| 摘要 |
<p>LNG (9) is pumped to high pressure (13) vaporized (19), further heated (21) and then expanded to create rotary power (29) that is used to generate electrical power (31). A reservoir of carbon dioxide at about its triple point (41) 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 During peak electrical power periods, liquid carbon dioxide is withdrawn therefrom, pumped to a high pressure (45), vaporized (47, 75) further heated (55), and expanded to create rotary power (57) which generates additional electrical power (59). The exhaust from a fuel-fired combustion turbine (61), connected to an electrical power generator (63), heats the high pressure carbon dioxide vapor. The discharge stream from the CO2 expander is cooled (53) and at least partially returned to the vessel (41) 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 During off-peak periods, CO2 vapor is withdrawn from the reservoir and condensed to liquid by vaporizing LNG, so that use is always efficiently made of the available refrigeration from the vaporizing LNG,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 (41).</p> |
