Ship and method for use in a ship

Abstract

The ship of the embodiment is provided with: a ship-side tank; a combustion section; a first pipe for transporting liquefied ammonia from a supply-side tank to the ship-side tank; a second pipe for transporting ammonia gas from the ship-side tank to the supply-side tank; a third pipe connecting between the first pipe and the second pipe; and a fourth pipe connecting between at least either one of the first pipe and the second pipe and the combustion section.

Description

Technical Field

[0001] Embodiments of the present invention relate to ships and methods used on ships. Background Technology

[0002] As one of the measures to reduce carbon dioxide emissions, ammonia-fueled ships are being studied.

[0003] Ammonia, whether in liquid or gas form, has a high potential to cause adverse effects on the human body. Therefore, research is underway on the construction and application of structures for the safe replenishment of liquefied ammonia from supply-side tanks to ship-side tanks.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Publication No. 2021-517878 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] Patent Document 1 discloses a refueling system that transfers liquefied gas from a storage tank on a refueling vessel to a fuel tank located on a gas-propelled vessel. However, Patent Document 1 does not disclose the replenishment of liquefied ammonia.

[0009] The objective of embodiments of the present invention is to provide a technique for safely supplying liquefied ammonia from the supply-side tank to the ship-side tank.

[0010] Methods for solving problems

[0011] The first embodiment of the vessel includes: a shipside tank; a combustion unit; a first pipeline for conveying liquefied ammonia from a supply-side tank to the shipside tank; a second pipeline for conveying ammonia gas from the shipside tank to the supply-side tank; a third pipeline connecting the first pipeline and the second pipeline; and a fourth pipeline connecting at least one of the first pipeline and the second pipeline to the combustion unit.

[0012] The second embodiment is a method used in the ship described in the first embodiment, wherein, before replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: opening a valve provided in the third pipeline to change the state between the first pipeline and the second pipeline from a non-connected state to a connected state; supplying nitrogen to the connected portion including the first pipeline, the second pipeline, and the third pipeline; and after supplying nitrogen to the connected portion, opening a valve provided in the fourth pipeline to change the state between the connected portion and the combustion section from a non-connected state to a connected state.

[0013] Based on the method of the second embodiment, in the method of the third embodiment, the object portion includes: a portion of the first pipeline that is not connected to the ship side tank, which is divided by the closure of a valve provided in the first pipeline; a portion of the second pipeline that is not connected to the ship side tank, which is divided by the closure of a valve provided in the second pipeline; and the third pipeline.

[0014] Based on the method of the second embodiment, in the method of the fourth embodiment, the supply includes: supplying nitrogen to the object portion until the pressure of the object portion becomes above a first threshold; opening the valve provided in the fourth pipeline includes: opening the valve provided in the fourth pipeline after the pressure of the object portion becomes above the first threshold; the method further includes: closing the valve provided in the fourth pipeline after the pressure of the object portion becomes below a second threshold lower than the first threshold.

[0015] Based on the method of the fourth embodiment, in the method of the fifth embodiment, the method further comprises: when the gas concentration of the target portion does not meet the benchmark after the valve provided in the fourth pipeline is closed, repeatedly performing the supply, opening the valve provided in the fourth pipeline, and closing the valve provided in the fourth pipeline until the gas concentration of the target portion meets the benchmark.

[0016] The sixth embodiment is a method used in the ship described in the first embodiment, wherein, before replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: opening a valve provided in the fourth pipeline to change the state between the second pipeline and the combustion section from a non-connected state to a connected state.

[0017] The seventh embodiment is a method used in the ship described in the first embodiment, wherein, before replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: opening a valve provided in the third pipeline to change the state between the first pipeline and the second pipeline from a non-connected state to a connected state; and opening a valve provided in the fourth pipeline to change the state between the first pipeline and the combustion section from a non-connected state to a connected state.

[0018] The method of the eighth embodiment is the method used in the ship described in the first embodiment, wherein, before replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: shutting off a valve provided in the third pipeline to change the state between the first pipeline and the second pipeline from a connected state to a disconnected state; opening a valve provided in the second pipeline to change the state between the gas pipeline connected to the supply-side tank and the ship-side tank from a disconnected state to a connected state; and opening a valve provided in the first pipeline to change the state between the liquid pipeline connected to the supply-side tank and the ship-side tank from a disconnected state to a connected state.

[0019] Based on the method of the eighth embodiment, in the method of the ninth embodiment, during the replenishment of liquefied ammonia from the supply-side tank to the ship-side tank, the liquid pipeline and the liquefied ammonia in the first pipeline are transported to the ship-side tank by ammonia gas compressed by the compressor.

[0020] The tenth embodiment is a method used in the ship described in the first embodiment, wherein after replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: opening a valve provided in the third pipeline to change the state between the first pipeline and the second pipeline from a connected state to a disconnected state; and opening a valve provided in the fourth pipeline to change the state between the first pipeline and the combustion section from a disconnected state to a connected state.

[0021] The eleventh embodiment is a method used in the ship described in the first embodiment, wherein after replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: supplying nitrogen to a target portion including the first pipeline, the second pipeline, and the third pipeline; and after supplying nitrogen to the target portion, opening a valve provided in the fourth pipeline to change the state between the target portion and the combustion section from a non-connected state to a connected state.

[0022] Based on the method of the eleventh embodiment, the method of the twelfth embodiment further includes: opening the valve provided in the fourth pipeline and then closing the valve provided in the fourth pipeline; and if the gas concentration of the target portion does not meet the reference after the valve provided in the fourth pipeline is closed, repeatedly performing the supply, opening the valve provided in the fourth pipeline and closing the valve provided in the fourth pipeline until the gas concentration of the target portion meets the reference.

[0023] The thirteenth embodiment is a method used in the ship described in the first embodiment, wherein after replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: opening a valve provided in the fourth pipeline to change the state between the first pipeline and the combustion section from a non-connected state to a connected state; and closing the valve provided in the fourth pipeline after the pressure in the first pipeline falls below a threshold value.

[0024] The fourteenth embodiment is a method used in the ship described in the first embodiment, wherein after replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: opening a valve provided in the fourth pipeline to change the state between the second pipeline and the combustion section from a non-connected state to a connected state; and closing the valve provided in the fourth pipeline after the pressure in the second pipeline falls below a threshold value.

[0025] Based on the methods of any one of the sixth, seventh, tenth, and eleventh embodiments, the method of the fifteenth embodiment further includes: closing a valve provided in the fourth pipeline based on a change in the combustion state in the combustion section.

[0026] Invention Effects

[0027] According to the implementation method, it is possible to safely replenish liquefied ammonia from the supply-side tank to the ship-side tank. Attached Figure Description

[0028] Figure 1 This is a diagram illustrating the structure of the ship and tanker truck according to an example implementation.

[0029] Figure 2 This is a diagram illustrating the method for verifying airtightness using nitrogen in an embodiment.

[0030] Figure 3 This is a diagram illustrating the method for verifying airtightness using nitrogen in an embodiment.

[0031] Figure 4 This is a diagram illustrating the method for verifying airtightness using nitrogen in an embodiment.

[0032] Figure 5 This is a diagram illustrating a method for testing ESD in an implementation.

[0033] Figure 6 This is a diagram illustrating a method for treating residual liquid in the supply-side gas pipeline of an embodiment.

[0034] Figure 7 This is a diagram illustrating a method for treating residual liquid in the supply-side gas pipeline of an embodiment.

[0035] Figure 8 This is a diagram illustrating a method for treating residual liquid in the shipside gas pipeline of an embodiment.

[0036] Figure 9 This is a diagram illustrating a method for treating residual liquid in the shipside gas pipeline of an embodiment.

[0037] Figure 10 This is a diagram illustrating a method for treating residual liquid in the shipside liquid pipeline of an embodiment.

[0038] Figure 11 This is a diagram illustrating a method for treating residual liquid in the shipside liquid pipeline of an embodiment.

[0039] Figure 12 This is a diagram illustrating the supply preparation method of the implementation method.

[0040] Figure 13 This is a diagram illustrating a method for replenishing the second shipside tank in an embodiment.

[0041] Figure 14 This is a diagram illustrating a method for switching the shipside tank in an embodiment.

[0042] Figure 15 This is a diagram illustrating a first example of the loading operation method of the implementation method.

[0043] Figure 16 This is a diagram illustrating a second example of the loading operation method of the implementation method.

[0044] Figure 17 This is a diagram illustrating a third example of the loading operation method of the implementation method.

[0045] Figure 18 This is a diagram illustrating the fourth example of the loading operation method of the implementation method.

[0046] Figure 19 This is a diagram illustrating the loading operation completion method of the implementation method.

[0047] Figure 20 This is a diagram illustrating a method for treating residual gas in a pipeline according to an embodiment.

[0048] Figure 21 This is a diagram illustrating the N2 purification method within the pipeline in an embodiment.

[0049] Figure 22 This is a diagram illustrating the N2 purification method within the pipeline in an embodiment. Detailed Implementation

[0050] The embodiments will be described using the accompanying drawings. Furthermore, the scale of some parts in the drawings used in the following description of the embodiments may be appropriately changed. Additionally, for ease of explanation, the drawings used in the following description of the embodiments may sometimes be shown with omitted structures.

[0051] (Implementation Method)

[0052] Structural Examples

[0053] Figure 1 This is a diagram illustrating the structure of ship 1 and tanker truck 2.

[0054] Ship 1 is an ammonia-fueled ship that is propelled by ammonia. Ship 1 is not limited to a ship that uses ammonia as fuel alone. Ship 1 can also be a ship that uses fuels other than ammonia, such as heavy oil. The term "ammonia" sometimes refers to either ammonia gas or liquefied ammonia, and sometimes it refers to both.

[0055] Ship 1 includes a first side tank 11-1, a second side tank 11-2, a GCU (Gus Combustion Unit) 12, a nitrogen cylinder 13, side liquid pipelines 14, side gas pipelines 15, connecting pipelines 16, combustion pipelines 17, nitrogen pipelines 18, and concentration detection pipelines 19. Piping is a structure that forms a fluid path allowing fluids such as liquids or gases to flow within the space of the pipeline. Piping consists of one or more pipes. Piping can include non-flexible metal pipes. Piping can also include flexible pipes such as hoses.

[0056] The first shipside tank 11-1 is a tank used for storing liquefied ammonia. The first shipside tank 11-1 is an example of a shipside tank installed on ship 1.

[0057] The second shipside tank 11-2 is a tank used for storing liquefied ammonia. The second shipside tank 11-2 is an example of a shipside tank installed on ship 1.

[0058] Hereinafter, the ship side tanks refer to the first ship side tank 11-1 and the second ship side tank 11-2.

[0059] GCU12 is a device for burning ammonia. GCU12 is an example of a combustion section used for burning ammonia.

[0060] Nitrogen cylinder 13 is a cylinder for supplying nitrogen. Nitrogen cylinder 13 is an example of a nitrogen supply unit for supplying nitrogen.

[0061] The ship-side liquid pipeline 14 is connected to the supply-side liquid pipeline 23 and the ship-side tank. The ship-side liquid pipeline 14 connects the supply-side liquid pipeline 23 and the ship-side tank. The ship-side liquid pipeline 14 is used to transport liquefied ammonia from the supply-side tank 21 to the ship-side tank. The end of the ship-side liquid pipeline 14 that connects to the supply-side liquid pipeline 23 is designated as the first end 141. The first end 141 of the ship-side liquid pipeline 14 can be loaded and unloaded relative to the supply-side liquid pipeline 23. The end of the ship-side liquid pipeline 14 that connects to the first ship-side tank 11-1 is designated as the second end 142-1. The end of the ship-side liquid pipeline 14 that connects to the second ship-side tank 11-2 is designated as the second end 142-2. Hereinafter, the second end of the ship-side liquid pipeline 14 refers to the second end 142-1 and the second end 142-2.

