Ammonia exhaust system and ammonia exhaust method

Abstract

This invention provides an ammonia exhaust system that can efficiently remove ammonia from inside the enclosure, even if ammonia leaks within the enclosure. [Solution] The ammonia exhaust system 1 comprises an ammonia device 10 that uses liquid ammonia, a housing 20 that houses the ammonia device 10, a gaseous ammonia detection unit 40 that detects gaseous ammonia leaking from the ammonia device 10 into the housing 20, an exhaust passage 60 that exhausts the gas from inside the housing 20, an ammonia removal unit 70 that removes ammonia in the exhaust passage 60, and a control unit 90 that controls the ammonia removal unit 70 to remove ammonia in the exhaust passage 60 when gaseous ammonia is detected by the gaseous ammonia detection unit 40.

Description

Technical Field

[0001] The present disclosure relates to an ammonia exhaust system and an ammonia exhaust method.

Background Art

[0002] In recent years, ammonia has attracted attention as an alternative fuel to fossil fuels. Ammonia contains no carbon in its molecules and does not generate carbon dioxide even when burned. Therefore, by including ammonia in the fuel, the amount of carbon dioxide emitted into the atmosphere can be reduced. On the other hand, in plants, apparatuses, equipment and the like that handle ammonia, safety measures may be established based on various laws and regulations.

[0003] Patent Document 1 discloses a working medium leakage detection device including a control unit that outputs an indication of leakage of the working medium when a first sensor detects the working medium while a second sensor does not detect the working medium. It is also disclosed that at least one of the first sensor and the second sensor includes a semiconductor sensor capable of detecting moisture, the working medium, carbon monoxide, hydrogen sulfide and ammonia.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when ammonia leaks inside a casing that houses ammonia-related equipment, it is necessary to detoxify the gaseous ammonia inside the casing.

[0006] An object of the present disclosure is to provide an ammonia exhaust system and an ammonia exhaust method capable of efficiently removing ammonia inside a casing even when ammonia leaks inside the casing. [Means for solving the problem]

[0007] The ammonia exhaust system according to this disclosure comprises an ammonia device that utilizes liquid ammonia, a housing that houses the ammonia device, a gaseous ammonia detection unit that detects gaseous ammonia leaking from the ammonia device into the housing, and an exhaust passage for exhausting the gas from the housing. The ammonia exhaust system also comprises a detoxification unit that detoxifies ammonia in the exhaust passage and a control unit that controls the detoxification unit to detoxify ammonia in the exhaust passage when gaseous ammonia is detected by the gaseous ammonia detection unit.

[0008] The ammonia exhaust system according to this disclosure comprises an ammonia device that utilizes liquid ammonia, a housing that houses the ammonia device, and a gaseous ammonia detection unit that detects gaseous ammonia leaking from the ammonia device into the housing. The ammonia exhaust system comprises an exhaust passage for exhausting the gas inside the housing with an exhaust fan, and a control unit that controls the operation of the exhaust fan when gaseous ammonia is detected by the gaseous ammonia detection unit.

[0009] The ammonia exhaust system may include an ammonia removal unit that removes ammonia from the exhaust passage. The control unit may control the ammonia removal unit to remove ammonia from the exhaust passage when gaseous ammonia is detected by the gaseous ammonia detection unit.

[0010] The ammonia exhaust system may be housed in a casing and may include a containment dike for storing liquid ammonia leaking from ammonia equipment.

[0011] The ammonia exhaust method according to this disclosure includes a first gaseous ammonia detection step for detecting gaseous ammonia leaking from an ammonia equipment housed within the enclosure and utilizing liquid ammonia, and an exhaust step for exhausting the gas inside the enclosure through an exhaust channel. The ammonia exhaust method also includes a step for abolishing the ammonia in the exhaust channel when gaseous ammonia is detected.

