WO2015105344A1

WO2015105344A1 - Fuel gas supply apparatus

Info

Publication number: WO2015105344A1
Application number: PCT/KR2015/000176
Authority: WO
Inventors: 이창우; 김낙현; 이준채; 장재호
Original assignee: 대우조선해양 주식회사
Priority date: 2014-01-09
Filing date: 2015-01-08
Publication date: 2015-07-16

Abstract

Disclosed is a fuel gas supply apparatus for supplying fuel gas to an engine installed inside a ship. The fuel gas supply apparatus of the present invention comprises: a gas supply system installed in a gas supply line through which fuel gas is supplied to the engine; a pump and a gasifier included in the gas supply system; and a partition wall for partitioning a space, in which the gas supply system is installed, into a first space and a second space, wherein at least a part of the pump is installed in the first space.

Description

Fuel gas supply system

The present invention relates to an apparatus for safely supplying fuel gas to an engine in a ship, and more particularly, to supply fuel gas to a high pressure engine in a fuel gas supply system when supplying fuel gas in a ship having a high pressure engine and a low pressure engine. The present invention relates to a fuel gas supply device capable of minimizing the influence on the entire fuel gas supply system even if the fuel gas leaks from the high pressure pump by installing a high pressure pump to supply a separate space.

Recently, the consumption of liquefied gas such as LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas) is increasing worldwide. The liquefied gas is transported in a gas state through a gas pipe on land or sea, or transported to a distant consumer while stored in a liquefied gas carrier in a liquefied state. Liquefied gas such as LNG or LPG is obtained by cooling natural gas or petroleum gas to cryogenic temperature (approximately -163 ℃ in case of LNG), and its volume is greatly reduced than in gas state, so it is very suitable for long distance transportation by sea. .

Liquefied gas carriers, such as LNG carriers, are used to load liquefied gas into the sea and unload this liquefied gas to land requirements.For this purpose, a storage tank (commonly called a 'cargo') that can withstand cryogenic temperatures of liquefied gas It includes).

As examples of offshore structures equipped with storage tanks capable of storing cryogenic liquefied gas, in addition to liquefied gas carriers, vessels such as LNG RV (Regasification Vessel), LNG FSRU (Floating Storage and Regasification Unit), and LNG FPSO (Floating, Production) , Plants such as Storage and Off-loading (BMPP) and Barge Mounted Power Plant (BMPP).

LNG RV is a LNG regasification facility installed on LNG carriers capable of magnetic navigation and floating. LNG FSRU is a structure that stores liquefied natural gas, which is unloaded from LNG carriers in a storage tank, and vaporizes liquefied natural gas to supply demand to land demand as needed. LNG FPSO is a marine natural gas. It is a structure used to directly liquefy and store in a storage tank after refining in, and to transfer the LNG stored in the storage tank to the LNG carrier if necessary. In addition, BMPP is a structure used to generate electricity at sea by mounting a power generation facility on a barge.

In the present specification, a vessel is a concept including all kinds of liquefied gas carriers such as LNG carriers, LNG RVs, and even plants such as LNG FPSO, Oil FPSO, LNG FSRU, and BMPP.

However, since natural gas is a flammable gas, in a ship carrying or using LNG, a zone where natural gas may flow is designated as a dangerous zone, and within this dangerous zone, an explosion or explosion may occur. Explosion proof equipment is used to prevent fire.

In particular, in recent years, when burning heavy oil, MDO (Marine Diesel Oil), etc., which are conventionally used as fuels for various engines in ships, the seriousness of environmental pollution due to various harmful substances contained in the exhaust gas is increasing. Regulations on various engines of ships using oil as fuel are being tightened, and costs for satisfying such regulations are gradually increasing.

Therefore, instead of using heavy oil or MDO oil as fuel oil or using only a minimal amount, an engine capable of using clean fuel, such as LNG, LPG, CNG, or DME, has been developed. It is being installed.

However, as mentioned earlier, clean fuels such as LNG are flammable materials, and when such materials are used as fuel in a propulsion or power generation engine, it is necessary to supply fuel to the engine at all times during the operation of the ship. It is necessary to secure the safety of the transport device of the combustible material installed in the.