[0062] Ship 1 is equipped with valves V16, V17, 1V15, and 2V15 located on the shipside liquid pipeline 14. Valve V17 is the valve closest to the first end 141 of the shipside liquid pipeline 14 among the multiple valves located on the shipside liquid pipeline 14. Valve 1V15 is the valve closest to the second end 142-1 of the shipside liquid pipeline 14 among the multiple valves located on the shipside liquid pipeline 14. Valve 2V15 is the valve closest to the second end 142-2 of the shipside liquid pipeline 14 among the multiple valves located on the shipside liquid pipeline 14. Valve V16 is the valve between valve V17 and either valve 1V15 or valve 2V15.

[0063] The ship-side gas pipeline 15 is connected to the supply-side gas pipeline 24 and the ship-side tank. The ship-side gas pipeline 15 connects the supply-side gas pipeline 24 and the ship-side tank. The ship-side gas pipeline 15 is used to supply ammonia gas from the ship-side tank to the supply-side tank 21. The end of the ship-side gas pipeline 15 that connects to the supply-side gas pipeline 24 is designated as the first end 151. The first end 151 of the ship-side gas pipeline 15 can be loaded and unloaded relative to the supply-side gas pipeline 24. The end of the ship-side gas pipeline 15 that connects to the first ship-side tank 11-1 is designated as the second end 152-1. The end of the ship-side gas pipeline 15 that connects to the second ship-side tank 11-2 is designated as the second end 152-2. Hereinafter, the second end of the ship-side gas pipeline 15 refers to the second end 152-1 and the second end 152-2.

[0064] Ship 1 is equipped with valves V19, V20, 1V18, and 2V18 installed on the shipside gas line 15. Valve V20 is the valve closest to the first end 151 of the shipside gas line 15 among the multiple valves installed on the shipside gas line 15. Valve 1V18 is the valve closest to the second end 152-1 of the shipside gas line 15 among the multiple valves installed on the shipside gas line 15. Valve 2V18 is the valve closest to the second end 152-2 of the shipside gas line 15 among the multiple valves installed on the shipside gas line 15. Valve V19 is the valve between valve V20 and either valve 1V18 or valve 2V18.

[0065] A connecting pipe 16 connects the ship-side liquid line 14 and the ship-side gas line 15. The connecting pipe 16 connects the first end 141 of the ship-side liquid line 14 to valve V17. The connecting pipe 16 connects the first end 151 of the ship-side gas line 15 to valve V20. The ship 1 is equipped with valve V21 installed in the connecting pipe 16.

[0066] Combustion line 17 connects the shipside liquid line 14 to GCU 12 and the shipside gas line 15 to GCU 12. Combustion line 17 includes a first combustion line connected in the shipside liquid line 14 between valve V16 and either valve 1V15 or valve 2V15. Combustion line 17 includes a second combustion line connected in the shipside liquid line 14 between valve V16 and valve V17. Combustion line 17 includes a third combustion line connected in the shipside gas line 15 between valve V19 and either valve 1V18 or valve 2V18. Alternatively, combustion line 17 may also connect at least either the shipside liquid line 14 or the shipside gas line 15 to GCU 12.

[0067] The vessel 1 is equipped with valves V47, V48, and V51 installed in combustion pipeline 17. Valve V47 is a valve installed in the first combustion pipeline included in combustion pipeline 17. Valve V48 is a valve installed in the second combustion pipeline included in combustion pipeline 17. Valve V51 is a valve installed in the third combustion pipeline included in combustion pipeline 17.

[0068] A nitrogen pipeline 18 connects the ship-side liquid pipeline 14 to the nitrogen cylinder 13. The nitrogen pipeline 18 connects the first end 141 of the ship-side liquid pipeline 14 to valve V17. Furthermore, the nitrogen pipeline 18 may also connect at least one of the ship-side liquid pipeline 14 and the ship-side gas pipeline 15 to the nitrogen cylinder 13. The ship 1 is equipped with valve VN17 and valve VN18 disposed on the nitrogen pipeline 18.

[0069] Concentration detection pipeline 19 is connected to the shipside liquid pipeline 14. Concentration detection pipeline 19 connects to valve V17 at its first end 141 within the shipside liquid pipeline 14. Ship 1 is equipped with valve V32 located on concentration detection pipeline 19. Tanker truck 2 is a vehicle used to transport liquefied ammonia supplied to ship 1.

[0070] The oil tanker 2 is equipped with a supply-side tank 21, a compressor 22, a supply-side liquid pipeline 23, and a supply-side gas pipeline 24.

[0071] Supply-side tank 21 is a tank used for storing liquefied ammonia.

[0072] Compressor 22 compresses ammonia gas. Compressor 22 is located on the gas supply side gas pipeline 24.

[0073] The supply-side liquid pipeline 23 is connected to the ship-side liquid pipeline 14 and the supply-side tank 21. The supply-side liquid pipeline 23 connects the ship-side liquid pipeline 14 and the supply-side tank 21. The supply-side liquid pipeline 23 is used to transport liquefied ammonia from the supply-side tank 21 to the ship-side tank. The supply-side liquid pipeline 23 is capable of loading and unloading relative to the ship-side liquid pipeline 14.

[0074] The tanker truck 2 is equipped with valves V1, V3, and EV1 installed on the supply-side liquid pipeline 23. Valve V1 is the valve closest to the end of the supply-side liquid pipeline 23 that connects to the ship-side liquid pipeline 14 among the multiple valves installed on the supply-side liquid pipeline 23. Valve EV1 is the valve closest to the supply-side tank 21 among the multiple valves installed on the supply-side liquid pipeline 23. Valve V3 is the valve between valve V1 and valve EV1.

[0075] The supply-side gas pipeline 24 is connected to the ship-side gas pipeline 15 and the supply-side tank 21. The supply-side gas pipeline 24 connects the ship-side gas pipeline 15 and the supply-side tank 21. The supply-side gas pipeline 24 is used to supply ammonia from the ship-side tank to the supply-side tank 21. The supply-side gas pipeline 24 can be loaded and unloaded relative to the ship-side gas pipeline 15.

[0076] The tanker truck 2 is equipped with valves V2, V6, V12, V13, and EV2 installed on the supply-side gas pipeline 24. Valve V2 is the valve closest to the end of the supply-side gas pipeline 24 that connects to the ship-side gas pipeline 15. Valve EV2 is the valve closest to the supply-side tank 21 among the multiple valves installed on the supply-side gas pipeline 24. Valve V6, valve V12, and valve V13 are valves located between valve V2 and valve EV2.

[0077] The tanker truck 2 is equipped with a valve V5 installed in a pipeline connecting the supply-side liquid pipeline 23 and the supply-side gas pipeline 24. The pipeline equipped with valve V5 is connected between valve V1 and valve V3 in the supply-side liquid pipeline 23. The pipeline equipped with valve V5 is connected between valve V2 and valve V6 in the supply-side gas pipeline 24.

[0078] Valves installed in each pipeline can be opened and closed. When a valve is open, it opens the pipeline. In this case, since the valve does not divide the space within the pipeline, it does not impede the movement of fluid within the pipeline. When a valve is closed, it closes the pipeline. In this case, since the valve divides the space within the pipeline, it impedes the movement of fluid within the pipeline. Valves can also be opened and closed directly by a person. Valves can also open and close automatically based on open or close instructions input by a person through switches or other means.

[0079] The configuration of each pipeline is not limited to Figure 1 The example shown illustrates that the configuration of each pipeline can be appropriately changed. The number and location of valves installed in each pipeline are not limited. Figure 1 The example shown illustrates how the number and location of valves installed in each pipeline can be appropriately changed.

[0080] Pressure gauges for measuring the pressure inside the pipelines are installed in each pipeline. Pressure gauges for measuring the pressure inside the tanks are installed in the first ship-side tank 11-1, the second ship-side tank 11-2, and the supply-side tank 21.

[0081] Liquefied ammonia is supplied from the supply-side tank 21 to the ship-side tank as follows. During the vaporization of liquefied ammonia stored in the ship-side tank, ammonia gas enters the ship-side gas line 15 from the ship-side tank. The ammonia gas flows from the ship-side tank to the supply-side tank 21 via the ship-side gas line 15 and the supply-side gas line 24. The ammonia gas is compressed by the compressor 22 located in the supply-side gas line 24. The compressed ammonia gas pressurizes the supply-side tank 21. The liquefied ammonia stored in the supply-side tank 21 is pressure-transferred from the supply-side tank 21 to the ship-side tank via the supply-side liquid line 23 and the ship-side liquid line 14 based on the pressurization of the ammonia gas.

[0082] The aforementioned vessel 1 is configured to supply ammonia gas from a shipside tank to a supply-side tank 21, thereby replenishing the shipside tank with liquefied ammonia from the supply-side tank 21. Therefore, during the replenishment of liquefied ammonia from the supply-side tank 21 to the shipside tank, it is not necessary to burn the ammonia gas formed by the vaporization of liquefied ammonia in the shipside tank in the GCU 12. Furthermore, the aforementioned vessel 1 is configured to connect the shipside liquid pipeline 14 and the shipside gas pipeline 15 via a connecting pipe 16. Therefore, by appropriately coordinating the shipside liquid pipeline 14 and the shipside gas pipeline 15 before or after replenishing liquefied ammonia, the vessel 1 can efficiently burn any ammonia remaining in the shipside liquid pipeline 14 and the shipside gas pipeline 15 in the GCU 12. In this way, the vessel 1 can safely replenish liquefied ammonia from the supply-side tank 21 to the shipside tank.

[0083] Method of Adding Injection

[0084] The refueling method involves supplying liquefied ammonia from the supply-side tank 21 to the ship-side tank after connecting the ship-side liquid pipeline 14 to the supply-side liquid pipeline 23 and the ship-side gas pipeline 15 to the supply-side gas pipeline 24.

[0085] The refueling methods include those used in ship 1 and those used in tanker truck 2.

[0086] The refueling method may include some or all of the methods described below (1) to (12). Methods (1) to (6) are methods prior to the refueling of liquefied ammonia from the supply-side tank 21 to the ship-side tank. Methods (7) to (10) are methods during the refueling of liquefied ammonia from the supply-side tank 21 to the ship-side tank. Methods (11) and (12) are methods after the refueling of liquefied ammonia from the supply-side tank 21 to the ship-side tank.

[0087] Furthermore, the process described below is merely an example, and the order of processes can be appropriately changed, processes can be omitted, and processes can be added.

[0088] exist Figure 2 In the following diagrams, white indicates a closed valve, and black indicates an open valve. A thick black line on the inner side of the outer edge represents liquefied ammonia in the pipeline. A thick line with vertical stripes on the inner side of the outer edge represents ammonia gas in the pipeline. A thick line with diagonal stripes on the inner side of the outer edge represents nitrogen gas in the pipeline.

[0089] In the following description, a connected part refers to a spatially continuous portion. A connected part is a portion where the fluid can move. A disconnected part refers to a spatially discontinuous portion. A disconnected part is a portion where the fluid cannot move. A connected state refers to a spatially continuous state. A connected state is a state where the fluid can move. A disconnected state refers to a spatially discontinuous state. A disconnected state is a state where the fluid cannot move.

[0090] (1) Method of confirming airtightness using nitrogen gas

[0091] The refueling method includes using nitrogen to confirm airtightness.

[0092] The method of using nitrogen to verify airtightness is used to confirm the airtightness of pipelines.

[0093] The method of verifying airtightness using nitrogen includes steps 1A to 1J, which will be described later.

[0094] Figures 2-4 This diagram illustrates the method of using nitrogen to confirm airtightness.