[0012] The ammonia exhaust method according to this disclosure includes a first gaseous ammonia detection step for detecting gaseous ammonia leaking from an ammonia equipment housed within the enclosure and utilizing liquid ammonia. The ammonia exhaust method also includes an exhaust step, when gaseous ammonia is detected, for exhausting the gas inside the enclosure by controlling the drive of an exhaust fan. [Effects of the Invention]

[0013] According to this disclosure, it is possible to provide an ammonia exhaust system and an ammonia exhaust method that can efficiently remove ammonia from inside a housing even if ammonia leaks inside the housing. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram showing an ammonia exhaust system according to one embodiment. [Figure 2] This block diagram shows a partial configuration of an ammonia exhaust system according to one embodiment. [Modes for carrying out the invention]

[0015] Several exemplary embodiments will be described below with reference to the drawings. Note that the dimensional ratios in the drawings are exaggerated for illustrative purposes and may differ from the actual ratios.

[0016] As shown in Figure 1, the ammonia exhaust system 1 according to this embodiment includes an ammonia utilization system 5, a housing 20, a liquid containment dike 30, a first gaseous ammonia detection unit 40, a liquid ammonia detection unit 50, an exhaust flow path 60, a detoxification unit 70, a second gaseous ammonia detection unit 80, and a control unit 90.

[0017] The ammonia utilization system 5 utilizes liquid ammonia. The ammonia utilization system 5 may include, for example, at least one selected from the group consisting of ammonia production equipment, ammonia receiving equipment, ammonia storage equipment, ammonia liquefaction plant equipment, ammonia transport equipment, ammonia supply equipment, and a power plant that utilizes ammonia.

[0018] The ammonia utilization system 5 includes at least one ammonia equipment 10. That is, the ammonia exhaust system 1 is equipped with ammonia equipment 10. In this embodiment, the ammonia utilization system 5 includes a plurality of ammonia equipment 10, and the ammonia equipment 10 are connected by an ammonia flow path 11. The ammonia equipment 10 utilizes liquid ammonia. In this embodiment, the ammonia equipment 10 includes a tank 12, a supply unit 13, and a gas turbine 14. The ammonia flow path 11 is provided with the tank 12, the supply unit 13, and the gas turbine 14.

[0019] Tank 12 stores liquid ammonia. The supply unit 13 receives the liquid ammonia stored in Tank 12. The liquid ammonia may be vaporized, and the supply unit 13 supplies at least one of liquid ammonia and gaseous ammonia to the gas turbine 14. The supply unit 13 may include, for example, a compressor and a flow control valve. The supply unit 13 may also include a vaporizer that vaporizes the liquid ammonia to produce gaseous ammonia.

[0020] The gas turbine 14 includes a compressor 14a, a combustor 14b, a turbine 14c, and a generator 14d. The compressor 14a compresses air and supplies the compressed air to the combustor 14b. An ammonia flow path 11 is connected to the combustor 14b, and ammonia is supplied through the ammonia flow path 11. The combustor 14b combusts ammonia using the air supplied from the compressor 14a. Combustion gas generated by combustion of ammonia in the combustor 14b is supplied to the turbine 14c. The turbine 14c is rotated by the combustion gas discharged from the combustor 14b. The compressor 14a is connected to the turbine 14c via a shaft 14e. Further, a generator 14d is connected to the turbine 14c, and the generator 14d generates power as the turbine 14c rotates.

[0021] The housing 20 accommodates the ammonia equipment 10. The housing 20 also accommodates a liquid containment dike 30, a first gaseous ammonia detection unit 40, and a liquid ammonia detection unit 50. The housing 20 is only required to be capable of accommodating the ammonia equipment 10 and the like. The housing 20 may be, for example, a room of a building or a container. The housing 20 may have an openable and closable portion such as a shutter. Further, the housing 20 may include a container formed of a material containing at least one selected from the group consisting of metal, plastic, wood, and ceramic.

[0022] The housing 20 includes a first housing 21, a second housing 22, and a third housing 23. The first housing 21 accommodates a tank 12, a first liquid containment dike 31, a tank-use gaseous ammonia detection unit 41, and a first liquid ammonia detection unit 51. The second housing 22 accommodates a supply unit 13, a second liquid containment dike 32, a supply unit-use gaseous ammonia detection unit 42, and a second liquid ammonia detection unit 52. The third housing 23 accommodates the gas turbine 14, a third liquid containment dike 33, a gas turbine-use gaseous ammonia detection unit 43, and a third liquid ammonia detection unit 53.

