Recovery device

Abstract

A recovery device 1 comprises: a first tank 11 connected to a first conduit VL6 to which ammonia gas F1 is supplied, the first tank 11 storing ammonia in two phases including a gas phase and a liquid phase; and a second conduit 12 that passes through the interior of the first tank 11 and accommodates the cooling fluid, the cooling fluid having a temperature lower than the temperature of the ammonia gas supplied from the first conduit VL6.

Description

Recovery device

[0001] This application claims the benefit of priority from Japanese Patent Application No. 2024-90528, filed on Jun. 4, 2024, the contents of which are incorporated herein by reference.

[0002] Ammonia is used in various facilities. For example, Patent Document 1 discloses a ship that uses ammonia as fuel. The ship is equipped with an ammonia abatement device. The ammonia abatement device includes an absorption tank. The absorption tank stores an absorption liquid such as seawater or fresh water. The absorption liquid absorbs the purged ammonia. Some of the ammonia in the absorption liquid gradually evaporates, and gas having a low ammonia concentration is released into the atmosphere.

[0003] Japanese Patent Application Laid-Open No. 2023-34573

[0004] Unused ammonia, as in Patent Document 1, leads to cost waste. Therefore, it is desirable to recover ammonia so that it can be reused.

[0005] An object of the present disclosure is to provide a recovery device that can recover ammonia so that it can be reused.

[0006] A recovery apparatus according to one aspect of the present disclosure includes a first tank connected to a first conduit through which gaseous ammonia is supplied, the first tank storing the ammonia in two phases including a gas phase and a liquid phase, and a second conduit passing through the first tank and containing a cooling fluid, the cooling fluid having a temperature lower than that of the gaseous ammonia supplied from the first conduit.

[0007] The first tank may receive gaseous ammonia from the first conduit in response to a pressure differential between an internal pressure of the first conduit and an internal pressure of the first tank.

[0008] The recovery device may further include a pressure sensor that measures the internal pressure of the first tank and a flow control valve that adjusts the flow rate of the cooling fluid flowing through the second conduit, and the flow rate of the cooling fluid may be adjusted based on the pressure measured by the pressure sensor.

[0009] The recovery device may further comprise a second tank circulatingly connected to the second conduit and configured to store the cooling fluid.

[0010] According to the present disclosure, ammonia can be recovered so that it can be reused.

[0011] Fig. 1 is a schematic diagram of a system including a recovery device according to a first embodiment, Fig. 2 is a schematic diagram of a system including a recovery device according to a second embodiment, and Fig. 3 is a schematic diagram of a system including a recovery device according to a third embodiment.

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Specific dimensions, materials, numerical values, etc. shown in the embodiments are merely examples for ease of understanding and do not limit the present disclosure unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present disclosure are not shown.

[0013] 1 is a schematic diagram of a system 100 including a recovery apparatus 1 according to a first embodiment. For example, in this embodiment, the recovery apparatus 1 is applied to a system 100 including a gas turbine 50. In other embodiments, the recovery apparatus 1 may be applied to equipment other than the gas turbine 50. For example, the recovery apparatus 1 is applicable to various known systems including an ammonia abatement apparatus, and can be used in place of the ammonia abatement apparatus.

[0014] For example, the system 100 includes a gas turbine 50, a recovery device 1, a fuel tank 2, a vaporizer 3, and a control device 90. The system 100 may further include other components.

[0015] The gas turbine 50 includes a compressor 51, a combustor 52, a turbine 53, and a shaft 54 ​​that connects the compressor 51 to the turbine 53. The gas turbine 50 may also include other components.

[0016] The compressor 51 compresses the intake air, which may be, for example, ambient air around the compressor 51. The compressed air is supplied to the combustor 52.

[0017] In this embodiment, the combustor 52 is connected to a first fuel conduit L1 and a second fuel conduit L2. The first fuel conduit L1 supplies a first fuel F1 to the combustor 52. The second fuel conduit L2 supplies a second fuel F2 to the combustor 52. For example, in this embodiment, the first fuel F1 is ammonia (gaseous ammonia), and the second fuel F2 is a fossil fuel such as natural gas. In this embodiment, the combustor 52 combusts a mixed gas including the first fuel F1 from the first fuel conduit L1, the second fuel F2 from the second fuel conduit L2, and air from the compressor 51. In other embodiments, the combustor 52 may exclusively combust ammonia.

