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AssigneeChicago Bridge & Iron Technical Services Company
InventorsRichard J. Kooy, John S. Andrepont, Roger F. Gyger, Lewis Tyree, Jr.
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LNG is pumped to high pressure, vaporized, further heated and then expanded to create rotary power that is used to generate electrical power. A reservoir of carbon dioxide at about its triple point is created in an insulated vessel to store energy in the form of refrigeration recovered from the evaporated LNG. During peak electrical power periods, liquid carbon dioxide is withdrawn therefrom, pumped to a high pressure, vaporized, further heated, and expanded to create rotary power which generates additional electrical power. The exhaust from a fuel-fired combustion turbine, connected to an electrical power generator, heats the high pressure carbon dioxide vapor. The discharge stream from the CO.sub.2 expander is cooled and at least partially returned to the vessel where vapor condenses by melting stored solid carbon dioxide. During off-peak periods, CO.sub.2 vapor is withdrawn from the reservoir and condensed to liquid by vaporizing LNG, so that use is always efficiently made of the available refrigeration from the vaporizing LNG, and valuable peak electrical power is available when needed by using the stored energy in the CO.sub.2 reservoir.
A method for generating power from LNG and storing energy , which method comprises
A method for generating power from LNG and storing energy and then using such stored energy to generate additional power, which method comprises the following steps, providing a source of LNG at a temperature of about -250.degree. F. or lower, increasing the pressure of said LNG to at least about 50 psia, vaporizing said increased pressure LNG to natural gas by passing it in heat exchange relationship with a working fluid vapor which is condensed, increasing the pressure of said liquefied working fluid, heating said increased pressure working fluid to vaporize it, expanding said heated working fluid vapor to create rotary power, creating a reservoir of carbon dioxide at about the triple point thereof, which reservoir contains a substantial percentage of solid carbon dioxide, withdrawing a stream of liquid carbon dioxide from said reservoir and very substantially increasing the pressure of said stream of withdrawn liquid, heating said increased pressure carbon dioxide stream above its critical temperature, expanding said heated carbon dioxide stream to dry vapor or to vapor containing some entrained liquid to create additional rotary power, and returning at least a portion of the expanded CO.sub.2 to said reservoir where carbon dioxide vapor is condensed by melting solid carbon dioxide therein and directing any remainder of said expanded CO.sub.2 vapor to said working fluid heating step where it is condensed.
A method for generating power from LNG and storing energy and then using such stored energy to generate additional power, which method comprises the following steps, providing a source of LNG at a temperature of about -250.degree. F. or lower, increasing the pressure of said LNG to between about 400 psia and about 900 psia, creating a reservoir of carbon dioxide at about the triple point thereof, which reservoir contains a substantial percentage of solid carbon dioxide, withdrawing a stream of liquid carbon dioxide from said reservoir and very substantially increasing the pressure of said stream of withdrawn liquid, heating said increased pressure carbon dioxide stream above its critical temperature, expanding said heated carbon dioxide stream to dry vapor or to vapor containing some entrained liquid, returning at least a portion of the expanded CO.sub.2 to said reservoir where carbon dioxide vapor is condensed by melting solid carbon dioxide therein, vaporizing said high pressure LNG to natural gas by condensing CO.sub.2 vapor, heating said high pressure natural gas, expanding said heated natural gas, and creating rotary power from said expansion steps.
A system for generating power from LNG and storing energy which is thereafter used to generate additional power, which system comprises
Dependencies are inferred from the claim text.