KR101505796B1 - Venting apparatus for engine and fuel gas supply system in ships - Google Patents

Abstract

A gas discharging apparatus for an engine and a fuel gas supply system in a ship is disclosed. According to an embodiment of the present invention, the gas discharging apparatus for the engine and the fuel gas supply system in the ship includes: a first gas discharging line having one end connected to the fuel gas supply system which processes an LNG stored in a storage tank to match the conditions for requirement of the engine and supplies the LNG; and a second gas discharging line having one end connected to the engine, and connects the other end of the first gas discharging line and the other end of the second gas discharging line, individually or by joining them, into the water on the outside of a hull, thus being arranged to discharge a fuel gas remained in the fuel gas supply system or the engine into the water.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas exhaust system for a ship engine and a fuel gas supply system,

More particularly, the present invention relates to an engine of a ship capable of safely discharging a gas remaining in an engine or a fuel gas supply system of a marine vessel in an emergency situation, To a gas exhaust system of a supply system.

As IMO regulations on the emission of greenhouse gases and various air pollutants are strengthened, shipbuilding and marine industries are replacing the use of conventional oil and diesel oil with natural gas, which is a clean energy source, There are a lot of cases in which they are used.

A ship using natural gas (hereinafter referred to as "NG") as a fuel includes a storage tank for storing LNG (Liquefied Natural Gas) in which NG is liquefied, and a boil off gas (BOG) or LNG stored in a storage tank And a fuel gas supply system for supplying the fuel to the engine (converting pressure, temperature, state, etc.) so as to be usable as fuel. Here, the storage tank may be an LNG fuel tank or an LNG cargo tank.

The fuel gas supply system is a system in which the evaporation gas of the storage tank is compressed to meet the supply conditions through a multi-stage compressor and then supplied to the engine. The LNG is directly taken out from the storage tank, compressed to a high pressure using a high- A method in which the vaporized gas in the storage tank is compressed in a compressor, and then re-liquefied in a cryogenic heat exchanger and supplied to a high-pressure pump. In addition, the evaporation gas in the storage tank is compressed by a compressor, and is liquefied by LNG through a re-liquefaction device and then sent to a storage tank.

However, as described above, since the evaporation gas is used as the fuel gas or the liquid is re-liquefied and stored in the storage tank again, a complex apparatus and a process are required, which is expensive. In order to reduce the cost, a vent mast is installed in the storage tank to discharge the evaporated gas into the atmosphere as it is.

Meanwhile, a high-pressure gas injection engine such as the ME-GI engine developed by MAN Diesel & Turbo recently has been spotlighted as being excellent in efficiency. Such a high-pressure gas injection engine is characterized in that gas fuel is supplied at a high pressure close to 300 bar . Therefore, in the related industry, researches on a system for supplying fuel gas to such a high-pressure gas injection engine are actively conducted.

When shutting down the high-pressure gas injection engine or shutting off the supply of the fuel gas in an emergency, high-pressure fuel gas remains in the high-pressure gas injection engine or the fuel gas supply system, The high-pressure gas injection engine or the fuel gas supply system may be affected, which may lead to damage or shortening of durability.

Therefore, in order to discharge the remaining high-pressure fuel gas, a method of connecting a pipe to a conventional vent mast and discharging it is used. However, since the vent mast is used to discharge low-pressure evaporation gas, there is a fear that the vent mast may be damaged Therefore, there is a risk of fire or explosion as high-pressure fuel gas is discharged, and thus there is a need for a method for safely treating residual high-pressure fuel gas.

Korean Registered Utility Model No. 20-0315920 (published on June 12, 2003)

An embodiment of the present invention is to provide a ship engine and a gas discharge device of a fuel gas supply system which can safely treat remaining high-pressure fuel gas by discharging it into water.

An embodiment of the present invention is to provide a ship engine and a gas discharge device of a fuel gas supply system capable of preventing a danger such as a fire or an explosion that may occur in a gas discharge process.

