranged downstream of each catalytic layer other than the lowest catalytic layer located among the more than two catalytic layers 20, 21 to prevent the mixed gas from backflowing; distribution devices 40, 41, which are arranged upstream of each of the more than two catalytic layers 20, 21 to distribute the mixed gas to the catalytic layers 20, 21; mixed gas supply routes 50, 51, which are arranged to supply the mixed gas to the distribution devices 40, 41; and microwave heating devices 60, 61, which irradiate microwaves to the more than two catalytic layers 20, 21 respectively.

[0052] Hereinafter, as an example of the ammonia synthesis system 1 of the present disclosure, an ammonia synthesis system including two catalytic layers may be described. Of course, an ammonia synthesis system including two or more catalytic layers, such as three, four, five, seven or ten catalytic layers, is included in an embodiment of the present disclosure.

[0053] According to an embodiment of the present disclosure, an ammonia synthesis system includes a mixed gas supply route to supply mixed gas to two or more catalyst layers respectively, so as to cope with flow rate changes occurring during the production cycle. For example, when the flow rate of the raw material to be fed is large, it can be fed through the mixed gas supply route 50 located at the upper end to pass through the catalyst layer 20 located at the uppermost end, and when the flow rate of the raw material to be fed is small, it can be fed through the mixed gas supply route 51 located at the lower end to pass through the catalyst layer 21 located at the lower end instead of the catalyst layer 20 located at the upper end, thereby operating. At this time, when the mixed gas is fed through the mixed gas supply route 51 located at the lower end to pass through the catalyst layer 21 located at the lower end, the backflow prevention plate 30 prevents the mixed gas from flowing back.

[0054] At this time, for convenience, in this specification, the flow rate changes that occur during the production cycle are roughly divided into three types, as described above, which can be divided into a small flow rate, a normal flow rate, and a large flow rate, which can be easily adjusted according to the common sense or judgment of ordinary technicians. It can be that the small flow rate refers to a situation where the annual average production flow rate (100%) is less than half (50%), the normal flow rate refers to a situation where the annual average production flow rate (100%) is more than half (50%) and less than 2 times (200%), and the large flow rate refers to a situation where the annual average production flow rate (100%) is more than 2 times (200%), but it is not limited to this.

[0055] On the one hand, when the flow rate is small as described above, the ammonia synthesis system can be operated by feeding the mixed gas through the mixed gas supply line 51 located at the lower end to pass through the catalyst layer 21 located at the lower end, so it is not necessary to maintain the temperature of the entire reactor. Therefore, during operation, the amount of energy required in the system can be optimized as needed, thereby saving energy.

[0056] In addition, when the ammonia synthesis system is in operation, each catalyst layer is used evenly, thereby being able to extend the catalyst replacement cycle. Generally, when the flow rate of the reaction fluid is small, the distribution performance at the upper part of the catalyst layer is reduced, resulting in differences in reaction performance between catalysts located at the same height. The catalyst replacement cycle is determined based on the reaction performance at the lower end of the catalyst layer. When the distribution performance is reduced due to a decrease in flow rate, resulting in a reduction in reaction performance in a portion of the catalyst layer area at the lower end, there is a problem of shortening the replacement cycle. However, as described in the ammonia synthesis system according to the present disclosure, as long as the catalyst layer is set to pass through different heights according to the flow rate and the distribution performance in each catalyst layer is improved, the catalyst layer can be used relatively evenly, thereby extending the catalyst replacement cycle.

[0057] In addition, according to an embodiment of the present disclosure, the ammonia synthesis system includes microwave heating devices 60 and 61, which can make the temperature deviation between the center and the edge of the catalyst layer uniform in the initial operation, thereby improving the ammonia synthesis yield. Specifically, the microwave heating device can make the temperature deviation between the center and the edge of the catalyst layer uniform by irradiating microwaves to the catalyst layer in the initial operation. In addition, the microwave heating device preheats the catalyst layer that is not fully preheated in the initial operation, thereby improving the ammonia synthesis yield in the initial operation.