[0023] The liquid containment dike 30 stores liquid ammonia leaked from the ammonia-related equipment 10. The liquid containment dike 30 is arranged below the ammonia-related equipment 10. The liquid containment dike 30 receives and stores the liquid ammonia that has leaked from the ammonia-related equipment 10 and fallen from the ammonia-related equipment 10. Note that if the housing 20 itself can serve the role of the liquid containment dike 30, the ammonia exhaust system 1 does not necessarily need to be provided with the liquid containment dike 30.

[0024] The liquid containment dike 30 includes a first liquid containment dike 31, a second liquid containment dike 32, and a third liquid containment dike 33. The first liquid containment dike 31 is arranged below the tank 12, and receives and stores the liquid ammonia that has leaked from the tank 12 and fallen from the tank 12. The second liquid containment dike 32 is arranged below the supply unit 13, and receives and stores the liquid ammonia that has leaked from the supply unit 13 and fallen from the supply unit 13. The third liquid containment dike 33 is arranged below the gas turbine 14, and receives and stores the liquid ammonia that has leaked from the gas turbine 14 and fallen from the gas turbine 14.

[0025] The first gaseous ammonia detection unit 40 detects gaseous ammonia inside the housing 20 that has leaked from the ammonia-related equipment 10. The first gaseous ammonia detection unit 40 is arranged above the ammonia-related equipment 10. Since ammonia has a lower density than air, the above arrangement enables highly sensitive detection of the gaseous ammonia leaked from the ammonia-related equipment 10. The gaseous ammonia detected by the first gaseous ammonia detection unit 40 may be gaseous ammonia that has vaporized and leaked inside the ammonia-related equipment 10, gaseous ammonia formed by vaporization of liquid ammonia leaked from the ammonia-related equipment 10, or a mixture of these gaseous ammonia types. The first gaseous ammonia detection unit 40 may be a device that analyzes the emission spectrum of ammonia, or a device that draws in gaseous ammonia to detect the presence or absence of gaseous ammonia.

[0026] The first gaseous ammonia detection unit 40 may include a tank gaseous ammonia detection unit 41, a supply unit gaseous ammonia detection unit 42, and a gas turbine gaseous ammonia detection unit 43. The tank gaseous ammonia detection unit 41 is located above the tank 12 and detects gaseous ammonia leaking from the tank 12. The supply unit gaseous ammonia detection unit 42 is located above the supply unit 13 and detects gaseous ammonia leaking from the supply unit 13. The gas turbine gaseous ammonia detection unit 43 is located above the gas turbine 14 and detects gaseous ammonia leaking from the gas turbine 14.

[0027] The liquid ammonia detection unit 50 detects liquid ammonia leaking from the ammonia equipment 10. The liquid ammonia detection unit 50 may detect liquid ammonium before it falls from the ammonia equipment 10 and reaches the containment dike 30, or it may detect liquid ammonia that has fallen from the ammonia equipment 10 and is stored within the containment dike 30.

[0028] The liquid ammonia detection unit 50 may be located within the containment dike 30. If liquid ammonia leaks, it will be stored within the containment dike 30. Therefore, with the above configuration, the liquid ammonia detection unit 50 can efficiently detect the liquid ammonia stored within the containment dike 30. The liquid ammonia detection unit 50 may analyze the radiation spectrum of ammonia, or it may detect the liquid level of the liquid ammonia.

[0029] The liquid ammonia detection unit 50 may include a first liquid ammonia detection unit 51, a second liquid ammonia detection unit 52, and a third liquid ammonia detection unit 53. The first liquid ammonia detection unit 51 is located within the first containment dike 31 and detects liquid ammonia leaking from the tank 12. The second liquid ammonia detection unit 52 is located within the second containment dike 32 and detects liquid ammonia leaking from the supply unit 13. The third liquid ammonia detection unit 53 is located within the third containment dike 33 and detects liquid ammonia leaking from the gas turbine 14.

