# US 2018/0320637 A1 · Gas processing system and vessel including the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2018/0320637 A1
- Document ID: US20180320637A1
- Status: Published application
- Kind: A1
- Application number: 15/772,705
- Filed: 2016-07-07
- Published: 2018-11-08
- Earliest claimed: 2015-11-05
- Assignees: Hyundai Heavy Industries Co., Ltd.
- Applicants: Hyundai Heavy Industries Co., Ltd.
- Inventors: Sang Bong LEE; Dong Jin LEE
- Web page: https://patentgrep.com/patent/US20180320637A1

## CPC

- F02M 25/089: {Layout of the fuel vapour installation}
- B63B 25/12: closed
- B63B 25/16: heat-insulated (insulating panelling B63B3/68; heating or cooling B63J)
- B63H 21/38: Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like ({in outboard drives B63H20/001; } lubricating or cooling machines or engines in general F01 - F04)
- F02D 19/022: {to adjust the fuel pressure, temperature or composition}
- F02M 21/0209: {Hydrocarbon fuels, e.g. methane or acetylene}
- F02M 21/0215: {Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas}
- F02M 21/0218: {Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers}
- F02M 21/0245: {High pressure fuel supply systems; Rails; Pumps; Arrangement of valves}
- F02M 21/0287: {characterised by the transition from liquid to gaseous phase (F02M21/06 takes precedence); Injection in liquid phase; Cooling and low temperature storage}
- F02M 21/06: Apparatus for de-liquefying, e.g. by heating
- F17C 9/02: with change of state, e.g. vaporisation
- F25J 1/0025: {Boil-off gases "BOG" from storages}
- F25J 1/004: {by flash gas recovery (F25J1/0267 takes precedence)}
- F25J 1/005: {by expansion of a gaseous refrigerant stream with extraction of work}
- F25J 1/0072: {Nitrogen}
- F25J 1/0201: {using only internal refrigeration means, i.e. without external refrigeration}
- F25J 1/0202: {in a quasi-closed internal refrigeration loop (F25J1/0208, F25J1/0219, F25J1/0224 take precedence)}
- F25J 1/0204: {as a single flow SCR cycle}
- F25J 1/023: {for the combustion as fuels, i.e. integration with the fuel gas system}
- F25J 1/0245: {Different modes, i.e. 'runs', of operation; Process control}
- F25J 1/0277: {Offshore use, e.g. during shipping}
- B63J 2099/003: {of cargo oil or fuel, or of boil-off gases, e.g. for propulsive purposes}
- F02M 25/08: adding fuel vapours drawn from engine fuel reservoir {(electrical control of purge system F02D41/003)}
- F17C 2221/035: Propane butane, e.g. LPG, GPL
- F17C 2223/0161: cryogenic, e.g. LNG, GNL, PLNG
- F17C 2227/0157: Compressors
- F17C 2265/066: for feeding engines for propulsion
- F17C 2270/0105: Ships
- F25J 2215/62: Ethane or ethylene
- F25J 2215/64: Propane or propylene
- F25J 2230/08: Cold compressor, i.e. suction of the gas at cryogenic temperature and generally without afterstage-cooler
- F25J 2230/24: Multiple compressors or compressor stages in parallel
- F25J 2230/30: Compression of the feed stream
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- Y02T 70/50: Measures to reduce greenhouse gas emissions related to the propulsion system
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06)
- B63H: MARINE PROPULSION OR STEERING (propulsion of air-cushion vehicles B60V1/14; specially adapted for submarines, other than nuclear propulsion, B63G; specially adapted for torpedoes F42B19/00)
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25)
- F25J: LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS {OR LIQUEFIED GASEOUS} MIXTURES BY PRESSURE AND COLD TREATMENT {OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE (cryogenic pumps F04B37/08; gas storage vessels, gas holders F17; filing vessels with, or discharging from vessels, compressed, liquefied or solidified gases F17C; refrigeration machines, plants, or systems F25B)}
- B63J: AUXILIARIES ON VESSELS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A gas processing system according to an embodiment of the present invention controls inflow fuel pressure of a low pressure demand source according to an operation or a non-operation of a high pressure demand source and the low pressure demand source.

## Claims

### Claim 1

A gas processing system, comprising:
a first demand source which consumes fuel of first pressure;
a second demand source which consumes fuel of second pressure that is lower than the first pressure;
a Boil Off Gas (BOG) compressor which compresses BOG generated in a liquefied gas storage tank; and
a controller which determines whether the first demand source operates, and control inflow fuel pressure of the second demand source.

