KR101276123B1 - Fuel gas supply system for high pressure gas injection engine - Google Patents

Abstract

The present invention relates to a fuel gas supply system for supplying LNG or boil-off gas discharged from an LNG fuel tank to a high-pressure gas injection engine as a fuel.
According to the present invention, there is provided a fuel gas supply system for a high pressure gas injection engine of a ship having an LNG fuel tank, a high pressure pump, a vaporizer, and a high pressure gas injection engine, wherein when the load of the high pressure gas injection engine is increased, the fuel gas is previously released from the vaporizer. The fuel gas supply system for a high pressure gas injection engine of a ship, characterized by being able to additionally supply fuel gas to the high pressure gas injection engine from a buffer tank, which is supplied and stored, to follow the load variation of the high pressure gas injection engine. Is provided.

Description

Fuel gas supply system for high pressure gas injection engine {FUEL GAS SUPPLY SYSTEM FOR HIGH PRESSURE GAS INJECTION ENGINE}

The present invention relates to a fuel gas supply system for supplying LNG or boil-off gas discharged from an LNG fuel tank to a high-pressure gas injection engine as a fuel, and a load of a high-pressure gas injection engine that is rapidly changed by installing a buffer tank in the middle of a fuel supply line. The present invention relates to a fuel gas supply system capable of smoothly following.

In general, it is nitrogen oxides (NOx) and sulfur oxides (SOx) that are regulated by the International Maritime Organization among the waste gas discharged from ships, and is trying to regulate the emission of carbon dioxide (CO ₂ ). Particularly, in the case of nitrogen oxide (NOx) and sulfur oxides (SOx), it was submitted through the Protocol of the Maritime Pollution Prevention Convention (MARPOL) in 1997, In May, the requirements for the fermentation were satisfied and the regulations are being implemented.

Therefore, in order to meet these regulations, various methods have been introduced to reduce NOx emissions. Among these methods, a high pressure natural gas injection engine, for example, a ME-GI engine, has been developed and used for LNG carriers. .

Such a ME-GI engine is an offshore structure such as an LNG carrier for storing and transporting LNG (Liquefied Natural Gas) in a cryogenic storage tank (in the present specification, the offshore structure is a vessel such as an LNG carrier, an LNG RV, or a commercial vessel). , LNG FPSO, LNG FSRU, and even offshore plants.) In this case, natural gas is used as fuel, and the load is approximately 150 to 300 bara (absolute pressure). High pressure gas supply pressure is required.

In order to apply ME-GI engines to commercial ships without LNG storage tanks, LNG fuel tanks that can accommodate LNG as fuel are installed.

The ME-GI engine will use Boil Off Gas (BOG) as a fuel if additional liquefaction equipment is installed if necessary, depending on changes in gas and fuel oil prices and the degree of regulation of emissions. Alternatively, it is possible to re-liquefy the boil-off gas to the storage tank and use heavy fuel oil (HFO) .In particular, LNG can be easily vaporized when passing through a sea area subject to specific regulations related to environmental pollution. It can be used as a next-generation environmentally friendly engine, which is nearly 50% efficient and can be used as the main engine of LNG carriers in the future.

In order to supply LNG (or evaporated gas) contained in the LNG storage tank (or LNG fuel tank) to the ME-GI engine as fuel, a fuel gas supply system must be provided.

Examples of such fuel gas supply systems are disclosed in WO 2009/011497, WO 2009/136793, and the like.

International Patent Publication No. WO 2009/011497 discloses that vaporized LNG discharged from an LNG storage tank is vaporized in a vaporizer and then supplied to a high-pressure gas injection engine such as an ME-GI engine, and the boil-off gas discharged from the LNG storage tank is described above. A fuel gas supply system for liquefying heat exchange with LNG in a vaporizer is disclosed.

International Patent Publication No. WO 2009/136793 discloses that LNG discharged from an LNG storage tank is compressed by a high pressure pump and then evaporated in an evaporator to be supplied to a gas engine such as a ME-GI engine, and at the same time evaporated from the LNG storage tank. A fuel gas supply system is disclosed in which a gas is compressed in an evaporative gas compressor and then liquefied in a cryogenic heat exchanger, mixed with LNG supplied to a high pressure pump, and supplied to a gas engine.

Such a fuel gas supply system is essential for supplying fuel gas in a state required by the engine, that is, a temperature and pressure required by the engine. During the operation of the ME-GI engine, the load is changed according to the output required by the engine, and the specifications of the various components constituting the fuel gas supply system are determined so as to smoothly follow the engine load over time. That is, in order to smoothly follow the engine load, the size and capacity of various components need to be increased, and accordingly, there is a problem in that the cost of constructing the fuel gas supply system increases.

