Multipurpose clean fuel filling and CO2 receiving ship and method

Abstract

The invention belongs to the technical field of ships, and provides a multipurpose clean fuel filling and CO2 receiving ship and method. The multipurpose clean fuel filling and CO2 receiving ship comprises a C-shaped tank, a lightering pump, a filling connector, a receiving connector, a GCU unit and a recovery valve, and the operation modes of the multipurpose clean fuel filling and CO2 receiving ship comprise a methanol filling mode, an ammonia filling mode and a CO2 receiving mode. The characteristic that the storage conditions of ammonia, methanol and liquid CO2 are similar is ingeniously utilized, a methanol filling command, an ammonia filling command and a CO2 receiving command can be flexibly coped, fuel is filled for an ammonia power-driven ship and a methanol power-driven ship, and CO2 can also be received. The multi-purpose ship is achieved, the investment cost and the operation cost of independently configuring the fuel filling ship or the CO2 receiving ship are greatly reduced, and the good economical efficiency is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of ships, and in particular relates to a multi-purpose clean fuel filling and CO2 receiving method. Background Art

[0002] Currently, the International Maritime Organization (IMO) has increasingly strict standards for ship exhaust emissions, forcing more and more ships to adopt clean energy as a power source. Among them, ammonia and methanol are ideal clean energy sources for ships. Methanol combustion produces relatively less CO2, and ammonia combustion can achieve carbon-free emissions, which are highly favored by the shipping industry.

[0003] Ammonia and methanol are generally stored in liquid form on ships. The common storage conditions for liquid ammonia are -33°C at normal pressure; methanol is liquid at normal temperature and pressure, and its freezing point is -97.6°C. Fuel-powered ships such as marine fuel, LNG, and methanol will produce CO2 when sailing. In order to reduce CO2 emissions, decarbonization devices can be used to capture and separate CO2 in ship exhaust gas, and then liquefy it and store it on the ship. At present, the common way to store CO2 on ships is semi-cold and semi-pressure. The container commonly used for semi-cold and semi-pressure storage of CO2 is C-type tank. The working pressure of this C-type tank is between 0.7MPa and 2.0MPa, and the working temperature is between -50℃ and -20℃. It can be seen that C-type tanks not only meet the storage conditions of CO2, but also meet the storage conditions of ammonia and methanol.

[0004] Ship fuel bunkering ships are ships that mainly supply fuel to merchant ships, usually near ports or anchorages. With the diversification of clean energy, there are more and more types of fuel for ships. Different ships may need to burn different types of fuel, such as marine fuel oil, LNG, and emerging clean fuels such as methanol and ammonia. However, current bunkering ships can often only provide a single type of fuel bunkering service. For traditional fuel ships or LNG-powered ships, there are a large number of such ships on the market, and the number of ships that need to be refueled is also large. In this case, building a traditional fuel bunkering ship or LNG fuel bunkering ship alone has good economic benefits. However, the number of ammonia-powered ships and methanol-powered ships on the market is relatively small, so there are not many businesses that provide bunkering services for ammonia fuel bunkering ships or methanol bunkering ships. Therefore, if a new ammonia fuel bunkering ship or methanol fuel bunkering ship is built for it alone, not only will the cost of the bunkering ship be high, but the frequency of use of the bunkering ship will also be low, which will cause serious waste of resources.

[0005] In addition, due to the strict carbon emission standards imposed by the International Maritime Organization on ship exhaust, many ships are beginning to need to be equipped with decarbonization equipment. The ship's decarbonization equipment captures CO2 and liquefies it before storing it on board the ship. However, storing CO2 in CO2 storage tanks on board the ship will not only increase the ship's load, but also occupy more valuable space on the ship's deck, reducing the ship's cargo capacity and transportation efficiency. Therefore, once the ship arrives at the port or anchorage, it is necessary to promptly unload the CO2 using a special CO2 receiving ship. However, there are currently few commercial ships equipped with decarbonization equipment, so designing a special CO2 receiving ship has no economies of scale, is very costly, and is of little significance.