[0018] The combustion gas from the combustor 52 is supplied to the turbine 53. As the combustion gas passes through an impeller in the turbine 53, it rotates the impeller together with the shaft 54. The shaft 54 ​​is connected to a generator G, and the rotational force of the shaft 54 ​​is used to generate electricity. In other embodiments, the rotational force of the shaft 54 ​​may be used in other devices. Furthermore, the rotational force of the shaft 54 ​​may be used to compress air in the compressor 51. For example, the exhaust gas from the turbine 53 may be supplied to equipment (not shown), such as a heat recovery boiler.

[0019] In this embodiment, the first fuel conduit L1 is connected to a fuel tank (ammonia supply source) 2. In this embodiment, the fuel tank 2 stores liquid ammonia F0. The fuel tank 2 is provided with a safety valve SV1 for releasing excess pressure of ammonia vaporized inside the fuel tank 2. In this embodiment, a seventh vent pipe VL7 extends from the safety valve SV1. The vaporized ammonia flows from the safety valve SV1 to the seventh vent pipe VL7. The ammonia supply source is not limited to the fuel tank 2. For example, in other embodiments, an ammonia manufacturing apparatus may be used as the ammonia supply source.

[0020] A first pump P1 for feeding liquid ammonia F0 is provided in the first fuel conduit L1. The first pump P1 is communicably connected to the control device 90 by wire or wirelessly, and is controlled by the control device 90.

[0021] The first fuel conduit L1 is provided with a vaporizer 3. The vaporizer 3 heats the liquid ammonia F0 from the fuel tank 2 to gaseous ammonia F1. For example, the vaporizer 3 may use a fluid such as steam generated in a heat recovery boiler as a heat medium. The heat medium used in the vaporizer 3 is not limited to this. The gaseous ammonia F1 is supplied from the vaporizer 3 to the combustor 52 via the first fuel conduit L1. Note that if a portion of the liquid ammonia F0 is not vaporized in the vaporizer 3, the gaseous ammonia F1 may contain liquid ammonia.

[0022] A first vent pipe VL1 is connected to the first fuel conduit L1 between the first pump P1 and the vaporizer 3. In this embodiment, the first vent pipe VL1 is connected to a safety valve SV2. Excess pressure of ammonia vaporized inside the first fuel conduit L1 is released by the safety valve SV2. Also, excess liquid ammonia in the first fuel conduit L1 may be released by the safety valve SV2. In this embodiment, a fourth vent pipe VL4 extends from the safety valve SV2. Ammonia flows from the safety valve SV2 to the fourth vent pipe VL4.

[0023] A second vent pipe VL2 is connected to the first fuel conduit L1 between the first vent pipe VL1 and the carburetor 3. In this embodiment, the second vent pipe VL2 and the fourth vent pipe VL4 merge into a third vent pipe VL3.

[0024] The third vent pipe VL3 is connected to the recovery device 1. The third vent pipe VL3 is configured to send the liquid ammonia F0 to the recovery device 1. The recovery device 1 will be described in detail later. In another embodiment, the third vent pipe VL3 may be connected to the fuel tank 2 instead of the recovery device 1.

[0025] The second vent pipe VL2 is provided with a first valve V1. The first valve V1 opens and closes the second vent pipe VL2. The first valve V1 is connected to the control device 90 via wire or wireless communication and is controlled by the control device 90.

[0026] A second valve V2 is provided in the first fuel conduit L1. The second valve V2 is provided in the first fuel conduit L1 between the vaporizer 3 and the combustor 52. The second valve V2 opens and closes the first fuel conduit L1. The second valve V2 is connected to the control device 90 so as to be able to communicate with the control device 90 via wire or wirelessly, and is controlled by the control device 90.

[0027] A third valve V3 is provided in the first fuel conduit L1. The third valve V3 is provided in the first fuel conduit L1 between the second valve V2 and the combustor 52. The third valve V3 opens and closes the first fuel conduit L1. The third valve V3 is connected to the control device 90 so as to be able to communicate with the control device 90 via wire or wirelessly, and is controlled by the control device 90.