[0030] The exhaust passage 60 exhausts the gas inside the housing 20. The exhaust passage 60 may also exhaust the gas inside the housing 20 with an exhaust fan 61. The exhaust passage 60 is connected to the top of the housing 20. An exhaust fan 61 is provided inside the exhaust passage 60. By rotating the exhaust fan 61, the gas inside the housing 20 can be discharged to the outside of the housing 20. The exhaust fan 61 may rotate continuously, or it may be driven according to the ammonia detection result as described later. The exhaust passage 60 includes a first exhaust passage 62 connected to the housing 20 and extending vertically, and a second exhaust passage 63 connected to the first exhaust passage 62 and extending, for example, horizontally. The exhaust gas is discharged from the exhaust passage 60 to the outside of the ammonia exhaust system 1. A detoxification unit 70 is provided in the exhaust passage 60.

[0031] The ammonia removal unit 70 removes ammonia from the exhaust passage 60. This configuration allows for the removal of ammonia contained in the exhaust gas discharged from the housing 20. The method of removing ammonia is not particularly limited, and ammonia can be removed by various methods. The ammonia removal unit 70 may remove ammonia by, for example, liquid, foam, powder, gas, and chemicals.

[0032] The abatement unit 70 may spray an absorbent liquid that absorbs gaseous ammonia. With this configuration, gaseous ammonia in the exhaust gas is absorbed by the absorbent liquid sprayed by the abatement unit 70. Therefore, the concentration of gaseous ammonia in the exhaust gas can be reduced. The absorbent liquid may contain water. The water may be seawater, freshwater, or tap water. The abatement unit 70 includes a nozzle 71 for spraying the absorbent liquid, a pipe 72 connected to the nozzle 71, and a valve 73 provided in the pipe 72 for supplying or stopping the absorbent liquid to the nozzle 71 by opening and closing it. The absorbent liquid is supplied to the pipe 72, and the absorbent liquid is supplied from the pipe 72 to the nozzle 71. The abatement unit 70 may include at least one nozzle 71, may include a single nozzle 71, or may include multiple nozzles 71.

[0033] A drainage channel 74 is connected to the exhaust channel 60. A drainage storage section 75 is connected to the drainage channel 74. The drainage liquid, which is the absorbent liquid that has been sprayed in the abatement section 70 and absorbed gaseous ammonia, is discharged from the exhaust channel 60 through the drainage channel 74 and stored in the drainage storage section 75. The drainage storage section 75 may be a drainage tank or the like. The drainage liquid may be used as a reducing agent for denitrification or it may be disposed of. In addition, water may be supplied to the drainage liquid to control the concentration of ammonia contained in the drainage liquid stored in the drainage storage section 75. This reduces the ammonia concentration of the drainage liquid and suppresses the diffusion of ammonia in the drainage liquid into the surrounding atmosphere. It also allows the ammonia concentration to be adjusted to a level suitable for use as a reducing agent for denitrification. The exhaust channel 60 may be provided with a backflow prevention structure such as a slope structure and a shielding plate to prevent the drainage liquid from flowing back into the housing 20.

[0034] The second gaseous ammonia detection unit 80 is located within the exhaust flow path 60. The second gaseous ammonia detection unit 80 detects gaseous ammonia contained in the exhaust gas from which gaseous ammonia has been removed by the absorbent liquid sprayed by the abatement unit 70. Although gaseous ammonia is removed from the exhaust gas by the abatement unit 70, it is possible that gaseous ammonia may remain in the gas if the concentration of gaseous ammonia in the exhaust gas is high. However, by including the second gaseous ammonia detection unit 80 in the ammonia exhaust system 1, it is possible to check whether gaseous ammonia remains in the exhaust gas and, for example, warn the operator.