[0006] Based on the above problems, if a multi-purpose clean fuel bunkering ship and CO2 receiving ship can be designed to be combined into one, it can not only refuel ammonia-powered ships and methanol-powered ships on the voyage, but also serve as a receiving ship to receive CO2, realizing multiple functions. This can greatly reduce the manufacturing cost and operating cost of the ship, and has good economy and practicality. Summary of the invention

[0007] The purpose of the present invention is to address the above-mentioned problems and to provide a multi-purpose clean fuel filling and CO2 receiving ship and method.

[0008] The first purpose of the present invention is to propose a multi-purpose clean fuel filling and CO2 receiving ship based on the above problems, hereinafter referred to as a multi-purpose ship, which includes: a barge pump, a C-type tank, a GCU unit, a receiving connector, a filling connector, and a recovery valve.

[0009] The C-type tank is located in the cargo hold of the ship. It is a semi-cold and semi-pressure C-type storage tank. It is designed to withstand a minimum temperature of -50°C and a maximum pressure of 2MPa. The barge pump is located in the C-type tank. The GCU unit is connected to the C-type tank through a pipeline. A recovery valve is provided on the pipeline. A pipeline is provided above the C-type tank and is connected to the receiving joint. The filling joint is located on the pipeline connected to the barge pump.

[0010] The working principle of the multipurpose vessel of the present invention is: the multipurpose vessel is connected to the interface on the shore-based storage tank pipeline through the receiving joint to load the corresponding fuel into the C-type tank, or is connected to the interface on the CO2 storage tank pipeline on the ship that captures CO2 to receive CO2; it is connected to the interface on the fuel tank pipeline of the receiving ship through the filling joint to fill the receiving ship with fuel.

[0011] Multipurpose vessels have three operating modes: methanol bunkering mode, ammonia bunkering mode and CO2 receiving mode.

[0012] Methanol refueling mode: The multipurpose ship docks at the fuel supply terminal, connects the receiving connector on the multipurpose ship with the pipeline interface on the shore-based methanol storage tank, and loads the methanol fuel from the shore-based methanol storage tank into the C-type tank. The amount of fuel loaded in the C-type tank is equal to the amount of fuel planned to be refueled to the methanol-powered ship. After the methanol fuel is loaded, the multipurpose ship sails to the sea area near the methanol-powered ship, and the refueling connector on the multipurpose ship is connected to the interface on the refueling pipeline of the methanol fuel tank of the methanol-powered ship. The transfer pump works to transfer all the methanol fuel in the C-type tank to the methanol fuel tank.

[0013] Ammonia refueling mode: The multipurpose ship docks at the fuel supply terminal, connects the receiving connector on the multipurpose ship with the pipeline interface on the shore-based ammonia storage tank, and loads ammonia fuel from the shore-based ammonia storage tank into the C-type tank. The amount of fuel loaded in the C-type tank is equal to the amount of fuel planned to be refueled to the ammonia-powered ship. After the ammonia fuel is loaded, the multipurpose ship sails to the sea area near the ammonia-powered ship, and the refueling connector on the multipurpose ship is connected to the interface of the pipeline on the ammonia fuel tank of the ammonia-powered ship. The transfer pump works to transfer all the ammonia fuel in the C-type tank to the ammonia fuel tank.

[0014] CO2 receiving mode: The multipurpose vessel sails to the sea area near the ship equipped with the decarbonization device, connects the receiving connector on the multipurpose vessel with the interface on the CO2 storage tank of the ship equipped with the decarbonization device, receives the CO2 stored in the ship, and then the multipurpose vessel sends the CO2 in the C-type tank to land for recycling and treatment.

[0015] The second object of the present invention is to propose a method for using the multi-purpose ship based on the above multi-purpose ship. The method aims to introduce how the multi-purpose ship can efficiently switch between different operation modes under different circumstances.

[0016] The operation process of the multi-purpose ship of the present invention is divided into three situations:

[0017] The first case: When the multipurpose ship receives a refueling order from an offshore ammonia-powered ship, the multipurpose ship goes to the fuel supply terminal, executes the "ammonia refueling mode" operation mode, and completes the refueling order. At this time, if the multipurpose ship needs to execute the next order, the multipurpose ship switches to the corresponding operation mode. If the multipurpose ship does not need to execute the next order, the multipurpose ship returns to the fuel supply terminal. At the fuel supply terminal, the multipurpose ship can be connected to the shore-based CO2 tank through the receiving connector, open the recovery valve, and pass the CO2 in the shore-based CO2 tank into the C-type tank to send the residual ammonia in the C-type tank to the GCU unit for combustion.

