WO2021031196A1

WO2021031196A1 - Lng fuel gas supply system and ship

Info

Publication number: WO2021031196A1
Application number: PCT/CN2019/102030
Authority: WO
Inventors: 金贤; 李慧霖; 黄博; 张春涛; 左文安
Original assignee: 中集船舶海洋工程设计研究院有限公司; 中国国际海运集装箱(集团)股份有限公司
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2021-02-25

Abstract

Provided are a ship and an LNG fuel gas supply system. The ship comprises a ship body, an engine and an LNG fuel gas supply system, wherein the LNG fuel gas supply system comprises a liquid storage tank (11), a pressure pump (12), a gas storage tank (13) and a gasification mechanism (14); a gas pipe (111) and a liquid pipe (112) are arranged on the liquid storage tank (11), and an inlet of the gas storage tank (13) is in communication with the gas pipe (111) of the liquid storage tank (11); a liquid inlet (121), a liquid outlet (122) and a gas exhaust port (123) are provided on the pressure pump (12); and the liquid inlet (121) is in communication with the liquid pipe (112) of the liquid storage tank (11), and the gas exhaust port (123) communicates with both the gas pipe (111) of the liquid storage tank (11) and the inlet of the gas storage tank (13), so as to selectively convey BOG in the pressure pump (12) into the liquid storage tank (11) or the gas storage tank (13). A closed space with a fixed volume is formed by the liquid storage tank (11), the gas storage tank (13) and the pressure pump (12), such that the BOG is self-compressed, and a desired pressure can be obtained without the need for adding a peripheral pressure device.

Description

LNG fuel gas supply system and ships

Technical field

The invention relates to the technical field of ships, in particular to an LNG fuel gas supply system and a ship.

Background technique

Liquefied natural gas (LNG) is a high-quality clean energy. Its main component is methane, which has a high calorific value of combustion and slight environmental pollution. With the increasing demand for improving environmental quality, LNG has received increasing attention. At present, LNG has been widely used as industrial fuel, civil fuel, ship and automobile fuel, and fuel for power generation. Because the LNG storage tank is invaded by the heat of the external environment, or when the LNG is transported by the pressure pump, part of the mechanical energy of the pressure pump is converted into heat energy, which will vaporize the LNG to produce flash vapor, which is the BOG gas. If these BOGs are directly discharged into the atmosphere, precious resources will be wasted and the atmosphere will be polluted at the same time. In the process of BOG gas treatment, the conventional treatment method is to use a compressor to compress the BOG gas to a certain pressure before using it directly; or use a reliquefaction device and other equipment to liquefy the BOG gas and then transport it to the liquid storage tank. . Using these two methods, the operation of peripheral processing equipment such as compressors or reliquefaction devices requires energy consumption, and the installation of BOG peripheral processing equipment such as compressors or reliquefaction devices also requires a large space.

Summary of the invention

The present invention provides a LNG fuel gas supply system, which does not require BOG processing equipment, and BOG gas can reach the pressure required for combustion.

To solve the above technical problems, the present invention adopts the following technical solutions:

An LNG fuel gas supply system includes a liquid storage tank, a pressure pump, a gas storage tank and a gasification mechanism.

LNG fuel is stored in the liquid storage tank; the liquid storage tank is provided with a gas pipe communicating with the gas phase space of the liquid storage tank, and a liquid pipe communicating with the liquid phase space of the liquid storage tank.

The gas storage tank is used to store BOG gas, and the inlet of the gas storage tank is in communication with the gas pipe of the liquid storage tank; the outlet of the gas storage tank discharges a predetermined pressure of gas phase fuel for use.

The pressure pump is used to pressurize the LNG fuel. The pressure pump is provided with a liquid inlet, a liquid outlet and an exhaust port. The liquid inlet is connected with the liquid pipe of the liquid storage tank to receive the The LNG fuel in the liquid storage tank; the exhaust port is arranged at the upper part of the pressure pump, and the exhaust port is in communication with the gas pipe of the liquid storage tank and the inlet of the gas storage tank to selectively The BOG gas in the pressure pump is delivered to the liquid storage tank or the gas storage tank.

The gasification mechanism is used to vaporize the LNG fuel, the inlet end of the vaporization mechanism is connected to the liquid discharge port of the pressure pump, and the outlet end discharges gas-phase fuel outward for use.

Optionally, a first pipeline is provided between the liquid pipe of the liquid storage tank and the liquid inlet of the pressure pump for introducing the LNG fuel in the liquid storage tank into the pressure pump, A first hose is provided between the liquid pipe of the liquid storage tank and the first pipeline, and both ends of the first hose are connected to the liquid pipe of the liquid storage tank and the first pipeline respectively. Connection, a detachable connection between the first hose and the liquid pipe of the liquid storage tank.