An embodiment of the present invention seeks to provide a ship engine and a gas discharge device of a fuel gas supply system that can easily discharge high-pressure fuel gas as a simple structure.

According to an aspect of the present invention, there is provided a fuel cell system including a first gas discharge line, one end of which is connected to a fuel gas supply system that processes and supplies fuel gas stored in a storage tank to meet the requirements of the engine, And the other end of the first gas discharge line and the other end of the second gas discharge line are connected to each other or in the water of the outer surface of the hull so that the fuel gas remaining in the fuel gas supply system or the engine And a gas discharge device of the fuel gas supply system may be provided.

Wherein the engine includes a high-pressure gas injection engine that is operated by receiving a high-pressure fuel gas, and a low-pressure gas injection engine that operates by receiving low-pressure fuel gas, wherein the fuel gas supply system supplies high- And a second fuel supply line for supplying a low-pressure fuel gas to the low-pressure gas injection engine, wherein the first gas discharge line is connected to the first fuel supply line Pressure gas discharge line and one end of which is connected to the second fuel supply line, and the other end of the first high-pressure gas discharge line and the other end of the first low-pressure gas discharge line The engine of the ship and the fuel gas supply system connected to the water of the outer surface of the hull or joining with the other end of the second gas discharge line and connected to the water of the outer surface of the hull, A discharge device may be provided.

The second gas discharge line includes a second high pressure gas discharge line having one end connected to the high pressure gas injection engine and a second low pressure gas discharge line having one end connected to the low pressure gas injection engine, And the other end of the discharge line and the other end of the second low-pressure gas discharge line are connected to each other in the water of the outer surface of the hull or joined together with the other end of the first gas discharge line, A gas discharge device may be provided.

Wherein the first gas discharge line and the second gas discharge line are respectively provided with valves for controlling the passage or blocking of the remaining fuel gas, or a point where the first gas discharge line and the other end of the second gas discharge line join The engine of the ship and the gas discharge device of the fuel gas supply system provided with valves for regulating passage or interruption of the remaining fuel gas may be provided.

The first high-pressure gas discharge line and the first low-pressure gas discharge line may be provided with a valve for controlling passage or interruption of the remaining fuel gas, and a gas discharge device for the fuel gas supply system.

The second high-pressure gas discharge line and the second low-pressure gas discharge line may be provided with a valve for controlling passage or blocking of the remaining fuel gas, respectively, and a gas discharge device of the fuel gas supply system.

And the other end of the first gas discharge line and the other end of the second gas discharge line are connected to each other or joined to the outer surface of the ship front side of the propeller of the ship to transfer the fuel gas remaining in the fuel gas supply system or the engine to the propeller An engine of the ship and a gas discharge device of the fuel gas supply system may be provided that discharge the water to the front side to reduce the vibration excitation force generated in the propeller.

The engine of the ship and the gas discharge device of the fuel gas supply system according to the embodiment of the present invention have an effect of discharging the high pressure fuel gas remaining in the high pressure gas injection engine or the fuel gas supply system to water and safely treating it.

The engine of the ship and the gas discharge device of the fuel gas supply system according to the embodiment of the present invention have the effect of minimizing the risk of fire or explosion that may occur during the gas discharge process.

The engine of the ship and the gas discharge device of the fuel gas supply system according to the embodiment of the present invention have a simple structure and have the effect of easily discharging the residual high-pressure fuel gas.

1 is a schematic view showing a state in which a ship's engine and a gas discharge device of a fuel gas supply system are installed on a ship according to an embodiment of the present invention.
2 is a view showing a gas exhausting apparatus of a ship engine and a fuel gas supply system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a schematic view showing a state where a gas exhausting apparatus 100 of a fuel engine and a fuel gas supply system of a ship according to an embodiment of the present invention is installed on a ship. FIG. 2 is a cross- (100) of an engine and a fuel gas supply system.