[0018] The second situation: when the multipurpose ship receives the refueling order from the offshore methanol-powered ship, the multipurpose ship goes to the fuel supply terminal and executes the "methanol refueling mode" operation mode. After completing the refueling order, if the volume of CO2 stored on the ship is large, the multipurpose ship can switch to the "CO2 receiving mode" operation mode to unload the CO2 stored on the methanol-powered ship to the C-type tank of the multipurpose ship; if the volume of CO2 stored on the ship is small, the multipurpose ship does not need to switch to the "CO2 receiving mode" operation mode. At this time, if the multipurpose ship needs to execute the next order, the multipurpose ship switches to the corresponding operation mode. If the multipurpose ship does not need to execute the next order, the multipurpose ship returns to the fuel supply terminal. At the fuel supply terminal, the multipurpose ship can be connected to the shore-based CO2 tank through the receiving connector, open the recovery valve, and pass the CO2 in the shore-based CO2 tank into the C-type tank to send the residual methanol vapor in the C-type tank to the GCU unit 3 for combustion.

[0019] The third situation: When the multipurpose ship receives the CO2 receiving command, it sails to the sea area near the ship equipped with the decarbonization device, executes the "CO2 receiving mode" operation mode, and completes the receiving command. At this time, if the multipurpose ship needs to execute the next command, the multipurpose ship switches to the corresponding operation mode. If the multipurpose ship does not need to execute the next command, the multipurpose ship returns to the fuel supply terminal.

[0020] Beneficial effects of the present invention:

[0021] 1. The present invention cleverly utilizes the similar storage conditions of ammonia, methanol and liquid CO2, and proposes a multi-purpose clean fuel bunkering and CO2 receiving ship. The multi-purpose ship designed by the present invention can be used as a fuel bunkering ship to flexibly fill different fuels, and can also be used as a CO2 receiving ship to receive liquid CO2 captured by ships, thus realizing multiple uses of one ship, greatly reducing the investment cost and operating cost of building a separate fuel bunkering ship or CO2 receiving ship, and having good economic efficiency.

[0022] 2. The multi-purpose ship designed by the present invention can meet the refueling needs of ammonia-powered ships or methanol-powered ships at the same time, without the need to build new ammonia-fueling ships or methanol-fueling ships separately, thus avoiding the serious waste of resources caused by the low frequency of use of traditional ammonia-fueling ships or methanol-fueling ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A system diagram of a multi-purpose ship receiving fuel at a fuel supply terminal in the present invention;

[0024] Figure 2 This is a schematic diagram of the methanol filling mode of the present invention;

[0025] Figure 3 This is a schematic diagram of an ammonia filling mode of the present invention;

[0026] Figure 4 This is a schematic diagram of the CO2 receiving mode of the present invention;

[0027] Figure 5 This is an operation flow chart of the multi-purpose ship of the present invention;

[0028] In the attached figure: 1. Transfer pump; 2. C-type tank; 3. GCU unit; 4. Receiving connector; 5. Filling connector; 6. CO2 storage tank; 7. Methanol fuel tank; 8. Ammonia fuel tank; 9. Recovery valve; 10. Shore-based ammonia storage tank; 11. Shore-based methanol storage tank; 12. Shore-based CO2 tank. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, the present invention proposes a multi-purpose clean fuel filling and CO2 receiving ship, hereinafter referred to as a multi-purpose ship, which includes: a barge pump 1, a C-type tank 2, a GCU unit 3, a receiving connector 4, a filling connector 5, and a recovery valve 9.

[0031] The C-type tank 2 is located in the cargo hold of the ship and is a semi-cold and semi-pressure C-type storage tank. The minimum temperature designed to withstand is -50°C and the maximum pressure is 2MPa. The barge pump 1 is located in the C-type tank 2. The GCU unit 3 is connected to the C-type tank 2 through a pipeline. A recovery valve 9 is provided on the pipeline. A pipeline is provided above the C-type tank 2 and is connected to the receiving joint 4. The filling joint 5 is located on the pipeline connected to the barge pump 1.

