Patent ID: 8613794

Claim:
A process for producing a pressurised CO 2 stream in a power plant integrated with a CO 2 capture unit, the process comprising the steps of: (a) introducing hot exhaust gas exiting a gas turbine into a heat recovery steam generator unit to produce high-pressure steam and a flue gas stream comprising CO 2 ; (b) removing CO 2 from the flue gas stream comprising CO 2 by contacting the flue gas stream with an absorbing liquid in an absorber to obtain an absorbing liquid enriched in CO 2 and a purified flue gas stream; (c) contacting the absorbing liquid enriched in CO 2 with a stripping gas at elevated temperature in a regenerator to obtain regenerated absorbing liquid and a gas stream enriched in CO 2 ; (d) pressurising the gas stream enriched in CO 2 using a CO 2 compressor to obtain the pressurised CO 2 stream, wherein a first part of the high-pressure steam produced in the heat recovery steam generator unit is used to drive the CO 2 compressor by passing the first part of the high-pressure steam to an expander, which expander is coupled to the CO 2 compressor and discharges low-pressure steam, which low-pressure steam is used to provide at least part of the heat needed for the regeneration of the absorbing liquid; and (e) generating power by leading a second part of the high-pressure steam produced in the heat recovery steam generator unit to a steam turbine, which steam turbine is coupled to a generator and power is produced by the generator.