Process and apparatus for conditioning cryogenic fuel to establi

Refrigeration – Storage of solidified or liquified gas – Liquified gas transferred as liquid

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62 7, F17C 902

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active

055905358

ABSTRACT:
A method and apparatus for conditioning cryogenic fuel includes providing a primary storage tank for liquefied cryogenic fuel, a vapor storage tank communicating with the primary storage tank for storing vapor withdrawn from the primary storage tank at a higher pressure than the pressure in the primary storage tank, and a conditioning system wherein heat is transferred to the colder, lower equilibrium pressure liquefied cryogenic fuel withdrawn from the primary storage tank. The conditioning system includes a heat exchanger system for transferring heat to the liquefied cryogenic fuel from vapor withdrawn from the vapor storage tank. The vapor is cooled to near saturation temperature in the heat exchanger and is then sparged into liquefied cryogenic fuel flowing through a sparger or mixer chamber disposed downstream of the heat exchanger. A temperature sensor disposed in a conduit downstream of the sparger or mixer chamber measures the temperature (and thus the equilibrium pressure) of the warmed cryogenic fuel in the conduit. A temperature controller in communication with the temperature sensor regulates the flow rate of vapor from the vapor storage tank to the cryogenic fuel conditioning system in response to a signal from the temperature sensor.

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