[0028] A fifth vent pipe VL5 is connected to the first fuel conduit L1 between the carburetor 3 and the second valve V2. In this embodiment, the fifth vent pipe VL5 and the seventh vent pipe VL7 merge into a sixth vent pipe (first conduit) VL6.

[0029] The sixth vent pipe VL6 is connected to the recovery device 1. The sixth vent pipe VL6 is configured to send the gaseous ammonia F1 to the recovery device 1.

[0030] The fifth vent pipe VL5 is provided with a fourth valve V4. The fourth valve V4 opens and closes the fifth vent pipe VL5. The fourth valve V4 is connected to the control device 90 via wire or wireless communication and is controlled by the control device 90.

[0031] An eighth vent pipe VL8 is connected to the first fuel conduit L1 between the second valve V2 and the third valve V3. In this embodiment, the eighth vent pipe VL8 is connected to the sixth vent pipe VL6. The eighth vent pipe VL8 is configured to send the gaseous ammonia F1 to the recovery device 1 via the sixth vent pipe VL6.

[0032] The eighth vent pipe VL8 is provided with a fifth valve V5. The fifth valve V5 opens and closes the eighth vent pipe VL8. The fifth valve V5 is connected to the control device 90 via wire or wireless communication and is controlled by the control device 90.

[0033] A sixth valve V6 is provided in the sixth vent pipe VL6 before the recovery device 1, i.e., between the connection point of the eighth vent pipe VL8 and the recovery device 1. The sixth valve V6 opens and closes the sixth vent pipe VL6. The sixth valve V6 is connected to the control device 90 so as to be able to communicate with the control device 90 via wire or wirelessly, and is controlled by the control device 90.

[0034] The control device 90 controls the entire system 100 or at least a part of it. For example, the control device 90 may also control the collection device 1. For example, the control device 90 may be implemented by one or more computers. The control device 90 includes components such as a processor 90a, a storage device 90b, and a connector 90c, which are connected to each other via a bus. For example, the processor 90a includes a central processing unit (CPU). For example, the storage device 90b includes a hard disk, a read-only memory (ROM) for storing programs, and a random access memory (RAM) as a work area. The control device 90 is connected to each component of the system 100 and the collection device 1 via the connector 90c for wired or wireless communication. For example, the control device 90 may further include other components, such as a display device such as a liquid crystal display or a touch panel, and an input device such as a keyboard, buttons, or a touch panel. For example, the operation of the control device 90 may be realized by the processor 90a executing a program stored in the storage device 90b.

[0035] Next, the recovery device 1 will be described.

[0036] In this embodiment, the recovery device 1 is configured to recover gaseous ammonia F1 in the first fuel conduit L1. In addition, in this embodiment, the recovery device 1 is configured to recover liquid ammonia F0 in the first fuel conduit L1 in addition to the gaseous ammonia F1.

[0037] The recovery device 1 includes a recovery tank (first tank) 11, a cooling fluid conduit (second conduit) 12, a pressure sensor S1, and a flow rate control valve V7. The recovery device 1 may further include other components. Alternatively, the recovery device 1 may not include at least one of the above components.

[0038] The recovery tank 11 is connected to the third vent pipe VL3 and the sixth vent pipe VL6. The recovery tank 11 receives liquid ammonia F0 from the third vent pipe VL3 and receives gaseous ammonia F1 from the sixth vent pipe VL6.

[0039] The recovery tank 11 stores ammonia in two phases, including a gas phase and a liquid phase. Before gaseous ammonia F1 is recovered, liquid ammonia F0 is stored in the lower part of the recovery tank 11. For example, before gaseous ammonia F1 is received from the sixth vent pipe VL6, the amount of liquid ammonia F0 at the bottom of the recovery tank 11 may be small. The remaining area of ​​the recovery tank 11 contains gaseous ammonia F1.

[0040] The recovery tank 11 is connected to the fuel tank 2 by a return conduit L3.

[0041] The cooling fluid conduit 12 extends from the outside of the recovery tank 11 and passes through the inside of the recovery tank 11. The cooling fluid conduit 12 contains a cooling fluid. In this embodiment, a second pump P2 is provided in the cooling fluid conduit 12 for sending the cooling fluid. The cooling fluid flows inside the cooling fluid conduit 12. The second pump P2 may be communicatively connected to the control device 90 via wire or wirelessly and may be controlled by the control device 90.

