Ammonia recovery system and method

Abstract

To recover leaked ammonia gas immediately to suppress the ammonia gas from diffusing into the surroundings.SOLUTION: An ammonia recovery system comprises: a collection cover that covers a target location where ammonia gas can potentially leak, and has an air inflow port into which air flows from the outside; a collection gas line that connects the inside of the collection cover to ammonia treatment equipment including at least one of ammonia combustion equipment that burns ammonia gas and ammonia absorption equipment that absorbs ammonia gas into an absorption liquid, the collection gas line feeding the gas collected by the collection cover to the ammonia treatment equipment; and a fan that pressure-feeds the gas in the collection gas line to the ammonia treatment equipment regardless of the presence or absence of leakage of the ammonia gas.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a technique for recovering leaked ammonia gas. [Background technology]

[0002] BACKGROUND ART Conventionally, there are known techniques for preventing the diffusion of gas leaking from a connection portion of a pipe. Patent Document 1 discloses a leakage prevention device for a flange joint.

[0003] The leakage prevention device in Patent Document 1 recovers gas leaking from a flange joint of a pipe, and is composed of a recovery container that airtightly covers the joint of the flange joint, a detector that detects fluid leakage from the flange joint by pressure fluctuations inside the recovery container, and fluid treatment equipment connected to the recovery container, which is a condenser that liquefies gas. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 61-139737 Summary of the Invention [Problem to be solved by the invention]

[0005] Ammonia is attracting attention as a CO2-free fuel, and is expected to be used as fuel for thermal boilers. In the ammonia gas supply system to boilers, there are some parts where the possibility of leakage cannot be completely eliminated, such as pipe joints and valves. Even a very small amount of ammonia can cause an unpleasant odor and lead to poisoning, so it is desirable to immediately recover any leaked ammonia.

[0006] The present disclosure has been made in view of the above circumstances, and its purpose is to propose a technology for immediately recovering leaked ammonia gas and suppressing the diffusion of the ammonia gas into the surrounding area. [Means for solving the problem]

[0007] In order to solve the above problem, an ammonia recovery system according to one embodiment of the present disclosure includes: a collection cover having an air inlet through which air flows in from the outside and covering a target location from which ammonia gas may leak; ammonia treatment equipment including at least one of an ammonia combustion equipment that burns the ammonia gas and an ammonia absorption equipment that absorbs the ammonia gas into an absorption liquid, and a collected gas line that connects the inside of the collection cover to the ammonia treatment equipment, and sends the gas collected by the collection cover to the ammonia treatment equipment; and a fan that pressure-transfers the gas in the collected gas line to the ammonia treatment facility regardless of whether the ammonia gas is leaking.

[0008] Further, the ammonia recovery method according to one embodiment of the present disclosure includes: Covering the target area where ammonia gas may leak with a collection cover having an air inlet that allows air to flow in from the outside, The collection cover is connected to an ammonia treatment facility including at least one of an ammonia combustion facility that burns the ammonia gas and an ammonia absorption facility that absorbs the ammonia gas into an absorption liquid by a collection gas line; The gas collected by the collection cover is sent to the ammonia treatment facility by a fan that operates regardless of whether the ammonia gas is leaking or not. [Effects of the Invention]

[0009] According to the present disclosure, the leaked ammonia gas can be immediately recovered and the diffusion of the ammonia gas into the surrounding area can be suppressed. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic configuration diagram of an ammonia recovery system according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic configuration diagram of an ammonia recovery system according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] [First embodiment] Next, an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic configuration diagram of an ammonia recovery system 1 according to a first embodiment of the present disclosure. The ammonia recovery system 1 shown in Fig. 1 recovers ammonia gas leaked from an ammonia fuel supply system 2 that supplies ammonia gas to a boiler 10 as fuel, and treats the ammonia gas to remove harm.

[0012] The boiler 10 includes a furnace 14. A combustion chamber 15 in which fuel is burned is provided inside the furnace 14. A burner 11 is connected to the furnace wall of the furnace 14. The burner 11 is an ammonia-only or multi-fuel burner that uses ammonia gas as fuel. An ammonia fuel supply system 2 is connected to the burner 11. The ammonia fuel supply system 2 includes an ammonia gas source and a fuel pipe 20 that sends ammonia gas from the ammonia gas source to the burner 11.

