SYSTEM FOR SUPPLYING LIQUEFIED NATURAL GAS FUEL

• US 20140250922A1
• Filed: 10/23/2013
• Published: 09/11/2014
• Est. Priority Date: 03/06/2013
• Status: Abandoned Application

• Current Assignee: Hyundai Heavy Industries Company Limited (Korea Shipbuilding & Offshore Engineering Co., Ltd.)
• Original Assignee: Hyundai Heavy Industries Company Limited (Korea Shipbuilding & Offshore Engineering Co., Ltd.)
• Inventors: HAN, Ju Seog, KANG, Min Ho, LEE, Jong Bum, HEO, Hee Seung
• Application Number:
  US14/060,821
• Publication Number:
  US 20140250922A1
• Time in Patent Office: Days
• US Class Current: 62/50.2
• CPC Class Codes: F02D 19/0647 the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
• CPC Class Codes: F02M 21/0215 Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
• CPC Class Codes: 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
• CPC Class Codes: F02M 21/06 Apparatus for de-liquefying, e.g. by heating
• CPC Class Codes: F17C 2201/0157 Polygonal
• CPC Class Codes: F17C 2201/052 large (>1000 m3)
• CPC Class Codes: F17C 2203/0604 Liners
• CPC Class Codes: F17C 2203/0629 Two walls
• CPC Class Codes: F17C 2203/0643 Stainless steels
• CPC Class Codes: F17C 2221/033 Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
• CPC Class Codes: F17C 2223/0115 dense or supercritical, i.e. at high pressure and high density
• CPC Class Codes: F17C 2223/0161 cryogenic, e.g. LNG, GNL, PLNG
• CPC Class Codes: F17C 2225/0115 dense or supercritical, i.e. at high pressure and high density
• CPC Class Codes: F17C 2225/0123 gaseous, e.g. CNG, GNC
• CPC Class Codes: F17C 2225/0169 subcooled
• CPC Class Codes: F17C 2225/036 Very high pressure, i.e. above 80 bars
• CPC Class Codes: F17C 2227/0135 Pumps
• CPC Class Codes: F17C 2227/0323 in a closed loop
• CPC Class Codes: F17C 2265/031 by discharge
• CPC Class Codes: F17C 2265/066 for feeding engines for propulsion
• CPC Class Codes: F17C 2270/0105 : Ships
• CPC Class Codes: F17C 7/04 : with change of state, e.g. vaporisation
• CPC Class Codes: Y02T 10/30 : Use of alternative fuels, e.g. biofuels

Abstract

A system for supplying LNG fuel is disclosed. The system includes a fuel supplying line connected from an LNG storage tank to a high pressure engine and a low pressure engine, respectively, a pump formed on the fuel supplying line, and configured to pressurize LNG outputted from the LNG storage tank to high pressure, a first heat exchanger formed on the fuel supplying line between the high pressure engine and the pump, and configured to heat the LNG supplied from the pump, a second heat exchanger formed on the fuel supplying line between the low pressure engine and the LNG storage tank, and configured to evaporate the LNG in a liquid state supplied from the LNG storage tank and a heat source supplying line configured to supply heat to the LNG by supplying glycol water to the first heat exchanger and the second heat exchanger.

Claims

1. A system for supplying LNG fuel, the system comprising:

a fuel supplying line connected from an LNG storage tank to a high pressure engine and a low pressure engine, respectively;

a pump provided on the fuel supplying line and configured to pressurize LNG outputted from the LNG storage tank to high pressure;

a first heat exchanger provided on the fuel supplying line between the high pressure engine and the pump and configured to heat the LNG supplied from the pump;

a second heat exchanger provided on the fuel supplying line between the low pressure engine and the LNG storage tank and configured to evaporate the LNG in a liquid state supplied from the LNG storage tank; and

a heat source supplying line configured to apply heat to the LNG by supplying glycol water to the first heat exchanger and the second heat exchanger.

2. The system of claim 1, wherein the LNG in a liquid state outputted from the LNG storage tank is evaporated by the second heat exchanger without heating forcibly the LNG using an extra heat source.

3. The system of claim 1, wherein the heat source supplying line comprises

a glycol heater configured to heat glycol water heat-exchanged with the LNG in the first heat exchanger or the second heat exchanger and supply the heated glycol water to the first heat exchanger or the second heat exchanger.

4. The system of claim 1, wherein the heat source supplying line supplies sequentially the glycol water to the first heat exchanger and the second heat exchanger, or supplies the glycol water to the second heat exchanger by making a detour around the first heat exchanger.

5. The system of claim 1, wherein the pump comprises:

a boosting pump configured to pressurize the LNG stored in the LNG storage tank or outputted from the LNG storage tank; and

a high pressure pump configured to pressurize the LNG outputted from the boosting pump to a pressure of 200 bar to 400 bar.

6. The system of claim 5, wherein the boosting pump pressurizes the LNG to a pressure of 1 bar to 25 bar.

7. The system of claim 5, wherein the fuel supplying line is branched from a rear part of the boosting pump, and is connected to the high pressure engine and the low pressure engine, respectively.

8. The system of claim 1, further comprising:

a decompression means provided on the fuel supplying line connected to the low pressure engine.

9. The system of claim 1, wherein the high pressure engine is a MEGI engine, and the low pressure engine is a dual fuel engine.

10. The system of claim 1, further comprising:

a methane number measuring sensor provided on the fuel supplying line and configured to sense a methane number of the LNG.

11. The system of claim 1, further comprising:

a gas mixing line configured to supply a boil off gas BOG generated from the LNG storage tank to the second heat exchanger.