Referring to FIG. 1, the ship includes a propeller 4 provided at the stern and generating power by propelling the propeller 4 by rotation, an engine 20 providing power to the propeller 4, The fuel gas supply system 10 for treating and supplying fuel gas and the fuel gas remaining in the engine 20 or the fuel gas supply system 10 when shutting down the engine 20 or shutting off the supply of the fuel gas in an emergency, And a gas exhausting device 100 for exhausting the gas exhausted to the outside.

The engine 20 and the fuel gas supply system 10 described below may be constructed in the same manner as the engine 20 and the fuel gas supply system 10 of the present invention, And the fuel gas supply system 10, the specific configuration of the engine 20 and the fuel gas supply system 10 can be configured differently from those described in this embodiment.

Here, the liquefied fuel may be any one of LNG, LPG, and DME (Dimethylether) that can be stored in a liquefied state. However, the present invention is not limited thereto. For convenience, the liquefied fuel is LNG.

The engine 20 includes a high-pressure gas injection engine 21 requiring a fuel gas supply at a pressure of approximately 150 to 300 bar, such as an ME-GI engine, and a low-pressure gas injection engine 21, And a low pressure gas injection engine 22 in which the supply of fuel gas at a pressure of ~ 7 bar is required. Here, the term high pressure means a pressure range for supplying the fuel gas to the high pressure gas injection engine 21, that is, a pressure of about 150 to 300 bar, and the term low pressure means that the low pressure gas injection engine 22 supplies the fuel gas Pressure range, i.e., a pressure of about 5 to 7 bar.

The high-pressure gas injection engine 21 and the low-pressure gas injection engine 22 may be provided as a dual fuel engine capable of using not only natural gas but also heavy fuel oil (HFO) The low pressure gas injection engine 22 may be a power generation engine that supplies power to various facilities in the ship such as the DFDE engine 20. [

1 and 2, the fuel gas supply system 10 includes a storage tank 2 for storing an LNG, a first fuel supplying the LNG of the storage tank 2 as a fuel to the high-pressure gas injection engine 21, A high-pressure pump 40 for pressurizing and sending the LNG, and a high-pressure vaporizer 50 for vaporizing the pressurized LNG, and the evaporation gas generated in the storage tank 2 is supplied to the low-pressure gas injection engine 22, a second fuel supply line 12 for supplying the fuel as a fuel, an evaporative gas compressor 70 for compressing the evaporative gas, and a re-liquefier 80 for re-liquefaction of the evaporated gas.

Herein, the ship to which the fuel gas supply system 10 is applied is not limited to a ship such as an LNG carrier, an LNG carrier, a container ship, and a general merchant ship employing the high-pressure gas injection engine 21 but also a floating marine plant such as LNG FPSO, LNG FSRU .

The storage tank 2 may be an LNG fuel tank for storing the LNG as fuel or an LNG cargo tank provided for the LNG carrier. In LNG carrier, LNG stored in cargo tank can be used as fuel. This storage tank 2 can maintain the internal pressure at about 1 bar and the internal LNG can be maintained at about -163 degrees Celsius (liquefaction temperature at normal pressure).

The storage tank 2 is provided with a vent mast 3 for discharging the evaporation gas to the atmosphere to prevent the pressure inside the storage tank 2 from rising due to the accumulation of the evaporation gas generated by evaporation of the LNG stored in the storage tank 2 ). The vent mast 3 may be provided in the form of a chimney in the upper part of the storage tank 2 to reduce the possibility of ignition and explosion in the process of discharging the evaporative gas.

The high-pressure pump (40) is installed in the first fuel supply line (11). The high-pressure pump 40 extracts the LNG from the storage tank 2, raises the fuel gas supply pressure of the high-pressure gas injection engine 21 to 150 to 300 bar, and sends it to the high-pressure vaporizer 50. The high-pressure pump 40 may be a reciprocating pump that can easily raise the LNG of the storage tank 2 to a high pressure of 150 to 300 bar.

