Patent ID: 7243510

Claim:
A reduced carbon dioxide emissions method for providing power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process, the method comprising: a) compressing a refrigerant in a refrigerant compressor driven by at least one light hydrocarbon gas-fired turbine to produce all of the compressed refrigerant for the light hydrocarbon gas liquefaction process with the at least one turbine producing power solely for driving the compressor and an exhaust gas stream at an elevated temperature; b) passing all of the exhaust gas stream to a heat exchanger and producing steam at an elevated temperature and pressure from water or low-pressure steam by heat exchange with the exhaust gas stream; c) driving a steam turbine unconnected mechanically to the light hydrocarbon gas-fired turbine or refrigerant compressor with the steam from b); and, d) driving an electrical power generator with the steam from b) to produce electrical power for use in the light hydrocarbon gas liquefaction process.