[0035] The control unit 90 is a general-purpose computer including a CPU (Central Processing Unit), storage devices such as non-volatile memory, an input unit, and an output unit. The control unit 90 can control the abatement unit 70 based on a program stored in the storage device. As shown in Figure 2, the control unit 90 is electrically connected to the first gaseous ammonia detection unit 40, the liquid ammonia detection unit 50, the exhaust fan 61, the abatement unit 70, and the second gaseous ammonia detection unit 80. Signals output from the first gaseous ammonia detection unit 40, the liquid ammonia detection unit 50, and the second gaseous ammonia detection unit 80 are input to the input unit. The output unit outputs the results determined based on the input signals to the abatement unit 70 and the second gaseous ammonia detection unit 80.

[0036] The control unit 90 may control the abolition unit 70 to abolish ammonia in the exhaust passage 60 when gaseous ammonia is detected by the first gaseous ammonia detection unit 40. With this configuration, the abolition unit 70 does not need to be driven when gaseous ammonia is not leaking inside the housing 20. Therefore, even if ammonia leaks inside the housing 20, the ammonia inside the housing 20 can be efficiently removed.

[0037] The control unit 90 may control the abatement unit 70 to spray the absorbent solution when gaseous ammonia is detected by the first gaseous ammonia detection unit 40. The control unit 90 may also control the abatement unit 70 so that it does not spray the absorbent solution when gaseous ammonia is not detected by the first gaseous ammonia detection unit 40. The control unit 90 may also control the abatement unit 70 to open the valve 73 when the nozzle 71 sprays the absorbent solution, and to close the valve 73 when the nozzle 71 does not spray the absorbent solution.

[0038] The control unit 90 may control the operation of the exhaust fan 61 when the first gaseous ammonia detection unit 40 detects gaseous ammonia. With this configuration, the exhaust fan 61 does not need to be driven when gaseous ammonia is not leaking inside the housing 20. Therefore, even if ammonia leaks inside the housing 20, the ammonia inside the housing 20 can be efficiently removed. The control unit 90 may also control the exhaust airflow by controlling the rotation speed of the exhaust fan 61.

[0039] The control unit 90 may determine that gaseous ammonia has been detected if the indicator of gaseous ammonia detected by the first gaseous ammonia detection unit 40 is above a threshold. On the other hand, the control unit 90 may determine that gaseous ammonia has not been detected if the indicator of gaseous ammonia detected by the first gaseous ammonia detection unit 40 is below a threshold. Examples of indicators for ammonia include the concentration of ammonia and the intensity of the ammonia spectrum.

[0040] The control unit 90 may control an alarm device (not shown) to sound an alarm when the first gaseous ammonia detection unit 40 detects gaseous ammonia. The control unit 90 may also control an alarm device (not shown) to sound an alarm when the liquid ammonia detection unit 50 detects liquid ammonia. The alarm device may, for example, sound an alarm instructing nearby workers to evacuate safely and explaining the situation.

[0041] In addition, the ammonia exhaust system 1 may acquire images using, for example, a thermal camera or an imaging device capable of acquiring spectral intensity, and use the acquired images to detect ammonia and determine whether or not ammonia is present.

[0042] The control unit 90 may control the amount of absorbent liquid sprayed by the abatement unit 70 when gaseous ammonia is detected by the second gaseous ammonia detection unit 80. This can reduce the amount of gaseous ammonia remaining in the exhaust gas. The abatement unit 70 includes a plurality of nozzles 71, and when gaseous ammonia is detected by the second gaseous ammonia detection unit 80, the number of nozzles 71 spraying the absorbent liquid may be increased to increase the amount of absorbent liquid. Alternatively, when gaseous ammonia is detected by the second gaseous ammonia detection unit 80, the abatement unit 70 may increase the amount of absorbent liquid sprayed from each nozzle 71 to increase the amount of absorbent liquid sprayed from the abatement unit 70.

[0043] In this embodiment, the ammonia exhaust system 1 comprises a plurality of ammonia equipment 10 and a plurality of housings 20, with one housing 20 housing one ammonia equipment 10. However, a plurality of ammonia equipment 10 may be housed in a single housing 20. Also, in this embodiment, an exhaust passage 60 is connected to each housing 20, and an exhaust fan 61 is provided in each exhaust passage 60. However, a single exhaust passage 60 may be connected to a plurality of housings 20, and an exhaust fan 61 may be provided in each exhaust passage 60.