The high-pressure vaporizer 50 vaporizes the high-pressure LNG delivered from the high-pressure pump 40 and sends it to the high-pressure gas injection engine 21 side. At this time, the NG supplied from the high-pressure vaporizer 50 to the high-pressure gas injection engine 21 can be adjusted to match the fuel gas supply conditions (pressure, temperature) of the high-pressure gas injection engine 21. [ Although not shown in the drawing, the first fuel supply line 11 between the high-pressure vaporizer 50 and the high-pressure gas injection engine 21 is provided with a means capable of controlling the temperature through heating or the like and a pressure tank Adjustable means may be provided.

The evaporation gas compressor 70 of the second fuel supply line 12 compresses the evaporation gas of the storage tank 2 to a pressure of 5 to 7 bar which is the fuel gas supply pressure of the low pressure gas injection engine 22, (22) so that the evaporation gas of the storage tank (2) can be used as fuel.

In a state in which the low-pressure gas injection engine 22 is not operated, the evaporation gas may be compressed using the evaporative gas compressor 70, and then re-liquefied through the re-liquefier 80 to be stored again in the storage tank 2 . The re-liquefier 80 may include a refrigerator with a compressor, a condenser, an expansion device, and an evaporator using nitrogen gas as a refrigerant. When the pressure of the storage tank 2 is likely to rise excessively due to the evaporation gas in a state where the low pressure gas injection engine 22 is not operated, the evaporation gas 2 is supplied through the vent mast 3 provided in the storage tank 2, To the atmosphere.

On the other hand, when the high-pressure gas injection engine 21 or the low-pressure gas injection engine 22 is shut down or the supply of the fuel gas in an emergency is interrupted, the high-pressure pump 30 of the first fuel supply line 11, The high-pressure fuel gas remaining in the first fuel supply line 11 and the high-pressure gas injection engine 21 can exert a large load due to the difference in pressure with the atmospheric pressure because the LNG is raised at a high pressure of 150 to 300 bar. Further, even if the low-pressure gas injection engine 22 supplies the relatively low-pressure fuel gas, when the fuel gas remains in the second fuel supply line 12 and the low-pressure gas injection engine 22, Pressure gas injection engine 12 and the low-pressure gas injection engine 22 may be loaded. Therefore, there is a need to safely discharge the fuel gas remaining in the fuel gas supply system 10 and the engine 20 to the outside.

Reflecting this point, there is provided a gas exhausting apparatus 100 for exhausting the fuel gas remaining in the fuel gas supply system 10 and the engine 20 into water. The gas exhausting apparatus 100 is connected to the fuel gas supply system 10 at one end and independently connected to the water of the outer surface of the hull 1 or to the second gas exhausting line 120, A first gas discharge line 110 connected to the outside of the hull 1 and connected to the engine 20 at one end and independently connected to the outside of the hull 1 or joined with the first gas discharge line 110 And a second gas discharge line (120) connected to the outside of the hull (1).

The first gas discharge line 110 includes a first high-pressure gas discharge line 111 having one end connected to the first fuel supply line 11 and a second high-pressure gas discharge line 111 having one end connected to the second fuel supply line 12 And a low-pressure gas discharge line 112. The other ends of the first high-pressure gas discharge line 111 and the first low-pressure gas discharge line 112 may be independently connected to each other in the water of the outer surface of the hull 1 or joined together in the water of the outer surface of the hull 1 have. But may be joined to the other end of the second gas discharge line 120 and connected to the outside of the hull 1 as one outlet.

2 and the present embodiment, one end of the first high-pressure gas discharge line 111 is connected to the downstream of the high-pressure vaporizer 50 and one end of the first low-pressure gas discharge line 112 is connected to the downstream of the evaporative gas compressor 70 The first fuel supply line 11 and the second fuel supply line 12 may be provided in various configurations. In this case, the fuel gas is supplied to the fuel supply line in a compressed state, In case of residual fuel supply lines and other facilities can be connected to various points as long as the load can be applied to them.

