Gas supply system for LNG (Liquefied Natural Gas) ship

Abstract

The utility model discloses a gas supply system for an LNG (Liquefied Natural Gas) ship. The gas supply system comprises an LNG injection header pipe, the LNG injection header pipe is connected with an LNG storage tank, the LNG storage tank is connected with a fuel pump, a filter is arranged between the fuel pump and the LNG storage tank, the rear end of the fuel pump is connected with an LNG evaporator, and one end of the LNG evaporator is connected with a cold energy recovery system; the cold energy recovery system comprises a heat exchanger, the heat exchanger conveys part of cold energy released from the LNG evaporator into an air conditioning system and a refrigerated warehouse, and the other part of the cold energy is conveyed into a cold energy storage system; the heat exchanger is arranged behind the LNG evaporator, cold energy released in the LNG gasification process is captured and utilized and transmitted to places such as an air conditioning system and a refrigerated warehouse which are arranged at the rear end, and meanwhile part of the cold energy is transmitted to the storage system for standby application; the two groups of fuel pumps and filters can operate simultaneously or singly, and the other group of fuel pumps and filters can be used for standby application during single operation, so that the simultaneous damage is avoided.

Description

Technical Field

[0001] The utility model relates to a gas supply system for LNG ships. Background Art

[0002] LNG ship, also known as liquefied natural gas ship, is a ship specially used to transport liquefied natural gas (LNG). LNG is made by cooling natural gas to a low temperature of about -162°C, turning it from gas to liquid, reducing its volume by about 600 times, thus facilitating large-scale, long-distance marine transportation.

[0003] The gas supply system of LNG ships is a key part of ship operations. It is responsible for converting liquefied natural gas (LNG) from a storage state to a gaseous state in order to meet the ship's own power needs or supply gas to onshore facilities. Traditional LNG ships mainly rely on evaporators to convert stored liquid natural gas (LNG) into gaseous natural gas (GNG) for ship use. The conversion of natural gas from liquid to gas will absorb heat, causing the external temperature to drop, affecting the use of other equipment. The inability to recycle this part of energy will continue to affect the operation of the gas supply system in the cabin and the accuracy of the monitoring system. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a gas supply system for LNG ships to improve the energy recovery rate.

[0005] Based on the technical problems existing in the background technology, the utility model proposes a gas supply system for LNG ships, including an LNG injection main pipe, the LNG injection main pipe is connected to an LNG storage tank, the LNG storage tank is connected to a fuel pump, a filter is arranged between the fuel pump and the LNG storage tank, the rear end of the fuel pump is connected to an LNG evaporator, one end of the LNG evaporator is connected to a cold energy recovery system, and the other end is connected to an LNG heater, the LNG heater is connected to an LNG buffer tank, one end of the LNG buffer tank is connected to an LNG gas main valve, one end of the LNG gas main valve is connected to a valve group control unit, and the rear end of the valve group control unit is connected to a gas main and auxiliary engine, that is, gas is supplied to the gas main and auxiliary engine;

[0006] The cold energy recovery system includes a heat exchanger connected to the LNG evaporator, and the heat exchanger transmits part of the cold energy released in the LNG evaporator to the air-conditioning system and the refrigerated warehouse, and transmits the other part to the cold energy storage system.

[0007] Preferably, the LNG evaporator is also provided with an LNG vapor reflux pipe connected to the LNG storage tank.

[0008] Preferably, an LNG liquid return pipe connected to the LNG injection main pipe is provided at the outlet of the fuel pump, and the LNG liquid return pipe injects LNG into the LNG storage tank and performs cold storage operation on the LNG storage tank.

[0009] Preferably, the fuel pump and the filter are provided in two groups, which are commonly connected to the LNG outlet position in the LNG storage tank.

[0010] Preferably, an LNG outlet main valve is provided between the LNG storage tank and the filter, and a plurality of pressure sensors and temperature sensors are provided in the rear end pipeline of the LNG storage tank.