Optionally, the gas supply system includes a second pipeline, the second pipeline includes a first branch, a second branch, and a third branch, the first end of the first branch, and the The first end and the first end of the third branch pipe meet each other, the second end of the first branch pipe is connected to the gas pipe of the liquid storage tank, and the second end of the second branch pipe is connected to the gas storage tank. The inlet of the tank, the second end of the third branch pipe is connected to the exhaust port of the pressure pump; the first branch pipe is provided with a first control valve for controlling the flow of BOG gas into and out of the liquid storage tank. A second control valve is provided on the two branch pipes for controlling BOG gas to enter the gas storage tank, and the conveying direction of BOG gas in the pressure pump is controlled by the first control valve and the second control valve.

Optionally, an exhaust pipe is further provided on the second branch pipe, and at least one exhaust valve is provided on the exhaust pipe for controlling the opening and closing of the exhaust pipe.

Optionally, a third pipeline is provided at the outlet of the gas storage tank, and a pressure regulating valve is provided on the third pipeline to control the BOG gas in the gas storage tank to flow out of the gas storage tank. The pressure of the output and output BOG gas.

Optionally, the gas storage tank is provided with a first pressure sensor for detecting the pressure in the gas storage tank, and the first pressure sensor is electrically connected to the pressure regulating valve.

Optionally, the vaporization mechanism includes a vaporizer for vaporizing LNG fuel and a fourth pipeline connected to the vaporizer, and the inlet end of the vaporizer is connected to the discharge of the pressure pump The fourth pipeline is connected to the outlet end of the gasifier for discharging gas-phase fuel outward.

Optionally, the gas supply system further includes a fifth pipeline, and the inlet end of the fifth pipeline is connected with the outlet end of the third pipeline and the outlet end of the fourth pipeline. The outlet end of the five pipelines is connected to the external equipment and is used to deliver the gas-phase fuel to the external equipment.

Optionally, both the third pipeline and the fourth pipeline are provided with check valves.

Optionally, a filter drier is provided on the fifth pipeline.

Optionally, the liquid pipe of the liquid storage tank is provided with a first switch valve, and the liquid storage tank is also provided with a filling pipe for filling LNG fuel, and one end of the filling pipe is connected to the The liquid storage tank is in communication with the internal space of the liquid storage tank, and the other end is connected to the liquid pipe of the liquid storage tank, and the connection between the filling pipe and the liquid pipe is located away from the first switch valve One side of the liquid storage tank.

Optionally, a second switch valve is provided on the filling pipe.

Optionally, one end of the filling pipe connected to the liquid storage tank is arranged on the top of the liquid storage tank.

Optionally, the gas supply system further includes a manifold, the manifold is provided with multiple interfaces, one interface of the manifold is connected to the liquid inlet of the pressure pump, and the remaining multiple interfaces are used for each To connect a liquid pipe of the liquid storage tank.

A ship includes a hull, an engine, and an air supply system. The air supply system and the engine are both fixed on the hull, and the air supply system is connected to the engine to provide energy for the operation of the engine.

It can be known from the above technical solutions that the present invention has at least the following beneficial effects:

In the gas supply system of the present invention, a gas pipe communicating with the gas phase space of the liquid storage tank and a liquid pipe communicating with the liquid phase space of the liquid storage tank are provided on the liquid storage tank, so that the LNG fuel and BOG gas in the liquid storage tank It can be discharged separately, and the separate discharge of LNG fuel and BOG gas does not interfere with each other. The exhaust port of the pressure pump is connected with the gas pipe of the liquid storage tank and the inlet of the gas storage tank, so that the BOG in the pressure pump can be transported to the liquid storage tank. When the LNG in the liquid storage tank decreases during use, the pressure pump The BOG gas enters the liquid storage tank, fills the liquid storage tank, ensures the pressure in the liquid storage tank, and avoids the gasification of LNG fuel caused by the pressure reduction in the liquid storage tank.

At the same time, since the inlet of the gas storage tank is connected with the gas pipe of the liquid storage tank, the BOG gas in the pressure pump and the liquid storage tank can be stored in the gas storage tank. The exhaust port of the pressure pump is connected with the gas pipe of the liquid storage tank and the inlet of the gas storage tank, and the inlet of the gas storage tank is connected with the gas pipe of the liquid storage tank, so that the BOG gas in the liquid storage tank, the gas storage tank and the pressure pump They can circulate with each other. Because the BOG gas will increase over time when the LNG is used, the BOG gas will continue to increase in a fixed volume, and the BOG gas will continue to be compressed, making the pressure between the BOG gases gradually increase. While the gasification mechanism discharges gas-phase fuel outwards, it uses liquid storage tanks, gas storage tanks and pressure pumps to form a closed space with a fixed volume. BOG gas continues to increase in the closed space, making the pressure of BOG itself continue to increase, within a unit volume The concentration of BOG gas continues to increase, and there is no need to add peripheral pressure equipment. The pressure of BOG gas is used for self-compression, and over time, it reaches the pressure required for combustion, so that it can be directly discharged for use.