[0013] The ammonia fuel supply system 2 is provided with an ammonia recovery system 1 that recovers ammonia that has leaked from the ammonia fuel supply system 2. The ammonia recovery system 1 includes a collection cover 31 that covers a target location 21 in the ammonia fuel supply system 2 from which ammonia gas may leak, an ammonia treatment facility 3 that treats the ammonia gas, a captured gas line 4 that sends the gas captured by the collection cover 31 to the ammonia treatment facility 3, and a fan 47 that pressure-feeds the gas in the captured gas line 4 to the ammonia treatment facility 3.

[0014] The target location 21 according to this embodiment is a pipe connection portion of the fuel pipe 20 of the ammonia fuel supply system 2. The collection cover 31 includes a side wall 32 that covers the target location 21 horizontally, and an upper wall 33 that closes the upper portion of the side wall 32. The side wall 32 extends in the vertical direction, and the lower end of the side wall 32 is located several centimeters below the lower end of the target location 21. The upper wall 33 is preferably conical, pyramidal, or dome-shaped, rising toward an outlet 34 to which the collection pipe 41 is connected. A part or all of the bottom of the collection cover 31 is open, forming an air inlet 35 through which air flows in from the surroundings.

[0015] The ammonia treatment facility 3 includes an ammonia combustion facility 3A that burns ammonia and an ammonia absorption facility 3B that absorbs ammonia with an absorption liquid. The ammonia treatment facility 3 may include at least one of the ammonia combustion facility 3A and the ammonia absorption facility 3B. The ammonia combustion facility 3A according to this embodiment is a boiler 10. The ammonia absorption facility 3B according to this embodiment is an ammonia detoxification tank 45.

[0016] In the ammonia recovery system 1 according to this embodiment, the gas captured by the collection cover 31 is used as seal air in the boiler 10. Therefore, the captured gas line 4 is configured to send the gas captured by the collection cover 31 to a seal air nozzle 12 provided on the furnace wall of the furnace 14 of the boiler 10. The seal air nozzle 12 sprays high-pressure seal air from around a furnace wall penetration. The seal air sprayed from the seal air nozzle 12 into the combustion chamber 15 prevents gas leakage from the combustion chamber 15 through the furnace wall penetration. Non-limiting examples of the furnace wall penetration include a sight glass, a penetration for various sensors, a penetration for piping, a penetration for a burner, etc.

[0017] The captured gas line 4 includes a collection pipe 41 connected to the collection cover 31, a main pipe 42 to which one or more collection pipes 41 are connected, and a seal air pipe 44 connecting the main pipe 42 and the seal air nozzle 12. A fan 47 is interposed between the main pipe 42 and the seal air pipe 44, an air inlet 47a of the fan 47 is connected to the main pipe 42, and the seal air pipe 44 is connected to an air outlet 47b of the fan 47. The fan 47 compresses the gas sucked in through the air inlet 47a and blows the compressed gas out through the air outlet 47b. The fan 47 operates constantly, regardless of whether the boiler 10 is operating or stopped, and regardless of whether ammonia gas is leaking.

[0018] A discharge pipe 43 is connected to the seal air pipe 44. An ammonia detoxification tank 45 serving as ammonia absorption equipment 3B is connected to the downstream end of the discharge pipe 43. The ammonia detoxification tank 45 removes ammonia components from ammonia-containing gas and releases the gas from which the ammonia components have been removed into the atmosphere. The ammonia detoxification tank 45 according to this embodiment is a container that stores an absorption liquid that absorbs ammonia, and a blowing nozzle 46 connected to the discharge pipe 43 is disposed at the bottom of the container. The blowing nozzle 46 has one or more gas outlets that blow the gas sent through the discharge pipe 43 into the absorption liquid.