As a result, research and development on the fuel gas supply device of the ship needs to be made continuously so that the fuel gas supply device installed on the ship can be safely used to supply the fuel gas as a combustible material to the engine from the fuel tank.

The present invention is to solve the conventional problems as described above, when transporting a fuel gas such as LNG in a vessel, fuel gas by installing a pump that is likely to leak the fuel gas in a separate space partitioned through the partition wall fuel gas To provide a fuel gas supply that can safely transport the risk of explosion or fire.

FIG. 1 is a view for explaining a fuel gas supply apparatus in a ship equipped with a high pressure engine and a low pressure engine.

A plurality of engines may be installed in the ship as needed, usually one or more main engines (e.g. MEGI engines) installed for propulsion and one or more secondary engines (e.g. DF engines) installed for power generation. This is installed. In general, since the pressure of the fuel gas required by the main engine is greater than the pressure of the fuel gas required by the sub engine, the sub engine is referred to as a low pressure engine 20 and the main engine is referred to as a high pressure engine 30.

In general, receiving the control of the off gas discharged from a vessel IMO (International Maritime Organization) and nitrogen oxides (NOx) and sulfur oxides (SOx), in recent years and tried also regulated emissions of carbon dioxide (CO ₂₎ have. In particular, nitrogen oxides (NOx) and sulfur oxides (SOx) were raised through the 1997 Protocol of Prevention of Marine Pollution from Ships (MARPOL) and in 2005 after a long period of eight years. In May, it met the entry into force requirements and is now implementing mandatory regulations.

Therefore, various methods for reducing NOx emissions have been introduced to satisfy these regulations, among which high pressure natural gas injection engines for marine structures such as LNG carriers, for example MEGI engines. Has been developed and used. MEGI engines are in the spotlight as next generation eco-friendly engines that can reduce pollutant emissions by 23%, carbon dioxide, 80% and sulfur compounds by more than 95%.

Such a MEGI engine may be installed on a vessel such as an LNG carrier or various plants such as an LNG carrier that stores and transports LNG in a cryogenic storage tank. In this case, natural gas is used as a fuel of the engine, and the load This requires a high pressure fuel gas supply pressure of about 150 to 400 bara (absolute pressure) for the engine.

The MEGI engine can also be used directly on the propellers for propulsion, for which the MEGI engine consists of a two-stroke engine rotating at low speed. That is, the MEGI engine is a low speed two-stroke high pressure natural gas injection engine.

The fuel supplied from the fuel tank (not shown) through the fuel transfer line L1 is supplied to the low pressure engine 20 through the low pressure gas supply line L2, and the high pressure engine 30 through the high pressure gas supply line L3. The entire fuel gas supply device can be configured to be supplied to

When using LNG as a fuel, the liquid LNG is heated and phase-changed to a gaseous state and then supplied to the engine. For this purpose, a low pressure gas is supplied to a low pressure gas supply line L2 that supplies fuel gas to the low pressure engine 20. The system 21 is installed, and the high pressure gas supply system 31 is installed in the high pressure gas supply line L3 for supplying fuel gas to the high pressure engine 30.

The low pressure gas supply system 21 includes a low pressure vaporizer 22 and the like, and the high pressure gas supply system 31 includes a high pressure pump 32 and a high pressure vaporizer 36 and the like. A transfer pump (not shown) is installed inside or outside the fuel tank to transfer LNG stored in the fuel tank. The pressure of the fuel gas required by the low pressure engine 20 is about the pressure compressed by the transfer pump, so that the low pressure gas It may not be necessary to install additional pumps in the supply system 21. However, since the pressure of the fuel gas required by the high pressure engine 30 is greater than the pressure compressed by the transfer pump, a high pressure for compressing the fuel compressed by the transfer pump to a higher pressure (about 150 to 400 bara) The pump 32 needs to be additionally installed in the high pressure gas supply system 31.

The high pressure pump 32 includes a pumping unit 33 for pressurizing and discharging the inhaled LNG, a driving unit 34 (for example, a motor) for driving the pumping unit 33, a pumping unit 33, and a driving unit. It may include a connecting shaft 35 for connecting power between the 34 to transmit power. Devices such as high pressure pump 32 and various pumps and compressors have a seal structure, but there is a possibility of LNG leaking through them.

