SYSTEM AND METHOD FOR SUPPLYING FUEL

• US 20170217555A1
• Filed: 07/20/2015
• Published: 08/03/2017
• Est. Priority Date: 07/31/2014
• Status: Abandoned Application

• Current Assignee: Daewoo Shipbuilding & Marine Engineering Company Limited (Government of South Korea)
• Original Assignee: Daewoo Shipbuilding & Marine Engineering Company Limited (Government of South Korea)
• Inventors: KIM, Dong Chan
• Application Number:
  US15/500,886
• Publication Number:
  US 20170217555A1
• Time in Patent Office: Days
• CPC Class Codes: 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
• CPC Class Codes: F02D 19/08 simultaneously using pluralities of fuels F02D19/12 takes precedence
• CPC Class Codes: F02M 21/02 for gaseous fuels
• CPC Class Codes: F02M 21/0221 Fuel storage reservoirs, e.g. cryogenic tanks
• CPC Class Codes: F02M 21/023 Valves; Pressure or flow regulators in the fuel supply or return system
• 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: F02M 37/04 Feeding by means of driven pumps
• CPC Class Codes: F17C 3/10 by liquid-circulating or vapour-circulating jackets
• CPC Class Codes: F17C 7/02 Discharging liquefied gases
• 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

The present invention relates to a system and a method for supplying fuel and, more particularly, to a system and a method for supplying fuel, characterized in that LNG is pumped and supplied to a ship engine and, when the internal pressure of a pressure-resistant tank rises above the necessary pressure of the ship engine, the BOG is supplied to the ship engine, thereby controlling the internal pressure of the pressure-resistant tank, and an eductor is arranged at a point, at which lines that supply LNG and BOG join with each other, upstream of the ship engine such that the lines that supply LNG and BOG can be controlled simultaneously.

Claims

1. A fuel supply system, comprising:

a pressure-resistant tank for storing LNG provided to a ship or an offshore structure;

an LNG supply line for pumping the LNG from the pressure-resistant tank to a marine engine provided to the ship or the offshore structure;

a boil-off gas (BOG) vent line for supplying BOG generated from the pressure-resistant tank to the marine engine; and

an eductor disposed at a point at which the BOG vent line meets the LNG supply line upstream of the marine engine,

wherein, when an internal pressure of the pressure-resistant tank is higher than a required pressure of the marine engine, the BOG is supplied to the marine engine through the BOG vent line to control the internal pressure of the pressure-resistant tank.

2. The fuel supply system according to claim 1, wherein the LNG supply line is connected to a suction fluid connection of the eductor and the BOG vent line is connected to a motive fluid connection of the eductor.

3. The fuel supply system according to claim 2, wherein the LNG supply line is provided with a fuel supply pump for pumping LNG to increase pressure of the LNG to the required pressure of the marine engine and a shutoff valve for opening and closing the LNG supply line.

4. The fuel supply system according to claim 3, wherein the BOG vent line is provided with a pressure control valve for opening and closing the BOG vent line.

5. The fuel supply system according to claim 4, further comprising:

a heater disposed downstream of the eductor to heat the LNG or the BOG depending upon a required temperature of the marine engine.

6. The fuel supply system according to claim 1, wherein the marine engine comprises a dual fuel diesel generator (DFDG) supplied with a gas having a pressure of 3 bar to 15 bar.

7. The fuel supply system according to claim 1, wherein a design pressure of the pressure-resistant tank is set to be higher than an operating pressure of the marine engine and the pres sure-resistant tank comprises an independent IMO C-type tank.

8. A fuel supply method for a marine engine, comprising:

pumping LNG from a pressure-resistant tank to the marine engine,

wherein, when an internal pressure of the pressure-resistant tank is higher than a required pressure of the marine engine, BOG is supplied to the marine engine to control the internal pressure of the pressure-resistant tank, and

wherein an eductor is disposed at a point at which a BOG supply line meets an LNG supply line upstream of the marine engine to control the BOG supply line and the LNG supply line at the same time.

9. The fuel supply method according to claim 8, wherein the LNG supply line from the pressure-resistant tank is connected to a suction fluid connection of the eductor and the BOG supply line is connected to a motive fluid connection of the eductor.