[0019] The captured gas line 4 has a switching device 40 that switches the destination of the gas captured by the capture cover 31 between a boiler 10 serving as ammonia combustion equipment 3A and an ammonia detoxification tank 45 serving as ammonia absorption equipment 3B. The switching device 40 includes a first valve 48, a second valve 49, and a control device 5 that controls the operation of the first valve 48 and the second valve 49. The first valve 48 is disposed downstream of the connection between the seal air pipe 44 and the discharge pipe 43 and opens and closes the flow path of the seal air pipe 44. The second valve 49 is disposed in the discharge pipe 43 and opens and closes the flow path of the discharge pipe 43. The first valve 48 and the second valve 49 are electrically connected to the control device 5. The control device 5 operates the first valve 48 and the second valve 49 depending on the operating status of the boiler 10.

[0020] The control device 5 is also electrically connected to an ammonia sensor 59 that detects ammonia. The ammonia sensor 59 is connected to a portion of the main pipe 42 immediately upstream of the intake port 47a of the fan 47, and detects the presence or absence of ammonia or the ammonia concentration in the gas that flows into the seal air pipe 44 via the fan 47. The control device 5 is configured to output an ammonia leak to an alarm or the like when ammonia is detected by the ammonia sensor 59.

[0021] <<Ammonia recovery method>> Here, a description will be given of an ammonia recovery method using the above-configured ammonia recovery system 1. Although not specifically stated below, the operations of the first valve 48 and the second valve 49 are controlled by the control device 5.

[0022] When seal air is required, such as during boiler 10 warm-up, operation, and cool-down, the first valve 48 is opened and the second valve 49 is closed. Operation of the fan 47 generates a suction force at the outlet 34 of the collection cover 31 that forcibly discharges gas inside the collection cover 31 into the collection tube 41, creating a gas flow inside the collection cover 31 toward the outlet 34. Air flowing in from the air inlet 35 is present inside the collection cover 31. Furthermore, if ammonia gas leaks from the target location 21, the leaked ammonia gas will be present inside the collection cover 31 in addition to the air. Because ammonia gas has a lower density than air, the leaked ammonia gas will preferentially rise inside the collection cover 31 and move toward the outlet 34 of the collection cover 31. Additionally, as described above, a forced gas flow toward the outlet 34 is generated inside the collection cover 31. As a result, although the air inlet 35 is open in the collection cover 31, the ammonia gas leaking into the collection cover 31 is prevented from diffusing outside the collection cover 31.

[0023] The gas collected by the collection cover 31 is a mixture of ammonia gas and air when ammonia gas leakage occurs, and is air when ammonia gas leakage does not occur. The gas collected by the collection cover 31 flows from the outlet 34 of the collection cover 31 into the collection pipe 41, and is sucked into the intake port 47a of the fan 47 through the collection pipe 41 and the main pipe 42. The fan 47 pressurizes the sucked gas and blows it out into the seal air pipe 44. The pressurized gas passes through the seal air pipe 44 and is ejected from the seal air nozzle 12 into the combustion chamber 15.

[0024] When ammonia gas is contained in the seal air injected from the seal air nozzle 12 into the combustion chamber 15, the ammonia gas is burned in the combustion chamber 15. In this way, the ammonia gas leaking from the ammonia fuel supply system 2 is used as part of the fuel in the boiler 10. In order to enable combustion of the ammonia gas, it is preferable that the seal air nozzle 12 is arranged so that the ammonia gas is injected into the flow of high-temperature combustion gas generated by the combustion of the fuel injected from the burner 11.

[0025] When seal air is not required in the boiler 10, the first valve 48 is closed and the second valve 49 is open. When the fan 47 is operated, the gas collected in the collection cover 31 flows into the collection pipe 41 and is sucked from the collection pipe 41 through the main pipe 42 into the intake port 47a of the fan 47. The fan 47 pressurizes the sucked gas and blows it out into the seal air pipe 44. The pressurized gas is sent to the ammonia detoxification tank 45 through a part of the seal air pipe 44 and the discharge pipe 43, and is blown out into the absorption liquid from the blowing nozzle 46. The gas rises through the absorption liquid and is discharged from the ammonia detoxification tank 45 to the outside.

[0026] If the gas injected into the absorbing solution from the injection nozzle 46 contains leaked ammonia gas, the ammonia component in the gas is absorbed into the absorbing solution as the gas (i.e., a mixture of ammonia gas and air) rises through the absorbing solution. The gas thus detoxified by removing the ammonia is released to the outside from the ammonia detoxification tank 45.