### Claim 2 (depends on 1)

The gas processing system of claim 1, wherein the controller determines a demand source, to which the BOG compressed by the BOG compressor is to be supplied, between the first demand source and the second demand source, and performs variable frequency drive control on the BOG compressor so that the BOG compressor discharges the BOG with the first pressure or the second pressure.

### Claim 3 (depends on 2)

The gas processing system of claim 2, further comprising:
a first supply line which connects the liquefied gas storage tank and the first demand source and is provided with the BOG compressor; and
a second supply line which is branched in a downstream side of the BOG compressor on the first supply line to be connected with the second demand source, and is not provided with a separate decompressing means,
wherein when the first demand source is erroneously operated or an operation of the first demand source is stopped, the controller performs the variable frequency drive control on the BOG compressor so as to discharge the BOG with the second pressure.

### Claim 4 (depends on 1)

The gas processing system of claim 1, further comprising:
a first line which connects the liquefied gas storage tank and the first demand source and the second demand source, and is provided with the BOG compressor; and
a second line which connects a rear end and a front end of the BOG compressor,
wherein the controller determines a demand source, to which the BOG compressed by the BOG compressor is to be supplied, between the first demand source and the second demand source, and controls a flow of liquefied gas or the BOG flowing in the first line or the second line.

### Claim 5 (depends on 4)

The gas processing system of claim 4, wherein when the first demand source is erroneously operated or an operation of the first demand source is stopped, the controller controls at least a part of the BOG discharged from the BOG compressor to flow in the second line to make that pressure of the BOG discharged from the BOG compressor become the second pressure.

### Claim 6 (depends on 5)

The gas processing system of claim 5, wherein the first line includes:
a first BOG supply line which connects the liquefied gas storage tank and the first demand source and is provided with the BOG compressor; and
a second BOG supply line which is branched in the downstream side of the BOG compressor on the BOG supply line to be connected with the second demand source, and is not provided with a separate decompressing means, and
when the first demand source is erroneously operated or an operation of the first demand source is stopped, the controller controls the remaining portion of the BOG discharged from the BOG compressor to be supplied to the second BOG supply line.

### Claim 7 (depends on 1)

The gas processing system of claim 1, further comprising:
a flow amount control unit which is provided in an upstream side of the BOG compressor and controls a flow amount of the BOG flowing into the BOG compressor,
wherein the controller determines a demand source, to which the BOG compressed by the BOG compressor is to be supplied, between the first demand source and the second demand source, and controls the flow amount control unit so that the BOG compressor discharges the BOG with the first pressure or the second pressure.

### Claim 8 (depends on 7)

The gas processing system of claim 7, wherein when the first demand source is erroneously operated or an operation of the first demand source is stopped, the controller controls the BOG compressor to discharge the BOG with the second pressure by operating the flow amount control unit so that the flow amount of the BOG flowing into the BOG compressor is decreased.

### Claim 9 (depends on 8)

The gas processing system of claim 8, further comprising:
an adjusting valve which is provided in the downstream side of the BOG compressor,
wherein when the first demand source is erroneously operated or an operation of the first demand source is stopped, the controller increases the degree of opening of the adjusting valve, operates the flow amount control unit, and enables the second demand source to receive the compressed BOG discharged from the BOG compressor which receives the decreased amount of BOG, and
when the first demand source is normally operated, the controller decreases the degree of opening of the adjusting valve, stops the operation of the flow amount control unit, and then enables the first demand source to receive the compressed BOG discharged from the BOG compressor.

### Claim 10 (depends on 1)

The gas processing system of claim 1, further comprising:
a first supply line which connects the liquefied gas storage tank and the first demand source and is provided with the BOG compressor;
a second supply line which is connected with the liquefied gas storage tank and a downstream side of the BOG compressor on the first supply line; and
a forcing vaporizer which is provided on the second supply line, and compulsorily vaporizes liquefied gas stored in the liquefied gas storage tank to generate Forced Boil Off Gas (FBOG),
wherein the BOG compressor has a capacity in which it is possible to process all of naturally generated BOG generated in the liquefied gas storage tank in a full load state as a maximum processing capacity.

### Claim 11 (depends on 1)

The gas processing system of claim 1, wherein the case where the operation of the first demand source is stopped is a case where a vessel is anchored at a dock.

### Claim 12 (depends on 1)

The gas processing system of claim 1, wherein the first demand source is a low-speed two-stroke low pressure injection engine.

### Claim 13 (depends on 1)

The gas processing system of claim 1, wherein the controller supplies the BOG compressed by the BOG compressor to the second demand source without a separate decompressing means.

### Claim 14 (depends on 1)

A vessel comprising the gas processing system of claim 1.