On the other hand, the fuel gas supply system is generally provided with a transfer means such as a reciprocating pump as a means for transfer of LNG. Since the liquefaction temperature of LNG is cryogenic at about -163 ° C at ambient pressure, the pump used in the fuel gas supply system must be able to operate in cryogenic conditions. The cryogenic reciprocating pump for ships is configured to suck the liquid, that is, LNG, by the piston or plunger reciprocating in the cylinder, and discharge at the required pressure. Compared with other types of pumps, reciprocating pumps have advantages such as relatively high pressure gain, good flow rate, and no need for a separate flow control device. However, the continuous reciprocating motion to obtain high pressure causes the temperature rise of the lubricating oil injected into the pump for the purpose of lubrication between the connecting rod and the crankshaft, which can be a problem during long time driving.

As described above, a problem due to a rise in the temperature of the lubricating oil may be caused on the driving side of the reciprocating pump, whereas an icing phenomenon occurs on the connection side between the discharge unit for sucking and discharging LNG and the driving unit for driving the discharge unit. there is a problem. That is, since LNG is a cryogenic fluid at about -163 ° C. at atmospheric pressure, the discharge part is cooled by the LNG. As the cooling heat is transferred to the connection part, freezing is generated in the connection part as time passes. As a result, not only the efficiency of the pump may be lowered but also the internal parts of the pump may be damaged.

The present invention is to solve the conventional problems as described above, it is possible to store a predetermined amount of high-pressure gas upstream of the ME-GI engine to smoothly follow the engine load during operation of the ME-GI engine. It is intended to provide a fuel gas supply system for a high pressure gas injection engine that supplies a high pressure gas in a butter tank to an engine when an engine load is increased by installing a buffer tank.

According to the present invention for achieving the above object, as a fuel gas supply system for a high-pressure gas injection engine for vaporizing the LNG stored in the LNG storage tank to supply as a fuel gas to the high-pressure gas injection engine, increasing the load of the high-pressure gas injection engine High-pressure gas injection, characterized in that the fuel gas can be supplied to the high-pressure gas injection engine from a buffer tank that receives the fuel gas from the vaporizer in advance and can keep track of the load variation of the high-pressure gas injection engine. A fuel gas supply system for an engine is provided.

By providing opening and closing means such as the buffer tank and the control valve upstream of the high pressure gas injection engine of the fuel gas supply system, a system having a buffer tank filling mode, a direct gas supply mode, a buffer tank using mode, etc. is rapidly changed. Follow the load.

The buffer tank is not insulated so that the fuel gas contained inside the buffer tank can be heated by heat from the outside. As the gas heater is installed downstream of the buffer tank and the fuel gas is discharged from the buffer tank, the fuel gas can be heated to an appropriate temperature required by the engine when a temperature drop accompanied with the decompression occurs.

The buffer tank is preferably arranged in parallel with the fuel supply line for supplying fuel gas to the high-pressure gas injection engine.

The buffer tank is branched from a fuel supply line for supplying fuel gas to the high pressure gas injection engine and connected to the buffer tank, and through a use line extending from the buffer tank and joined to the fuel supply line. It can be arranged in parallel with the fuel supply line.

The filling line may be provided with a check valve that opens when the fuel gas is supplied to the buffer tank, and the bypass line may be installed in the use line when the fuel gas stored in the buffer tank is supplied to the high pressure gas injection engine. have. The fuel supply line may be provided with a control valve for adjusting the flow rate to control the amount of fuel meeting the engine conditions, and an on / off valve as a master valve having a shut off function.

According to another aspect of the present invention, a fuel gas supply system for a high-pressure gas injection engine for vaporizing the LNG stored in the LNG storage tank to supply as a fuel gas to the high-pressure gas injection engine, the LNG discharged from the LNG storage tank A high pressure pump compressing the pressure required by the gas injection engine; A vaporizer for vaporizing the LNG compressed by the high pressure pump; A buffer tank storing LNG vaporized in the vaporizer from the vaporizer; Includes, when the load of the high-pressure gas injection engine is increased to fluctuate beyond the capacity of the high-pressure pump or the carburetor, characterized in that for supplying the vaporized LNG stored in the buffer tank to the high-pressure gas injection engine A fuel gas supply system for a high pressure gas injection engine is provided.