[0095] Figure 2 It is a diagram related to processes 1A to 1D. Figure 3 It is a diagram related to processes 1E to 1G. Figure 4 It is a diagram related to processes 1H to 1J.

[0096] The opening and closing states of each valve before the nitrogen-based method for confirming airtightness is initiated are referred to as the first opening and closing state. The first opening and closing state is described below.

[0097] There are no open valves in Ship 1. The closed valves in Ship 1 are valves V16, V17, V19, V20, V21, V32, V47, V48, V51, 1V15, 2V15, 1V18, 2V18, VN17, and VN18.

[0098] There are no open valves in tanker truck 2. The closed valves in tanker truck 2 are valve V1, valve V2, valve V3, valve V5, valve V6, valve V12, valve V13, valve EV1, and valve EV2.

[0099] (Process 1A)

[0100] Nitrogen gas is supplied to the liquid pipeline 14 on the ship side and the gas pipeline 15 on the ship side of the tanker truck.

[0101] (Process 1B)

[0102] Open valve V17. The connecting portion of the ship-side liquid line 14 from the first end 141 to the closed valve V16 is called portion A1. Portion A1 of the ship-side liquid line 14 is a portion that is not connected to the ship-side tank, defined by the closure of valve V16. Portion A1 of the ship-side liquid line 14 is an example of the ship-side liquid line 14. The connecting portion of the supply-side liquid line 23 from the end connected to the ship-side liquid line 14 to the closed valve V1 is called portion B1. Portion B1 of the supply-side liquid line 23 is a portion that is not connected to the supply-side tank 21, defined by the closure of valve V1. Portion B1 of the supply-side liquid line 23 is an example of the supply-side liquid line 23. Portion A1 of the ship-side liquid line 14 is a portion that is connected to portion B1 of the supply-side liquid line 23. Portion A1 of the ship-side liquid line 14 is formed by opening valve V17.

[0103] Open valve V20. The portion of the ship-side gas line 15 from the first end 151 to the closed valve V19 is called portion C1. Portion C1 of the ship-side gas line 15 is a portion that is not connected to the ship-side tank, defined by the closure of valve V19. Portion C1 of the ship-side gas line 15 is an example of the ship-side gas line 15. The portion of the supply-side gas line 24 from the end connected to the ship-side gas line 15 to the closed valve V2 is called portion D1. Portion D1 of the supply-side gas line 24 is a portion that does not pass through compressor 22. Portion D1 of the supply-side gas line 24 is a portion that is not connected to the supply-side tank 21, defined by the closure of valve V2. Portion D1 of the supply-side gas line 24 is an example of the supply-side gas line 24. Portion C1 of the ship-side gas line 15 is a portion that is connected to portion D1 of the supply-side gas line 24. A portion C1 of the shipside gas line 15 is formed by opening valve V20.

[0104] Open valve V21. By opening valve V21, the state between portion A1 of the ship-side liquid pipeline 14 and portion C1 of the ship-side gas pipeline 15 is changed from a non-connected state to a connected state. This forms the object portion. The object portion includes portion A1 of the ship-side liquid pipeline 14, portion C1 of the ship-side gas pipeline 15, and connecting pipe 16. The object portion is the connected portion formed by portion A1 of the ship-side liquid pipeline 14, portion C1 of the ship-side gas pipeline 15, and connecting pipe 16. The object portion is the connected portion. The object portion is the portion that is not connected to the ship-side tank.

[0105] (Process 1C)

[0106] Open valves VN17 and VN18. By opening valves VN17 and VN18, nitrogen gas is supplied from nitrogen cylinder 13 to the target section. In a specific example, nitrogen gas is supplied to the target section until the pressure of the target section reaches or exceeds a first threshold. For example, the first threshold is 1.5 MPa, but it is not limited to this. The first threshold can be set appropriately.

[0107] (Process 1D)

[0108] Foaming liquid was sprayed onto the connection between the ship-side liquid line 14 and the supply-side liquid line 23 to confirm gas leakage from this connection. Foaming liquid was then sprayed onto the connection between the ship-side gas line 15 and the supply-side gas line 24 to confirm gas leakage from this connection.

[0109] (Process 1E)

[0110] Close valves VN17 and VN18. In a specific example, valves VN17 and VN18 are closed after the pressure in the target section exceeds a first threshold due to the supply of nitrogen. By closing valves VN17 and VN18, the supply of nitrogen to the target section is stopped.

[0111] (Process 1F)

[0112] Start GCU12 operation.

[0113] (Process 1G)

[0114] After nitrogen is supplied to the target section, valve V48 is opened. In a specific example, valve V48 is opened after the pressure in the target section reaches or exceeds a first threshold due to the supply of nitrogen. By opening valve V48, the state between the target section and GCU12 is changed from a non-connected state to a connected state. Nitrogen in the target section flows from the target section to GCU12. If ammonia remains in the target section, the ammonia remaining in the target section flows from the target section to GCU12. If liquefied ammonia remains in the target section, the liquefied ammonia remaining in the target section flows from the target section to GCU12. The liquefied ammonia may sometimes vaporize during its flow from the target section to GCU12. GCU12 is capable of burning the nitrogen and ammonia flowing to GCU12. GCU12 is capable of burning the ammonia after vaporizing the liquefied ammonia flowing to GCU12.

[0115] (Process 1H)

[0116] After opening valve V48 and allowing the gas flowing from the target section to GCU12 to burn in GCU12, valve V48 is closed. In a specific example, after opening valve V48, valve V48 is closed after the pressure in the target section falls below a second threshold, which is lower than a first threshold. The second threshold is, for example, 0.1 MPa, but is not limited to this. The second threshold can be set appropriately. By closing valve V48, the state between the target section and GCU12 is changed from a connected state to a disconnected state.

[0117] (Process 1I)

[0118] Open valve V32. Measure the gas concentration in the target section. After measuring the gas concentration in the target section, close valve V32. For example, the gas concentration in the target section may be oxygen, but it is not limited to this. The gas concentration in the target section may also be ammonia.

[0119] (Process 1J)

[0120] If the gas concentration in the target section meets the first criterion after valve V48 is closed, the method of verifying airtightness using nitrogen is terminated. For example, meeting the first criterion means that the oxygen concentration in the target section is 4 vol% or less, but it is not limited to this. The first criterion can be appropriately changed. The reduction of ammonia remaining in the target section can be controlled based on the gas concentration in the target section.

[0121] If the gas concentration in the target area does not meet the first reference after valve V48 is closed, repeat steps 1C to 1 until the gas concentration in the target area meets the first reference.

[0122] The opening and closing states of each valve after the nitrogen-based method for confirming airtightness is completed are referred to as the second opening and closing states. The second opening and closing states are described below.

[0123] The valves that are open in vessel 1 are valves V17, V20, and V21. The valves that are closed in vessel 1 are valves V16, V19, V32, V47, V48, V51, 1V15, 2V15, 1V18, 2V18, VN17, and VN18.

[0124] There are no open valves in tanker truck 2. The closed valves in tanker truck 2 are valve V1, valve V2, valve V3, valve V5, valve V6, valve V12, valve V13, valve EV1, and valve EV2.

[0125] By using nitrogen to verify airtightness, nitrogen can be used to safely verify the airtightness of the shipside liquid pipeline 14 and the shipside gas pipeline 15 before replenishing liquefied ammonia. Furthermore, by using nitrogen to verify airtightness, nitrogen can be used to treat any residual ammonia in the shipside liquid pipeline 14 and the shipside gas pipeline 15 before replenishing liquefied ammonia. Through these pre-replenishment procedures for liquefied ammonia, the replenishment of liquefied ammonia from the supply-side tank 21 to the shipside tank can be carried out safely.

[0126] (2) Method for testing ESD (Emergency Shutdown)

[0127] The injection method includes methods for testing ESD.

[0128] The method for testing ESD is to test the operation of valves that automatically open and close according to open or closed instructions. For example, valves V17 and V18 are valves that open and close automatically.

[0129] The methods for testing ESD include processes 2A to 2C.

[0130] Figure 5 This is a diagram used to illustrate the method for testing ESD.

[0131] Before the ESD test begins, the valves are in the second open / closed state described above.

[0132] (Process 2A)

[0133] Close valve V21. By closing valve V21, the connection between the shipside liquid line 14 and the shipside gas line 15 is changed from a connected state to a disconnected state.

[0134] (Process 2B)

[0135] Test valve V17 at room temperature. For example, input a closing instruction to automatically close valve V17. Confirm that valve V17 automatically closes according to the input closing instruction. After confirming that valve V17 automatically closes, open valve V17 by inputting an opening instruction to automatically open valve V17.

[0136] (Process 2C)

[0137] Test valve V20 at room temperature. For example, input a closing instruction to automatically close valve V20. Confirm that valve V20 automatically closes according to the input closing instruction. After confirming that valve V20 automatically closes, open valve V20 by inputting an opening instruction to automatically open valve V20.

[0138] The opening and closing state of each valve after the ESD test is completed is called the third opening and closing state. The third opening and closing state is described below.

[0139] The valves that are open in vessel 1 are valve V17 and valve V20. The valves that are closed in vessel 1 are valve V16, valve V19, valve V21, valve V32, valve V47, valve V48, valve V51, valve 1V15, valve 2V15, valve 1V18, valve 2V18, valve VN17, and valve VN18.

[0140] There are no open valves in tanker truck 2. The closed valves in tanker truck 2 are valve V1, valve V2, valve V3, valve V5, valve V6, valve V12, valve V13, valve EV1, and valve EV2.

[0141] According to the method for testing ESD, the operation of the automatically opening and closing valves can be confirmed before replenishing liquefied ammonia. Through such a pre-replenishment procedure for liquefied ammonia, the replenishment of liquefied ammonia from the supply-side tank 21 to the ship-side tank can be carried out safely.

[0142] (3) Method for handling residual liquid in gas pipeline 24 on the supply side

[0143] The filling method includes a method for treating residual liquid in the supply-side gas line 24.

[0144] The method for treating residual liquid in the supply-side gas pipeline 24 is a method for treating liquefied ammonia formed by reliquefying ammonia gas remaining in the supply-side gas pipeline 24.

[0145] The method for treating residual liquid in the supply-side gas pipeline 24 includes steps 3A to 3I, which will be described later.

[0146] Figure 6 and Figure 7 This is a diagram illustrating a method for treating residual liquid in the gas supply line 24.

[0147] Figure 6 It is a diagram related to processes 3A to 3F. Figure 7 It is a diagram related to processes 3G to 3I.

[0148] Before the method for treating residual liquid in the gas supply line 24 begins, the opening and closing states of each valve are relative to the third opening and closing state, which is to close valve V20.

[0149] (Process 3A)

[0150] Open valves EV1 and EV2. In a specific example, open valves EV1 and EV2 simultaneously.

[0151] (Process 3B)

[0152] Open valve V6. The section of the supply-side gas line 24 from the supply-side tank 21 to the closed valve V2 is called section D2. Section D2 of the supply-side gas line 24 is the section that does not pass through compressor 22. Section D2 of the supply-side gas line 24 is the section that is in communication with the supply-side tank 21. Section D2 of the supply-side gas line 24 is the section that is not in communication with the ship-side gas line 15. Section D2 of the supply-side gas line 24 is an example of the supply-side gas line 24.

[0153] By opening valve EV2 in step 3A and valve V6 in step 3B, part D2 of the supply-side gas pipeline 24 is formed.

[0154] (Process 3C)

[0155] Open valve V5.

[0156] (Process 3D)

[0157] Open valve V1.