[0032] Multipurpose vessels have three operating modes: methanol bunkering mode, ammonia bunkering mode and CO2 receiving mode.

[0033] Methanol filling mode: Figure 2 As shown in the figure, the specific operation process of methanol bunkering mode for multi-purpose ships is as follows: Figure 1 As shown, the multipurpose ship is docked at the fuel supply terminal, the receiving connector 4 on the multipurpose ship is connected to the pipeline interface on the shore-based methanol storage tank 11, and the methanol fuel is loaded from the shore-based methanol storage tank 11 into the C-type tank 2. The amount of fuel loaded in the C-type tank 2 is equal to the amount of fuel planned to be refueled to the methanol-powered ship. After the methanol fuel is loaded, the multipurpose ship sails to the sea area near the methanol-powered ship, such as Figure 2 As shown, the filling connector 5 on the multipurpose ship is connected to the interface of the pipeline on the methanol fuel tank 7 of the methanol-powered ship, and the transfer pump 1 works to transfer all the methanol fuel in the C-type tank 2 to the methanol fuel tank 7.

[0034] Ammonia injection mode: Figure 3As shown in the figure, the specific operation process of ammonia filling mode for multi-purpose ships is as follows: Figure 1 As shown, the multipurpose ship docks at the fuel supply terminal, connects the receiving connector 4 on the multipurpose ship to the pipeline interface on the shore-based ammonia storage tank 10, and then loads the ammonia fuel from the shore-based ammonia storage tank 10 into the C-type tank 2. The amount of fuel loaded in the C-type tank 2 is equal to the amount of fuel planned to be refueled to the ammonia-powered ship. After the ammonia fuel is loaded, the multipurpose ship sails to the sea area near the ammonia-powered ship, as shown in FIG. Figure 3 As shown, the filling connector 5 on the multipurpose ship is connected to the interface of the pipeline on the ammonia fuel tank 8 of the ammonia-powered ship, and the transfer pump 1 works to transfer all the ammonia fuel in the C-type tank 2 to the ammonia fuel tank 8.

[0035] CO2 receiving mode: Figure 4 As shown, the specific operation process of the CO2 receiving mode of the multipurpose ship is as follows: the multipurpose ship sails to the sea area near the ship equipped with the decarbonization device, connects the receiving connector 4 on the multipurpose ship with the interface on the CO2 storage tank 6 of the ship equipped with the decarbonization device, receives the CO2 stored in the ship, and then the multipurpose ship sends the CO2 in the C-type tank 2 to land for recovery and treatment.

[0036] Among them, ships equipped with decarbonization devices refer to ships that emit CO2, such as marine fuel-powered ships, LNG-powered ships or methanol-powered ships equipped with decarbonization devices.

[0037] The second object of the present invention is to propose a method for using the multi-purpose ship based on the above multi-purpose ship. The method aims to introduce how the multi-purpose ship can efficiently switch between different operation modes under different circumstances.

[0038] like Figure 5 As shown, the operation process of the multi-purpose ship of the present invention is divided into three cases:

[0039] The first case: When the multipurpose ship receives a refueling order from an offshore ammonia-powered ship, the multipurpose ship goes to the fuel supply terminal, executes the "ammonia refueling mode" operation mode, and completes the refueling order. At this time, if the multipurpose ship needs to execute the next order, the multipurpose ship switches to the corresponding operation mode. If the multipurpose ship does not need to execute the next order, the multipurpose ship returns to the fuel supply terminal. At the fuel supply terminal, the multipurpose ship can be connected to the shore-based CO2 tank 12 through the receiving connector 4, open the recovery valve 9, and pass the CO2 in the shore-based CO2 tank 12 into the C-type tank 2, and the residual ammonia in the C-type tank 2 is sent to the GCU unit 3 for combustion.