[0027] Second Embodiment Next, a second embodiment will be described. Fig. 2 is a schematic configuration diagram of an ammonia recovery system 1 according to a second embodiment of the present disclosure. In the description of this embodiment, components that are the same as or similar to those in the above-described embodiment are given the same reference numerals in the drawings, and description thereof will be omitted. The ammonia recovery system 1 shown in Fig. 2 recovers ammonia gas that has leaked in a building 6 that houses a boiler 10, and treats the ammonia gas to detoxify it.

[0028] The ammonia recovery system 1 includes a collection cover 31 that covers a target location 21 where ammonia gas may leak, an ammonia treatment facility 3 that treats the ammonia gas, a collected gas line 4 that sends the gas collected by the collection cover 31 to the ammonia treatment facility 3, and a fan 47 that pressurizes the gas in the collected gas line 4 to the ammonia treatment facility 3. The fan 47 operates constantly regardless of whether ammonia gas is leaking or not.

[0029] The building 6 that houses the boiler 10 includes a side wall 61 that covers the boiler 10 horizontally, and a collection cover 31 that closes the upper part of the side wall 61. The collection cover 31 forms the roof of the building 6. Within this building 6, there are multiple target locations 21 from which ammonia gas may leak. Examples of target locations 21 include the connection between the fuel pipe 20 and the burner 11, the furnace wall penetration part of the burner 11, and the pipe connection part of the fuel pipe 20. The collection cover 31 collectively covers the upper parts of the multiple target locations 21 within the building 6.

[0030] The ammonia treatment facility 3 includes an ammonia combustion facility 3A that burns ammonia and an ammonia absorption facility 3B that absorbs ammonia with an absorption liquid. The ammonia combustion facility 3A according to this embodiment is a boiler 10. The ammonia absorption facility 3B according to this embodiment is an ammonia detoxification tank 45.

[0031] In the ammonia recovery system 1 according to this embodiment, the gas captured by the collection cover 31 is used as seal air in the boiler 10. For this reason, the captured gas line 4 is configured to send the gas captured by the collection cover 31 to a seal air nozzle 12 provided on the furnace wall of the furnace 14 of the boiler 10. The captured gas line 4 branches downstream of the fan 47 into a flow path that sends gas to the seal air nozzle 12 of the boiler 10 and a flow path that sends gas to an ammonia detoxification tank 45. The captured gas line 4 is provided with a switching device 40 that switches the destination of the gas captured by the collection cover 31 between the seal air nozzle 12 of the boiler 10 and the ammonia detoxification tank 45.

[0032] In the ammonia recovery system 1 configured as described above, when an ammonia gas leak occurs at the target location 21 in the building 6, the leaked ammonia gas rises within the building 6 and collects in the collection cover 31 that forms the upper part of the building 6. When the fan 47 is operated, a suction force is generated at the outlet 34 of the collection cover 31 that draws the gas within the collection cover 31 into the collection pipe 41, and the ammonia gas collected in the collection cover 31 flows out into the collection pipe 41 together with the air within the building 6. When the first valve 48 is open and the second valve 49 is closed, the mixed gas of ammonia gas and air is sent to the seal air nozzle 12 through the collected gas line 4 (i.e., the collection pipe 41, the main pipe 42, and the seal air pipe 44) and is sprayed from the seal air nozzle 12 into the combustion chamber 15. The ammonia gas contained in the gas sprayed into the combustion chamber 15 is combusted in the combustion chamber 15. When the first valve 48 is closed and the second valve 49 is open, the mixed gas of ammonia gas and air is sent to the ammonia detoxification tank 45 through the collected gas line 4 (i.e., the collection pipe 41, the main pipe 42, the seal air pipe 44, and the discharge pipe 43). The mixed gas injected into the absorption liquid in the ammonia detoxification tank 45 rises through the absorption liquid, and the ammonia component in the mixed gas is absorbed by the absorption liquid. The gas that has been detoxified by removing the ammonia is discharged from the ammonia detoxification tank 45 to the outside.