[0058] For example, when the flow rate of the raw material is small, it can be operated to pass through the catalyst layer 21 located at the lower end instead of the catalyst layer 20 located at the upper end. At this time, the mixed gas is not fed to the catalyst layer 20 located at the upper end, so the temperature of the catalyst layer 20 located at the upper end decreases over time. Then, when the catalyst layer 20 located at the upper end is used again, the ammonia synthesis efficiency may decrease because the catalyst layer 20 located at the upper end is in a state of cooling. At this time, the microwave heating device is used to irradiate microwaves to the catalyst layer 20 located at the upper end in a state of cooling for preheating, so that even if the catalyst layer is reused for operation, excellent ammonia synthesis efficiency can be achieved.

[0059] The number of microwave heating devices may be 1 or more, 2 or more, 3 or more, 4 or more, 5 or more, or 8 or more, but not limited thereto, and the number of microwave heating devices may be increased according to the size of the reactor, and the location of the microwave heating devices may be adjusted for efficient microwave irradiation.

[0060] The ammonia synthesis system may further include microwave guides 601, 602. The microwave guides 601, 602 enable the microwaves irradiated from the microwave heating device to reach the catalyst layer more effectively. Of course, the shape or setting position of the guides may be changed according to the microwave waveform.

[0061] In one embodiment according to the present disclosure, the number of catalytic layers may be more than 2, more than 3, more than 4, more than 5, more than 6, more than 7, more than 10, less than 20, less than 10, less than 8, less than 7, less than 6, less than 5, less than 4, less than 3, less than 2, or intervals of these values. The number of catalytic layers and the number of distribution devices may be the same.

[0062] In an embodiment according to the present disclosure, the mixed gas may include at least one selected from the group consisting of hydrogen and nitrogen.

[0063] The hydrogen may be produced in a device driven by new renewable energy sources. Specifically, the hydrogen may be produced in a water electrolyzer driven by new renewable energy sources.

[0064] The new renewable energy may include at least one selected from the group consisting of solar heat, sunlight, biomass, wind, hydropower, geothermal energy, ocean energy, and waste energy. The new renewable energy has temporal variability. For example, solar energy cannot be used at night. Therefore, when hydrogen is produced in a device driven by the new renewable energy, the ammonia synthesis system cannot always operate at a certain flow rate. That is, due to the temporal variability of the new renewable energy, an ammonia synthesis system that can cope with the flow rate changes that occur during the production cycle is required.

[0065] In addition, the mixed gas supplied in the mixed gas supply lines 50 and 51 may be a mixed gas of low temperature. Therefore, the mixed gas supplied in the mixed gas supply lines 50 and 51 plays a role in cooling the mixed gas, and can also function as a means for cooling the mixed gas flowing in the ammonia synthesis system. For example, the mixed gas of low temperature can be used as a cooling means for cooling the mixed gas supplied to the catalyst layer.

[0066] The ammonia synthesis system according to an embodiment of the present disclosure may further include distribution plates 70 , 71 , which are respectively located between the catalytic layers 20 , 21 and the distribution devices 40 , 41 .

[0067] In addition, the ammonia synthesis system according to an embodiment of the present disclosure may further include: a plurality of mixed gas flow pipes 720 fixed to the lower surface 72 of the distribution plates 70 and 71 for the mixed gas to flow.

[0068] The ammonia synthesis system further includes a distribution plate and a mixed gas flow pipe so that even if the flow rate of a raw material such as hydrogen is reduced, uniform flow distribution can be maintained at the front end of a catalyst layer included in the ammonia synthesis reactor.

[0069] refer to Figure 3 and Figure 4 The mixed gas flow tube 720 may have a bottom surface and a side surface 722 connecting the bottom surface and the distribution plate.

[0070] A plurality of upper openings 723 formed at intervals along the circumference may be formed on the side of the upper portion 722a of the mixed gas flow pipe 720, a plurality of middle openings 725 formed at intervals along the circumference may be formed on the side of the middle portion 722b of the mixed gas flow pipe 720, and a plurality of lower openings 727 formed at intervals along the circumference may be formed on the side of the lower portion 722c of the mixed gas flow pipe 720. The mixed gas flows through the upper openings 723, the middle openings 725, and the lower openings 727. The mixed gas flow pipe 720 may include a cover 730 formed to surround at least a portion of the side of the mixed gas flow pipe 720 to provide a space for guiding the fluid that flows out to the outside of the side of the mixed gas flow pipe 720 after passing through the upper openings 723 toward the middle openings 725. The cover 730 may be formed to surround at least one of the group consisting of the upper portion and the middle portion of the side of the mixed gas flow pipe 720.