Description of the drawings

Figure 1 is a schematic view of the connection structure of an embodiment of the gas supply system of the present invention;

Figure 2 is an enlarged view of A in Figure 1;

Figure 3 is an enlarged view of B in Figure 1;

Figure 4 is an enlarged view of C in Figure 1;

Figure 5 is an enlarged view of D in Figure 1;

Fig. 4 is an enlarged view of E in Fig. 1.

The reference signs are explained as follows:

11. Liquid storage tank; 11a, gas phase space; 11b, liquid phase space; 111, gas pipe; 112, liquid pipe; 113, filling pipe; 12. Pressure pump; 121, liquid inlet; 122, liquid outlet; 123 , Exhaust port; 13, gas storage tank; 14, gasification mechanism; 15, vaporizer; 16, filter drier; 17, exhaust pipe; 21, first pipeline; 221, first branch pipe; 222, The second branch; 223, the third branch; 22, the second pipeline; 23, the third pipeline; 24, the fourth pipeline; 25, the fifth pipeline; 26, the sixth pipeline; 27, the manifold; 28. The first hose; 29. The second hose; 31. Pressure regulating valve; 41. The first control valve; 42, the second control valve; 43. The third control valve; 44. The fourth control valve; 51. The first pressure sensor; 52, the second pressure sensor; 53, the third pressure sensor; 54, the fourth pressure sensor; 61, the first on-off valve; 62, the second on-off valve, 71, the relief valve; 72, the check valve.

detailed description

Although the present invention can be easily represented in different forms of embodiments, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification. At the same time, it is understood that this specification should be regarded as the present specification. The exemplary description of the principle of the invention is not intended to limit the invention to that described herein.

Therefore, a feature indicated in this specification will be used to describe one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined to illustrate possible system designs, these features can also be used in other unspecified combinations. Thus, unless otherwise stated, the illustrated combinations are not intended to be limiting.

In the embodiment shown in the drawings, the direction indications (such as up, down, left, right, front and back) are used to explain the structure and movement of the various elements of the present invention are not absolute but relative. When these elements are in the positions shown in the drawings, these descriptions are appropriate. If the description of the position of these elements changes, the directions of these directions are also changed accordingly.

The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings in this specification.

The invention provides an LNG fuel gas supply system, which can be used to provide natural gas fuel to the engine of a ship. Among them, the ship's engine may be a single-fuel engine using only natural gas as fuel, or a dual-fuel engine using natural gas and diesel as fuel.

1 to 6, this embodiment provides an LNG fuel gas supply system, including a liquid storage tank 11, a pressure pump 12, a gas storage tank 13, and a gasification mechanism 14.

1 and 2, LNG fuel is stored in the liquid storage tank 11. The temperature of LNG is very low, and the temperature of the LNG is very different from the external environment. The liquid storage tank 11 is affected by the heat of the external environment, and a small amount of LNG liquid will absorb heat. BOG gas is formed in the liquid storage tank 11. The space above the liquid surface of the LNG liquid in the liquid storage tank 11 is the gas phase space 11a, and the space below the liquid surface of the LNG liquid in the liquid storage tank 11 is the liquid space 11b. The liquid tank 11 is provided with a gas pipe 111 communicating with the gas phase space of the liquid storage tank 11 and a liquid pipe 112 communicating with the liquid phase space of the liquid storage tank 11. The air pipe 111 is arranged at the upper or top of the liquid storage tank 11. The liquid pipe 112 is arranged at the bottom of the liquid storage tank 11 to facilitate the complete discharge of the LNG in the liquid storage tank 11.

The arrangement of the liquid pipe 112 and the gas pipe 111 allows the LNG fuel and BOG gas in the liquid storage tank 11 to be discharged separately, and the separate discharge of LNG fuel and BOG gas does not interfere with each other.

Further, the liquid pipe 112 of the liquid storage tank 11 is provided with a first on-off valve 61. The first on-off valve 61 can control the on-off of the liquid pipe 112, close the first on-off valve 61, and the LNG fuel does not flow on the liquid pipe 112. When the first switch valve 61 is clocked in, the LNG fuel can flow on the liquid pipe 112.

The liquid storage tank 11 is also provided with a filling pipe 113 for filling LNG fuel. One end of the filling pipe 113 is connected to the liquid storage tank 11 and communicates with the internal space of the liquid storage tank 11, and the other end is connected to the liquid storage tank 11. The connection of the liquid pipe 112, the filling pipe 113 and the liquid pipe 112 is located on the side of the first switch valve 61 away from the liquid storage tank 11.

When the liquid pipe 112 of the liquid storage tank 11 is used to fill the liquid storage tank 11 with LNG fuel, the first on-off valve 61 is closed, and the LNG is injected into the liquid storage tank 11 through the filling pipe 113.

It is understandable that a separate filling port can also be opened on the liquid storage tank 11, and when LNG fuel is injected into the liquid storage tank 11 through the filling port alone, the connection of the liquid pipe 112 of the liquid storage tank 11 does not need to be disassembled.

