Systems for delivering liquified natural gas to an engine

Refrigeration – Utilizing fuel as refrigerant

Patent

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Details

62 482, 62 502, 62 504, F25B 1900

Patent

active

061256374

ABSTRACT:
A fuel delivery system includes a fuel tank configured to receive liquid natural gas. A first conduit extends from a vapor holding portion of the fuel tank to an economizer valve. A second conduit extends from a liquid holding portion of the fuel tank to the economizer valve. Fluid coupled to the economizer valve is a vaporizer which is heated by coolant from the engine and is positioned below the fuel tank. The economizer valve selectively withdraws either liquid natural gas or vaporized natural gas from the fuel tank depending on the pressure within the vapor holding portion of the fuel tank. A delivery conduit extends from the vaporizer to the engine. A return conduit having a check valve formed therein extends from the delivery conduit to the vapor holding portion of the fuel tank for pressurizing the fuel tank.

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Hibl, J. J., "Cyrogenic Fuel Systems for Motor Vehicles," Advances in Cryogenic Engineering, vol. 21, pp. 180-186.

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