All electric LNG system and process
AssigneeBP Corporation North America Inc.
InventorsRichard Jones, Jr., Patrick B. Ward
Life of this patent
Estimating the term…
Abstract
A reduced carbon dioxide emissions system and method for providing power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process.
Claims15
An improved efficiency, reduced carbon dioxide emissions method for providing internally generated electric power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process, the method consisting essentially of:
- a) providing at least a portion of the electrical power for the refrigerant compression and for the light hydrocarbon gas liquefaction process from at least one electrical generator driven by at least one fossil fuel fired turbine, the at least one fossil fuel fired turbine being fueled by a compressed air stream and a light hydrocarbon gas stream and producing a high-temperature, high-pressure gas stream to power the turbine and discharge a high-temperature exhaust gas stream;
- b) passing the high-temperature exhaust gas stream to heat exchange with water or low-pressure steam to produce a higher pressure steam stream;
- c) passing the higher pressure steam stream to a steam turbine to drive at least one energy recovery electrical generator to produce electrical power;
- d) compressing a low-pressure refrigerant to an increased pressure in at least one refrigerant compressor driven by an electric motor powered by electrical power generated by the at least one electrical generator or the at least one energy recovery electrical generator;
- all of the required electrical power for the refrigerant compression and shared electrical power for the light hydrocarbon gas liquefaction process being supplied by the at least one electrical generator and the at least one energy recovery generator;
- and,
- e) providing and maintaining in condition for quick substitution for the at least one generator driven by the at least one fossil fuel fired turbine, at least one standby generator driven by at least one standby fossil fuel fired turbine.
An improved efficiency, reduced carbon dioxide emissions system for providing internally generated electric power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process, the system consisting essentially of:
- a) at least one electrical generator driven by a fossil fuel fired turbine fueled by a compressed air stream and a light hydrocarbon gas stream to produce a high temperature exhaust gas stream and operable to provide an electrical power supply for the light hydrocarbon gas liquefaction process;
- b) a line for passing the high-temperature exhaust gas stream to heat exchange with water or low-pressure steam to produce a higher pressure steam stream;
- c) a line for passing the higher pressure steam stream to at least one steam turbine having a higher pressure steam inlet and a low pressure steam outlet, the steam turbine being used to drive at least one energy recovery electrical generator to produce electrical power;
- d) a low-pressure refrigerant compressor driven by an electrical motor in electrical communication with the electrical power supply for the light hydrocarbon gas liquefaction process and powered by electrical power from the electrical power supply, the electrical power supply for the refrigerant compressor and light gas liquefaction process consisting of electrical power from the at least one electrical generator and the at least one energy recovery electrical generator;
- and,
- e) at least one standby fossil fuel fired turbine operatively connected to a generator and adapted for quick start up to substitute the standby fossil fuel fired turbine and generator for the at least one generator driven by a fossil fuel fired turbine when required for emergency power or when deemed necessary or desirable.
Dependencies are inferred from the claim text.