WO2016163666A1

WO2016163666A1 - Fuel gas supply system

Info

Publication number: WO2016163666A1
Application number: PCT/KR2016/002863
Authority: WO
Inventors: 이원두; 강호숙; 이종철; 이효은; 황예림
Original assignee: 삼성중공업 주식회사
Priority date: 2015-04-07
Filing date: 2016-03-22
Publication date: 2016-10-13
Also published as: KR20160120373A

Abstract

Disclosed is a fuel gas supply system. The fuel gas supply system according to an embodiment of the present invention comprises: a storage tank for storing liquefied gas and boil-off gas of the liquefied gas; a compression unit for compressing the boil-off gas supplied from the storage tank; a first pump for pressurizing the liquefied gas supplied from the storage tank; a vaporizer for vaporizing the pressurized liquefied gas; a first supply line for supplying to an engine the boil-off gas, stored in the storage tank, via the compression unit; a second supply line for joining the boil-off gas, stored in the storage tank, at the rear end of the compression unit of the first supply line, via the first pump and the vaporizer; a measurement unit for measuring the pressure or amount of the boil-off gas supplied to the engine; and a control unit for controlling the first pump and the vaporizer on the basis of the measured value, and supplying the liquefied gas through the second supply line.

Description

Fuel gas supply system

The present invention relates to a fuel gas supply system.

With the tightening of the International Maritime Organization (IMO) regulations on the emission of greenhouse gases and various air pollutants, the shipbuilding and shipping industries use natural gas, a clean energy source, instead of using heavy fuel oil and diesel oil. In many cases it is used.

Natural gas, which is widely used among fuel gases, contains methane as a main component, and is generally changed to a liquefied gas in which the volume is reduced to 1/600 and stored and transported.

The liquefied gas carrier has an insulated storage tank for storing liquefied gas. The engine of such a vessel uses the liquefied gas of the storage tank forcibly used as fuel, or the boiled off gas naturally generated in the storage tank as a fuel. Of course, such a liquefied gas carrier employs an engine capable of using heterogeneous fuels, so that the liquefied gas carrier can have a storage tank for separately storing fuel gas or fuel oil instead of transportation cargo.

On the other hand, when there is a lot of liquefied gas contained in the storage tank because there is a lot of boil-off gas naturally occurring in the storage tank is not unreasonable to use this as the fuel of the engine. However, when the amount of liquefied gas contained in the storage tank is small, the amount of naturally occurring boil-off gas is too small to use it as a fuel of the engine. Furthermore, when the load of the engine increases and the fuel supply required increases, it is necessary to adjust the proper flow rate required by the engine. As a related art, refer to Korean Patent Publication No. 10-2012-0103421 (published on September 19, 2012).

An embodiment of the present invention is to provide a fuel gas supply system that can be efficiently supplied to the flow rate according to the fuel supply amount required by the engine.

According to an aspect of the invention, the storage tank for storing the liquefied gas and the boil-off gas of the liquefied gas; Compression unit for compressing the boil-off gas supplied from the storage tank; A first pump pressurizing the liquefied gas supplied from the storage tank; A vaporizer for vaporizing the pressurized liquefied gas; A first supply line supplying the boil-off gas stored in the storage tank to the engine via the compression unit; A second supply line for joining the liquefied gas stored in the storage tank to the rear end of the compression unit of the first supply line through the first pump and the vaporizer; A measuring unit measuring the pressure or amount of the boil-off gas supplied to the engine; And a controller configured to control the first pump and the vaporizer to supply the liquefied gas through the second supply line based on the measured value.

The measuring unit is provided between the compression unit and the rear end of the compression unit of the first supply line, the pressure measuring unit for measuring the pressure of the boil-off gas supplied to the engine, and the compression unit front or rear end of the first supply line Installed in, it may include a flow rate measuring unit for measuring the amount of boil-off gas supplied to the engine.

The compression unit may include a plurality of compressors and coolers disposed alternately with the compressors, and the compressor and the high pressure pump may operate in a reciprocating manner.

The apparatus may further include a buffer tank installed between the rear end of the compression unit of the first supply line and the engine engine.

Fuel gas supply system according to an embodiment of the present invention can be efficiently supplied to the flow rate according to the fuel supply amount required by the engine.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 shows a fuel gas supply system according to an embodiment of the present invention.

2 shows a fuel gas supply system according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as an example to sufficiently convey the spirit of the present invention to those skilled in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. Parts not related to the description are omitted in the drawings in order to clearly describe the present invention, in the drawings, the width, length, thickness, etc. of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.