[0158] (Process 3E)

[0159] Open valve V48. By opening valve V48, the state between portion D2 of the supply-side gas line 24 and GCU12 is changed from a non-connected state to a connected state. The liquefied ammonia remaining in portion D2 of the supply-side gas line 24 flows from portion D2 of the supply-side gas line 24 to GCU12. The liquefied ammonia may sometimes vaporize during its flow from portion D2 of the supply-side gas line 24 to GCU12.

[0160] (Process 3F)

[0161] The ammonia flowing from the portion D2 of the supply-side gas line 24 to the GCU12 is combusted in the GCU12. The GCU12 is capable of combusting the ammonia gas formed by the vaporization of liquefied ammonia during the flow from the portion D2 of the supply-side gas line 24 to the GCU12. The GCU12 is capable of combusting the ammonia gas after the liquefied ammonia flowing from the portion D2 of the supply-side gas line 24 to the GCU12 has been vaporized.

[0162] (Process 3G)

[0163] After opening valve V48 and after the ammonia flowing from portion D2 of the supply-side gas line 24 to GCU12 is burned in GCU12, valve V48 is closed. By closing valve V48, the state between portion D2 of the supply-side gas line 24 and GCU12 is changed from a connected state to a disconnected state. For example, valve V48 can be closed based on the amount of ammonia burned in GCU12. The amount of ammonia burned in GCU12 can be measured using a flow meter. The threshold of the amount of ammonia used as the standard for closing valve V48 can be appropriately set. Alternatively, valve V48 can also be closed based on changes in the combustion conditions in GCU12. The combustion conditions in GCU12 indicate how the gas burns in GCU12. For example, the combustion conditions in GCU12 can be the combustion temperature in GCU12, but it is not limited to this. As the amount of liquefied ammonia remaining in portion D2 of the supply-side gas line 24 decreases due to the combustion of ammonia in GCU12, the combustion temperature in GCU12 will change. Therefore, the reduction of liquefied ammonia remaining in the portion D2 of the supply-side gas line 24 can be determined based on the temperature change of combustion in GCU12. Valve V48 can also be closed based on changes in the gas concentration in the portion D2 of the supply-side gas line 24.

[0164] (Process 3H)

[0165] Close valve V1.

[0166] (Process 3I)

[0167] Close valve V5.

[0168] The opening and closing states of each valve after the method for treating the residual liquid in the supply-side gas pipeline 24 is completed is called the fourth opening and closing state. The fourth opening and closing state is described below.

[0169] The valve that is open in ship 1 is valve V17. The valves that are closed in ship 1 are valve V16, valve V19, valve V20, valve V21, valve V32, valve V47, valve V48, valve V51, valve 1V15, valve 2V15, valve 1V18, valve 2V18, valve VN17, and valve VN18.

[0170] The valves that are open in tanker truck 2 are valve V6, valve EV1, and valve EV2. The valves that are closed in tanker truck 2 are valve V1, valve V2, valve V3, valve V5, valve V12, and valve V13.

[0171] According to the method for treating residual liquid in the supply-side gas pipeline 24, the reliquefied ammonia remaining in the supply-side gas pipeline 24 can be treated before replenishing the ammonia. If ammonia remains in the supply-side gas pipeline 24, it may flow to the operating compressor 22 during the replenishment of ammonia. Therefore, before replenishing the ammonia, it is necessary to completely create a gaseous atmosphere in the supply-side gas pipeline 24. Through this pre-replenishment procedure, the replenishment of ammonia from the supply-side tank 21 to the ship-side tank can be carried out safely.

[0172] (4) Method for treating residual liquid in shipside gas pipeline 15

[0173] The refueling method includes a method for treating residual liquid in the shipside gas line 15.

[0174] The method for treating residual liquid in the shipside gas pipeline 15 is a method for treating liquefied ammonia, which is produced by reliquefying ammonia gas remaining in the shipside gas pipeline 15.

[0175] The method for treating residual liquid in the shipside gas pipeline 15 includes steps 4A to 4E, which are described later.

[0176] Figure 8 and Figure 9 This is a diagram illustrating a method for treating residual liquid in the ship-side gas pipeline 15.

[0177] Figure 8 It is a diagram related to processes 4A to 4D. Figure 9 This is a diagram related to process 4E.

[0178] Before the method for treating residual liquid in the shipside gas pipeline 15 begins, the valves are in the fourth open / closed state described above.

[0179] (Process 4A)

[0180] Open valve 1V18.

[0181] (Process 4B)

[0182] Open valve 2V18.

[0183] The connecting portion of the ship-side gas pipeline 15 from the ship-side tank to the closed valve V19 is referred to as portion C2. Portion C2 of the ship-side gas pipeline 15 is the portion that is in communication with the ship-side tank. Portion C2 of the ship-side gas pipeline 15 is the portion that is not in communication with the supply-side gas pipeline 24. Portion C2 of the ship-side gas pipeline 15 is an example of the ship-side gas pipeline 15.

[0184] By opening valve 1V18 in process 4A and valve 2V18 in process 4B, part C2 of the shipside gas pipeline 15 is formed.

[0185] (Process 4C)

[0186] Open valve V51. For example, open valve V51 slightly. By opening valve V51, the state between portion C2 of the shipside gas line 15 and GCU12 is changed from a non-connected state to a connected state. The liquefied ammonia remaining in portion C2 of the shipside gas line 15 flows from portion C2 of the shipside gas line 15 to GCU12. The liquefied ammonia may sometimes vaporize during its flow from portion C2 of the shipside gas line 15 to GCU12.

[0187] (Process 4D)

[0188] Ammonia flowing from a portion of the C2 in the ship-side gas line 15 to the GCU12 is combusted in the GCU12. The GCU12 is capable of combusting the ammonia gas formed by the vaporization of liquefied ammonia during the flow of C2 from the ship-side gas line 15 to the GCU12. The GCU12 is capable of combusting the ammonia gas after the vaporization of liquefied ammonia flowing from the ship-side gas line 15 to the GCU12.

[0189] (Process 4E)

[0190] After opening valve V51 and after the ammonia flowing from portion C2 of the ship-side gas line 15 to GCU12 has burned in GCU12, valve V51 is closed. By closing valve V51, the state between portion C2 of the ship-side gas line 15 and GCU12 is changed from a connected state to a disconnected state. For example, valve V51 can be closed based on changes in the combustion conditions in GCU12, as described above. Alternatively, valve V51 can be closed based on the amount of ammonia burned in GCU12. Valve V51 can also be closed based on changes in the gas concentration in portion C2 of the ship-side gas line 15.

[0191] The opening and closing states of each valve after the method for treating the residual liquid in the ship-side gas pipeline 15 is completed are referred to as the fifth opening and closing state. The fifth opening and closing state is described below.

[0192] The valves that are open in vessel 1 are valves V17, 1V18, and 2V18. The valves that are closed in vessel 1 are valves V16, V19, V20, V21, V32, V47, V48, V51, 1V15, 2V15, VN17, and VN18.

[0193] The valves that are open in tanker truck 2 are valve V6, valve EV1, and valve EV2. The valves that are closed in tanker truck 2 are valve V1, valve V2, valve V3, valve V5, valve V12, and valve V13.

[0194] According to the method for handling residual liquid in the ship-side gas pipeline 15, the reliquefied ammonia remaining in the ship-side gas pipeline 15 can be treated before replenishment. If ammonia remains in the ship-side gas pipeline 15, it may flow to the operating compressor 22 during replenishment. Therefore, before replenishment, the ship-side gas pipeline 15 needs to be completely filled with a gaseous atmosphere. Through this pre-replenishment procedure, the replenishment of ammonia from the supply-side tank 21 to the ship-side tank can be carried out safely.

[0195] (5) Method for handling residual liquid in the shipside liquid pipeline 14

[0196] The refueling method includes a method for treating residual liquid in the shipside liquid line 14.

[0197] The method for treating residual liquid in the shipside liquid pipeline 14 is a method for treating liquefied ammonia, which is produced by reliquefying ammonia gas remaining in the shipside liquid pipeline 14.

[0198] The method for treating residual liquid in the shipside liquid pipeline 14 includes steps 5A to 5J, which will be described later.

[0199] Figure 10 and Figure 11 This is a diagram illustrating a method for treating residual liquid in the ship's side liquid line 14.

[0200] Figure 10 This is a diagram related to processes 5A through 5E. Figure 10 It is a diagram related to processes 5F to 5J.

[0201] Before the method for treating residual liquid in the shipside liquid pipeline 14 begins, the valves are in the fifth open / closed state described above.

[0202] (Process 5A)

[0203] Open valve V21. By opening valve V21, the state between the shipside liquid line 14 and the shipside gas line 15 is changed from a non-connected state to a connected state.

[0204] (Process 5B)

[0205] Open valve V20.

[0206] (Process 5C)

[0207] Open valve V19. By opening valve V19, a ship-side gas line 15 is formed that is in communication with the ship-side tank. The ship-side gas line 15 is in communication with part D1 of the aforementioned supply-side gas line 24.

[0208] (Process 5D)

[0209] Open valve V16. The connecting portion of the ship-side liquid line 14 from the first end 141 to the closed valves 1V15 and 2V15 is called portion A2. Portion A2 of the ship-side liquid line 14 is a portion that is not connected to the ship-side tank, defined by the closure of valves 1V15 and 2V15. Portion A2 of the ship-side liquid line 14 is a portion that is connected to portion B1 of the aforementioned supply-side liquid line 23. Portion A2 of the ship-side liquid line 14 is an example of the ship-side liquid line 14. Portion A2 of the ship-side liquid line 14 is formed by opening valve V16.

[0210] (Process 5E)

[0211] The connection between the shipside tank, shipside gas pipeline 15, and shipside liquid pipeline 14 (section A2) is confirmed. In this connected state, ammonia gas generated in the shipside tank flows from the shipside tank through shipside gas pipeline 15 and connecting pipeline 16 to section A2 of shipside liquid pipeline 14. In this connected state, the pressures measured in the first shipside tank 11-1, the second shipside tank 11-2, shipside gas pipeline 15, and section A2 of shipside liquid pipeline 14 are all the same. By confirming these pressure values, the connection between the shipside tank, shipside gas pipeline 15, and shipside liquid pipeline 14 (section A2) can be verified.

[0212] (Process 5F)

[0213] Close valve 1V18.

[0214] (Process 5G)

[0215] Close valve 2V18.

[0216] The portion of the ship-side gas pipeline 15 from the first end 151 to the closed valves 1V18 and 2V18 is referred to as portion C3. Portion C3 of the ship-side gas pipeline 15 is not connected to the ship-side tank. Portion C3 of the ship-side gas pipeline 15 is connected to portion D1 of the aforementioned supply-side gas pipeline 24. Portion C3 of the ship-side gas pipeline 15 is an example of the ship-side gas pipeline 15.

[0217] By closing valve 1V18 in step 5F and valve 2V18 in step 5G, part C3 of the shipside gas pipeline 15 is formed. This changes the connection between part A2 of the shipside liquid pipeline 14 and the shipside tank from a connected state to a disconnected state.

[0218] (Process 5H)

[0219] Open valves V47 and V48. By opening valves V47 and V48, the state between portion A2 of the shipside liquid line 14 and GCU12 is changed from a non-connected state to a connected state. The liquefied ammonia remaining in portion A2 of the shipside liquid line 14 flows from portion A2 of the shipside liquid line 14 to GCU12. The liquefied ammonia may sometimes vaporize during its flow from portion A2 of the shipside liquid line 14 to GCU12.

[0220] (Process 5I)

[0221] The ammonia flowing from the ship-side liquid line A2 to GCU12 is combusted in GCU12. GCU12 is capable of combusting the ammonia gas formed by the vaporization of liquefied ammonia during the flow from the ship-side liquid line A2 to GCU12. GCU12 is capable of combusting the ammonia gas after the liquefied ammonia flowing from the ship-side liquid line A2 to GCU12 has been vaporized.