According to another aspect of the present invention, a fuel gas supply method for a high-pressure gas injection engine for vaporizing the LNG stored in the LNG storage tank to supply as a fuel gas to the high-pressure gas injection engine, when increasing the load of the high-pressure gas injection engine, A fuel gas supplying method for a high pressure gas injection engine is provided, wherein the fuel gas is supplied from the buffer tank storing the fuel gas to the high pressure gas injection engine so as to follow the load variation of the high pressure gas injection engine. .

The fuel gas supply method may include supplying vaporized LNG to the buffer tank and filling the buffer tank with vaporized LNG as fuel gas.

In the fuel gas supply method, when the load required by the high pressure gas injection engine does not exceed the capacity of the pump and the vaporizer installed in the fuel supply line, the vaporized LNG as fuel gas is supplied to the high pressure gas injection engine in the vaporizer. It may include the step of supplying.

In the fuel gas supply method, when the load required by the high pressure gas injection engine fluctuates beyond the capacity of the pump or the vaporizer installed in the fuel supply line, vaporization of the fuel gas from the buffer tank as the fuel gas from the buffer tank is performed. It may include the step of supplying the LNG.

According to the present invention, when the engine load increases by installing a buffer tank capable of storing a predetermined amount of high pressure gas upstream of the ME-GI engine so as to smoothly follow the engine load during operation of the ME-GI engine. A fuel gas supply system for a high pressure gas injection engine for supplying a high pressure gas in a butter tank to an engine may be provided.

According to the fuel gas supply system of the present invention, it is possible to provide ease of use, efficiency, and an optimal operating environment with only a configuration of a buffer tank, a control valve, a heater, and the like, without much facility investment cost, and also has excellent load followability. .

1 is a schematic configuration diagram of a fuel gas supply system for a high pressure gas injection engine according to the present invention.
2 is a view for explaining the buffer tank filling mode of the fuel gas supply system for a high-pressure gas injection engine according to the present invention.
3 is a view for explaining a direct gas supply mode of the fuel gas supply system for a high-pressure gas injection engine according to the present invention.
4 is a view for explaining a buffer tank use mode of the fuel gas supply system for a high-pressure gas injection engine according to the present invention.
5 to 8 are views for explaining a cooling apparatus according to various embodiments of the reciprocating pump of the fuel gas supply system for a high-pressure gas injection engine according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

1 is a block diagram showing a fuel gas supply system of an offshore structure having a high-pressure gas injection engine, for example, a ME-GI engine according to the present invention. The fuel gas supply system for the high pressure gas injection engine of the present invention includes all kinds of offshore structures that can use liquefied natural gas as a fuel of the high pressure gas injection engine, that is, vessels such as LNG carriers, LNG RVs, container ships, general commercial ships, etc. It can be applied to offshore plants such as LNG, FPSO and LNG FSRU.

In the case of an offshore structure equipped with an LNG storage tank for storing or transporting LNG, such as an LNG carrier, the LNG in the LNG storage tank is supplied as a fuel to the high-pressure gas injection engine. In the case of offshore structures that do not have a separate LNG storage tank for storing or transporting LNG, such as container ships or commercial ships, LNG is discharged from the LNG fuel tank that stores LNG as fuel and supplied to the high-pressure gas injection engine. do. However, in the present specification, the LNG storage tank should be understood as a concept including an LNG fuel tank.

According to the fuel gas supply system of the offshore structure having the high-pressure gas injection engine according to the present invention, the LNG (or boil-off gas) discharged from the LNG storage tank (or LNG fuel tank) (not shown), the fuel supply line (L1) While being conveyed through the pump 20 is compressed to high pressure and vaporized in the carburetor 5 is supplied as fuel to the high-pressure gas injection engine 1, such as ME-GI engine. In the case of the boil-off gas may be mixed with the LNG to be liquefied and then transported to the high-pressure gas injection engine.

The upstream side of the vaporizer | carburetor 5 is provided with the pulsation damper 3 for absorbing and reducing pulsation on a liquid surface as cryogenic equipment. The pump 20 is preferably a reciprocating pump capable of pressurizing LNG by applying to cryogenic temperatures. The pump 20 is a high pressure pump capable of compressing LNG to a high pressure of about 150 to 300 bara. As used herein, the term "high pressure" means a pressure range of a fuel gas required by a gas engine such as a ME-GI engine, for example, a pressure in the range of about 150 to 300 bara.

The vaporizer | carburetor 5 is a high pressure vaporizer, and heats and vaporizes liquid LNG by heat-exchanging with a heat medium.