The second gas discharge line 120 includes a second high-pressure gas discharge line 121, one end of which is connected to the high-pressure gas injection engine 21, and a second low-pressure gas discharge line 122, (Not shown). The other ends of the second high-pressure gas discharge line 121 and the second low-pressure gas discharge line 122 may be independently connected to each other in the water of the outer surface of the hull 1 or joined together in the water of the outer surface of the hull 1 And may be joined to the other end of the first gas discharge line 110 to be connected to the outside of the hull 1 as one outlet.

As described above, the first gas discharge line 110 including the first high-pressure gas discharge line 111 and the first low-pressure gas discharge line 112, and the second gas discharge line 110 including the second high-pressure gas discharge line 121, The other end of the second gas discharge line 120 including the first gas discharge line 122 is discharged into the water by the discharge port on the outer surface of the independent body of the hull 1 or is merged together and discharged into the water through one discharge port, The risk of fire or explosion can be significantly reduced compared with the case of discharging the remaining fuel gas.

In particular, since the fuel gas remaining in the first fuel supply line 11 and the high-pressure gas injection engine 21 has a high pressure, there is a possibility that a safety accident may occur due to a large pressure difference when the fuel gas is released into the atmosphere. However, when the first high-pressure gas discharge line 111 and the second high-pressure gas discharge line 121 are connected to the first fuel supply line 11 and the high-pressure gas injection engine 21, respectively, It is possible to prevent safety accidents and prevent equipment damage.

On the other hand, since the propeller 4 provided at the stern and generating propulsive force on the ship by rotation rotates in water, the fluid pressure due to the rotation is transmitted to the bottom surface of the hull 1 and the residence of the hull 1 Thereby causing the hull 1 to vibrate. In order to prevent this, a vibration exciter force reduction device for reducing the vibration generated in the hull 1 by ejecting a fluid in front of the propeller is used.

The principle of such an apparatus is applied to the gas exhaust apparatus 100 so that the respective outlets of the first gas discharge line 110 and the second gas discharge line 120 or one combined discharge port are located forward of the propeller 40 As shown in FIG. The remaining fuel gas is ejected from the front of the propeller 4 toward the propeller 4 through an outlet provided near the front of the propeller 4 so that the same effect as the vibration exciter of the hull 1 can be obtained Can be obtained.

In addition, by providing an exhaust port in the stern side close to the engine room, the distance for installing the remaining fuel gas can be minimized.

The gas discharge device 100 needs to be closed for stable operation of the fuel gas supply system 10 and the engine 20 in the process of discharging the remaining fuel gas and the first high pressure gas discharge line 111 And the pressure of the fuel gas passing through the second high-pressure gas discharge line 121 is higher than the pressure of the fuel gas passing through the first low-pressure gas discharge line 112 and the second low-pressure gas discharge line 122, There is a risk that the fuel gas will flow back to the first and second low-pressure gas discharge lines 112 and 122 side.

A valve 30 may be provided in each of the first gas discharge line 110 and the second gas discharge line 120 or a valve 30 may be provided in the first gas discharge line 110 and the second gas discharge line 120, When the other ends join together and are connected to the outside of the hull 1, the valve 30 may be provided after the joining point. The valve 30 may be provided in the first high-pressure gas discharge line 111 and the first low-pressure gas discharge line 112. Similarly, the second high-pressure gas discharge line 121 and the second low- Line 122, respectively.

The valve 30 is provided with a sensor (not shown) for sensing the pressure of each gas discharge line for efficiency and rapid operation of the operation, although the operator can manually adjust the opening and closing. The opening and closing of the gas discharge line may be controlled.