[0042] The cooling fluid has a temperature lower than that of the gaseous ammonia F1 supplied from the sixth vent pipe VL6. For example, the cooling fluid may be seawater or water. The cooling fluid is not limited to these, and may be any fluid that can condense the gaseous ammonia F1 flowing into the recovery tank 11.

[0043] In the recovery tank 11, the temperature of the cooling fluid roughly corresponds to the saturation temperature of the ammonia in the recovery tank 11. Therefore, before receiving gaseous ammonia F1 from the sixth vent pipe VL6, the internal pressure of the recovery tank 11, i.e., the pressure of gaseous ammonia F1 in the recovery tank 11, is maintained roughly at the saturated vapor pressure corresponding to the temperature of the cooling fluid. The temperature of liquid ammonia F0 at the bottom of the recovery tank 11 roughly corresponds to the temperature of the cooling fluid.

[0044] For example, when the cooling fluid is seawater or water, the temperature of the cooling fluid is approximately 0°C to 30°C. The temperature of the cooling fluid is not limited to this. In this case, the internal pressure of the recovery tank 11 may be, for example, approximately 0.1 MPa to 1.0 MPa in gauge pressure. The internal pressure of the recovery tank 11 is not limited to this. In another embodiment, the internal pressure of the recovery tank 11 may be atmospheric pressure. In this case, the temperature of the liquid ammonia F0 at the bottom of the recovery tank 11 and the temperature of the cooling fluid are approximately -33°C. The temperatures of the liquid ammonia F0 and the cooling fluid are not limited to this. For example, the temperature of the gaseous ammonia F1 supplied from the sixth vent pipe VL6 is approximately 0°C to 400°C. The temperature of the gaseous ammonia F1 is not limited to this.

[0045] The pressure sensor S1 measures the internal pressure of the recovery tank 11, that is, the pressure of the gaseous ammonia F1 in the recovery tank 11.

[0046] The flow rate regulating valve V7 is provided in the cooling fluid conduit 12. The flow rate regulating valve V7 regulates the flow rate of the cooling fluid flowing through the cooling fluid conduit 12.

[0047] For example, the flow rate adjustment valve V7 may be communicatively connected to the pressure sensor S1 via a wire or wirelessly. The flow rate adjustment valve V7 may adjust the flow rate of the cooling fluid flowing through the cooling fluid conduit 12 so that the pressure measured by the pressure sensor S1 is maintained within a predetermined range. Alternatively, the pressure sensor S1 and the flow rate adjustment valve V7 may be communicatively connected to the control device 90 via a wire or wirelessly. For example, the control device 90 may control the flow rate adjustment valve V7 to adjust the flow rate of the cooling fluid flowing through the cooling fluid conduit 12 so that the pressure measured by the pressure sensor S1 is maintained within a predetermined range.

[0048] Next, the operation of the system 100 will be described.

[0049] A situation in which the gas turbine 50 operates normally will be described.

[0050] When the gas turbine 50 operates normally, the processor 90a of the control device 90 opens the second valve V2 and the third valve V3 and closes the first valve V1, the fourth valve V4, the fifth valve V5, and the sixth valve V6. The processor 90a operates the first pump P1 to supply liquid ammonia F0 from the fuel tank 2 to the vaporizer 3. The vaporizer 3 heats the liquid ammonia F0 to gaseous ammonia F1. The combustor 52 of the gas turbine 50 is supplied with gaseous ammonia (first fuel) F1 from the first fuel conduit L1 and the second fuel from the second fuel conduit L2. The combustor 52 combusts a mixed gas containing the gaseous ammonia F1, the second fuel F2, and air from the compressor 51. When the combustor 52 performs ammonia combustion, the combustor 52 combusts a mixed gas containing the gaseous ammonia F1 and the air from the compressor 51. In this manner, the gas turbine 50 operates.

[0051] During normal operation of the gas turbine 50, the second pump P2 of the recovery device 1 does not need to operate as long as the pressure measured by the pressure sensor S1 is maintained within a predetermined range. In this case, the flow control valve V7 is closed. Alternatively, during normal operation of the gas turbine 50, the second pump P2 may operate so that the pressure measured by the pressure sensor S1 is maintained within a predetermined range. In this case, the flow control valve V7 adjusts the flow rate of the cooling fluid through the cooling fluid conduit 12 so that the pressure measured by the pressure sensor S1 is maintained within the predetermined range.

