Method for processing LNG for Rankine cycle

Details Method for processing LNG for Rankine cycle Method for processing LNG for Rankine cycle

1981-01-27

1983-06-14

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 28, 62 40, F25J 300

Patent

active

043880924

ABSTRACT:
A method is disclosed for processing LNG using a mixed heat medium for performing a Rankine cycle to gasify the LNG. The medium is prepared by batch distillation using only LNG. The method comprises the steps of condensing an upflow vapor in a single distillation column employing part of the LNG in an LNG batch distillation cycle, venting one fraction having low boiling point components mainly containing methane, and accumulating the other fractions containing ethane and components heavier than ethane. The supply of LNG to be distilled in the column is halted. A total condensing operation is performed in which the other fractions are sequentially condensed by part of the LNG at the condenser to sequentially recover and mix each component with the other fractions. LNG is added as the methane component to the recovered mixture of components to prepare a mixed heat medium consisting of components selected from hydrocarbons having 1-6 carbon atoms, or hydrocarbons having 1-6 carbon atoms and nitrogen. The mixed heat medium is stored. A mixed heat medium vapor generated by heat input to the stored mixed heat medium is condensed by LNG and returned to the mixed heat medium; collection and complete gasification of the low boiling point components mainly containing methane and the LNG is gasified by condensation to provide an LNG vapor gas. LNG is gasified by performing the Rankine cycle with the mixed heat medium.

REFERENCES:
patent: 3218816 (1965-11-01), Grenier
patent: 3479832 (1969-11-25), Sarsten et al.
patent: 3846993 (1974-11-01), Bates
patent: 4251249 (1981-02-01), Gulsby

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