Reduced carbon dioxide emission system and method for providing power for refrigerant compression and electrical power for a light hydrocarbon gas liquefaction process
AssigneeBP Corporation North America Inc.
InventorsRichard Jones, Jr., Patrick B. Ward
Life of this patent
Estimating the term…
Abstract
A reduced carbon dioxide emission system and method for providing power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process.
Claims20
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.
A reduced carbon dioxide emission system for providing power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process:
- a) a refrigerant compressor having a low-pressure gaseous refrigerant inlet and an increased pressure refrigerant outlet and shaft coupled to and driven by a light hydrocarbon gas-fired turbine with the turbine having a high-temperature exhaust gas outlet, the refrigerant compressor compressing all the compressed refrigerant for the light hydrocarbon gas liquefaction process;
- b) a heat exchanger having a water or a low-pressure steam inlet and a high-pressure steam outlet and a high-temperature exhaust gas inlet in fluid communication with the high-temperature exhaust gas outlet and a reduced temperature exhaust gas outlet so that all of the high-temperature exhaust gas passes in heat exchange with the water or low-pressure steam to produce high-pressure steam;
- c) an electric generator unconnected mechanically to the refrigerant compressor or the light hydrocarbon gas-fired turbine and driven by the high-pressure steam to produce electrical power for use in the light hydrocarbon gas liquefaction process;
- and,
- d) a line in fluid communication with the increased pressure refrigerant outlet and a compressed refrigerant inlet to the light hydrocarbon gas liquefaction process.
A reduced carbon dioxide emissions method for providing power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process from which the carbon dioxide emissions are reduced by from about thirty-five to about sixty percent, the method consisting essentially of:
- a) compressing a refrigerant in a refrigerant compressor at least partially driven by a light hydrocarbon gas-fired turbine to produce all of the compressed refrigerant for the light hydrocarbon gas liquefaction process with the turbine producing power solely for driving the compressor and an exhaust gas stream at a resulting elevated temperature;
- b) passing all of the resulting 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.
A reduced carbon dioxide emission system for providing power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process from which the carbon dioxide emissions are reduced by from about thirty-five to about sixty percent, the system comprising:
- a) a refrigerant compressor having a low-pressure gaseous refrigerant inlet and an increased pressure refrigerant outlet and shaft coupled to and driven by a light hydrocarbon gas-fired turbine with the turbine having a high-temperature exhaust gas outlet, the refrigerant compressor compressing all the compressed refrigerant for the light hydrocarbon gas liquefaction process;
- b) a heat exchanger having a water or a low-pressure steam inlet and a high-pressure steam outlet and a high-temperature exhaust gas inlet in fluid communication with the high-temperature exhaust gas outlet and a reduced temperature exhaust gas outlet so that all of the high-temperature exhaust gas passes in heat exchange with the water or low-pressure steam to produce high-pressure steam;
- c) an electric generator unconnected mechanically to the refrigerant compressor or the light hydrocarbon gas-fired turbine and driven by the high-pressure steam to produce electrical power for use in the light hydrocarbon gas liquefaction process;
- and,
- d) a line in fluid communication with the increased pressure refrigerant outlet and a compressed refrigerant inlet to the light hydrocarbon gas liquefaction process.
Dependencies are inferred from the claim text.