When LNG leaks from the pump, there is a risk of explosion or fire. Therefore, the space in which the high pressure pump 32 is installed (that is, the first space 1) is divided into a hazardous area, and together with the high pressure pump 32, the first space ( Equipment placed in 1) must use strict explosion-proof products. As shown in FIG. 1, when both the low pressure gas supply system 21 and the high pressure gas supply system 31 are disposed in the first space 1 together with the high pressure pump 32, the low pressure gas supply system 21. As equipment such as the low-pressure vaporizer 22 included in the high pressure vaporizer 36 included in the high-pressure gas supply system 31 included in the explosion-proof products should be used, the price of the equipment is a factor that increases.

According to an aspect of the present invention for achieving the above object, a fuel gas supply device for supplying fuel gas to the engine installed in the ship, the gas supply system is installed in the gas supply line for supplying fuel gas to the engine; A pump and a vaporizer included in the gas supply system; A partition wall dividing a space in which the gas supply system is installed into a first space and a second space; It includes, wherein the pump is provided with a fuel gas supply device is installed at least a portion in the first space.

The pump and the vaporizer may be installed together in the first space.

Alternatively, the vaporizer may be installed in the second space.

The pump may include a pumping unit configured to pressurize and discharge the sucked fuel, a driving unit driving the pumping unit, and a connecting shaft connecting the pumping unit and the driving unit to transfer power.

The pumping part may be installed in the first space, and the driving part may be installed in the second space.

The connecting shaft may connect between the pumping part and the driving part through a bearing installed in the partition wall.

In this case, the vaporizer may be installed in the second space together with the driving unit.

The engine may include a low pressure engine requiring a relatively low fuel supply pressure and a high pressure engine requiring a relatively high fuel supply pressure. The gas supply line may include a low pressure gas supply line for supplying fuel gas to the low pressure engine and a high pressure gas supply line for supplying fuel gas to the high pressure engine. The gas supply system may include a low pressure gas supply system installed in the low pressure gas supply line and a high pressure gas supply system installed in the high pressure gas supply line. The pump may be a high pressure pump included in the high pressure gas supply system to pressurize the fuel to the fuel supply pressure required by the high pressure engine. The vaporizer may include a low pressure vaporizer included in the low pressure gas supply system and a high pressure vaporizer included in the high pressure gas supply system.

The low pressure vaporizer of the low pressure gas supply system may be installed in the second space, and the high pressure pump and the high pressure vaporizer of the high pressure gas supply system may be installed in the first space.

The low pressure vaporizer of the low pressure gas supply system and the high pressure vaporizer of the high pressure gas supply system may be installed in the second space, and the high pressure pump of the high pressure gas supply system may be installed in the first space.

The low pressure vaporizer of the low pressure gas supply system, the high pressure vaporizer of the high pressure gas supply system, and the drive unit of the high pressure pump of the high pressure gas supply system are installed in the second space, and the The pumping part of the high pressure pump may be installed in the first space.

According to the present invention, a fuel gas supply device may be provided in which a pump, which is likely to leak fuel gas, is installed in a separate space partitioned through a partition wall when transferring fuel gas such as LNG in a vessel.

Accordingly, according to the fuel gas supply device of the present invention, it is possible to safely transport the fuel gas without the risk of explosion or fire.

In addition, by placing the pump in a separate space, even if the fuel gas leaks through the sealing portion of the pump, it is possible not to affect other devices installed in the vessel for supplying the fuel gas, so that the pump and other space The devices installed in the system can use products with low explosion-proof rating.

1 is a view for explaining a fuel gas supply apparatus in a vessel equipped with a high pressure engine and a low pressure engine,

2 is a view for explaining a fuel gas supply apparatus according to a first embodiment of the present invention;

3 is a view for explaining a fuel gas supply apparatus according to a second embodiment of the present invention, and

4 is a view for explaining a fuel gas supply apparatus according to a third embodiment of the present invention.

Hereinafter, the configuration and operation of the embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4. In addition, the following examples may be modified in many different forms, and the scope of the present invention is not limited to the following examples.