[0052] The pressure measured by the pressure sensor S1, i.e., the internal pressure of the recovery tank 11, is set to be lower than the internal pressure of the first fuel conduit L1 during normal operation of the gas turbine 50. For example, the internal pressure of the recovery tank 11 may be lower than both the pressure of the gaseous ammonia F1 between the vaporizer 3 and the combustor 52 and the pressure of the liquid ammonia F0 between the first pump P1 and the vaporizer 3.

[0053] The situation in which the recovery device 1 recovers ammonia from the first fuel conduit L1 will be described.

[0054] For example, if the gas turbine 50 is to stop operating for some reason, the ammonia remaining in the first fuel conduit L1 must be removed to a safe level. In this case, the processor 90a closes the second valve V2 and the third valve V3 and opens the first valve V1, the fourth valve V4, the fifth valve V5, and the sixth valve V6. Furthermore, if the second pump P2 is not operating, the processor 90a starts operating the second pump P2.

[0055] As described above, the internal pressure of the recovery tank 11 is lower than the internal pressure of the first fuel conduit L1. Therefore, after the second valve V2 and the third valve V3 are closed and the fourth valve V4, the fifth valve V5, and the sixth valve V6 are opened, the internal pressure of the recovery tank 11 is lower than the internal pressures of the fifth vent pipe VL5, the sixth vent pipe VL6, and the eighth vent pipe VL8. With this configuration, in the first fuel conduit L1, the gaseous ammonia F1 between the vaporizer 3 and the second valve V2 and the gaseous ammonia F1 between the second valve V2 and the third valve V3 are sucked into the recovery tank 11 via the fifth vent pipe VL5, the sixth vent pipe VL6, and the eighth vent pipe VL8 due to the pressure difference between the internal pressure of the recovery tank 11 and the internal pressure of the sixth vent pipe VL6. Therefore, the amount of gaseous ammonia F1 inside the recovery tank 11 increases.

[0056] As described above, the pressure of the gaseous ammonia F1 in the recovery tank 11 is maintained approximately at the saturated vapor pressure corresponding to the temperature of the cooling fluid, so a portion of the gaseous ammonia F1 is cooled by the cooling fluid contained in the cooling fluid conduit 12 and condensed into liquid ammonia F0. The condensed liquid ammonia F0 is stored at the bottom of the recovery tank 11.

[0057] While receiving the gaseous ammonia F1 from the sixth vent pipe VL6, the flow rate adjustment valve V7 adjusts the flow rate of the cooling fluid based on the pressure measured by the pressure sensor S1. For example, the flow rate adjustment valve V7 may adjust its opening so that the pressure measured by the pressure sensor S1 becomes equal to the average value of the internal pressure of the recovery tank 11 over a predetermined period before receiving the gaseous ammonia F1. With this configuration, the pressure of the gaseous ammonia F1 in the recovery tank 11 can be maintained approximately at the saturated vapor pressure corresponding to the temperature of the cooling fluid.

[0058] According to the above configuration, the gaseous ammonia F1 in the first fuel conduit L1 is recovered by the recovery tank 11, and a portion of the gaseous ammonia F1 is stored as liquid ammonia F0. Therefore, the gaseous ammonia F1 in the first fuel conduit L1 can be recovered so as to be reusable.

[0059] Furthermore, in the first fuel conduit L1, the liquid ammonia F0 between the first pump P1 and the vaporizer 3 is sucked into the recovery tank 11 via the second vent pipe VL2 and the third vent pipe VL3 due to the pressure difference between the internal pressure of the recovery tank 11 and the internal pressure of that section of the first fuel conduit L1. The liquid ammonia F0 is stored at the bottom of the recovery tank 11. Therefore, the liquid ammonia F0 in the first fuel conduit L1 can be recovered so as to be reusable.

[0060] The liquid ammonia F0 in the recovery tank 11 is supplied to the fuel tank 2 through a return conduit L3. For example, the liquid ammonia F0 may be sent to the fuel tank 2 by a pressure difference between the internal pressure of the recovery tank 11 and the internal pressure of the fuel tank 2. Alternatively, a pump (not shown) for sending the liquid ammonia F0 to the fuel tank 2 may be provided in the return conduit L3.