Further, a second switch valve 62 is provided on the filling pipe 113. When the filling pipe 113 is used to fill the liquid storage tank 11 with LNG fuel, first close the first switch valve 61 and open the second switch valve 62. The LNG fuel enters the liquid storage tank 11 from the filling pipe 113 to complete the filling. After the injection, the second on-off valve 62 is closed.

Further, one end of the filling pipe 113 connected to the liquid storage tank 11 is arranged on the top of the liquid storage tank 11. When the liquid storage tank 11 is not used for a long time or is used for the first time, because the temperature inside the liquid storage tank 11 is relatively high, it is necessary to wait for the LNG fuel filled into the gas storage tank 13 to cool down when filling. When the LNG fuel is filled from the top, the LNG fuel will have more contact with the gas in the liquid storage tank 11 during the process of the LNG fuel falling from the top, and a faster cooling rate can be achieved. When in use, first close the first switch valve 61 and open the second switch valve 62. LNG fuel is injected from the top of the liquid storage tank 11. After a certain amount of LNG fuel is injected, it is cooled for a period of time. When the temperature in the liquid storage tank 11 is equalized After that, the second on-off valve 62 is closed, the first on-off valve 61 is opened, and the LNG fuel is continuously injected into the liquid storage tank 11.

1 and 3, the gas storage tank 13 is used to store BOG gas, the inlet of the gas storage tank 13 is in communication with the gas pipe 111 of the liquid storage tank 11; the outlet of the gas storage tank 13 discharges a predetermined pressure of gas phase fuel for supply use.

Further, a third pipeline 23 is provided at the outlet of the gas storage tank 13, and a pressure regulating valve 31 is provided on the third pipeline 23 to control the output of BOG gas in the gas storage tank 13 to the outside of the gas storage tank 13. The pressure of the output BOG gas. As a valve, the pressure regulating valve 31 can not only control the discharge of BOG gas in the gas storage tank 13, but also control the pressure of BOG gas discharged from the pressure regulating valve 31 through adjustment. Preferably, the pressure of the pressure regulating valve 31 is 7 bar. The free end of the third pipeline 23 is used to connect different external mechanisms, and the BOG gas in the gas storage tank 13 can be transported to different locations.

The gas tank 13 is provided with a first pressure sensor 51. The first pressure sensor 51 is used to detect the pressure in the gas storage tank 13 to monitor the pressure in the gas storage tank 13 in real time. In this embodiment, an interface is provided outside the tank body of the gas storage tank 13 for installing the first pressure sensor 51. The first pressure sensor 51 is arranged outside the gas storage tank 13 for easy observation.

Further, the first pressure sensor 51 is electrically connected to the pressure regulating valve 31 or the pressure regulating valve 31 is a self-operated pressure regulating valve. When the pressure detected by the first pressure sensor 51 reaches the preset pressure, the pressure regulating valve 31 is opened to discharge BOG gas to ensure the safety of the gas storage tank. After the pressure drops, the pressure regulating valve closes 31.

In a specific embodiment, in order to realize automatic discharge of the gas in the gas storage tank 13, when the pressure in the gas storage tank 13 reaches a preset level, the pressure regulating valve 31 can be automatically opened.

The gas supply system also includes a control center for controlling the automatic operation of the gas supply system. The control center is electrically connected to the first pressure sensor 51 and the pressure regulating valve 31, so that when the pressure in the gas storage tank 13 reaches a preset value, the control center The pressure valve 31 opens automatically. Specifically, when the first pressure sensor 51 detects that the pressure in the gas storage tank reaches a preset value, it transmits a signal to the control center, and the control center controls the pressure regulating valve 31 to open to realize automatic discharge of BOG gas.

1 and 4, the pressure pump 12 is used to pressurize the LNG fuel. The pressure pump 12 can be a low pressure pump or a high pressure pump. In this embodiment, the pressure pump is a low pressure pump. The pressure of the LNG liquid flowing through the pressure pump 12 Less than 16bar, it is a low-pressure gas supply pipeline, used in an environment that only needs a lower pressure requirement.

In the process of working, part of the mechanical energy of the pressure pump 12 is converted into heat energy. The LNG liquid in the pressure pump 12 absorbs the heat energy of the pressure pump 12 to form BOG gas in the pressure pump 12, and at the same time, the LNG liquid is transported from the liquid storage tank 11. When it reaches the pressure pump 12, the LNG will also form BOG gas during the transportation process, and the BOG gas formed during the transportation process will also be transported to the pressure pump 12.

The pressure pump 12 is provided with a liquid inlet 121, a liquid outlet 122 and an exhaust port 123; the liquid inlet 121 communicates with the liquid pipe 112 of the liquid storage tank 11 to receive the LNG fuel in the liquid storage tank 11; The port 123 is provided on the upper part of the pressure pump 12, and the exhaust port 123 is in communication with the gas pipe 111 of the liquid storage tank 11 and the inlet of the gas storage tank 13, so as to selectively deliver the BOG gas in the pressure pump 12 to the liquid storage tank 11. Or in the gas storage tank 13.