[0033] In the first and second embodiments described above, the gas collected by the collection cover 31 is used as seal air in the boiler 10. However, the method of using the gas collected by the collection cover 31 is not limited to seal air. For example, the gas collected by the collection cover 31 is used as cooling gas in the boiler 10 serving as the ammonia combustion facility 3A. In this case, in the ammonia recovery system 1 according to the first and second embodiments described above, a cooling gas pipe is used instead of the seal air pipe 44, and a cooling gas nozzle is used instead of the seal air nozzle 12. Also, for example, the gas collected by the collection cover 31 is used as part of the combustion air in the boiler 10 serving as the ammonia combustion facility 3A. In this case, in the ammonia recovery system 1 according to the first and second embodiments described above, a combustion air supply pipe is used instead of the seal air pipe 44, and a combustion air nozzle is used instead of the seal air nozzle 12. The combustion air nozzle is positioned so as to inject the gas captured by the collection cover 31 downstream of the flow of combustion gas from the burner 11 of the boiler 10. Even when the gas captured by the collection cover 31 as described above is used as cooling gas or combustion air, the gas is combusted in the combustion chamber 15 of the boiler 10.

[0034] [Summary] The ammonia recovery system 1 according to the first aspect of the present disclosure includes: a collection cover 31 having an air inlet 35 through which air flows in from the outside and covering a target location 21 from which ammonia gas may leak; ammonia treatment equipment 3 including at least one of ammonia combustion equipment 3A for burning ammonia gas and ammonia absorption equipment 3B for absorbing ammonia gas into an absorption liquid, and a captured gas line 4 connecting the inside of the capture cover 31 to the capture cover 31, and sending the gas captured by the capture cover 31 to the ammonia treatment equipment 3; and a fan 47 that pressure-transfers the gas in the collected gas line 4 to the ammonia treatment facility 3 regardless of whether or not there is a leakage of ammonia gas.

[0035] According to the ammonia recovery system 1 configured as described above, when there is no ammonia gas leakage at the target location 21, the gas (i.e., air) captured by the collection cover 31 is sent to the ammonia treatment facility 3 by the fan 47, which operates at all times. When an ammonia gas leak occurs at the target location 21, the leaked ammonia gas is captured by the collection cover 31 and sent to the ammonia treatment facility 3. The fan 47 operates at all times regardless of whether there is an ammonia gas leak or not, and is not activated when an ammonia gas leak is detected. Therefore, when an ammonia gas leak occurs, the ammonia gas is immediately captured by the collection cover 31 without any time lag, and the diffusion of the ammonia gas to the surrounding area is suppressed.

[0036] The ammonia recovery system 1 according to the second aspect of the present disclosure is the ammonia recovery system 1 according to the first aspect, wherein the ammonia treatment facility 3 includes both an ammonia combustion facility 3A and an ammonia absorption facility 3B, and the captured gas line 4 has a switching device 40 that switches the destination of the gas captured by the capture cover 31 between the ammonia combustion facility 3A and the ammonia absorption facility 3B.

[0037] According to the ammonia recovery system 1 configured as described above, it is possible to arbitrarily select whether to treat leaked ammonia gas in the ammonia combustion facility 3A or the ammonia absorption facility 3B. Furthermore, when there is no leakage of ammonia gas, the gas collected by the collection cover 31 can be used in the ammonia combustion facility 3A.

[0038] The ammonia recovery system 1 according to the third item of the present disclosure is the ammonia recovery system 1 according to the first or second item, in which the collection cover 31 has a side wall 32 that covers the target location 21 horizontally and an upper wall 33 that closes the upper part of the side wall 32, and an air inlet 35 opens at the bottom of the collection cover 31.

[0039] According to the ammonia recovery system 1 configured as described above, since ammonia gas has a lower density than air, leaked ammonia gas rises within the collection cover 31 in preference to air, and the outflow of ammonia gas from the air inlet 35 at the bottom of the collection cover 31 is suppressed.

[0040] The ammonia recovery system 1 according to the fourth item of the present disclosure is the ammonia recovery system 1 according to the first or second item, in which the collection cover 31 forms the roof portion of the building 6 that houses the ammonia combustion equipment 3A.

[0041] According to the ammonia recovery system 1 configured as described above, a single collection cover 31 can cover multiple target locations 21 within the building 6 collectively, and the collection cover 31 can capture leaked ammonia gas generated in the building 6.