FIG. 2 is a view for explaining a fuel gas supply apparatus according to a first embodiment of the present invention installed in a vessel equipped with a high pressure engine and a low pressure engine.

In the ship, a plurality of engines may be installed as needed, and usually one or more high pressure engines 30 (for example, MEGI engines) installed for propulsion, and one or more low pressure engines 20 installed for power generation ( For example a DF engine). The pressure of the fuel gas required by the high pressure engine 30 is greater than the pressure of the fuel gas required by the low pressure engine 20.

In the present specification, a vessel is a concept including all vessels such as various liquefied gas carriers such as LNG carriers, LNG RVs, container ships, and even plants such as LNG FPSO, Oil FPSO, LNG FSRU, and BMPP.

In addition, in the present specification, the fuel gas is not only stored in the fuel tank to be supplied as fuel to various engines mounted on the ship for propulsion, power generation, etc., but also stored in the storage tank for transportation as cargo. This concept includes the case of supplying the engine to the city.

According to the fuel gas supply apparatus of this embodiment, the fuel supplied from the fuel tank (not shown) through the fuel transfer line L1 is supplied to the low pressure engine 20 through the low pressure gas supply line L2, and the high pressure gas is supplied. It is supplied to the high pressure engine 30 through the line L3.

The low pressure gas supply system 21 is installed in the low pressure gas supply line L2 for supplying fuel gas to the low pressure engine 20, and the high pressure is supplied in the high pressure gas supply line L3 for supplying fuel gas to the high pressure engine 30. The gas supply system 31 is installed.

The low pressure gas supply system 21 includes a low pressure vaporizer 22 and the like, and the high pressure gas supply system 31 includes a high pressure pump 32 and a high pressure vaporizer 36 and the like. As the equipment included in the low pressure gas supply system 21 in addition to the low pressure vaporizer 22, for example, various devices involved in the fuel gas supply to the low pressure engine, a unit for controlling the devices, and the like can be mentioned. In addition, as the equipment included in the high pressure gas supply system 31 in addition to the high pressure pump 32 and the high pressure vaporizer 36, for example, various devices involved in the fuel gas supply to the high pressure engine and those devices are controlled. A unit etc. are mentioned.

A transfer pump (not shown) is installed inside or outside the fuel tank to transfer LNG stored in the fuel tank. The pressure of the fuel gas required by the low pressure engine 20 is about the pressure compressed by the transfer pump, so that the low pressure gas It may not be necessary to install additional pumps in the supply system 21. However, since the pressure of the fuel gas required by the high pressure engine 30 is greater than the pressure compressed by the transfer pump, a high pressure for compressing the fuel compressed by the transfer pump to a higher pressure (about 150 to 400 bara) The pump 32 needs to be additionally installed in the high pressure gas supply system 31.

The LNG heated in the high-pressure vaporizer 36 after being compressed to high pressure by the high-pressure pump 32 becomes a supercritical state and cannot be classified into gas or liquid. Thus, the term "vaporization" of the high pressure vaporizer 36 should be considered to mean heating the LNG to the temperature required by the high pressure engine.

The high pressure pump 32 in which a reciprocating pump is generally employed includes a pumping unit 33 for pressurizing and discharging the sucked LNG, and a driving unit 34 (for example, a motor) for driving the pumping unit 33. The connection shaft 35 may include a connecting shaft 35 connecting power between the pumping unit 33 and the driving unit 34 to transmit power.

When LNG leaks from the pump, there is a risk of explosion or fire. Therefore, the space in which the high pressure pump 32 is installed (that is, the first space 1) is divided into a hazardous area, and together with the high pressure pump 32, the first space ( Equipment placed in 1) must use strict explosion-proof products.

According to the first embodiment of the present invention shown in FIG. 2, the low pressure gas supply system 21 is separate from the high pressure gas supply system 31 including the high pressure pump 32 and the partition 3. It is provided in space, ie, 2nd space 2. Since the equipment such as the low pressure vaporizer 22 included in the low pressure gas supply system 21 is installed in a separate space from the high pressure pump 32, it is not necessary to apply an enhanced explosion-proof rating, thereby reducing the cost required to manufacture the equipment. You can save. However, the equipment included in the high pressure gas supply system 31, which is installed in the first space 1 together with the high pressure pump 32, should be manufactured by applying the reinforced explosion-proof rating.