The liquid inlet 121, the liquid outlet 122, and the air outlet 123 of the pressure pump 12 in this embodiment are all located on the closed pump pool formed by the pressure pump 12, and the pump pool is a sealed space. Since the BOG gas is located above the LNG liquid, the height of the exhaust port 123 is higher than the height of the liquid discharge port 122 and the liquid inlet 121. The pressure pump 12 can provide pressure to the LNG to facilitate the transportation of the LNG in the entire gas supply system. The sealing arrangement of the pressure pump 12 prevents the BOG gas in the pressure pump 12 from leaking. A third pressure sensor 53 is provided at the discharge port 122 of the pressure pump 12.

The exhaust port 123 of the pressure pump 12 is in communication with the gas pipe 111 of the liquid storage tank 11 and the inlet of the gas storage tank 13, so that the BOG in the pressure pump 12 can be delivered to the liquid storage tank 11. The LNG in the liquid storage tank 11 is reduced during use, and the space in the liquid storage tank 11 is released, so that the pressure in the liquid storage tank 11 decreases, and the BOG gas in the pressure pump 12 enters the liquid storage tank 11 to fill the storage tank 11 The liquid tank 11 ensures the pressure in the liquid storage tank 11 and avoids the vaporization of LNG fuel due to the decrease in the pressure in the liquid storage tank 11.

Since the inlet of the gas storage tank 13 is connected with the gas pipe 111 of the liquid storage tank 11, the BOG gas in the pressure pump 12 and the liquid storage tank 11 can be stored in the gas storage tank 13. When the pressure in the liquid storage tank 11 or the gas storage tank 13 is too high, the outlet of the gas storage tank 13 is opened, and the BOG gas is discharged to the outside for combustion work. The exhaust port 123 of the pressure pump 12 communicates with the gas pipe 111 of the liquid storage tank 11 and the inlet of the gas storage tank 13, and the inlet of the gas storage tank 13 communicates with the gas pipe 111 of the liquid storage tank 11, so that the liquid storage tank 11, The BOG gas in the gas tank 13 and the pressure pump 12 can circulate with each other. Because the BOG gas will increase over time when the LNG is used, the BOG gas will continue to increase in a fixed volume, and the BOG gas will continue to be compressed. The pressure between BOG gases gradually increases. The liquid storage tank 11, the gas storage tank 13 and the pressure pump 12 are used to form a closed space with a fixed volume. The BOG gas is continuously increasing in the closed space, so that the pressure of BOG itself is continuously increased, and the concentration of BOG gas per unit volume is continuously increasing. , No need to add peripheral pressure equipment, use the pressure of BOG gas for self-compression, and accumulate over time to reach the pressure required for combustion. After reaching a higher pressure, it can be discharged directly to be used as fuel.

Utilizing the connection relationship between the liquid storage tank 11, the gas storage tank 13, and the pressure pump 12, there is no need to install too many peripheral equipment on the ship, which not only can effectively avoid the complicated installation of the pipeline of the gas supply system, but also reduce Small installation space for gas supply system.

1 and 5, a first pipeline 21 is provided between the liquid pipe 112 of the liquid storage tank 11 and the liquid inlet 121 of the pressure pump 12 for introducing the LNG fuel in the liquid storage tank 11 to the pressure pump 12 Inside, a first hose 28 is provided between the liquid pipe 112 of the liquid storage tank 11 and the first pipeline 21, and two ends of the first hose 28 are connected to the liquid pipe 112 and the first pipeline 21 of the liquid storage tank 11 respectively. Connected, the first hose 28 and the liquid pipe 112 of the liquid storage tank 11 are detachably connected. When it is necessary to add LNG fuel to the liquid storage tank 11, the first hose 28 is separated from the liquid pipe 112 of the liquid storage tank 11, and the liquid pipe 112 of the liquid storage tank 11 is used to inject LNG fuel into the liquid storage tank 11. In order to facilitate the connection and disassembly between the first hose 28 and the liquid pipe 112 of the liquid storage tank 11, the first hose 28 and the liquid pipe 112 of the liquid storage tank 11 are aligned with joints for convenient connection.

It is understandable that the first hose 28 can also play a role of damping. The arrangement of the first hose 28 can ensure that the vibration between the liquid storage tank 11 and the first pipeline 21 does not interfere with each other, especially for liquid storage. The vibration between the tank 11 and the pressure pump 12 will not interfere, ensuring that the connection at each joint is not easily loosened.

1 and 4, a sixth pipeline 26 is provided between the pressure pump 12 and the first pipeline 21 in this embodiment, one end of the sixth pipeline 26 is connected to the first pipeline 21, and the other end is connected to the pressure pump 12 of the liquid inlet 121. The sixth pipeline 26 is provided with a relief valve 71 for releasing LNG liquid. In this embodiment, the relief valve 71 is a ball valve.