At initial start-up, the fuel supply line (L1) may be injected with liquid nitrogen (LN2) for cooling the system, and the liquid nitrogen injected into the fuel supply line (L1) is a liquid nitrogen discharge line downstream of the vaporizer (5). It can be discharged to the outside through (L2). Liquid nitrogen discharge line (L2) may be provided with a silencer (not shown).

According to the present invention, between the vaporizer 5 and the high-pressure gas injection engine 1 of the fuel supply line (L1) is provided a buffer tank (11) capable of receiving a predetermined amount of fuel gas at a high pressure. The buffer tank 11 is not insulated and may be affected by the external environment. When the external temperature of the buffer tank 11 is higher than the temperature of the fuel gas contained in the buffer tank 11, the fuel gas contained in the buffer tank 11 may be heated by heat supplied from the outside. The buffer tank 11 has a structure capable of withstanding a pressure of approximately 300 bar, and may have a structure such as a storage tank for CNG.

The buffer tank 11 is connected in parallel with the fuel supply line L1 through the filling line L3 and the use line L4. The check valve 12 is installed in the filling line L3, and the bypass valve 13 is installed in the use line L4. In the fuel supply line L1, a control valve 14 for adjusting the flow rate to control the amount of fuel corresponding to the engine condition, an on / off valve 15 as a master valve having a shut off function, and the engine condition Gas heaters 16 for adjusting the temperature of the fuel in accordance with are sequentially installed from the upstream side to the downstream side. The control valve 14 is installed downstream of the point where the filling line L3 branches in the fuel supply line L1 and upstream of the point where the use line L4 is connected. The on-off valve 15 and the gas heater 16 are installed in the downstream side of the point where the use line L4 is connected in the fuel supply line L1.

The fuel gas supply system having a buffer tank can be operated in a buffer tank filling mode, a direct gas supply mode, a buffer tank use mode, and the like, as necessary. Each mode will be described in detail with reference to FIGS. 2 to 4. 2 to 4, hatching the inside of the valve means that the valve is open, and no hatching inside the valve means that the valve is closed.

The buffer tank filling mode will be described with reference to FIG. 2. In order to fill the fuel tank 11 with fuel gas, the check valve 12 is opened, and the bypass valve 13, the control valve 14, and the open / close valve 15 are closed. When the check valve 12 is opened, the fuel gas (that is, natural gas) compressed to a high pressure of about 300 bar is supplied to the buffer tank 11 through the filling line L3. When filling of the gas fuel to the buffer tank 11 is completed, the check valve 12 is closed.

A direct gas supply mode will be described with reference to FIG. 3. When the high-pressure gas injection engine 1 is operated, when the required load does not fluctuate rapidly, the fuel gas is supplied from the vaporizer 5 through the fuel supply line L1. At this time, the check valve 12 and the bypass valve 13 are closed, and the control valve 14 and the open / close valve 15 are opened. When in the direct gas supply mode, by adjusting the opening degree of the check valve 12, the filling of the buffer tank 11 can proceed simultaneously.

A buffer tank use mode will be described with reference to FIG. 4. When the high pressure gas injection engine 1 is operated, when the required load suddenly changes, such as during initial start-up or output sudden increase, sufficient fuel is supplied to the high pressure gas injection engine 1 only by supplying fuel from the vaporizer 5. Can't supply At this time, the check valve 12 and the control valve 14 are closed, the bypass valve 13 and the opening / closing valve 15 are opened, and the fuel gas stored in the buffer tank 11 is supplied to the high pressure gas injection engine 1. do.

In this way, when the load of the high-pressure gas injection engine 1 fluctuates rapidly, the fuel gas stored in the buffer tank is used to cope with the load fluctuation. In the present specification, the term "when the load of the high pressure gas injection engine 1 fluctuates rapidly" means that the pump 20 or the carburetor in which the load required by the high pressure gas injection engine 1 is installed in the fuel supply line L1. (5) It means the case of fluctuating beyond the capacity of equipment.

According to the present invention, even if the load required by the high-pressure gas injection engine 1 fluctuates beyond the capacity of equipment such as the pump 20 or the vaporizer 5 installed in the fuel supply line L1, the buffer tank 11 It is possible to cope with a suddenly changing load. Accordingly, it is not necessary to satisfy the load maximum value of the high-pressure gas injection engine 1 in which the size and capacity of the various components change rapidly, and the size and capacity of the various components do not need to be excessively large, and to configure the fuel gas supply system. To reduce the cost.