[0061] For example, with the above-described configuration, it is not necessary to use a purge fluid. Therefore, for example, the gaseous ammonia F1 and liquid ammonia F0 recovered in the recovery tank 11 can be reused without being separated from other gases or liquids. Therefore, the cost of reuse can be reduced.

[0062] The recovery apparatus 1 described above includes a recovery tank 11 connected to a sixth vent pipe VL6 to which gaseous ammonia F1 is supplied, the recovery tank 11 storing ammonia in two phases, including a gas phase and a liquid phase, and a cooling fluid conduit 12 passing through the recovery tank 11 and containing a cooling fluid. The cooling fluid has a temperature lower than that of the gaseous ammonia F1 supplied from the sixth vent pipe VL6. With this configuration, the recovery tank 11 stores the gaseous ammonia F1 at a saturated vapor pressure corresponding to the temperature of the cooling fluid. When the gaseous ammonia F1 flows into the recovery tank 11 from the sixth vent pipe VL6 and the amount of gaseous ammonia F1 in the recovery tank 11 increases, the cooling fluid conduit 12 condenses a portion of the gaseous ammonia F1 with the cooling fluid. Therefore, the gaseous ammonia F1 can be recovered so as to be reusable.

[0063] Furthermore, in the recovery system 1, the recovery tank 11 receives gaseous ammonia F1 from the sixth vent pipe VL6 in accordance with the pressure difference between the internal pressure of the sixth vent pipe VL6 and the internal pressure of the recovery tank 11. Therefore, for example, a device such as a pump for sucking gaseous ammonia F1 is not required.

[0064] The recovery device 1 further includes a pressure sensor S1 that measures the internal pressure of the recovery tank 11, and a flow rate adjustment valve V7 that adjusts the flow rate of the cooling fluid flowing through the cooling fluid conduit 12, and the flow rate of the cooling fluid is adjusted based on the pressure measured by the pressure sensor S1. With this configuration, while the gaseous ammonia F1 is being received from the sixth vent pipe VL6, the pressure of the gaseous ammonia F1 inside the recovery tank 11 can be maintained approximately at the saturated vapor pressure that corresponds to the temperature of the cooling fluid.

[0065] Next, other embodiments will be described.

[0066] 2 is a schematic diagram of a system 100 including a recovery device 1A according to a second embodiment. The recovery device 1A differs from the recovery device 1 according to the first embodiment in that the recovery device 1A includes a cooling fluid tank (second tank) 13 instead of the second pump P2, pressure sensor S1, and flow rate adjustment valve V7. The recovery device 1A may otherwise be configured the same as the recovery device 1.

[0067] The cooling fluid tank 13 is circulatingly connected to the cooling fluid conduit 12. The cooling fluid tank 13 stores cooling fluid in two phases, including a gas phase and a liquid phase. For example, the cooling fluid tank 13 may include a cooling device (not shown) for cooling the cooling fluid. For example, the cooling device may be configured to maintain the temperature of the liquid cooling fluid within a predetermined range.

[0068] For example, when heat is input into the recovery tank 11 and the cooling fluid in the cooling fluid conduit 12 inside the recovery tank 11 is vaporized, the gaseous cooling fluid flows from the recovery tank 11 to the cooling fluid tank 13. Therefore, liquid cooling fluid flows from the cooling fluid tank 13 to the recovery tank 11, and the gaseous cooling fluid in the recovery tank 11 is replaced by the liquid cooling fluid. Therefore, the cooling fluid automatically circulates between the recovery tank 11 and the cooling fluid tank 13 depending on the temperature of the cooling fluid in the cooling fluid conduit 12 inside the recovery tank 11, i.e., the temperature of the gaseous ammonia F1 inside the recovery tank 11.

[0069] Such a recovery device 1A can achieve substantially the same effects as the recovery device 1 according to the first embodiment.

[0070] The recovery device 1A also includes a cooling fluid tank 13 that is circulatingly connected to the cooling fluid conduit 12 and stores the cooling fluid. With this configuration, the cooling fluid automatically circulates between the recovery tank 11 and the cooling fluid tank 13 depending on the temperature of the gaseous ammonia F1 in the recovery tank 11. Therefore, a pump for sending the cooling fluid is not required. This allows the cost of the recovery device 1A to be reduced.