[0044] In this embodiment, the exhaust passage 60 was connected to the upper part of the housing 20, but the location of connection of the exhaust passage 60 is not particularly limited and may be connected to the side wall of the housing 20. Furthermore, the exhaust passage 60 in this embodiment included a first exhaust passage 62 extending in the vertical direction and a second exhaust passage 63 extending in the horizontal direction. However, the shape of the exhaust passage 60 is not particularly limited. Furthermore, in this embodiment, the exhaust fan 61 was arranged within the exhaust passage 60, but the location of arrangement of the exhaust fan 61 is not particularly limited. In addition, the ammonia exhaust system 1 may include a blocking part, such as a damper (not shown), that blocks the exhaust passage 60 to contain the ammonia inside the housing 20 and prevent ammonia from leaking to the outside when the function of the exhaust fan 61 or the abatement unit 70 stops. Furthermore, the ammonia exhaust system 1 may include a vacuum device that can discharge the ammonia contained inside the housing 20 to the outside of the housing 20 without using the exhaust fan 61, and may be configured to allow such a vacuum device to be added later.

[0045] Next, the effects of the ammonia exhaust system 1 and ammonia exhaust method according to this embodiment will be described.

[0046] The ammonia exhaust system 1 comprises an ammonia device 10 that utilizes liquid ammonia, a housing 20 that houses the ammonia device 10, and a first gaseous ammonia detection unit 40 that detects gaseous ammonia leaking from the ammonia device 10 into the housing 20. The ammonia exhaust system 1 also comprises an exhaust passage 60 for exhausting the gas from the housing 20 and a detoxification unit 70 for detoxifying the ammonia in the exhaust passage 60. The ammonia exhaust system 1 includes a control unit 90 that controls the detoxification unit 70 to detoxify the ammonia in the exhaust passage 60 when gaseous ammonia is detected by the first gaseous ammonia detection unit 40.

[0047] The ammonia exhaust method includes a first gaseous ammonia detection step for detecting gaseous ammonia leaking from an ammonia equipment 10 that is housed in the housing 20 and utilizes liquid ammonia. The ammonia exhaust method includes an exhaust step for exhausting the gas inside the housing 20 through an exhaust channel 60, and a step for detoxifying the ammonia in the exhaust channel 60 when gaseous ammonia is detected.

[0048] According to the ammonia exhaust system 1 and ammonia exhaust method of this embodiment, even if ammonia leaks inside the housing 20, the first gaseous ammonia detection unit 40 can detect the gaseous ammonia inside the housing 20. The exhaust passage 60 exhausts the gas inside the housing 20, and the abolition unit 70 abolishes the ammonia in the exhaust passage 60 according to the detection result of the first gaseous ammonia detection unit 40. Therefore, even if ammonia leaks inside the housing 20, the ammonia inside the housing 20 can be efficiently removed.

[0049] The ammonia exhaust system 1 comprises an ammonia device 10 that utilizes liquid ammonia, a housing 20 that houses the ammonia device 10, and a first gaseous ammonia detection unit 40 that detects gaseous ammonia leaking from the ammonia device 10 into the housing 20. The ammonia exhaust system 1 also comprises an exhaust passage 60 that exhausts the gas inside the housing 20 with an exhaust fan 61, and a control unit 90 that controls the operation of the exhaust fan 61 when gaseous ammonia is detected by the first gaseous ammonia detection unit 40.

[0050] The ammonia exhaust method includes a first gaseous ammonia detection step, which detects gaseous ammonia leaking from an ammonia equipment 10 that uses liquid ammonia and is housed within the housing 20. When gaseous ammonia is detected, the ammonia exhaust method includes an exhaust step, which exhausts the gas inside the housing 20 by controlling the drive of an exhaust fan 61.

[0051] According to the ammonia exhaust system 1 and ammonia exhaust method of this embodiment, even if ammonia leaks inside the housing 20, the first gaseous ammonia detection unit 40 can detect the gaseous ammonia inside the housing 20. The exhaust passage 60 exhausts the gas inside the housing 20 according to the detection result of the first gaseous ammonia detection unit 40. Therefore, even if ammonia leaks inside the housing 20, the ammonia inside the housing 20 can be efficiently removed.