As the fuel gas is discharged from the buffer tank 11, when the internal pressure of the buffer tank is reduced, the temperature of the discharged fuel gas may decrease. In this case, when the temperature of the fuel gas falls below the temperature required by the engine, the fuel gas may be heated by the gas heater 16 and then supplied to the engine.

5 to 8, a cooling apparatus according to various embodiments of a reciprocating pump of a fuel gas supply system for a high pressure gas injection engine according to the present invention will be described.

The reciprocating pump 20 includes a drive unit 21 driven by a motor 22 and a discharge unit 25 that operates by the drive unit 21 and sucks fluid, that is, LNG, compresses and discharges the fluid to a predetermined pressure. ). The rotational force of the motor 22 may be transmitted to the driver 21 through the pulley 23. As the crankshaft of the drive unit 21 rotates, the piston or plunger of the discharge unit 25 compresses and discharges the fluid while reciprocating in the cylinder through a connecting unit such as a connecting rod.

A flexible hose 60 may be installed between the inlet of the pump 20 and the fuel supply line L1, so that the pipe constituting the fuel supply line L1 and the inlet of the pump 20 are not aligned correctly. If not, the connection can be easily performed.

Lubricating oil is injected into the driving unit 21 to lubricate the operation of the crankshaft and the connecting rod. As the operation of the pump 20 continues, the temperature of the lubricating oil rises, so it is necessary to cool the lubricating oil.

The cooling apparatus of the first embodiment shown in FIG. 5 includes a lubricating oil circulation line L5 for circulating lubricating oil into and out of the pump 20, and a radiator 31 installed in the lubricating oil circulation line L5 to cool the lubricating oil. And a lubricating oil pump 33 for circulating the lubricating oil. A plurality of valves 35, 36, and 37 may be installed in the lubricating oil circulation line L5. Lubricating oil circulation line (L5) constitutes a closed loop.

The cooling device of the second embodiment shown in FIG. 6 differs in that it uses a heat exchanger 41 instead of a radiator as compared to the cooling device of the first embodiment shown in FIG. The LNG, which is compressed and discharged from the pump 20, is partially bypassed and supplied to the heat exchanger 41 through the bypass line L6. Since the temperature of the LNG is relatively low compared to the lubricant, it is possible to cool the lubricant.

The cooling device of the third embodiment shown in FIG. 7 is different in that it uses a heat exchanger 45 instead of a radiator as compared to the cooling device of the first embodiment shown in FIG. The heat exchanger 45 may be supplied with sea water (or fresh water) or air for heat exchange with the lubricating oil.

The cooling device of the fourth embodiment shown in FIG. 8 is different from the cooling devices of the above-described first to third embodiments forming a closed loop in that the cooling device of the fourth embodiment is an open loop. The cooling apparatus of the fourth embodiment cools the drive unit 21 of the pump 20 by nitrogen supplied from the liquid nitrogen tank 51 through the nitrogen supply line L7. The supply amount of the liquid nitrogen can be adjusted by the on-off valve 52, the liquid nitrogen is preferably heated by the heater 53 is vaporized and then supplied to the pump 20.

It is supplied to the pump 20 to cool the driving unit 21 of the pump and the heated nitrogen itself is discharged to the outside of the pump 20 may be supplied to the connection portion 27 of the pump again. The amount of nitrogen supplied to the connection 27 can be controlled by the valve 55. The connection part 27 is positioned between the discharge part 25 and the drive part 21 to transmit the driving force of the drive part to the discharge part by the connecting rod 28 or the like.

The connecting portion 27 of the pump in which the connecting rod 28 or the like is disposed is cooled by continuously receiving cold heat from the discharge portion 25, and freezing may occur. However, the temperature of the connection portion 27 can be increased by supplying nitrogen heated in the drive portion 21 to the connection portion 27.

In addition, even if leakage of LNG occurs in the discharge part 25, the gas leaked by nitrogen passing through the connection part 27 is not transferred to the driving part 21, so that an explosion accident can be prevented in advance. At this time, the nitrogen gas supplied to the connecting portion 27 functions as a seal gas that isolates the discharge portion 25 and the driving portion 21 from each other.

Nitrogen discharged from the connection portion 27 may be discharged to the atmosphere as it is, or may be stored and reused in the nitrogen storage tank 57 through the nitrogen supply line (L7) if necessary.