[0011] Preferably, a control valve is provided between the cold energy displaced in the heat exchanger and the air-conditioning system, the refrigerated warehouse and the cold energy storage system, and a plurality of the control valves are provided in the air supply pipeline.

[0012] Compared with the prior art, the gas supply system for LNG ships proposed in the utility model adopts the above technical solution and achieves the following technical effects:

[0013] 1. The utility model captures and utilizes the cold energy released during the LNG gasification process by arranging a heat exchanger after the LNG evaporator, and transmits it to the air-conditioning system, refrigerated warehouse and other places arranged at the back end. At the same time, part of the cold energy is transmitted to the storage system for standby, so as to reasonably utilize energy and avoid the cold energy from spreading to the gas supply system and causing equipment paralysis.

[0014] 2. The two sets of fuel pumps and filters provided in the utility model can be operated simultaneously or individually. When one set is operated individually, the other set can be kept as a standby to avoid damage at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] In the figure: 1. LNG injection main pipe; 2. LNG storage tank; 3. Filter; 4. Fuel pump; 5. LNG evaporator; 6. Heat exchanger; 7. Cold energy storage system; 8. Air conditioning system; 9. Refrigerated warehouse; 10. LNG heater; 11. LNG buffer tank; 12. LNG gas main valve; 13. Valve group control unit; 14. Main and auxiliary gas machines; 15. LNG steam reflux pipe; 16. LNG liquid reflux pipe; 17. LNG outlet main valve; 18. Pressure sensor; 19. Temperature sensor; 20. Control valve. DETAILED DESCRIPTION

[0017] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0019] Reference Figure 1 The utility model proposes a gas supply system for LNG ships, including an LNG injection main pipe 1, the LNG injection main pipe 1 is connected to an LNG storage tank 2, the LNG storage tank 2 is connected to a fuel pump 4, a filter 3 is provided between the fuel pump 4 and the LNG storage tank 2, the rear end of the fuel pump 4 is connected to an LNG evaporator 5, one end of the LNG evaporator 5 is connected to a cold energy recovery system, and the other end is connected to an LNG heater 10, the LNG heater 10 is connected to an LNG buffer tank 11, one end of the LNG buffer tank 11 is connected to an LNG gas main valve 12, one end of the LNG gas main valve 12 is connected to a valve group control unit 13, and the rear end of the valve group control unit 13 is connected to a gas main and auxiliary machine 14, that is, gas is supplied to the gas main and auxiliary machine 14;

[0020] Specifically, the cold energy recovery system includes a heat exchanger 6 connected to the LNG evaporator 5. The heat exchanger 6 transmits part of the cold energy released in the LNG evaporator 5 to the air-conditioning system 8 and the refrigerated warehouse 9, and transmits the other part to the cold energy storage system 7.

[0021] In this embodiment, LNG is delivered from injection manifold 1 to LNG storage tank 2. During this process, filter 3 is used to remove impurities to ensure the purity of fuel, and fuel pump 4 pumps LNG from the storage tank to LNG evaporator 5, where LNG is heated and converted into gaseous form.

[0022] Part of the cold energy released by LNG during evaporation is transported to the air conditioning system 8 and the refrigerated warehouse 9 through the heat exchanger 6 for use, so as to improve the comprehensive utilization efficiency of energy. The other part of the cold energy is transported to the cold energy storage system 7 for subsequent use when needed.

[0023] The gasified LNG is further heated and temperature-controlled by the heater 10, and then stored in the buffer tank 11. The LNG from the buffer tank 11 is accurately delivered to the main and auxiliary gas engines 14 through the main gas valve 12 and the valve group control unit 13 for combustion.

[0024] Specifically, the LNG evaporator 5 is also provided with an LNG vapor reflux pipe 15 connected to the LNG storage tank 2 .

[0025] Specifically, an LNG liquid return pipe 16 connected to the LNG injection main pipe 1 is provided at the outlet of the fuel pump 4 . The LNG liquid return pipe 16 injects LNG into the LNG storage tank 2 and performs a cold storage operation on the LNG storage tank 2 .

