Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1981-01-27
1984-04-24
Richter, Sheldon J.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
606411, 60651, 60655, 60671, F01K 2304, F01K 2506
Patent
active
044440154
ABSTRACT:
The present invention discloses a method for recovering effective energy as power between liquefied natural gas and a high temperature source by cascading two kinds of Rankine cycles when the liquefied natural gas is re-gasified. The method is characterized in that a first medium performs a first Rankine cycle with the liquefied natural gas as a low temperature source, the first medium being mainly a mixture of hydrocarbons having 1-6 carbon atoms or a mixture of halogenated hydrocarbons of boiling points close to those of said hydrocarbons, the first medium having compositions according to which the vapor curve of gasifying the liquefied natural gas substantially corresponds to the low pressure cooling curve of the first medium, the power generated thereby is recovered by a first turbine during the first Rankine cycle, a second medium having a higher boiling point than said first medium performs a second Rankine cycle with part of said first Rankine cycle as the low temperature source, the second medium, being a single hydrocarbon component having 1-6 carbon atoms or a mixture thereof, a single halogenated hydrocarbon whose boiling point is close to that of this hydrocarbon or a mixture thereof, or ammonia, whose low pressure cooling curve substantially corresponds to the vapor curve of the high pressure first medium, said first and second Rankine cycles are cascaded, and a second turbine is disposed to recover power during the second Rankine cycle.
REFERENCES:
patent: 3892103 (1975-07-01), Antonelli
patent: 4231226 (1980-11-01), Griepentrog
patent: 4242870 (1981-01-01), Searingen et al.
patent: 4400947 (1983-08-01), Ruhemann
46209 W., Chemical Abstracts, vol. 82, No. 8, Feb. 24, 1975.
Aoki Ichizo
Matsumoto Osamu
Chiyoda Chemical Engineering & Construction Co. Ltd.
Richter Sheldon J.
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