[0071] Next, other embodiments will be described.

[0072] 3 is a schematic diagram of a system 100 including a recovery device 1B according to a third embodiment. The recovery device 1B differs from the recovery device 1 according to the first embodiment in that the recovery device 1B includes a temperature sensor S2 instead of the pressure sensor S1. The other configurations of the recovery device 1B may be the same as those of the recovery device 1.

[0073] For example, the temperature sensor S2 may be configured to measure the temperature of the liquid ammonia F0 in the recovery tank 11. For example, the flow rate adjustment valve V7 may be communicatively connected to the temperature sensor S2 by wire or wirelessly. The flow rate adjustment valve V7 may adjust the flow rate of the cooling fluid flowing through the cooling fluid conduit 12 so that the temperature measured by the temperature sensor S2 is maintained within a predetermined range. Alternatively, the temperature sensor S2 and the flow rate adjustment valve V7 may be communicatively connected to the control device 90 by wire or wirelessly. For example, the control device 90 may control the flow rate adjustment valve V7 to adjust the flow rate of the cooling fluid flowing through the cooling fluid conduit 12 so that the temperature measured by the temperature sensor S2 is maintained within a predetermined range. For example, the flow rate adjustment valve V7 may adjust the flow rate of the cooling fluid so that the temperature measured by the temperature sensor S2 is maintained within a predetermined range from the temperature of the liquid ammonia F0 before receiving the ammonia from the first fuel conduit L1.

[0074] Such a recovery device 1B can achieve substantially the same effects as the recovery device 1 according to the first embodiment.

[0075] Although the embodiments have been described above with reference to the accompanying drawings, the present disclosure is not limited to the above embodiments. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also fall within the technical scope of the present disclosure. Furthermore, the steps of the method of the above embodiments do not have to be performed in the order described above, and may be performed in a different order as long as no technical contradiction occurs.

[0076] For example, in the above embodiment, the recovery tank 11 is connected to the third vent pipe VL3 and receives liquid ammonia F. In other embodiments, the recovery tank 11 does not need to be connected to the third vent pipe VL3 and does not need to receive liquid ammonia F.

[0077] Furthermore, for example, in the above embodiment, the recovery tank 11 receives the gaseous ammonia F1 in accordance with the pressure difference between the internal pressure of the sixth vent pipe VL6 and the internal pressure of the recovery tank 11. In other embodiments, for example, a compressor (not shown) for sending the gaseous ammonia F1 to the recovery tank 11 may be provided in the sixth vent pipe VL6.

[0078] The present disclosure provides ２ It can promote the use of ammonia, which leads to reduced emissions, thereby contributing, for example, to Sustainable Development Goal (SDG) 7 "Ensure access to affordable, reliable, sustainable and modern energy" and SDG 13 "Take urgent action to combat climate change and its impacts".

[0079] 1 Recovery device 1A Recovery device 1B Recovery device 11 Recovery tank (first tank) 12 Cooling fluid conduit (second conduit) 13 Cooling fluid tank (second tank) F0 Liquid ammonia F1 Gaseous ammonia S1 Pressure sensor S2 Temperature sensor V7 Flow rate adjustment valve VL6 Sixth vent pipe (first conduit)

Claims

1. A recovery device comprising: a first tank connected to a first conduit through which gaseous ammonia is supplied, the first tank storing the ammonia in two phases including a gas phase and a liquid phase; and a second conduit passing through the interior of the first tank and containing a cooling fluid, the cooling fluid having a temperature lower than that of the gaseous ammonia supplied from the first conduit.

2. The recovery device according to claim 1, wherein the first tank receives gaseous ammonia from the first conduit in response to a pressure difference between the internal pressure of the first conduit and the internal pressure of the first tank.

3. The recovery device described in claim 1, further comprising: a pressure sensor that measures the internal pressure of the first tank; and a flow rate control valve that adjusts the flow rate of the cooling fluid flowing through the second conduit, wherein the flow rate of the cooling fluid is adjusted based on the pressure measured by the pressure sensor.

4. The recovery device of claim 1, further comprising a second tank circulatingly connected to said second conduit for storing said cooling fluid.

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