In the above description, the fuel gas supply system and method of the present invention has been described as an example applied to an offshore structure such as an LNG carrier, but the fuel gas supply system and method of the present invention is used to supply fuel to a high-pressure gas injection engine on land. Of course, it can be applied.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

1: high pressure gas injection engine 5: vaporizer
11: buffer tank 16: gas heater
20: Pump

Claims (13)

A fuel gas supply system for a high pressure gas injection engine for vaporizing LNG stored in an LNG storage tank with a vaporizer and supplying the high pressure gas injection engine as fuel gas.
When the load of the high pressure gas injection engine is increased, the fuel gas may be supplied to the high pressure gas injection engine from a buffer tank in which fuel gas is received from the vaporizer and stored in advance to follow the load variation of the high pressure gas injection engine. And
When the temperature of the fuel gas discharged from the buffer tank is less than the temperature required by the engine, the high-pressure gas comprising a gas heater installed on the downstream side of the buffer tank so as to supply the engine after heating the fuel gas Fuel gas supply system for injection engines. The method according to claim 1,
The buffer tank is not insulated, it may be affected by the temperature of the external environment fuel gas supply system for a high-pressure gas injection engine, characterized in that. delete The method according to claim 1,
The buffer tank is a fuel gas supply system for a high pressure gas injection engine, characterized in that disposed in parallel with the fuel supply line for supplying fuel gas to the high pressure gas injection engine. The method according to claim 1,
The buffer tank is branched from a fuel supply line for supplying fuel gas to the high pressure gas injection engine and connected to the buffer tank, and through a use line extending from the buffer tank and joined to the fuel supply line. A fuel gas supply system for a high pressure gas injection engine, characterized in that arranged in parallel with the fuel supply line. The method according to claim 5,
The filling line is a fuel gas supply system for a high-pressure gas injection engine, characterized in that the check valve is installed when the fuel gas is supplied to the buffer tank is installed. The method according to claim 5,
The use line is a fuel gas supply system for a high-pressure gas injection engine, characterized in that the bypass valve which is opened when the fuel gas stored in the buffer tank is supplied to the high-pressure gas injection engine is installed. The method according to claim 5,
The fuel supply line, the high-pressure gas injection engine, characterized in that the control valve for adjusting the flow rate to control the amount of fuel in accordance with the engine conditions, and the on-off valve as a master valve having a shut off function is installed Fuel gas supply system. A fuel gas supply system for a high pressure gas injection engine for vaporizing LNG stored in an LNG storage tank and supplying the high pressure gas injection engine as fuel gas,
A high pressure pump for compressing LNG discharged from the LNG storage tank to a pressure required by the high pressure gas injection engine;
A vaporizer for vaporizing the LNG compressed by the high pressure pump;
A buffer tank storing LNG vaporized in the vaporizer from the vaporizer; Including;
When the load of the high pressure gas injection engine increases and fluctuates beyond the capacity of the high pressure pump or the vaporizer, vaporized LNG stored in the buffer tank is supplied to the high pressure gas injection engine.
When the temperature of the fuel gas discharged from the buffer tank is less than the temperature required by the engine, the high-pressure gas comprising a gas heater installed on the downstream side of the buffer tank so as to supply the engine after heating the fuel gas Fuel gas supply system for injection engines. A fuel gas supply method for a high pressure gas injection engine for vaporizing LNG stored in an LNG storage tank and supplying it as fuel gas to a high pressure gas injection engine,
When the load of the high-pressure gas injection engine is increased, the fuel gas may be supplied to the high-pressure gas injection engine from a buffer tank storing the fuel gas to follow the load variation of the high-pressure gas injection engine.
When the temperature of the fuel gas discharged from the buffer tank is less than the temperature required by the engine, the high-pressure gas injection engine, characterized in that the fuel gas is heated by a gas heater installed downstream of the buffer tank and supplied to the engine Fuel gas supply method. The method of claim 10,
And supplying vaporized LNG to the buffer tank to fill the buffer tank with vaporized LNG as fuel gas. The method of claim 10,
If the load required by the high pressure gas injection engine does not exceed the capacity of the pump and the vaporizer installed in the fuel supply line, supplying the vaporized LNG as fuel gas to the high pressure gas injection engine in the vaporizer; A fuel gas supply method for a high pressure gas injection engine, characterized in that. The method of claim 11,
If the load required by the high-pressure gas injection engine is changed beyond the capacity of the pump or vaporizer installed in the fuel supply line, supplying the vaporized LNG as fuel gas to the high-pressure gas injection engine from the buffer tank. Fuel gas supply method for a high-pressure gas injection engine comprising a.

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