[0042] The ammonia recovery system 1 according to the fifth item of the present disclosure is the ammonia recovery system 1 according to any one of the first to fourth items, wherein the collected gas line 4 includes a main pipe 42 connected to the intake port 47a of the fan 47, a collection pipe 41 connecting the main pipe 42 and the collection cover 31, and an ammonia sensor 59 arranged in the main pipe 42 to detect ammonia.

[0043] According to the ammonia recovery system 1 configured as described above, the number of ammonia sensors 59 installed can be reduced compared to when an ammonia sensor 59 is provided for each collection pipe 41, and the cost associated with the ammonia sensors 59 can be reduced.

[0044] An ammonia recovery system 1 according to a sixth item of the present disclosure is the ammonia recovery system 1 according to any one of the first to fifth items, wherein the captured gas line 4 includes a seal air pipe 44 that sends the gas captured by the capture cover 31 to the ammonia combustion equipment 3A as seal air, and the fan 47 is a seal air fan that pressurizes and delivers the seal air.

[0045] According to the ammonia recovery system 1 having the above configuration, the gas collected by the collection cover 31 can be effectively used as seal air regardless of whether ammonia gas leaks or not. Furthermore, when ammonia gas is contained in the gas injected as seal air into the combustion chamber 15 of the ammonia combustion equipment 3A, the ammonia gas can be effectively used as fuel.

[0046] An ammonia recovery system 1 according to a seventh item of the present disclosure is an ammonia recovery system 1 according to any one of the first to fifth items, in which the captured gas line 4 includes a cooling gas pipe 44 that sends the gas captured by the capture cover 31 to the ammonia combustion equipment 3A as a cooling gas.

[0047] According to the ammonia recovery system 1 having the above configuration, regardless of whether ammonia gas leaks or not, the gas collected by the collection cover 31 can be effectively used as a cooling gas. Furthermore, when ammonia gas is contained in the gas injected into the combustion chamber 15 of the ammonia combustion equipment 3A as a cooling gas, the ammonia gas can be effectively used as a fuel.

[0048] An ammonia recovery system 1 according to an eighth item of the present disclosure is the ammonia recovery system 1 according to any one of the first to fifth items, wherein the captured gas line 4 includes a combustion air supply pipe 44 that sends the gas captured by the capture cover 31 as combustion air downstream of the flow of combustion gas from the burner 11 of the ammonia combustion equipment 3A.

[0049] According to the ammonia recovery system 1 having the above configuration, regardless of whether ammonia gas leaks or not, the gas collected by the collection cover 31 can be effectively used as combustion air. Furthermore, when ammonia gas is contained in the gas injected as combustion air into the combustion chamber 15 of the ammonia combustion equipment 3A, the ammonia gas can be effectively used as fuel.

[0050] The ammonia recovery method according to the ninth aspect of the present disclosure comprises: The target location 21 where there is a possibility of ammonia gas leakage is covered with a collection cover 31 having an air inlet 35 that allows air to flow in from the outside, The collection cover 31 is connected to an ammonia treatment facility 3 including at least one of an ammonia combustion facility 3A that burns ammonia gas and an ammonia absorption facility 3B that absorbs the ammonia gas into an absorption liquid by a collection gas line 4; This includes sending the gas collected by the collection cover 31 to the ammonia treatment facility 3 by the fan 47 which is in operation regardless of whether or not there is ammonia gas leakage.

[0051] According to the above-described ammonia recovery method, when there is no ammonia gas leakage at target location 21, the gas (i.e., air) captured by collection cover 31 is sent to ammonia treatment facility 3 by fan 47, which is always in operation. When ammonia gas leakage occurs at target location 21, the leaked ammonia gas is captured by collection cover 31 and sent to ammonia treatment facility 3. Fan 47 is always in operation regardless of whether there is ammonia gas leakage or not, and is not activated when an ammonia gas leakage is detected. Therefore, when ammonia gas leakage occurs, the ammonia gas is immediately captured by collection cover 31 without any time lag, and the diffusion of ammonia gas to the surrounding area is suppressed.