[0040] The second situation: when the multipurpose ship receives the refueling order from the offshore methanol-powered ship, the multipurpose ship goes to the fuel supply terminal and executes the "methanol refueling mode" operation mode. After completing the refueling order, if the volume of CO2 stored on the ship is large, the multipurpose ship can switch to the "CO2 receiving mode" operation mode, unload the CO2 stored on the methanol-powered ship to the C-type tank 2 of the multipurpose ship, and use the multipurpose ship to receive the CO2 stored in the methanol-powered ship; if the volume of CO2 stored on the ship is small, the multipurpose ship does not need to switch to the "CO2 receiving mode" operation mode. At this time, if the multipurpose ship needs to execute the next order, the multipurpose ship switches to the corresponding operation mode. If the multipurpose ship does not need to execute the next order, the multipurpose ship returns to the fuel supply terminal. At the fuel supply terminal, the multipurpose ship can be connected to the shore-based CO2 tank 12 through the receiving connector 4, open the recovery valve 9, and pass the CO2 in the shore-based CO2 tank 12 into the C-type tank 2, and send the residual methanol vapor in the C-type tank 2 to the GCU unit 3 for combustion.

[0041] The third situation: When the multipurpose ship receives the CO2 receiving command, it sails to the sea area near the ship equipped with the decarbonization device, executes the "CO2 receiving mode" operation mode, and completes the receiving command. At this time, if the multipurpose ship needs to execute the next command, the multipurpose ship switches to the corresponding operation mode. If the multipurpose ship does not need to execute the next command, the multipurpose ship returns to the fuel supply terminal.

[0042] There are relatively few ammonia-powered ships and methanol-powered ships on the current market. Building a separate bunkering ship for them will increase the operating costs of the shipyard. At the same time, as the International Maritime Organization (IMO) has increasingly stringent carbon emission standards for ships, most merchant ships are equipped with decarbonization devices, which store the emitted CO2 on board by capturing and liquefying it. The CO2 stored on merchant ships requires a special CO2 receiving ship to receive and transfer it. The multi-purpose clean fuel bunkering ship and CO2 receiving ship proposed in the present invention can solve the above problems very well. The present invention cleverly utilizes the similar storage conditions of ammonia, methanol and CO2, and realizes the multi-purpose of one ship. It can be used as a bunkering ship to refuel methanol-powered ships and ammonia-powered ships, and can also be used as a receiving ship to receive the CO2 stored on the corresponding ships. It avoids the waste of resources and increased costs caused by the low frequency of use of separate ammonia bunkering ships, methanol bunkering ships and CO2 receiving ships.

[0043] In addition, after the multi-purpose ship completes a fuel filling command, if the next command received by the multi-purpose ship is to fill another fuel, since ammonia and methanol are both low-viscosity liquids, the fuel in the C-type tank 2 of the multi-purpose ship can be completely unloaded, and the two fuels are extremely volatile, and there will be no fuel residue from the previous operation in the C-type tank 2 of the multi-purpose ship, so the multi-purpose ship does not need to clear the C-type tank 2 before switching fuel loading, which simplifies the filling procedure of the multi-purpose ship and greatly improves the work efficiency of the multi-purpose ship. When the multi-purpose ship receives a filling order to load fuel, considering the transportation cost and transportation efficiency, it only needs to load the amount of fuel in the C-type tank 2 equal to the planned amount of fuel to be filled in the ammonia-powered ship or the methanol-powered ship. In this way, when the ammonia-powered ship or the methanol-powered ship is refueled, the fuel loaded in the C-type tank 2 of the multi-purpose ship can be completely unloaded.

[0044] The attached drawings of the present invention only show the connection and matching relationship between different components, and the actual positions on the ship are arranged at reasonable positions after comprehensive consideration based on the actual design requirements of the ship.

[0045] The above is only a preferred implementation mode of the present invention, but it is not limited to the above embodiments when it is implemented. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-purpose clean fuel bunkering and CO2 receiving ship, characterized by: It includes a transfer pump (1), a C-type tank (2), a GCU unit (3), a receiving joint (4), a filling joint (5), a CO2 storage tank (6), a methanol fuel tank (7), an ammonia fuel tank (8), a recovery valve (9), a shore-based ammonia storage tank (10), a shore-based methanol storage tank (11), and a shore-based CO2 tank (12). The C-type tank (2) is located in the cargo hold of the ship and is a semi-cold and semi-pressure C-type storage tank. The lowest temperature that the C-type tank (2) can withstand is -50°C and the highest pressure is 2MPa. The transfer pump (1) is located in the C-type tank (2). The GCU unit (3) is connected to the C-type tank (2) through a pipeline, and a recovery valve (9) is provided on the pipeline. A pipeline is provided above the C-type tank (2) and is connected to the receiving joint (4). The filling joint (5) is located on the pipeline connected to the transfer pump (1). The multi-purpose clean fuel filling and CO2 receiving ship has three operation modes, namely: methanol filling mode, ammonia filling mode and CO2 receiving mode.