[0071] The cover 730 guides the fluid that has passed through the upper opening 723 and then flowed out to the outside of the side of the mixed gas flow tube 720 to the middle opening 725. This forms a flow that moves to the outside of the side of the mixed gas flow tube 720 and then moves to the inside of the side again. The flow formed in this way can more smoothly complete the mixing of the fluids.

[0072] refer to Figure 5 , the mixed gas flow tube 720 may further include a partition 729 configured to divide the upper portion and the middle portion of the mixed gas flow tube 720. The partition 729 completely separates the upper portion and the middle portion of the mixed gas flow tube 720 so that the fluid cannot move. Therefore, the fluid flowing into the upper portion of the mixed gas flow tube 720 does not directly drop to the middle portion due to the partition 729, but flows out to the space between the mixed gas flow tube 720 and the cover 730 through the upper opening portion 723. Thereafter, the fluid flows into the mixed gas flow tube through the middle opening portion 725 in the space, drops to the lower portion, and flows out to the outside of the mixed gas flow tube 720 through the lower opening portion 727. As described above, by forming a flow that flows out to the outside of the mixed gas flow tube 720, then flows into the inside again, and then flows out again, the mixing of the fluid can be completed more smoothly, and a uniform flow distribution can be maintained at the front end of the catalyst layer.

[0073] In one embodiment of the present disclosure, each of the mixed gas supply routes 50 and 51 may include a flow regulating device. The flow regulating device can independently control the flow rate of the mixed gas in each of the mixed gas supply routes. Specifically, the flow regulating device independently regulates the flow rate of the mixed gas flowing on each of the mixed gas supply routes, so that the flow rate of the mixed gas entering the distribution device is maintained within a desired flow range. The flow regulating device may be a flow regulating valve.

[0074] In one embodiment of the present disclosure, the mixed gas supply routes 50 and 51 may each be a route branching from a main supply route. In addition, the mixed gas supply routes 50 and 51 may each be supplied with at least one selected from the group consisting of nitrogen and hydrogen from a separate supply route.

[0075] In one embodiment according to the present disclosure, a plurality of openings 302 may be formed on each of the backflow prevention plates 30 and 31, and a backflow prevention cover 303 that is selectively opened according to the flow direction of the gas may be formed on the plurality of openings 302 formed on each of the backflow prevention plates 30 and 31. The ammonia synthesis system according to the present disclosure includes the backflow prevention plates 30 and 31 formed with the backflow prevention covers 303, so that even if the mixed gas is fed through the mixed gas supply route 51 located at the lower end to pass through the catalyst layer 21 located at the lower end, the backflow of the mixed gas can be prevented. In addition, as described above, by realizing a system capable of preventing the backflow of the mixed gas, the amount of energy required in the system can be optimized as needed during operation, thereby saving energy, and each catalyst layer can be used evenly, thereby extending the replacement cycle of the catalyst.

[0076] refer to Figure 6 and Figure 7The backflow prevention cover 303 may be coupled to a position of the perimeter of the plurality of openings 302 formed on each of the backflow prevention plates 30 , 31 via a hinge 304 . Figure 7 The backflow prevention cover 303 connected by the hinge 304 is shown in an open state. When the mixed gas flows from the upstream to the downstream of the backflow prevention plates 30 and 31, the backflow prevention cover 303 remains in an open state, so that the mixed gas flows normally. Figure 6 The backflow prevention cover 303 connected by the hinge 304 is shown in a closed state. When the mixed gas wants to flow from the downstream to the upstream of the backflow prevention plates 30 and 31, the backflow prevention cover 303 is closed due to the flow of the mixed gas flowing from the downstream to the upstream. Due to this principle, the backflow prevention plates 30 and 31 according to the present disclosure can prevent the mixed gas from flowing back.

[0077] In one embodiment of the present disclosure, a spring is provided at a hinge 304 joint portion connected by the hinge 304 , so as to apply an elastic force in a direction in which the backflow prevention cover 303 approaches the distribution plate.

[0078] In an embodiment according to the present disclosure, the distribution devices 40 and 41 may be in a disc shape or a toroidal shape, but are not limited thereto, and commonly used gas distribution devices may be used.