[0052] The functions of the control device 5 disclosed herein can be performed using circuits or processing circuits, including general-purpose processors, special-purpose processors, integrated circuits, ASICs (Application Specific Integrated Circuits), conventional circuits, and / or combinations thereof, configured or programmed to perform the disclosed functions. A processor is considered a processing circuit or circuitry because it includes transistors and other circuitry. In this disclosure, a circuit, unit, or means is hardware that performs the recited functions. The hardware may be hardware disclosed herein or other known hardware that is programmed or configured to perform the recited functions. Where the hardware is a processor, which is considered a type of circuit, the circuit, means, or unit is a combination of hardware and software, and the software is used to configure the hardware and / or processor.

[0053] The foregoing discussion of the present disclosure has been presented for purposes of illustration and description and is not intended to limit the present disclosure to the form disclosed herein. For example, in the foregoing detailed description, various features of the present disclosure are grouped together in a single embodiment for the purpose of streamlining the disclosure, but some of the features may also be combined. Furthermore, the features included in the present disclosure may also be combined into alternative embodiments, configurations, or aspects other than those discussed above. [Explanation of symbols]

[0054] 1: Ammonia recovery system 2: Ammonia fuel supply system 3: Ammonia treatment facility 3A: Ammonia combustion equipment 3B: Ammonia absorption facility 4: Collecting gas line 5: Control device 6: Building 10: Boiler 11: Burner 15: Combustion chamber 21: Target area 31: Collection cover 32: Side wall 33: Upper wall 34:Exit 35: Air inlet 40: Switching device 41: Collection tube 42: Main pipe 44: Seal air pipe (cooling gas pipe, combustion air supply pipe) 45: Ammonia detoxification tank 47: Fan 47a: Air intake 47b: Air outlet 48: First valve (switching device) 49: Second valve (switching device) 59: Ammonia sensor

Claims

1. a collection cover having an air inlet through which air flows in from the outside and covering a target location from which ammonia gas may leak; ammonia treatment equipment including at least one of an ammonia combustion equipment that combusts the ammonia gas and an ammonia absorption equipment that absorbs the ammonia gas in an absorption liquid, and a collected gas line that connects the inside of the collection cover to the ammonia treatment equipment, and sends the gas collected by the collection cover to the ammonia treatment equipment; a fan that pressure-transfers the gas in the collected gas line to the ammonia treatment facility regardless of whether the ammonia gas is leaking. Ammonia recovery system.

2. the ammonia processing facility includes both the ammonia combustion facility and the ammonia absorption facility; The captured gas line has a switching device that switches the destination of the gas captured by the capture cover between the ammonia combustion facility and the ammonia absorption facility.

10. The ammonia recovery system of claim 1.

3. The collection cover has a side wall that covers the target location from a horizontal direction and an upper wall that closes an upper portion of the side wall, and the air inlet is opened at the bottom of the collection cover.

10. The ammonia recovery system of claim 1.

4. 2. The ammonia recovery system according to claim 1, wherein the collection cover forms a roof portion of a building that houses the ammonia combustion facility.

5. the collected gas line includes a main pipe connected to an intake port of the fan, a collection pipe connecting the main pipe and the collection cover, and an ammonia sensor disposed in the main pipe for detecting ammonia.

10. The ammonia recovery system of claim 1.

6. the trapped gas line includes a seal air pipe that sends the gas trapped by the trapping cover to the ammonia combustion facility as seal air, and the fan is a seal air fan that pressurizes and delivers the seal air.

10. The ammonia recovery system of claim 1.

7. The collected gas line includes a cooling gas pipe that sends the gas collected by the collection cover to the ammonia combustion facility as a cooling gas.

10. The ammonia recovery system of claim 1.

8. the collected gas line includes a combustion air supply pipe that sends the gas collected by the collection cover as combustion air downstream of the flow of combustion gas from a burner of the ammonia combustion equipment, 10. The ammonia recovery system of claim 1.

9. Covering the target area where ammonia gas may leak with a collection cover having an air inlet that allows air to flow in from the outside, The collection cover is connected to an ammonia treatment facility including at least one of an ammonia combustion facility that combusts the ammonia gas and an ammonia absorption facility that absorbs the ammonia gas into an absorption liquid by a collection gas line; Sending the gas collected by the collection cover to the ammonia treatment facility by a fan that operates regardless of whether the ammonia gas is leaking. Ammonia recovery method.

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