The gas supply system further includes a second pipeline 22, the second pipeline 22 includes a first branch 221, a second branch 222, and a third branch 223, the first end of the first branch 221, the first end of the second branch 222, and The first ends of the third branch pipes 223 meet each other, the second end of the first branch pipe 221 is connected to the gas pipe 111 of the liquid storage tank 11, the second end of the second branch pipe 222 is connected to the inlet of the gas storage tank 13, and the third branch pipe 223 The second end is connected to the exhaust port 123 of the pressure pump 12; the first branch pipe 221 is provided with a first control valve 41 for controlling BOG gas to enter and exit the liquid storage tank 11, and the second branch pipe is provided with a second control valve 42 , Used to control the BOG gas to enter the gas storage tank 13, through the opening and closing of the first control valve 41 and the second control valve 42, to control the delivery direction of the BOG gas in the pressure pump 12.

The first control valve 41 is opened and the second control valve 42 is closed. The BOG gas in the pressure pump 12 flows into the liquid storage tank 11 through the third branch pipe 223 and the first branch pipe 221 separately. The first control valve 41 is closed and the second control valve 42 is opened. The BOG gas in the pressure pump 12 flows to the gas storage tank 13 through the third branch pipe 223 and the second branch pipe separately. The first control valve 41 and the second control valve 42 are opened at the same time, and the BOG gas in the pressure pump 12 flows to the liquid storage tank 11 and the gas storage tank 13 at the same time.

When the BOG gas in the pressure pump 12 flows to the liquid storage tank 11 alone, it is used to maintain the pressure in the liquid storage tank 11. When the BOG gas pressure in the liquid storage tank 11 reaches the set level, the second control valve 42 is opened, so that the BOG liquid in the liquid storage tank 11 and the pressure pump 12 flows to the gas storage tank 13. When the pressure of the BOG gas in the gas storage tank 13 also reaches the set value, the pressure regulating valve 31 is opened to release the BOG gas outward.

In this embodiment, a third control valve 43 and a second pressure sensor 52 are provided on the first pipeline 21.

Further, an exhaust pipe 17 is also provided on the second branch pipe, and at least one exhaust valve is provided on the exhaust pipe 17 for controlling the opening and closing of the exhaust pipe 17. In this embodiment, the discharge pipe 17 is connected to two safety valves through a plug valve. The exhaust pipe 17 can be used to discharge the gas in the liquid storage tank 11, the pressure pump 12 and the gas storage tank 13.

It can be understood that the exhaust pipe 17 can also be arranged at the outlet end of the gas storage tank 13, and BOG gas is input at the inlet of the gas storage tank 13, and exhaust is discharged from the outlet of the gas storage tank 13, so as to facilitate the Other gases are discharged.

In this embodiment, a second hose 29 is provided between the air pipe 111 of the liquid storage tank 11 and the second pipeline 22. The function of the second hose 29 is the same as that of the first hose 28, which can also avoid joints. Loose.

In the actual working process, the liquid storage tank 11, the gas pipe 111, the liquid pipe 112, and the filling pipe 113 can be set as a whole, and joints are set on the free ends of the gas pipe 111 and the liquid pipe 112 to pass through the gas pipe 111 and the liquid pipe 112. The joint tank is connected to the outside.

1, the vaporization mechanism 14 is used to vaporize LNG fuel. The inlet end of the vaporization mechanism 14 is connected to the liquid discharge port 122 of the pressure pump 12, and the outlet end discharges gas-phase fuel outward for use.

The vaporization mechanism 14 of this embodiment includes a vaporizer 15 for vaporizing LNG fuel and a fourth pipeline 24 connected to the vaporizer 15. The inlet end of the vaporizer 15 is connected to the discharge of the pressure pump 12 Port 122 and the fourth pipeline 24 are connected to the outlet end of the gasifier 15 for discharging gas-phase fuel outward. The LNG fuel is both liquid in the liquid storage tank 11 and the pressure pump 12, and is converted into a gas state by the vaporizer 15. LNG needs to absorb heat in the process of converting from liquid to gas. Preferably, the pipe of the cooling system of the engine is connected to the vaporizer 15. During the process of LNG vaporization and heat absorption, the vaporizer 15 can also perform heat dissipation and cooling of the cooling system.

1 and 6, the gas supply system in this embodiment further includes a fifth pipe 25, the inlet end of the fifth pipe 25 is connected to the outlet end of the third pipe 23 and the outlet end of the fourth pipe 24 Both are connected, and the outlet end of the fifth pipeline 25 is connected to an external device for delivering gas-phase fuel to the external device.

In this embodiment, the external device connected to the fifth pipeline 25 is a dual-fuel diesel engine, and both gas-phase fuel and BOG gas can drive the dual-fuel diesel engine to perform work.