In the case of the first low-pressure gas discharge line 112 and the second low-pressure gas discharge line 122, the remaining fuel gas is relatively low in pressure, Pressure gas discharge line 122 is connected to the vent mast 3 installed in the first and second high-pressure gas discharge lines 122 to discharge the remaining low-pressure fuel gas to the atmosphere through the vent mast 3, The gas discharge line 121 may be connected to the outer surface of the hull 1 so as to be discharged into the water.

As described above, the gas exhaust apparatus 100 of the engine and the fuel gas supply system according to the present embodiment discharges the high-pressure fuel gas remaining in the engine 20 and the fuel gas supply system 10 into the water, The risk can be minimized and it can have the effect of reducing the vibration excitation force of the marine propeller 4. In addition, since the existing fuel gas can be easily discharged as a simple structure while using existing equipment as it is, the installation cost can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

1: Hull 2: Storage tank
10: fuel gas supply system 11: first fuel supply line
12: second fuel supply line 20: engine
21: high pressure gas injection engine 22: low pressure gas injection engine
30: valve 100: gas discharge device
110: first gas discharge line 111: first high-pressure gas discharge line
112: first low-pressure gas discharge line 120: second gas discharge line
121: second high-pressure gas discharge line 122: second low-pressure gas discharge line

Claims (7)

A first gas discharge line connected to a fuel gas supply system which processes and supplies the fuel gas stored in the storage tank to the requirements of the engine; And
And a second gas discharge line, one end of which is connected to the engine,
The other end of the first gas discharge line and the other end of the second gas discharge line join together or join together in the water of the outer surface of the hull,
An engine of a ship for discharging the fuel gas remaining in the fuel gas supply system or the engine, and a gas discharge device of the fuel gas supply system. The method according to claim 1,
Wherein the engine includes a high-pressure gas injection engine that operates by receiving a high-pressure fuel gas, and a low-pressure gas injection engine that operates by receiving low-pressure fuel gas,
Wherein the fuel gas supply system includes a first fuel supply line for supplying a high-pressure fuel gas to the high-pressure gas injection engine, and a second fuel supply line for supplying a low-pressure fuel gas to the low-pressure gas injection engine,
The first gas discharge line
A first high-pressure gas discharge line, one end of which is connected to the first fuel supply line, and a first low-pressure gas discharge line, one end of which is connected to the second fuel supply line,
The other end of the first high-pressure gas discharge line and the other end of the first low-pressure gas discharge line are connected to each other in the water of the outer surface of the hull or join with the other end of the second gas discharge line, Of the engine and the gas exhaust system of the fuel gas supply system. 3. The method of claim 2,
The second gas discharge line
A second high-pressure gas discharge line, one end of which is connected to the high-pressure gas injection engine, and a second low-pressure gas discharge line, one end of which is connected to the low-pressure gas injection engine,
The other end of the second high-pressure gas discharge line and the other end of the second low-pressure gas discharge line are connected to each other in the water of the outer surface of the hull or joined together with the other end of the first gas discharge line, Gas exhaust system of a fuel gas supply system. The method according to claim 1,
Wherein the first gas discharge line and the second gas discharge line are respectively provided with valves for regulating passage or blocking of the remaining fuel gas,
Wherein a valve is provided for regulating passage or blocking of the remaining fuel gas after a point where the first gas discharge line and the other end of the second gas discharge line join together. 3. The method of claim 2,
Wherein the first high-pressure gas discharge line and the first low-pressure gas discharge line are respectively provided with valves for controlling passage or interruption of the remaining fuel gas. The method of claim 3,
Wherein the second high-pressure gas discharge line and the second low-pressure gas discharge line are respectively provided with valves for regulating passage or interruption of the remaining fuel gas. The method according to claim 1,
And the other end of the first gas discharge line and the other end of the second gas discharge line are joined or joined together in the water on the outer surface of the front side of the propeller of the ship,
Wherein the fuel gas supply system or the engine discharges the fuel gas remaining in the engine toward the front side of the propeller to reduce the vibration excitation force generated in the propeller.

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