2. A multi-purpose clean fuel bunkering and CO2 receiving ship according to claim 1, characterized in that: Methanol filling mode: the receiving connector (4) is connected to the pipeline interface on the shore-based methanol storage tank (11), and the methanol fuel is loaded from the shore-based methanol storage tank (11) into the C-type tank (2). The amount of fuel loaded in the C-type tank (2) is equal to the amount of fuel planned to be filled into the methanol-powered ship. The multi-purpose clean fuel filling and CO2 receiving ship travels to the sea area near the methanol-powered ship, and the filling connector (5) is connected to the methanol fuel tank (7), and all the methanol fuel in the C-type tank (2) is filled into the methanol fuel tank (7). Ammonia filling mode: the receiving connector (4) is connected to the pipeline interface on the shore-based ammonia storage tank (10), and the ammonia fuel is loaded from the shore-based ammonia storage tank (10) into the C-type tank (2). The amount of fuel loaded in the C-type tank (2) is equal to the amount of fuel planned to be filled into the ammonia-powered ship. The multi-purpose clean fuel filling and CO2 receiving ship travels to the sea area near the ammonia-powered ship, and the filling connector (5) is connected to the ammonia fuel tank (8), and all the ammonia fuel in the C-type tank (2) is filled into the ammonia fuel tank (8). CO2 receiving mode: The receiving connector (4) is connected to the interface on the CO2 storage tank (6) of the ship that captures CO2, and receives the CO2 stored in the ship. Then the multi-purpose clean fuel is refueled and the CO2 receiving ship sends the CO2 in the C-type tank (2) to land for recovery and treatment.

3. A method based on the multi-purpose clean fuel bunkering and CO2 receiving ship according to claim 1, characterized in that: The operation process of multi-purpose clean fuel bunkering and CO2 receiving ship is divided into three situations: The first case: the multi-purpose clean fuel bunkering and CO2 receiving ship receives the bunkering order from the offshore ammonia-powered ship, executes the "ammonia bunkering mode" operation mode, completes the bunkering order, and switches to the corresponding operation mode when the multi-purpose clean fuel bunkering and CO2 receiving ship needs to execute the next order. When the multi-purpose clean fuel bunkering and CO2 receiving ship does not need to execute the next order, it returns to the fuel supply terminal. The second situation: the multi-purpose clean fuel filling and CO2 receiving ship receives the filling order from the offshore methanol-powered ship, executes the "methanol filling mode" operation mode, completes the filling order, and when the volume of CO2 stored on the methanol-powered ship is large, the multi-purpose clean fuel filling and CO2 receiving ship switches to the "CO2 receiving mode" operation mode. When the multi-purpose clean fuel filling and CO2 receiving ship needs to execute the next order, it switches to the corresponding operation mode. When the multi-purpose clean fuel filling and CO2 receiving ship does not need to execute the next order, it returns to the fuel supply terminal. The third situation: the multi-purpose clean fuel filling and CO2 receiving ship receives the CO2 receiving command, executes the "CO2 receiving mode" operation mode, completes the receiving command, and when the multi-purpose clean fuel filling and CO2 receiving ship needs to execute the next command, it switches to the corresponding operation mode. When the multi-purpose clean fuel filling and CO2 receiving ship does not need to execute the next command, it returns to the fuel supply terminal.

4. The method for multi-purpose clean fuel filling and CO2 receiving ship according to claim 3, characterized in that: At the fuel supply terminal, the multi-purpose clean fuel filling and CO2 receiving ship is connected to the shore-based CO2 tank (12) through the receiving connector (4), the recovery valve (9) is opened, and the CO2 in the shore-based CO2 tank (12) is introduced into the C-type tank (2), so that the residual ammonia or methanol evaporated gas in the C-type tank (2) is sent to the GCU unit (3) for combustion.

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