It is understandable that BOG gas and gas-phase fuel can act independently. A main engine is installed on the hull of the ship. The main engine is connected to the gasification mechanism 14 and uses LNG as fuel. At the same time, an auxiliary mechanism is installed on the hull of the ship to use BOG. Gas is used as fuel.

Further, both the third pipeline 23 and the fourth pipeline 24 are provided with a check valve 72. The check valve 72 can not only prevent the gas in the third pipeline 23 and the fourth pipeline 24 from flowing back, but also prevent BOG gas from flowing back into the gasification mechanism 14 or gas-phase fuel flowing back into the third pipeline 23.

Further, a filter drier 16 is provided on the fifth pipeline 25. In this embodiment, the gas-phase fuel and BOG gas can be mixed to perform work on the dual-fuel diesel engine. When the BOG gas does not perform work, the gas-phase fuel is used to perform work on the dual-fuel diesel engine alone. In order to dry the gas-phase fuel and BOG gas and ensure that the gas-phase fuel or BOG gas has a better combustion effect, a drying filter 16 is provided on the fifth pipeline 25 of this embodiment.

In this application, the gas-phase fuel and BOG gas are mixed first, and then dried and filtered to make the discharged fuel more dry and cleaner.

In this embodiment, a fourth control valve 44 and a fourth pressure sensor 54 are provided on the fifth pipeline 25.

Specifically, the first pressure sensor 51, the second pressure sensor 52, the third pressure sensor 53, and the fourth pressure sensor 54 are all electrically connected to the control center, so as to detect the pressure of each part of the gas supply system in real time. The first control valve 41, the second control valve 42, the third control valve 43, and the fourth control valve 44 are all electrically connected to the control center. Through the control center, the opening and closing of the first control valve 41, the second control valve 42, the third control valve 43 and the fourth control valve 44 are controlled to realize the control of the pipeline of the air supply system.

The gas supply system of this embodiment also includes a manifold 27. The manifold 27 is provided with multiple interfaces. One interface of the manifold 27 is connected to the liquid inlet 121 of the pressure pump 12, and the remaining multiple interfaces are each used to connect one The liquid pipe 112 of the liquid storage tank 11. In this embodiment, the manifold 27 is connected to the pressure pump 12 through the sixth pipeline 26, and multiple interfaces of the manifold 27 are respectively connected to multiple liquid storage tanks 11 through pipes, so that multiple storage tanks can be installed in one gas supply system. The liquid tank 11 controls the energy supply of multiple liquid storage tanks 11 to realize the continuous supply of LNG fuel.

In this embodiment, the first pipeline 21, the third pipeline 23, the fifth pipeline 25 and the fourth pipeline 24 are all provided with check valves. It is understandable that a check valve may also be provided on one end of the second pipeline 22 connected to the pressure pump 12 and the sixth pipeline 26. In this embodiment, a valve is provided at one end of the second pipeline 22 connected to the pressure pump 12.

Further, a manual valve can be provided on each pipeline to manually control the flow of LNG fuel and BOG gas in the system.

The general working principle of the gas supply system of this embodiment is as follows:

The LNG liquid in the liquid storage tank 11 is transported to the pressure pump 12 through the first pipeline 21. The LNG liquid is pressurized by the pressure pump 12, and the LNG liquid pressurized by the pressure pump 12 is vaporized in the vaporizer 15. It becomes a gas-phase fuel, and the gas-phase fuel passes through the fourth pipe 24 and is discharged into the engine after being dried by the filter drier 16 on the fifth pipe 25.

When the pressure in the liquid storage tank 11 reaches a certain level, the first control valve 41 and the second control valve 42 are opened, and the first branch pipe 221 and the second branch pipe 22 are used to transport the BOG in the liquid storage tank 11 to the gas storage tank 13 ; At the same time, the BOG gas in the pressure pump 12 is transported to the gas storage tank 13 through the third branch pipe 223 and the second branch pipe 222. As time goes by, the BOG gas continues to increase, and the liquid storage tank 11 and the gas storage tank 13 When the pressure in the liquid storage tank 11 and the gas storage tank 13 reaches the preset value, open the pressure regulating valve 31, the BOG gas in the gas storage tank 13 and the gaseous fuel vaporized in the vaporizer 15 It is mixed in the fifth pipeline 25, and then dried by the filter drier 16, and discharged to the engine for use.

When the pressure in the liquid storage tank 11 is low, the first control valve 41 is opened and the second control valve 42 is closed. The BOG gas in the pressure pump 12 flows into the liquid storage tank 11 through the third branch pipe 223 and the first branch pipe 221. To maintain the pressure in the liquid storage tank 11.

Although the present invention has been described with reference to a few typical embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present invention can be implemented in various forms without departing from the spirit or essence of the invention, it should be understood that the above-mentioned embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents shall be covered by the appended claims.

