초록 ▼

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 evap

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 During peak electrical power periods, liquid carbon dioxide is withdrawn therefrom, pumped to a high pressure, vaporized, further heated, and expanded to create rotary power which generates additional electrical power.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 CO2 expander is cooled and at least partially returned to the vessel where vapor condenses by melting stored solid carbon dioxide. During off-peak periods, CO2 vapor is withdrawn from the reservoir and condensed to liquid by vaporizing LNG, so that use is always efficiently made of the available refrigeration from the vaporizing LNG,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 CO2 reservoir.

대표청구항 ▼

A method for generating power from LNG and storing energy , which method comprises providing a source of LNG at a temperature of about -250°F. or lower, increasing the pressure of said LNG to at least about 400 psia, creating a reservoir of carbon dioxide liquid at about the triple point thereof whi

A method for generating power from LNG and storing energy , which method comprises providing a source of LNG at a temperature of about -250°F. or lower, increasing the pressure of said LNG to at least about 400 psia, creating a reservoir of carbon dioxide liquid at about the triple point thereof which reservoir contains a substantial amount of solid carbon dioxide, vaporizing said LNG to natural gas by removing heat from CO2 at about the triple point temperature, heating said high pressure natural gas, expanding said heated natural gas to create rotary power, and employing the carbon dioxide in said reservoir in a useful manner which results in the creation of CO2 vapor that is subsequently reliquefied.