[0079] In the ammonia synthesis system according to an embodiment of the present disclosure, ammonia synthesis may be performed at 1 to 500 bar or 10 to 300 bar.

[0080] In addition, in the ammonia synthesis system according to an embodiment of the present disclosure, ammonia synthesis may be performed at 100 to 800°C or 200 to 700°C.

[0081] The ammonia synthesis system according to one embodiment of the present disclosure may further include: a heat exchanger, which is arranged downstream of each of the two or more catalyst layers to remove heat from the effluent of the catalyst layer. The heat exchanger can be arranged to surround the catalyst layer or its periphery. The ammonia synthesis system according to the present disclosure also includes a heat exchanger, so that an additional heat removal unit other than the supply cooling mixed gas can be provided. Thereby, the ammonia synthesis system can be flexibly operated.

[0082] The above-described contents are merely examples of applying the principles of the present disclosure, and other structures may also be included without departing from the scope of the present disclosure.

Claims

1. An ammonia synthesis system, comprising: Ammonia synthesis reactor; Two or more catalytic layers, which are included in the ammonia synthesis reactor; an anti-backflow plate, which is arranged downstream of each of the catalyst layers other than the lowest catalyst layer among the two or more catalyst layers to prevent the mixed gas from backflowing; a distribution device, which is arranged upstream of each of the two or more catalyst layers and distributes the mixed gas to the catalyst layer; a mixed gas supply route arranged to supply the mixed gas to the distribution device; and A microwave heating device irradiates microwaves to each of the two or more catalyst layers.

2. The ammonia synthesis system according to claim 1, wherein: The ammonia synthesis system further includes distribution plates respectively located between the catalytic layer and the distribution device.

3. The ammonia synthesis system according to claim 2, wherein: The ammonia synthesis system further includes: a plurality of mixed gas flow pipes fixed on the lower surface of the distribution plate for allowing the mixed gas to flow.

4. The ammonia synthesis system according to claim 3, wherein: The mixed gas flow pipe has a bottom surface and a side surface connecting the bottom surface and the distribution plate. A plurality of upper openings are formed on the upper side of the mixed gas flow pipe and are spaced apart along the circumference. A plurality of intermediate openings are formed on the intermediate side of the mixed gas flow pipe and are spaced apart along the circumference. A plurality of lower openings are formed on the lower side of the mixed gas flow pipe and are spaced apart along the circumference. The mixed gas flow pipe includes a cover formed to surround at least a portion of a side surface of the mixed gas flow pipe to provide a space for guiding a fluid that flows out of the side surface of the mixed gas flow pipe after passing through the upper opening toward the middle opening.

5. The ammonia synthesis system according to claim 4, wherein: The mixed gas flow pipe further includes a partition plate configured to divide the upper portion and the middle portion of the mixed gas flow pipe.

6. The ammonia synthesis system according to claim 1, wherein: The mixed gas supply routes each include a flow regulating device.

7. The ammonia synthesis system according to claim 1, wherein: A plurality of openings are formed on each of the backflow prevention plates. A backflow prevention cover that is selectively opened according to a gas flow direction is formed at a plurality of openings formed on each of the backflow prevention plates.

8. The ammonia synthesis system according to claim 7, wherein: The backflow prevention cover is hingedly coupled to a position of a peripheral portion of a plurality of openings formed on each of the backflow prevention plates.

9. The ammonia synthesis system according to claim 8, wherein: A spring is provided at the hinge joint portion of the hinge joint, so as to apply elastic force to the direction in which the backflow prevention cover approaches the distribution plate.

10. The ammonia synthesis system according to claim 1, wherein: The distribution device is in the shape of a circular plate or a ring.

11. The ammonia synthesis system according to claim 1, wherein: In the ammonia synthesis system, ammonia synthesis is performed at 10 to 300 bar.

12. The ammonia synthesis system according to claim 1, wherein: In the ammonia synthesis system, ammonia synthesis is performed at 200 to 700°C.

13. The ammonia synthesis system according to claim 1, wherein: The ammonia synthesis system further includes a heat exchanger disposed downstream of each of the two or more catalyst layers to remove heat from an outflow of the catalyst layer.

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