Claims

An LNG fuel gas supply system, characterized in that it includes:

A liquid storage tank, in which LNG fuel is stored; the liquid storage tank is provided with a gas pipe communicating with the gas phase space of the liquid storage tank, and a liquid pipe communicating with the liquid phase space of the liquid storage tank;

A gas storage tank for storing BOG gas, the inlet of the gas storage tank is in communication with the gas pipe of the liquid storage tank; the outlet of the gas storage tank discharges gas-phase fuel at a preset pressure outward for use;

The pressure pump is used to pressurize the LNG fuel. The pressure pump is provided with a liquid inlet, a liquid outlet, and an exhaust port. The liquid inlet is connected with the liquid pipe of the liquid storage tank to receive The LNG fuel in the liquid storage tank; the exhaust port is arranged at the upper part of the pressure pump, and the exhaust port is in communication with the gas pipe of the liquid storage tank and the inlet of the gas storage tank to select Sexually transport the BOG gas in the pressure pump to the liquid storage tank or the gas storage tank; and

The gasification mechanism is used to vaporize the LNG fuel. The inlet end of the vaporization mechanism is connected to the liquid discharge port of the pressure pump, and the outlet end discharges gas-phase fuel outward for use.
The gas supply system of claim 1, wherein a first pipeline is provided between the liquid pipe of the liquid storage tank and the liquid inlet of the pressure pump for connecting the liquid storage tank The LNG fuel is introduced into the pressure pump, a first hose is arranged between the liquid pipe of the liquid storage tank and the first pipeline, and both ends of the first hose are connected to the liquid storage tank respectively. The liquid pipe of the tank is connected with the first pipeline, and the first hose and the liquid pipe of the liquid storage tank are detachably connected.
The gas supply system according to claim 1, wherein the gas supply system includes a second pipeline, and the second pipeline includes a first branch pipe, a second branch pipe, and a third branch pipe, and the first branch pipe The first end of the second branch pipe and the first end of the third branch pipe meet each other, the second end of the first branch pipe is connected to the gas pipe of the liquid storage tank, and the second The second end of the branch pipe is connected to the inlet of the gas storage tank, and the second end of the third branch pipe is connected to the exhaust port of the pressure pump;

The first branch pipe is provided with a first control valve for controlling BOG gas to enter and exit the liquid storage tank, and the second branch pipe is provided with a second control valve for controlling BOG gas to enter the gas storage tank and pass through The first control valve and the second control valve control the delivery direction of BOG gas in the pressure pump.
The air supply system of claim 3, wherein an exhaust pipe is further provided on the second branch pipe, and at least one exhaust valve is provided on the exhaust pipe for controlling the exhaust pipe Opening and closing.
The gas supply system of claim 1, wherein a third pipeline is provided at the outlet of the gas storage tank, and a pressure regulating valve is provided on the third pipeline to control The output of the BOG gas to the outside of the gas storage tank and the pressure of the output BOG gas.
The gas supply system of claim 5, wherein the gas storage tank is provided with a first pressure sensor for detecting the pressure in the gas storage tank, and the first pressure sensor is electrically connected to the pressure regulating valve .
The gas supply system according to claim 5, wherein the gasification mechanism includes a gasifier for gasifying LNG fuel and a fourth pipeline connected to the gasifier, and the gasifier The inlet end is connected to the discharge port of the pressure pump, and the fourth pipeline is connected to the outlet end of the vaporizer for discharging gas-phase fuel outward.
The gas supply system according to claim 7, wherein the gas supply system further comprises a fifth pipe, the inlet end of the fifth pipe and the outlet end of the third pipe and the fourth pipe The outlet ends of the pipeline are all connected, and the outlet end of the fifth pipeline is connected to an external device and is used to deliver gas-phase fuel to the external device.
The gas supply system according to claim 8, wherein the third pipeline and the fourth pipeline are both provided with check valves.
8. The air supply system according to claim 8, wherein a filter drier is provided on the fifth pipeline.
The gas supply system according to claim 1, wherein the liquid pipe of the liquid storage tank is provided with a first switch valve, and the liquid storage tank is also provided with a filling pipe for filling LNG fuel, One end of the filling pipe is connected to the liquid storage tank and communicated with the internal space of the liquid storage tank, and the other end is connected to the liquid pipe of the liquid storage tank, the filling pipe and the liquid pipe The connection is located on the side of the first switching valve away from the liquid storage tank.
The gas supply system according to claim 11, wherein a second switch valve is provided on the filling pipe.
The gas supply system according to claim 12, wherein one end of the filling pipe connected to the liquid storage tank is arranged on the top of the liquid storage tank.
The gas supply system according to claim 1, wherein the gas supply system further comprises a manifold, the manifold is provided with a plurality of ports, and one port of the manifold is connected to the pressure pump The liquid inlet of the, and the remaining multiple interfaces are each used to connect a liquid pipe of the liquid storage tank.
A ship, characterized in that it comprises a hull, an engine, and the air supply system according to any one of claims 1-14, the air supply system and the engine are both fixed on the hull, and the air supply system is connected For the engine, it is used to provide energy for the work of the engine.