Referring to FIG. 1, the fuel gas supply system 100 according to an embodiment of the present invention may effectively replenish a fuel supply amount required by an engine. The fuel gas supply system 100 includes various liquefied fuel carriers, liquefied fuel RVs (Regasification Vessels), container ships, commercial vessels, LNG FPSOs (Floating, Production, Storage and Off-loading), and LNG Floating Storage and Regasification Units (FSRU). It can be applied to a ship including the like.

The fuel gas supply system 100 is a storage tank 10 for storing the liquefied gas and the boil-off gas of the liquefied gas, a compression unit 20 for compressing the boil-off gas supplied from the storage tank 10, the storage tank 10 The high pressure pump 30 for pressurizing and sending the liquefied gas supplied from the high pressure gas, the high pressure vaporizer 40 for vaporizing the liquefied gas passed through the high pressure pump 30, and the compressed gas 20 supplied from the storage tank 10. Compressed portion of the first supply line (L1) through the high pressure pump 30 and the high pressure vaporizer 40 to the liquefied gas supplied from the first supply line (L1), the storage tank 10 through the (20) It is installed between the second supply line (L2) to be joined to the rear end, the rear end of the compression unit 20 of the first supply line (L1) and the engine (E), the compression unit through the first supply line (L1) Measurement unit for measuring at least one of the pressure and the amount of the boil-off gas supplied to the engine (E) via (20), the value and the preset value measured by the measurement unit Based on the result of the comparison, the high pressure pump 30 and the high pressure vaporizer 40 are operated to supply the liquefied gas through the second supply line L2 to supply the fuel required by the engine E. And a control unit 60 for replenishing the supply amount. 1 and 2, the measuring unit may be implemented as a pressure measuring unit 50 and the flow rate measuring unit 55.

As shown in FIG. 1, the liquefied gas stored in the above-described storage tank 10 includes LNG (Liquefied Natural Gas), LPG (Liquefied Petroleum Gas), DME (Dimethylether), and Ethane, which can be stored in a liquefied state. It may be any one but is not limited thereto. The storage tank 10 may include a membrane-type tank, an SPB-type tank, or the like, which stores fuel in a liquefied state while maintaining a heat insulation state. When the liquefied gas is LNG, the storage tank 10 may maintain an internal pressure of 1 bar or higher pressure in consideration of fuel supply conditions, and maintain an internal temperature of about −163 ° C. to maintain a liquefied state.

The boil-off gas of the liquefied gas stored in the storage tank 10 is supplied toward the engine E through the first supply line L1. Here, the engine E may be a high pressure gas injection engine such as a ME-GI engine.

The compression unit 20 includes a plurality of compressors 22 and coolers 24 alternately arranged with the compressors 22, and are supplied from the storage tank 10 to match the fuel gas supply conditions of the engine E. Compress the evaporated gas of the liquefied gas.

At this time, when the branch line (D1) is branched in the intermediate compression step of the compression unit 20, the amount of boil-off gas of the liquefied gas supplied from the storage tank 10 is larger than the fuel supply amount required by the engine (E) In addition, a part of the boil-off gas may be supplied to the demand source 90 through the branch line D1. The customer 90 may include, for example, a low pressure gas injection engine such as a DFDE engine, a turbine, or the like.

The pressure measuring unit 50 is installed between the rear end of the compression unit 20 of the first supply line L1 and the engine E, and the boil-off gas of the liquefied gas supplied to the engine E via the compression unit 20. Measure the pressure. In FIG. 1, the pressure measuring unit 50 is installed between the confluence point C and the engine E. However, in another example, the pressure measuring unit 50 may be installed between the rear end of the compression unit 20 and the confluence point C.

As the load of the engine E increases, the required fuel supply amount increases. At this time, when the engine E draws a lot of the boil-off gas supplied through the first supply line L1, the amount of the boil-off gas supplied to the engine E by using the amount larger than the maximum flow rate of the compression unit 20 is used. The pressure is measured low by the pressure measuring unit 50.

When the pressure of the boil-off gas measured by the pressure measuring unit 50 is lower than the set pressure (set value), the controller 60 supplies a flow rate at which the fuel supply amount required by the engine E is actually supplied to the engine E. I think more. In this case, the controller 60 opens the valve V1 installed in the second supply line L2 and operates the delivery pump 12 in the storage tank 10 to remove the liquefied gas stored in the storage tank 10. 2 is supplied to the high pressure pump 30 through the supply line L2, and the high pressure pump 30 and the high pressure vaporizer 40 are operated to supply vaporized liquefied gas to supplement the fuel supply amount required by the engine E. You can.