3 is a view for explaining a fuel gas supply apparatus according to a second embodiment of the present invention installed in a vessel equipped with a high pressure engine and a low pressure engine.

In the following, in the fuel gas supply device according to the second embodiment, the differences from the first embodiment described above will mainly be described. In addition, the same components as in the first embodiment are given the same reference numerals, and detailed description thereof will be omitted.

The fuel gas supply apparatus according to the second embodiment includes a low pressure gas supply system 21 installed in a low pressure gas supply line L2 for supplying fuel gas to the low pressure engine 20 and including a low pressure vaporizer 22. Is installed in the high pressure gas supply line (L3) for supplying fuel gas to the high pressure engine 30, and includes a high pressure gas supply system 31 including a high pressure pump 32, a high pressure vaporizer 36, Here, the high-pressure pump 32 includes the pumping unit 33, the driving unit 34, and the connecting shaft 35, which is the same as the fuel gas supply apparatus according to the first embodiment.

However, according to the second embodiment, only the high pressure pump 32 among the equipment included in the high pressure gas supply system 31 is installed in the first space 1, and the low pressure gas supply system 21 and the high pressure gas supply are provided. Among the equipment included in the system 31, the equipment other than the high pressure pump 32, for example, the high pressure vaporizer 36, is a separate space separated by the partition 3 from the first space 1, that is, the second space. It is installed in the space 2. Equipment such as the low pressure vaporizer 22 included in the low pressure gas supply system 21 and equipment other than the high pressure pump 32 among the equipment included in the high pressure gas supply system 31, such as the high pressure vaporizer 36 and the like. Since the equipment is installed in a separate space from the high pressure pump 32, it is not necessary to apply the enhanced explosion-proof rating, thereby reducing the cost required for manufacturing the equipment.

4 is a view for explaining a fuel gas supply apparatus according to a third embodiment of the present invention installed in a vessel equipped with a high pressure engine and a low pressure engine.

In the following, in the fuel gas supply device according to the third embodiment, a different point from the above-described first embodiment will mainly be described. In addition, the same components as in the first embodiment are given the same reference numerals, and detailed description thereof will be omitted.

The fuel gas supply apparatus according to the third embodiment includes a low pressure gas supply system 21 installed in a low pressure gas supply line L2 for supplying fuel gas to the low pressure engine 20 and including a low pressure vaporizer 22. Is installed in the high pressure gas supply line (L3) for supplying fuel gas to the high pressure engine 30, and includes a high pressure gas supply system 31 including a high pressure pump 32, a high pressure vaporizer 36, Here, the high-pressure pump 32 includes the pumping unit 33, the driving unit 34, and the connecting shaft 35, which is the same as the fuel gas supply apparatus according to the first embodiment.

However, according to the third embodiment, only the pumping part 33 of the high pressure pump 32 among the equipment included in the high pressure gas supply system 31 is installed in the first space 1, and the low pressure gas supply system 21 is provided. Among the equipment included in the high pressure gas supply system 31, except for the pump 33 of the high pressure pump 32, for example, the high pressure vaporizer 36, the driving unit 34 of the high pressure pump 32, and the like. The first space 1 is provided in a separate space, which is divided by the partition 3, that is, the second space 2. Equipment other than the pumping unit 33 of the high pressure pump 32 among the equipment included in the low pressure gas supply system 21 and the low pressure vaporizer 22 included in the high pressure gas supply system 31, for example, high pressure The equipment such as the carburetor 36 and the driving unit 34 of the high pressure pump 32 is installed in a separate space from the pumping unit 33 of the high pressure pump 32, so that it is not necessary to apply the enhanced explosion-proof rating. The cost of manufacturing can be reduced.

Since the driving part 34 of the high pressure pump 32 is not a portion through which the LNG passes, no leakage of LNG occurs. Therefore, if only the pumping part 33 discharged after the LNG is sucked and pressurized among the high pressure pump 32 is installed in the danger zone, the driving part 34 of the high pressure pump 32 installed in a separate space by the partition 3. ) Does not need to apply an enhanced explosion-proof rating.