[0222] (Process 5J)

[0223] After opening valves V47 and V48, and after the ammonia flowing from portion A2 of the ship-side liquid line 14 to GCU12 is burned in GCU12, valves V47 and V48 are closed. By closing valves V47 and V48, the state between portion A2 of the ship-side liquid line 14 and GCU12 is changed from a connected state to a disconnected state. For example, valves V47 and V48 can be closed based on the pressure of the ammonia gas supplied to GCU12. Due to the combustion of ammonia gas in GCU12, the pressure of the ammonia gas decreases. Therefore, the reduction of liquefied ammonia remaining in portion A2 of the ship-side liquid line 14 can be determined based on the decrease in ammonia gas pressure. The pressure threshold used as the standard for closing valves V47 and V48 can be appropriately set. Alternatively, valves V47 and V48 can be closed based on the amount of ammonia burned in GCU12. Valve V47 and V48 can also be closed based on changes in the combustion conditions in GCU12. The combustion conditions in GCU12 are as described above. Valve V47 and valve V48 can also be closed based on changes in the gas concentration in section A2 of the shipside liquid line 14.

[0224] The opening and closing states of each valve after the method for treating the residual liquid in the shipside liquid pipeline 14 is completed is referred to as the sixth opening and closing state. The sixth opening and closing state is described below.

[0225] The valves that are open in vessel 1 are valves V16, V17, V19, V20, and V21. The valves that are closed in vessel 1 are valves V32, V47, V48, V51, 1V15, 2V15, 1V18, 2V18, VN17, and VN18.

[0226] The valves that are open in tanker truck 2 are valve V6, valve EV1, and valve EV2. The valves that are closed in tanker truck 2 are valve V1, valve V2, valve V3, valve V5, valve V12, and valve V13.

[0227] According to the method for treating residual liquid in the ship-side liquid line 14, the reliquefied ammonia remaining in the ship-side liquid line 14 can be treated before replenishing the ammonia. Reliquefied ammonia often contains impurities, but this can be addressed by treating the residual liquid in the ship-side liquid line 14. In this method, the ship-side liquid line 14 is completely filled with a gaseous atmosphere. This removes not only ammonia from the ship-side liquid line 14 but also impurities such as air, moisture, and nitrogen, thus preventing them from entering the ship-side tank or freezing inside the ship-side liquid line 14. Furthermore, by passing ammonia gas through the ship-side liquid line 14, it can be confirmed that there are no leaks from the ship-side liquid line 14 before replenishing the ammonia. Through this pre-replenishment process, the replenishment of ammonia from the supply-side tank 21 to the ship-side tank can be carried out safely.

[0228] (6) Supply preparation methods

[0229] The refueling method includes the supply preparation method.

[0230] The replenishment preparation method is a method for preparing to replenish liquefied ammonia from the supply-side tank 21 to the ship-side tank.

[0231] The supply preparation method includes steps 6A to 6G, which will be described later.

[0232] Figure 12 It is a diagram used to illustrate the method of supply preparation.

[0233] Before the supply preparation method begins, the opening and closing status of each valve is the sixth opening and closing status mentioned above.

[0234] (Process 6A)

[0235] Close valve V21. By closing valve V21, the connection between portion A2 of the shipside liquid line 14 and portion C3 of the shipside gas line 15 is changed from a connected state to a disconnected state.

[0236] (Process 6B)

[0237] Open valve 1V18.

[0238] (Process 6C)

[0239] Open valve 2V18.

[0240] By opening valve 1V18 in step 6B and valve 2V18 in step 6C, the state between portion D1 of the supply-side gas pipeline 24 and the ship-side tank is changed from a non-connected state to a connected state. The ship-side gas pipeline 15 connects portion D1 of the supply-side gas pipeline 24 to the ship-side tank in the connected state.

[0241] (Process 6D)

[0242] Open valve V2.

[0243] By opening valve V2, the state between supply-side tank 21 and ship-side gas line 15 is changed from a non-connected state to a connected state. Supply-side gas line 24 connects supply-side tank 21 and ship-side gas line 15 in the connected state.

[0244] Through processes 6B, 6C, and 6D, the state between the supply-side tank 21 and the ship-side tank changes from a non-connected state to a connected state in the paths of the ship-side gas pipeline 15 and the supply-side gas pipeline 24.

[0245] (Process 6E)

[0246] Open valves V1 and V3.

[0247] By opening valves V1 and V3, the state between the supply-side tank 21 and part A2 of the ship-side liquid pipeline 14 is changed from a non-connected state to a connected state. The supply-side liquid pipeline 23 connects the supply-side tank 21 and part A2 of the ship-side liquid pipeline 14 in the connected state.

[0248] (Process 6F)

[0249] Open valve 1V15.

[0250] (Process 6G)

[0251] Open valve 2V15.

[0252] By opening valve 1V15 in process 6F and valve 2V15 in process 6G, the state between the supply-side liquid pipeline 23 and the ship-side tank is changed from a non-connected state to a connected state. The ship-side liquid pipeline 14 connects the supply-side liquid pipeline 23 and the ship-side tank in the connected state.

[0253] Through processes 6E, 6F, and 6G, the state between the supply-side tank 21 and the ship-side tank changes from a non-connected state to a connected state in the paths of the ship-side liquid pipeline 14 and the supply-side liquid pipeline 23.

[0254] The replenishment preparation method establishes a connection between the supply-side tank 21 and the ship-side tank through the paths of the ship-side gas pipeline 15 and the supply-side gas pipeline 24. Therefore, ammonia gas generated in the ship-side tank can flow to the supply-side tank 21 via the ship-side gas pipeline 15 and the supply-side gas pipeline 24. Similarly, the replenishment preparation method establishes a connection between the supply-side tank 21 and the ship-side tank through the paths of the ship-side liquid pipeline 14 and the supply-side liquid pipeline 23. Therefore, liquefied ammonia stored in the supply-side tank 21 can flow to the ship-side tank via the ship-side liquid pipeline 14 and the supply-side liquid pipeline 23.

[0255] The opening and closing status of each valve after the supply preparation method is completed is called the seventh opening and closing status. The seventh opening and closing status is described below.

[0256] The valves open in vessel 1 are valves V16, V17, V19, V20, 1V15, 2V15, 1V18, and 2V18. The valves closed in vessel 1 are valves V21, V32, V47, V48, V51, VN17, and VN18.

[0257] The valves that are open in tanker truck 2 are valves V1, V2, V3, V6, EV1, and EV2. The valves that are closed in tanker truck 2 are valves V5, V12, and V13.

[0258] According to the replenishment preparation method, the shipside liquid pipeline 14 can be adjusted before replenishing liquefied ammonia to transport liquefied ammonia from the supply-side tank 21 to the shipside tank, and the shipside gas pipeline 15 can be adjusted to transport ammonia gas from the shipside tank to the supply-side tank 21. Thus, during liquefied ammonia replenishment, ammonia gas is transported from the shipside tank to the supply-side tank 21. Through such pre-replenishment procedures, the replenishment of liquefied ammonia from the supply-side tank 21 to the shipside tank can be carried out safely.

[0259] (7) Method for replenishing the second ship side tank 11-2

[0260] The refueling method includes replenishing the second ship side tank 11-2.

[0261] The method for replenishing the second shipside tank 11-2 is a method for replenishing liquefied ammonia from the supply side tank 21 to the second shipside tank 11-2.

[0262] The method for replenishing the second ship side tank 11-2 includes steps 7A to 7K, which will be described later.

[0263] Figure 13 This diagram illustrates the method of resupplying the second ship's side tank 11-2.

[0264] Before the method of replenishing the second ship side tank 11-2 begins, the opening and closing states of each valve are the seventh opening and closing state mentioned above.

[0265] (Process 7A)

[0266] Contact all relevant departments to begin resupplying the ship's side tanks. Inform them of the planned quantity of tanks to be resupplyed.

[0267] (Process 7B)

[0268] Close valve 1V15. By closing valve 1V15, the state between the supply-side liquid line 23 and the first ship-side tank 11-1 is changed from a connected state to a disconnected state. As a result, the state between the supply-side tank 21 and the first ship-side tank 11-1 changes from a connected state to a disconnected state along the paths of the ship-side liquid line 14 and the supply-side liquid line 23.

[0269] (Process 7C)

[0270] Close valve V6.

[0271] (Process 7D)

[0272] Open valve V12.

[0273] (Process 7E)

[0274] Open valve V13.

[0275] Through processes 7C, 7D, and 7E, the path of ammonia flow in the supply-side gas pipeline 24 is changed. The path of ammonia flow is changed from the path where ammonia from the ship-side tank enters the supply-side tank 21 without passing through the compressor 22 to the path where it enters the supply-side tank 21 via the compressor 22.

[0276] (Process 7F)

[0277] Start compressor 22.

[0278] Ammonia gas compressed by compressor 22 pressurizes the supply-side tank 21. The pressure in the supply-side tank 21 is higher than that in the ship-side tank. Therefore, the liquefied ammonia stored in the supply-side tank 21 is pressure-transferred to the ship-side tank via the supply-side liquid pipeline 23 and the ship-side liquid pipeline 14.

[0279] (Process 7G)

[0280] The connection between the shipside tank, shipside liquid line 14, and shipside gas line 15 is confirmed. When the connection is established, the pressure rise measured in the first shipside tank 11-1, the second shipside tank 11-2, the shipside liquid line 14, and the shipside gas line 15 is the same. For example, the rise is approximately 0.2 MPaG, but it is not limited to this. By confirming the pressure values, the connection between the shipside tank, shipside liquid line 14, and shipside gas line 15 can be verified.

[0281] (Process 7H)

[0282] The system confirms that there is no leakage of liquefied ammonia from the hose portion of the supply-side liquid line 23 (from valve V1 to the end connected to the ship-side liquid line 14). The system also confirms that there is no leakage of liquefied ammonia from the connection between the first end 141 of the ship-side liquid line 14 and the end of the supply-side liquid line 23. Similarly, the system confirms that there is no leakage of ammonia from the hose portion of the supply-side gas line 24 (from valve V2 to the end connected to the ship-side gas line 15). Finally, the system confirms that there is no leakage of ammonia from the connection between the first end 151 of the ship-side gas line 15 and the end of the supply-side gas line 24. For example, a gas detector can be used to confirm leakage. Alternatively, a manifold gauge can also be used to confirm leakage.

[0283] (Process 7I)

[0284] The compressor 22 is activated to raise the pressure in the supply-side tank 21 to a first pressure value. For example, the first pressure value is 0.35 MPa, but it is not limited to this. The first pressure value can be changed as appropriate.

[0285] (Process 7J)

[0286] Confirm that the liquid level in supply-side tank 21 has begun to rise. Confirm that there is no leakage, similar to process 7H. Confirm that there is no rapid pressure rise in the second-side tank 11-2 caused by the vaporization of liquefied ammonia.

[0287] (Process 7K)

[0288] The compressor 22 is activated to raise the pressure in the supply-side tank 21 to a second pressure value higher than the first pressure value. For example, the second pressure value is 0.5 MPa, but it is not limited to this. The second pressure value can be changed as appropriate.

[0289] The opening and closing states of each valve after the method of replenishing the second ship side tank 11-2 has been completed are referred to as the eighth opening and closing state. The eighth opening and closing state is described below.

[0290] The valves open in vessel 1 are valves V16, V17, V19, V20, 2V15, 1V18, and 2V18. The valves closed in vessel 1 are valves V21, V32, V47, V48, V51, 1V15, VN17, and VN18.

[0291] The valves that are open in tanker truck 2 are valves V1, V2, V3, V12, V13, EV1, and EV2. The valves that are closed in tanker truck 2 are valves V5 and V6.

