Integrated LNG gasification and power production cycle

摘要

The present disclosure provides an integrated power generating system and method and liquefied natural gas (LNG) vaporization system and method. More particularly, heat from a CO2 containing stream from the power generating system and method can be used to heat the LNG for re-gasification as gaseous CO2 from CO2 containing stream is liquefied. The liquefied CO2 can be captured and/or recycled back to a combustor in the power generating system and method.

主权项

1. A method of generating power, the method comprising:
combusting a carbonaceous fuel in a combustor at a combustion pressure in the presence of oxygen and CO2 to produce a combined combustion product stream at the combustion pressure; expanding the combined combustion product stream in a turbine to generate power and form a turbine exhaust stream comprising CO2, the turbine exhaust stream comprising CO2 having a pressure that is less than the combustion pressure; passing the turbine exhaust stream comprising CO2 through a first heat exchanger so as to transfer heat from the turbine exhaust stream comprising CO2 to a CO2 recycle stream and form a cooled turbine exhaust stream comprising CO2; separating CO2 from the cooled turbine exhaust stream comprising CO2; passing a liquefied natural gas (LNG) stream and the CO2 separated from the cooled turbine exhaust stream comprising CO2 through a second heat exchanger so as to cool and liquefy the CO2 separated from the cooled turbine exhaust stream comprising CO2 and so as to heat and vaporize the LNG stream to form a liquefied CO2 stream and a gaseous natural gas (NG) stream, wherein the pressure of the CO2 separated from the cooled turbine exhaust stream comprising CO2 entering the second heat exchanger is less than the pressure of the turbine exhaust stream comprising CO2 exiting the turbine; passing both a fraction of the gaseous NG stream and the cooled turbine exhaust stream comprising CO2 through a third heat exchanger, the cooled turbine exhaust stream comprising CO2 passing through the third heat exchanger after passing through the first heat exchanger and prior to passing through the second heat exchanger; pressurizing the liquefied CO2 stream to form the CO2 recycle stream; and passing the CO2 recycle stream to the combustor.