According to the third embodiment, a bearing 4 having a sealing function may be installed in the partition 3 so that the connecting shaft 35 connecting the pumping part 33 and the driving part 34 may pass therethrough.

According to the embodiments of the present invention, the high pressure pump 32, in particular, the pumping part 33 of the high pressure pump 32, in which the fuel gas leak may occur, is a first space as a danger zone separated by the partition wall 3. By installing in (1), even if the leakage of fuel gas occurs, the effect on the rest of the equipment can be minimized. Therefore, the remaining equipment that is not installed in the first space (1) can use a low explosion-proof product, it is possible to reduce the initial installation cost.

In addition, depending on the regulatory authority, the use of a driving means such as an electric motor is prohibited in the space where the pump is installed, regardless of the explosion-proof rating. When the fuel gas supply device is configured as in the third embodiment of the present invention, the high pressure pump Only the pumping part 33 of 32 is installed in the first space 1, and the driving part 34 of the high pressure pump 32, that is, the electric motor, is distinguished from the first space 1 by the partition 3. Since it is installed in the second space 2 to be made, it can be free from the above restrictions.

It will be apparent to those skilled in the art that the present invention is not limited to the above embodiments and can be practiced in various ways without departing from the technical spirit of the present invention. will be.

Claims

A fuel gas supply device for supplying fuel gas to an engine installed in a ship,

A gas supply system installed in a gas supply line for supplying fuel gas to the engine;

A pump and a vaporizer included in the gas supply system;

A partition wall dividing a space in which the gas supply system is installed into a first space and a second space;

Includes, wherein the pump is at least a portion of the fuel gas supply device is installed in the first space.
The method according to claim 1,

The pump and the vaporizer are installed in the first space fuel gas supply device.
The method according to claim 1,

The vaporizer is a fuel gas supply device is installed in the second space.
The method according to claim 1,

The pump includes a pumping part for pressurizing and discharging the sucked fuel, a driving part for driving the pumping part, and a connecting shaft connecting the pumping part and the driving part to transmit power.
The method according to claim 4,

The pumping unit is installed in the first space, the driving unit is a fuel gas supply device is installed in the second space.
The method according to claim 5,

The connecting shaft is a fuel gas supply device for connecting between the pumping unit and the drive through a bearing installed in the partition.
The method according to claim 5,

The gasifier is installed in the second space with the drive unit fuel gas supply device.
The method according to claim 1,

The engine includes a low pressure engine requiring a relatively low fuel supply pressure and a high pressure engine requiring a relatively high fuel supply pressure,

The gas supply line includes a low pressure gas supply line for supplying fuel gas to the low pressure engine and a high pressure gas supply line for supplying fuel gas to the high pressure engine.

The gas supply system includes a low pressure gas supply system installed in the low pressure gas supply line and a high pressure gas supply system installed in the high pressure gas supply line.

The pump is a high pressure pump included in the high pressure gas supply system to pressurize the fuel to the fuel supply pressure required by the high pressure engine,

The vaporizer includes a low pressure vaporizer included in the low pressure gas supply system and a high pressure gasifier included in the high pressure gas supply system.
The method according to claim 8,

The low pressure vaporizer of the low pressure gas supply system is installed in the second space,

The high pressure pump and the high pressure vaporizer of the high pressure gas supply system is installed in the first space.
The method according to claim 8,

The low pressure vaporizer of the low pressure gas supply system and the high pressure vaporizer of the high pressure gas supply system are installed in the second space,

The high pressure pump of the high pressure gas supply system is installed in the first space fuel gas supply device.
The method according to claim 8,

The high pressure pump includes a pumping unit for pressurizing and discharging the sucked fuel, a driving unit for driving the pumping unit, and a connecting shaft connecting the pumping unit and the driving unit to transfer power,

The low pressure vaporizer of the low pressure gas supply system, the high pressure vaporizer of the high pressure gas supply system, and the driving unit of the high pressure pump of the high pressure gas supply system are installed in the second space,

And the pumping part of the high pressure pump of the high pressure gas supply system is installed in the first space.