[0292] According to the method of replenishing the second shipside tank 11-2, during the replenishment of liquefied ammonia, the pressure of the supply-side tank 21 can be maintained higher than that of the second shipside tank 11-2 by the operation of the compressor 22. As a result, the liquefied ammonia in the supply-side liquid line 23 and the shipside liquid line 14 is transported to the second shipside tank 11-2 by the ammonia gas compressed by the compressor 22. Thus, liquefied ammonia can flow from the supply-side tank 21 to the second shipside tank 11-2. The compressor 22 can cause the pressure of the supply-side tank 21 to rise in stages. This prevents a rapid rise in the pressure of the second shipside tank 11-2 due to the vaporization of the liquefied ammonia within it. Through this process during the replenishment of liquefied ammonia, the replenishment of liquefied ammonia from the supply-side tank 21 to the shipside tank can be carried out safely.

[0293] (8) Method for switching shipside tanks

[0294] The refueling method includes switching the ship's side tanks.

[0295] The method for switching the shipside tank is a method for switching the shipside tank from the second shipside tank 11-2 to the first shipside tank 11-1, which is used to supply liquefied ammonia from the supply side tank 21.

[0296] The method for switching the shipside tank includes steps 8A to 8C, which will be described later. During steps 8A to 8C, compressor 22 continuously compresses ammonia gas.

[0297] Figure 14 This diagram illustrates the method for switching the ship's side tanks.

[0298] Before the method of switching the shipside tank begins, the opening and closing states of each valve are as described in the eighth opening and closing state above.

[0299] (Process 8A)

[0300] Open valve 1V15 before loading the predetermined amount of liquefied ammonia into the second ship-side tank 11-2. For example, before loading the predetermined amount, it could be 2% of the predetermined amount, but this is not a limitation.

[0301] By opening valve 1V15, the state between the supply-side liquid line 23 and the first ship-side tank 11-1 is changed from a disconnected state to a connected state. Consequently, the state between the supply-side tank 21 and the first ship-side tank 11-1 changes from a disconnected state to a connected state along the paths of the ship-side liquid line 14 and the supply-side liquid line 23. The liquefied ammonia in the supply-side liquid line 23 and the ship-side liquid line 14 is transported to the first ship-side tank 11-1 by ammonia gas compressed by compressor 22. Thus, liquefied ammonia can flow from the supply-side tank 21 to the first ship-side tank 11-1.

[0302] (Process 8B)

[0303] Close valve 2V15. By closing valve 2V15, the state between the supply-side liquid line 23 and the second ship-side tank 11-2 is changed from a connected state to a disconnected state. As a result, the state between the supply-side tank 21 and the second ship-side tank 11-2 changes from a connected state to a disconnected state along the paths of the ship-side liquid line 14 and the supply-side liquid line 23.

[0304] (Process 8C)

[0305] Notify that the reception of liquefied ammonia in the second ship's side tank 11-2 is complete.

[0306] The opening and closing states of each valve after the method of switching the shipside tanks is completed are referred to as the ninth opening and closing state. The ninth opening and closing state is described below.

[0307] The valves open in vessel 1 are valves V16, V17, V19, V20, 1V15, 1V18, and 2V18. The valves closed in vessel 1 are valves V21, V32, V47, V48, V51, 2V15, VN17, and VN18.

[0308] The valves that are open in tanker truck 2 are valves V1, V2, V3, V12, V13, EV1, and EV2. The valves that are closed in tanker truck 2 are valves V5 and V6.

[0309] (9) Loading operation method

[0310] The refueling method includes the loading operation method.

[0311] The loading operation method is a method for using ammonia gas to pressurize the liquefied ammonia remaining in the supply-side liquid pipeline 23 and the ship-side liquid pipeline 14 into the first ship-side tank 11-1. Through the loading operation method, the liquefied ammonia in the supply-side liquid pipeline 23 and the ship-side liquid pipeline 14 is transported to the first ship-side tank 11-1 using ammonia gas compressed by the compressor 22.

[0312] The first to fourth examples of the loading operation method will be explained. In the loading operation method, any one of the first to fourth examples can be performed, or multiple examples can be performed sequentially.

[0313] The first example of a loading operation method will be explained.

[0314] The first example is an instance where pressurization of the supply tank 21 continues without changing the opening and closing of the valve on the tanker truck 2 after switching the method of the ship-side tank.

[0315] The first example includes processes 9A to 9B, which will be described later. During processes 9A to 9C, compressor 22 continuously compresses ammonia gas.

[0316] Figure 15 This is a diagram used to illustrate the first example of a loading operation method.

[0317] Before the first example begins, the opening and closing states of each valve are the ninth opening and closing state mentioned above.

[0318] Here, as a first example, the following operation will be explained: while the ammonia gas from the ship side tank is pressurized by the compressor 22, high-pressure gas is supplied to the supply side tank 21 to force the liquefied ammonia remaining in the liquid pipeline into the ship side tank.

[0319] (Process 9A)

[0320] The instruction is to contact the supplier if the remaining amount of liquefied ammonia stored in the supply-side tank 21 reaches the specified amount and ammonia gas is mixed into the liquefied ammonia. For example, the specified amount is 1 ton, but it is not limited to this. The specified amount can be changed appropriately.

[0321] (Process 9B)

[0322] Ammonia gas is used to pressurize the liquefied ammonia remaining in the supply-side liquid line 23 and the ship-side liquid line 14 into the first ship-side tank 11-1. Here, the supply-side tank 21 is pressurized by ammonia gas compressed by the compressor 22. The pressure in the supply-side tank 21 is higher than the pressure in the first ship-side tank 11-1. Therefore, the ammonia gas in the supply-side tank 21 uses the pressure difference to push out the liquefied ammonia remaining in the supply-side liquid line 23 and the ship-side liquid line 14 while simultaneously flowing towards the first ship-side tank 11-1.

[0323] The opening and closing states of the valves after the first example of the loading operation method are the ninth opening and closing states mentioned above.

[0324] The second example of the loading operation method will be explained.

[0325] The second example is an instance where the operation of compressor 22 is stopped after switching the shipside tank.

[0326] The second example includes processes 9C to 9D, which will be described later.

[0327] Figure 16 This is a diagram used to illustrate the second example of a loading operation method.

[0328] The opening and closing states of each valve before the start of the second example are the ninth opening and closing states mentioned above.

[0329] Here, as a second example, the following operation will be explained: after the compressor 22 stops, the ammonia gas in the supply side tank 21 is supplied to the liquid pipeline, and the liquefied ammonia remaining in the liquid pipeline is pressed into the ship side tank.

[0330] (Process 9C)

[0331] Similar to process 9A, it is indicated that if the remaining amount of liquefied ammonia stored in the supply-side tank 21 reaches the specified amount and ammonia gas is mixed into the liquefied ammonia, then communication will be made.

[0332] (Process 9D)

[0333] Ammonia gas is used to pressurize the liquefied ammonia remaining in the supply-side liquid pipeline 23 and the ship-side liquid pipeline 14 into the first ship-side tank 11-1. Here, valve V3 is closed. Valve V2 is closed. Valves V12 and V13 are closed. Valve V5 is opened. This stops the operation of compressor 22.

[0334] The portion of the supply-side liquid pipeline 23 that extends from the end connected to the ship-side liquid pipeline 14 to the closed valve V3 is referred to as portion B2. Portion B2 of the supply-side liquid pipeline 23 is a portion that is not connected to the supply-side tank 21, defined by the closure of valve V3. Portion B2 of the supply-side liquid pipeline 23 is an example of the supply-side liquid pipeline 23. By closing valves V3, V2, V12, and V13 and opening valve V5, a path is formed between the supply-side tank 21 and the first ship-side tank 11-1 that sequentially passes through portion D2 of the supply-side gas pipeline 24, portion B2 of the supply-side liquid pipeline 23, and the connected state of the ship-side liquid pipeline 14.

[0335] As described above, when the pressure in the supply-side tank 21 is sufficiently higher than that in the ship-side tank, the compressor 22 is stopped and valves V2 and V3 are closed, causing the supply-side tank 21 to enter a pressurized state. Therefore, by opening valve V5, the ammonia gas in the supply-side tank 21 flows towards the first ship-side tank 11-1 while using the pressure difference to push out a portion of B2 remaining in the supply-side liquid line 23 and the liquefied ammonia in the ship-side liquid line 14.

[0336] The third example of a loading operation method will be explained.

[0337] The third example is an instance where ammonia gas from the supply-side tank 21 is compressed using compressor 22 after switching the ship-side tank.

[0338] The third example includes processes 9E to 9F, which will be described later. During processes 9E to 9F, compressor 22 continuously compresses ammonia gas.

[0339] Figure 17 This is a diagram used to illustrate the third example of a loading operation method.

[0340] The opening and closing states of the valves before the start of the third example are the ninth opening and closing state mentioned above. Furthermore, the configuration of the valves and pipelines in tanker truck 2 differs from... Figure 1 The configurations differ in different parts.

[0341] Here, as a third example, the following operation will be explained: while the ammonia gas in the supply side tank 21 is pressurized by the compressor 22, it is supplied to the liquid pipeline, and the liquefied ammonia remaining in the liquid pipeline is forced into the ship side tank.

[0342] (Process 9E)

[0343] Similar to process 9A, it is indicated that if the remaining amount of liquefied ammonia stored in the supply-side tank 21 reaches the specified amount and ammonia gas is mixed into the liquefied ammonia, then communication will be made.

[0344] (Process 9F)

[0345] Ammonia gas is used to pressurize the liquefied ammonia remaining in the supply-side liquid line 23 and the ship-side liquid line 14 into the first ship-side tank 11-1. Here, valve V3 is closed. Valve V2 is closed. Valve V6 is closed. Valve V5 is opened. The connecting portion of the supply-side gas line 24 from the supply-side tank 21 to the closed valve V2 is called portion D3. Portion D3 of the supply-side gas line 24 is the portion via the compressor 22. Portion D3 of the supply-side gas line 24 is the portion connected to the supply-side tank 21. Portion D3 of the supply-side gas line 24 is the portion in the path of the ship-side gas line 15 that is not connected to the ship-side tank. Portion D3 of the supply-side gas line 24 is an example of the supply-side gas line 24.

[0346] By closing valves V2, V3, and V6 and opening valve V5, a path is formed from section D3 of the supply-side gas pipeline 24 to the first ship-side tank 11-1, allowing sequential passage through section B2 of the supply-side liquid pipeline 23 and the ship-side liquid pipeline 14. Compressor 22 compresses ammonia gas from the supply-side tank 21. The ammonia gas compressed by compressor 22 flows towards the first ship-side tank 11-1, pushing out the liquefied ammonia remaining in section B2 of the supply-side liquid pipeline 23 and the ship-side liquid pipeline 14.

[0347] The fourth example of the loading operation method will be explained.

[0348] The fourth example is an instance where the ammonia gas from the ship's side tank is compressed using compressor 22 after the method of switching the ship's side tank is used.

[0349] The fourth example includes processes 9G to 9H, which will be described later. During processes 9G to 9H, compressor 22 continuously compresses ammonia gas.

[0350] Figure 18 This is the fourth example diagram used to illustrate the loading operation method.

[0351] The opening and closing states of the valves before the start of the fourth example are the ninth opening and closing state mentioned above. Furthermore, the configuration of the valves and pipelines in tanker truck 2 differs from... Figure 1 The configurations differ in different parts.

[0352] Here, as a fourth example, the following operation will be explained: while pressurizing the ammonia gas supplied from the shipside tank using compressor 22, the ammonia gas is supplied to the liquid pipeline without passing through the supply side tank 21, thereby pressurizing the liquefied ammonia remaining in the liquid pipeline into the shipside tank.