Here, the high pressure pump 30 receives the liquefied gas from the storage tank 10 and raises it to 150 to 300 bar, which is the fuel gas supply pressure of the engine E, and sends it to the high pressure vaporizer 40. At this time, as described above, the delivery pump 12 is installed in the storage tank 10, and the high pressure pump 30 supplies the liquefied gas stored in the storage tank 10 through the second supply line L2 according to a preset pressure. Can be sent out. The high pressure vaporizer 40 vaporizes the liquefied gas of the high pressure passed through the high pressure pump 30 and sends it to the confluence point C with the first supply line L1 through the second supply line L2. The vaporized liquefied gas supplied through the second supply line (L2) is mixed with the boil-off gas supplied through the first supply line (L1) and supplied to the engine (E). This can effectively replenish the fuel supply required by the engine (E).

On the other hand, the compressor 22 and the high pressure pump 30 included in the above-described compression unit 20 may be a reciprocating pump, and repeat the pressure reduction, suction, pressurization, discharge process. In this process, the pressure of the discharge part rises and falls repeatedly, and since the fluid does not continuously flow out, the flow rate continuously changes.

Therefore, the buffer tank 70 may be provided at the front end of the engine E to reduce the flow rate change of the fluid supplied to the engine E. In FIG. 1 and FIG. 2, the buffer tank 70 is shown between the confluence point C of the first supply line L1 and the engine E, but the engine E is provided through the first supply line L1. If it is possible to suppress the flow rate of the vaporized liquefied gas supplied to the engine E through the boil-off gas and / or the second supply line (L2) is provided in various locations. In addition, the buffer tank 70 may be provided with a manifold (Manifold, not shown), the manifold may divide the fuel gas supplied from the buffer tank 70 may be supplied to the chamber of each cylinder of the engine (E). .

Hereinafter, a fuel gas supply system 100 according to another exemplary embodiment of the present invention will be described with reference to FIG. 2, and a description overlapping with that of FIG. 1 will be omitted.

Referring to FIG. 2, the flow rate measuring unit 55 may be installed at one or more of the front and rear ends of the compression unit 20 of the first supply line L1. The flow rate measuring unit 55 may be used to measure the amount of boil-off gas supplied from the storage tank 10 through the first supply line L1. For reference, in FIG. 2, the flow rate measuring unit 55 is installed between the rear end of the compression unit 20 and the confluence point C as an example, but is disposed between the confluence point C and the engine E in another example. May be

The controller 60 measures the flow rate measured by the flow rate measuring unit 55 based on a result of comparing the flow rate measured by the flow rate measuring unit 55 with the fuel supply amount (set value) required by the engine E. When the amount of boil-off gas is less than the fuel supply required by the engine E, the liquefied gas vaporized through the second supply line L2 by operating the high pressure pump 30 and the high pressure vaporizer 40 as described above. By supplying the fuel can be supplemented with the fuel supply required by the engine (E).

The pressure measuring unit 50 and the flow measuring unit 55 may perform wired or wireless communication with the control unit 60, and various control data, measured values, set values, and the like may be transmitted and received.

In the above, specific embodiments have been illustrated and described. However, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains can variously change variously without departing from the gist of the technical idea of the invention described in the claims below. Could be.

Claims

A storage tank for storing liquefied gas and evaporated gas of the liquefied gas;

Compression unit for compressing the boil-off gas supplied from the storage tank;

A first pump pressurizing the liquefied gas supplied from the storage tank;

A vaporizer for vaporizing the pressurized liquefied gas;

A first supply line supplying the boil-off gas stored in the storage tank to the engine via the compression unit;

A second supply line for joining the liquefied gas stored in the storage tank to the rear end of the compression unit of the first supply line through the first pump and the vaporizer;

A measuring unit measuring the pressure or amount of the boil-off gas supplied to the engine; And

And a controller configured to control the first pump and the vaporizer to supply the liquefied gas through the second supply line based on the measured value.
The method of claim 1,

The measuring unit is installed between the compression end of the first supply line and the engine, the pressure measuring unit for measuring the pressure of the boil-off gas supplied to the engine;

And a flow rate measuring unit installed at a front end or a rear end of the compression unit of the first supply line to measure an amount of the boil-off gas supplied to the engine.
The method of claim 2,

And a heater installed in the fourth supply line and heating a gas component supplied from the gas-liquid separator according to temperature conditions required by the second engine.
The method of claim 3,

The fuel gas supply system further comprises a buffer tank installed between the rear end of the compression section of the first supply line and the engine.