[0052] The ammonia exhaust system 1 may include an ammonia removal unit 70 for removing ammonia in the exhaust passage 60. The control unit 90 may control the ammonia removal unit 70 to remove ammonia in the exhaust passage 60 when gaseous ammonia is detected by the first gaseous ammonia detection unit 40. This configuration allows ammonia to be removed outside the housing 20. Therefore, there is no need to remove ammonia inside the housing 20. For example, if liquid ammonia leaks from the ammonia equipment 10, the vaporization of the liquid ammonia can be suppressed by heat exchange between the absorbent liquid used in the ammonia removal unit 70 and the liquid ammonia. Thus, the diffusion of gaseous ammonia inside the housing 20 and the spread of damage caused by ammonia can be suppressed.

[0053] The ammonia exhaust system 1 is housed within a housing 20 and may include a containment dike 30 for storing liquid ammonia leaked from the ammonia equipment 10. This configuration helps to prevent leaked ammonia from spreading at the bottom of the housing 20 or leaking outside the housing 20.

[0054] Although several embodiments have been described, it is possible to modify or transform the embodiments based on the above disclosure. All components of the above embodiments, and all features described in the claims, may be taken individually and combined, provided that they do not conflict with each other.

[0055] This disclosure can contribute, for example, to United Nations Sustainable Development Goal (SDG) 7, "Ensure access to affordable, reliable, sustainable, and modern energy for all," and Goal 13, "Take urgent action to combat climate change and its impacts." [Explanation of Symbols]

[0056] 1. Ammonia exhaust system 10 Ammonia equipment 20 cabinets 30 Liquid dike 40. First gas ammonia detection unit (gas ammonia detection unit) 60 Exhaust passage 61 Exhaust fan 70 Harm abatement department 90 Control Unit

Claims

1. Ammonia equipment that uses liquid ammonia, A housing for the ammonia equipment, A gaseous ammonia detection unit for detecting gaseous ammonia leaking from the ammonia equipment inside the housing, An exhaust passage for exhausting gas from inside the enclosure, A detoxification unit for removing ammonia in the exhaust passage, A control unit controls the abolition unit to abolish ammonia in the exhaust passage when gaseous ammonia is detected by the gaseous ammonia detection unit, An ammonia exhaust system equipped with this system.

2. Ammonia equipment that uses liquid ammonia, A housing for the ammonia equipment, A gaseous ammonia detection unit for detecting gaseous ammonia leaking from the ammonia equipment inside the housing, An exhaust passage for exhausting the gas inside the enclosure with an exhaust fan, A control unit that controls the operation of the exhaust fan when gaseous ammonia is detected by the gaseous ammonia detection unit, An ammonia exhaust system equipped with this system.

3. The ammonia exhaust system includes a detoxification unit that detoxifies ammonia in the exhaust passage, The ammonia exhaust system according to claim 2, wherein the control unit controls the ammonia removal unit to remove ammonia in the exhaust passage when gaseous ammonia is detected by the gaseous ammonia detection unit.

4. The ammonia exhaust system according to claim 1 or 2, comprising a containment dike housed within the aforementioned enclosure for storing liquid ammonia leaked from the ammonia equipment.

5. A first gaseous ammonia detection step involves detecting gaseous ammonia leaking from an ammonia device housed within the enclosure that utilizes liquid ammonia, and An exhaust process in which the gas inside the enclosure is exhausted through an exhaust passage, A step of removing ammonia in the exhaust passage when the aforementioned gaseous ammonia is detected, A method for exhausting ammonia, including the method described above.

6. A first gaseous ammonia detection step involves detecting gaseous ammonia leaking from an ammonia device housed within the enclosure that utilizes liquid ammonia, and When the aforementioned gaseous ammonia is detected, an exhaust process is performed to exhaust the gas inside the housing by controlling the operation of the exhaust fan, A method for exhausting ammonia, including the method described above.

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