[0353] (Process 9G)

[0354] Similar to process 9A, it is indicated that if the remaining amount of liquefied ammonia stored in the supply-side tank 21 reaches the specified amount and ammonia gas is mixed into the liquefied ammonia, then communication will be made.

[0355] (Process 9H)

[0356] Ammonia gas is used to pressurize the liquefied ammonia remaining in the supply-side liquid line 23 and the ship-side liquid line 14 into the first ship-side tank 11-1. Here, valve V3 is closed. Valve EV2 is closed. Valve V5 is opened. The connecting portion of the supply-side gas line 24 from the end connected to the ship-side gas line 15 to the closed valve EV2 is called portion D4. Portion D4 of the supply-side gas line 24 is the portion via the compressor 22. Portion D4 of the supply-side gas line 24 is the portion that is not connected to the supply-side tank 21, defined by the closure of valve EV2. Portion D4 of the supply-side gas line 24 is the portion connected to the ship-side tank within the path of the ship-side gas line 15. Portion D4 of the supply-side gas line 24 is an example of the supply-side gas line 24.

[0357] By closing valves V3 and EV2 and opening valve V5, a path is formed between portion D4 of the supply-side gas line 24 and the first ship-side tank 11-1, allowing sequential passage through portion B2 of the supply-side liquid line 23 and the ship-side liquid line 14. Compressor 22 compresses ammonia gas from the ship-side tank. The ammonia gas compressed by compressor 22 flows towards the first ship-side tank 11-1, pushing out the liquefied ammonia remaining in portion B2 of the supply-side liquid line 23 and the ship-side liquid line 14.

[0358] According to the loading operation method, during the replenishment of liquefied ammonia, ammonia gas can be used to pressurize the liquefied ammonia remaining in the supply-side liquid pipeline 23 and the ship-side liquid pipeline 14 into the first ship-side tank 11-1.

[0359] (10) Loading operation completion method

[0360] The refueling method includes the method for completing the loading operation.

[0361] The loading operation completion method is a method used to complete the loading operation described above.

[0362] The loading operation is completed through processes 10A to 10K, which will be described later.

[0363] Figure 19 This is a diagram used to illustrate how the loading operation is completed.

[0364] Here, as a method for completing the loading operation, a first example of the method for completing the loading operation will be described. The opening and closing states of each valve before the start of the loading operation completion method are the ninth opening and closing states described above.

[0365] (Process 10A)

[0366] Close valve 1V15. For example, close valve 1V15 when the pressure in supply-side tank 21 is slightly higher than the pressure in the first-side tank 11-1. This is to prevent backflow.

[0367] (Process 10B)

[0368] This stops the operation of compressor 22.

[0369] (Process 10C)

[0370] Close valves EV2 and EV1.

[0371] (Process 10D)

[0372] Close valve V12.

[0373] (Process 10E)

[0374] Close valve V13.

[0375] (Process 10F)

[0376] Close valve V3. Confirm that valve V6 is closed.

[0377] (Process 10G)

[0378] Close valve V2.

[0379] (Process 10H)

[0380] Close valve V1.

[0381] (Process 10I)

[0382] Close valves 1V18 and 2V18.

[0383] (Process 10J)

[0384] Close valves V16 and V19. Closing valve V16 creates portion A1 of the aforementioned shipside liquid line 14. Closing valve V19 creates portion C1 of the shipside gas line 15.

[0385] (Process 10K)

[0386] Verify the side tanks. For example, verify the pressure and capacity of the side tanks.

[0387] The opening and closing status of each valve after the loading operation is completed is called the tenth opening and closing status. The tenth opening and closing status is described below.

[0388] The valves that are open in vessel 1 are valve V17 and valve V20. The valves that are closed in vessel 1 are valve V16, valve V19, valve V21, valve V32, valve V47, valve V48, valve V51, valve 1V15, valve 2V15, valve 1V18, valve 2V18, valve VN17, and valve VN18.

[0389] The valves that are not open in tanker truck 2 are valves V1, V2, V3, V5, V6, V12, V13, EV1, and EV2.

[0390] (11) Combustion treatment method for residual gas in pipeline

[0391] The refueling method includes a combustion treatment method for residual gases in the pipeline.

[0392] The combustion treatment method for residual gas in the pipeline is a method for burning the ammonia gas remaining in the pipeline after the supply of liquefied ammonia from the supply-side tank 21 to the ship-side tank.

[0393] The combustion treatment method for residual gas in the pipeline includes steps 11A to 11D, which will be described later.

[0394] Figure 20 This diagram illustrates a method for treating residual gases within a pipeline through combustion.

[0395] Before the combustion treatment method for residual gas in the pipeline begins, the opening and closing states of each valve are the tenth opening and closing state mentioned above.

[0396] (Process 11A)

[0397] Open valve V21. By opening valve V21, the state between portion A1 of the shipside liquid line 14 and portion C1 of the shipside gas line 15 is changed from a non-connected state to a connected state. Thus, the aforementioned object portion is formed.

[0398] (Process 11B)

[0399] Open valve V48. By opening valve V48, the state between the object section and GCU12 is changed from a non-connected state to a connected state. Ammonia gas in the object section flows from the object section to GCU12.

[0400] (Process 11C)

[0401] Start the operation of GCU12. The ammonia gas flowing from the target section to GCU12 is then combusted within GCU12.

[0402] (Process 11D)

[0403] After opening valve V48 and allowing the ammonia gas flowing from the target section to GCU12 to burn in GCU12, valve V48 is closed. By closing valve V48, the state between the target section and GCU12 is changed from a connected state to a disconnected state. For example, valve V48 can be closed based on changes in the combustion conditions in GCU12, as described above. Alternatively, valve V48 can be closed based on the amount of ammonia burned in GCU12. Valve V48 can also be closed based on changes in the gas concentration in the target section.

[0404] The opening and closing status of each valve after the combustion treatment of residual gas in the pipeline is completed is called the eleventh opening and closing status. The eleventh opening and closing status is described below.

[0405] The valves that are open in vessel 1 are valves V17, V20, and V21. The valves that are closed in vessel 1 are valves V16, V19, V32, V47, V48, V51, 1V15, 2V15, 1V18, 2V18, VN17, and VN18.

[0406] The valves that are not open in tanker truck 2 are valves V1, V2, V3, V5, V6, V12, V13, EV1, and EV2.

[0407] According to the combustion treatment method for residual gas in the pipeline, the ammonia gas remaining in the shipside liquid pipeline 14 and shipside gas pipeline 15 can be treated after the replenishment of liquefied ammonia. Through this process after the replenishment of liquefied ammonia, the supply-side liquid pipeline 23 and supply-side gas pipeline 24 can be safely disconnected from the shipside liquid pipeline 14 and shipside gas pipeline 15 after the N2 purification method in the pipeline described later.

[0408] (12) N2 purification method in pipeline

[0409] The filling method includes N2 purification methods within the pipeline.

[0410] The N2 purification method in the pipeline is a method of purifying the ammonia remaining in the pipeline with nitrogen after the replenishment of liquefied ammonia from the supply-side tank 21 to the ship-side tank.

[0411] The N2 purification methods in the pipeline include processes 12A to 12P.

[0412] Figure 21 and Figure 22 This diagram illustrates the N2 purification method within the pipeline.

[0413] Figure 21 This diagram is related to processes 12A to 12G. Figure 22 It is a diagram related to processes 12H to 12P.

[0414] Before the N2 purification method in the pipeline begins, the opening and closing states of each valve are as described in the eleventh opening and closing state above.

[0415] (Process 12A)

[0416] After valve V48 is closed in step 11D, valves VN17 and VN18 are opened. By opening valves VN17 and VN18, nitrogen gas is supplied from nitrogen cylinder 13 to the target section. Nitrogen gas is supplied to the target section until the pressure in the target section reaches or exceeds a third threshold. For example, the third threshold is 0.1 MPaG, but it is not limited to this. The third threshold can be set appropriately.

[0417] (Process 12B)

[0418] Close valve VN18. In a specific example, valve VN18 is closed after the pressure in the target section exceeds the third threshold due to the supply of nitrogen. By closing valve VN18, the supply of nitrogen to the target section is stopped.

[0419] (Process 12C)

[0420] After nitrogen is supplied to the target section, valve V48 is opened. In a specific example, valve V48 is opened after the pressure in the target section reaches or exceeds the third threshold due to the supply of nitrogen. By opening valve V48, the state between the target section and GCU12 is changed from a non-connected state to a connected state. Nitrogen in the target section flows from the target section to GCU12. If ammonia remains in the target section, the ammonia remaining in the target section flows from the target section to GCU12. If liquefied ammonia remains in the target section, the liquefied ammonia remaining in the target section flows from the target section to GCU12. The liquefied ammonia may sometimes vaporize during its flow from the target section to GCU12. GCU12 is capable of burning the nitrogen and ammonia flowing to GCU12. GCU12 is capable of burning the ammonia after vaporizing the liquefied ammonia flowing to GCU12.

[0421] (Process 12D)

[0422] Start the operation of GCU12. The gas flowing from the target section to GCU12 is then combusted within GCU12.

[0423] (Process 12E)

[0424] After opening valve V48 and after the gas flowing from the target section to GCU12 has burned in GCU12, valve V48 is closed. By closing valve V48, the state between the target section and GCU12 is changed from a connected state to a disconnected state. For example, valve V48 can be closed based on changes in the combustion conditions in GCU12, as described above. Alternatively, valve V48 can be closed based on the amount of ammonia burned in GCU12. Valve V48 can also be closed based on changes in the gas concentration in the target section.

[0425] (Process 12F)

[0426] Open valve V32. Measure the gas concentration in the target section. After measuring the gas concentration in the target section, close valve V32. For example, the gas concentration in the target section may be ammonia, but it is not limited to this.

[0427] (Process 12G)

[0428] If the gas concentration in the target section meets the second criterion after closing valve V48, close valves VN17 and VN18 to stop the supply of nitrogen to the target section. For example, meeting the second criterion means that the ammonia concentration in the target section is below 25 ppm, but it is not limited to this. If the gas concentration in the target section does not meet the second criterion after closing valve V48, repeat steps 12A to 12G until the gas concentration in the target section meets the second criterion.

[0429] (Process 12H)

[0430] Close valve V17. Close valve V20.

[0431] (Process 12I)

[0432] Open valve V47. The section of the ship-side liquid line 14 from the closed valve V16 to the closed valves 1V15 and 2V15 is referred to as section A3. Section A3 of the ship-side liquid line 14 is a section that is not connected to the ship-side tank, defined by the closure of valves 1V15 and 2V15. Section A3 of the ship-side liquid line 14 is a section that is not connected to the ship-side gas line 15. Section A3 of the ship-side liquid line 14 is a section that is not connected to the supply-side liquid line 23. Section A3 of the ship-side liquid line 14 is an example of the ship-side liquid line 14.

[0433] By opening valve V47, the connection between portion A3 of the shipside liquid line 14 and GCU12 is changed from a non-connected state to a connected state. The liquefied ammonia remaining in portion A3 of the shipside liquid line 14 flows from portion A3 to GCU12. The liquefied ammonia may sometimes vaporize during this flow from portion A3 to GCU12.

[0434] (Process 12J)

[0435] The ammonia flowing from section A3 of the ship-side liquid line 14 to GCU12 is combusted in GCU12. GCU12 is capable of combusting the ammonia gas formed by the vaporization of liquefied ammonia during the flow from section A3 of the ship-side liquid line 14 to GCU12. GCU12 is capable of combusting the ammonia gas after the liquefied ammonia flowing from section A3 of the ship-side liquid line 14 to GCU12 has been vaporized. The pressure of section A3 of the ship-side liquid line 14 is reduced by the combustion of ammonia based on GCU12.