[0026] Specifically, two groups of fuel pumps 4 and filters 3 are provided and are commonly connected to the LNG outlet position in the LNG storage tank 2 .

[0027] In this embodiment, the LNG vapor return pipe 15 and the LNG liquid return pipe 16 are set up at key nodes to ensure the smooth operation of the system and the effective circulation of LNG. At the same time, the installed pressure sensor 18 and temperature sensor 19 are used to monitor the system status to ensure safe and efficient operation. The fuel pump and filter adopt a double group design to improve the reliability of the system.

[0028] Specifically, an LNG outlet main valve 17 is provided between the LNG storage tank 2 and the filter 3 , and a plurality of pressure sensors 18 and temperature sensors 19 are provided in the rear end pipeline of the LNG storage tank 2 .

[0029] Specifically, a control valve 20 is provided between the cold energy displaced in the heat exchanger 6 and the air-conditioning system 8, the refrigerated warehouse 9 and the cold energy storage system 7, and a plurality of control valves 20 are provided in the air supply pipeline. The setting of the control valve 20 ensures the precise distribution and use of cold energy.

[0030] In this embodiment, the energy consumption of the entire system is greatly reduced through the effective recovery and utilization of cold energy, and efficient utilization of energy is achieved. At the same time, cold energy is used to provide a cold source for the ship's air conditioning system and refrigerated warehouse, which can significantly reduce fuel consumption and operating costs. The multiple monitoring and control measures in the system ensure the safety and reliability of the LNG gas supply process. By optimizing fuel utilization and reducing energy waste, the system helps reduce greenhouse gas emissions and has a positive impact on the environment.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gas supply system for LNG ships, characterized in that: The invention comprises an LNG injection main pipe (1), wherein the LNG injection main pipe (1) is connected to an LNG storage tank (2), the LNG storage tank (2) is connected to a fuel pump (4), a filter (3) is provided between the fuel pump (4) and the LNG storage tank (2), the rear end of the fuel pump (4) is connected to an LNG evaporator (5), one end of the LNG evaporator (5) is connected to a cold energy recovery system, and the other end is connected to an LNG heater (10), the LNG heater (10) is connected to an LNG buffer tank (11), one end of the LNG buffer tank (11) is connected to an LNG gas main valve (12), one end of the LNG gas main valve (12) is connected to a valve group control unit (13), and the rear end of the valve group control unit (13) is connected to a gas main auxiliary machine (14), that is, gas is supplied to the gas main auxiliary machine (14); The cold energy recovery system comprises a heat exchanger (6) connected to the LNG evaporator (5), wherein the heat exchanger (6) transmits part of the cold energy released in the LNG evaporator (5) to an air conditioning system (8) and a refrigerated warehouse (9), and transmits the other part to a cold energy storage system (7).

2. A gas supply system for LNG ships according to claim 1, characterized in that: The LNG evaporator (5) is also provided with an LNG vapor reflux pipe (15) connected to the LNG storage tank (2).

3. The gas supply system for LNG ships according to claim 1, characterized in that: An LNG liquid return pipe (16) connected to the LNG injection main pipe (1) is provided at the outlet of the fuel pump (4); the LNG liquid return pipe (16) injects LNG into the LNG storage tank (2) and performs a cold storage operation on the LNG storage tank (2).

4. The gas supply system for LNG ships according to claim 1, characterized in that: The fuel pump (4) and the filter (3) are provided in two groups and are connected together to the LNG outlet position in the LNG storage tank (2).

5. The gas supply system for LNG ships according to claim 1, characterized in that: An LNG outlet main valve (17) is provided between the LNG storage tank (2) and the filter (3), and a plurality of pressure sensors (18) and temperature sensors (19) are provided in the rear end pipeline of the LNG storage tank (2).

6. The gas supply system for LNG ships according to claim 1, characterized in that: A control valve (20) is provided between the cold energy replaced in the heat exchanger (6) and the air conditioning system (8), the refrigerated warehouse (9) and the cold energy storage system (7), and a plurality of the control valves (20) are provided in the air supply pipeline.

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