[0436] (Process 12K)

[0437] After the pressure in section A3 of the shipside liquid line 14 falls below the fourth threshold, valve V47 is closed. Closing valve V47 changes the connection between section A3 of the shipside liquid line 14 and GCU12 from a connected state to a disconnected state. For example, the fourth threshold is 0.01 MPaG, but it is not limited to this. The fourth threshold can be set appropriately. Furthermore, valve V47 can also be closed based on changes in the combustion conditions in GCU12. Valve V47 can also be closed based on the amount of ammonia burned in GCU12. Valve V47 can also be closed based on changes in the gas concentration in section A3 of the shipside liquid line 14.

[0438] (Process 12L)

[0439] The pressure of section A3 of the shipside liquid line 14 is monitored. This is because if liquefied ammonia remains in section A3 of the shipside liquid line 14, the pressure in section A3 of the shipside liquid line 14 will increase due to the vaporization of the liquefied ammonia.

[0440] (Process 12M)

[0441] Open valve V51. The section of the ship-side gas line 15 from the closed valve V19 to the closed valves 1V18 and 2V18 is referred to as section C4. Section C4 of the ship-side gas line 15 is a section that is not connected to the ship-side tank, defined by the closure of valves 1V18 and 2V18. Section C4 of the ship-side gas line 15 is a section that is not connected to the ship-side liquid line 14. Section C4 of the ship-side gas line 15 is a section that is not connected to the supply-side gas line 24. Section C4 of the ship-side gas line 15 is an example of the ship-side gas line 15.

[0442] By opening valve V51, the state between portion C4 of the shipside gas line 15 and GCU12 is changed from a non-connected state to a connected state. The ammonia gas remaining in portion C4 of the shipside gas line 15 flows from portion C4 of the shipside gas line 15 to GCU12.

[0443] (Process 12N)

[0444] Ammonia flowing from a portion of the C4 in the ship-side gas line 15 to the GCU12 is combusted in the GCU12. The GCU12 enables the ammonia flowing from the portion of the C4 in the ship-side gas line 15 to the GCU12 to combust. The pressure of the portion of C4 in the ship-side gas line 15 is reduced by the combustion of ammonia based on the GCU12.

[0445] (Process 120)

[0446] After the pressure in section C4 of the shipside gas line 15 falls below the fifth threshold, valve V51 is closed. Closing valve V51 changes the connection between section C4 of the shipside gas line 15 and GCU12 from a connected state to a disconnected state. For example, the fifth threshold is 0.01 MPaG, but it is not limited to this. The fifth threshold can be set appropriately. Furthermore, valve V51 can also be closed based on changes in the combustion conditions in GCU12. Valve V51 can also be closed based on the amount of ammonia burned in GCU12. Valve V51 can also be closed based on changes in the gas concentration in section C4 of the shipside gas line 15.

[0447] (Process 12P)

[0448] The pressure of a portion of C4 in the shipside gas line 15 is monitored. This is because if reliquefied ammonia remains in a portion of C4 in the shipside gas line 15, the pressure of that portion of C4 will rise due to the vaporization of the ammonia.

[0449] According to the combustion treatment method for residual gas in the pipelines, the ammonia remaining in the ship-side liquid pipeline 14 and ship-side gas pipeline 15 can be treated after the replenishment of liquefied ammonia. In particular, nitrogen can be used to treat the ammonia in the portion of the ship-side liquid pipeline 14 near the first end 141 and the portion of the ship-side gas pipeline 15 near the first end 151. As a result, the ammonia concentration in the portion of the ship-side liquid pipeline 14 near the first end 141 and the portion of the ship-side gas pipeline 15 near the first end 151 can be reduced to a level that will not cause adverse effects on human health. Therefore, the supply-side liquid pipeline 23 and the supply-side gas pipeline 24 can be safely disconnected from the ship-side liquid pipeline 14 and the ship-side gas pipeline 15.

[0450] (Other implementation methods)

[0451] In the above embodiment, the example described is the relationship between the ship-side tank of the ship 1 and the supply-side tank 21 of the tank truck 2, but it is not limited to this. The above embodiment can also be applied to any tank.

[0452] Depending on the configuration of the pipelines and valves, the actions described in the above embodiments that are achieved by opening a valve can sometimes also be achieved by closing a valve. Similarly, depending on the configuration of the pipelines and valves, the actions described in the above embodiments that are achieved by closing a valve can sometimes also be achieved by opening a valve. Therefore, the valve opening and closing described in the above embodiments are examples of valve operation.

[0453] In the above embodiments, the term "part of the ship-side liquid line 14" means "part of the ship-side liquid line 14". The term "part of the ship-side gas line 15" means "part of the ship-side gas line 15". The term "part of the supply-side liquid line 23" means "part of the supply-side liquid line 23". The term "part of the supply-side gas line 24" means "part of the supply-side gas line 24".

[0454] The methods described above are illustrated using human intervention as an example, but are not limited to this. Some or all of the methods described above can also be executed by the processing circuitry of a computer constituting the device. The processing circuitry includes one or more circuits that perform multiple processes. For example, the circuitry is a processor such as a CPU (Central Processing Unit). The processing circuitry expands the program stored in a storage device such as an HDD (Hard Disc Drive) provided with the device into RAM (Random Access Memory). The processing circuitry can perform various processes by executing the program expanded into RAM.

[0455] The pipelines in the above embodiments can also be distinguished by using ordinal numbers. For example, the shipside liquid pipeline 14, the shipside gas pipeline 15, the connecting pipeline 16, and the combustion pipeline 17 are examples of the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline, respectively.

[0456] Furthermore, the present invention is not limited to the embodiments described above, and various modifications can be made during implementation without departing from its spirit. Additionally, the embodiments can be appropriately combined and implemented, in which case the combined effect can be obtained. Moreover, various inventions are included in the above embodiments, and various inventions can be extracted by selecting combinations from the disclosed multiple constituent elements. For example, if the problem can be solved and the effect can be obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiments, the structure after deleting those constituent elements can be extracted as an invention.

[0457] Explanation of reference numerals in the attached figures

[0458] 1…ship, 2…tanker truck, 11-1…first shipside tank, 11-2…second shipside tank, 12…GCU, 13…nitrogen cylinder, 14…shipside liquid pipeline, 15…shipside gas pipeline, 16…connection pipeline, 17…combustion pipeline, 18…nitrogen pipeline, 19…concentration detection pipeline, 21…supply-side tank, 22…compressor, 23…supply-side liquid pipeline, 24…supply-side gas pipeline, 141…first end, 142-1…second end, 142-2…second end, 151…first end, 152-1…second end, 152-2…second end, V1 V2 V3 V5 V6 V12 V13 V16 V17 V19 V20 V21 V32 V47 V48 V51 1V15 2V15 1V18 2V18 VN17 VN18 EV1 EV2… valve.

Claims

1. A type of ship, wherein, The vessel is equipped with: Side tanks; Combustion section; A first pipeline is used to transport liquefied ammonia from the supply-side tank to the ship-side tank; The second pipeline is used to transport ammonia from the shipside tank to the supply-side tank; A third pipeline connects the first pipeline and the second pipeline; as well as A fourth conduit connects at least one of the first conduit and the second conduit to the combustion section.

2. A method for use in a ship, said ship being the ship of claim 1, wherein, Before replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: The valve installed in the third pipeline is opened to change the state between the first pipeline and the second pipeline from a non-connected state to a connected state; Nitrogen gas is supplied to the connected portion of the object, including the first pipeline, the second pipeline, and the third pipeline. as well as After supplying nitrogen to the target section, the valve located in the fourth pipeline is opened to change the state between the target section and the combustion section from a non-connected state to a connected state.

3. The method according to claim 2, wherein, The object portion includes: a portion of the first pipeline that is not connected to the shipside tank, which is divided by the closure of a valve located in the first pipeline; a portion of the second pipeline that is not connected to the shipside tank, which is divided by the closure of a valve located in the second pipeline; and the third pipeline.

4. The method according to claim 2, wherein, The supply includes: supplying nitrogen gas to the object portion until the pressure of the object portion reaches or exceeds a first threshold. Opening the valve located in the fourth pipeline includes: opening the valve located in the fourth pipeline after the pressure in the target section reaches or exceeds the first threshold. The method further comprises: closing the valve provided in the fourth pipeline after the pressure in the object portion becomes below a second threshold lower than the first threshold.

5. The method according to claim 4, wherein, The method further comprises: when the gas concentration of the target portion does not meet the benchmark after the valve in the fourth pipeline is closed, repeatedly performing the supply, opening the valve in the fourth pipeline, and closing the valve in the fourth pipeline until the gas concentration of the target portion meets the benchmark.

6. A method for use in a ship, said ship being the ship of claim 1, wherein, Before supplying liquefied ammonia from the supply-side tank to the ship-side tank, the method includes: opening a valve provided in the fourth pipeline to change the state between the second pipeline and the combustion section from a non-connected state to a connected state.

7. A method for use in a ship, said ship being the ship of claim 1, wherein, Before replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: The valve installed in the third pipeline is opened to change the state between the first pipeline and the second pipeline from a non-connected state to a connected state; as well as The valve located in the fourth pipeline is opened to change the state between the first pipeline and the combustion section from a non-connected state to a connected state.

8. A method for use in a ship, said ship being the ship of claim 1, wherein, Before replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: The valve installed in the third pipeline is shut off to change the state between the first pipeline and the second pipeline from a connected state to a disconnected state. Open the valve located in the second pipeline to change the state between the gas pipeline connected to the supply-side tank and the ship-side tank from a non-connected state to a connected state. as well as The valve located in the first pipeline is opened to change the state between the liquid pipeline connected to the supply-side tank and the ship-side tank from a non-connected state to a connected state.

9. The method according to claim 8, wherein, During the replenishment of liquefied ammonia from the supply-side tank to the ship-side tank, the liquid pipeline and the liquefied ammonia in the first pipeline are transported to the ship-side tank by ammonia gas compressed by a compressor.

10. A method for use in a ship, said ship being the ship of claim 1, wherein, After replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: The valve installed in the third pipeline is opened to change the state between the first pipeline and the second pipeline from a connected state to a disconnected state; as well as The valve located in the fourth pipeline is opened to change the state between the first pipeline and the combustion section from a non-connected state to a connected state.

11. A method for use in a ship, said ship being the ship of claim 1, wherein, After replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: Nitrogen gas is supplied to the object portion including the first pipeline, the second pipeline, and the third pipeline; and After supplying nitrogen to the target section, the valve located in the fourth pipeline is opened to change the state between the target section and the combustion section from a non-connected state to a connected state.

12. The method according to claim 11, wherein, The method also has the following characteristics: After opening the valve located in the fourth pipeline, the valve located in the fourth pipeline is closed; and If the gas concentration in the target area does not meet the benchmark after the valve in the fourth pipeline is closed, the supply, opening and closing of the valve in the fourth pipeline are repeated until the gas concentration in the target area meets the benchmark.

13. A method for use in a ship, said ship being the ship of claim 1, wherein, After replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: Open the valve located in the fourth pipeline to change the state between the first pipeline and the combustion section from a non-connected state to a connected state; and Once the pressure in the first pipeline falls below a threshold, the valve in the fourth pipeline will be closed.

14. A method for use in a ship, said ship being the ship of claim 1, wherein, After replenishing liquefied ammonia from the supply-side tank to the ship-side tank, the method comprises: Open the valve located in the fourth pipeline to change the state between the second pipeline and the combustion section from a non-connected state to a connected state; and Once the pressure in the second pipeline falls below a threshold, the valve in the fourth pipeline will be closed.

15. The method according to any one of claims 6, 7, 10, and 11, wherein, The method further includes: closing the valve installed in the fourth pipeline based on changes in the combustion state in the combustion section.

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