Abstract: In a system involving CO2 capture having an acid gas removal system to selectively remove CO2 from shifted syngas, the acid gas removal system including at least one stage, e.g. a flash tank, for CO2 removal from an input stream of dissolved carbon dioxide in physical solvent, the method of recovering CO2 in the acid gas removal system including: elevating a pressure of the stream of dissolved carbon dioxide in physical solvent; and elevating the temperature of the pressurized stream upstream of at least one CO2 removal stage.

Abstract: A turbomachine includes a compressor section, a turbine section operatively connected to the compressor section, a combustor fluidly connected between the compressor section and the turbine section, and a carbon dioxide (CO2) extraction system fluidly connected to the combustor. The CO2 extraction system includes a CO2 separator. The CO2 separator separates a CO2 laden inlet gas stream into a first gas stream and a second gas stream. The first gas stream is substantially free of CO2 and the second gas stream comprises CO2. The first gas stream is directed to the combustor and the second gas stream is passed through a discharge conduit.

Abstract: An integrated gasification combined cycle (IGCC) system involving CO2 capture is provided comprising a CO2-selective membrane, a pre-compressor, and a sulfur gas removal system to selectively remove H2S and CO2 from shifted syngas, wherein the pre-compressor increases the permeate stream from the CO2-selective membrane from a first pressure to a second pressure prior to entering the sulfur removal system. Also provided herein is a method of maintaining a substantially constant pressure in a sulfur removal system, comprising introducing a feed gas stream to a CO2-selective membrane for separation into a syngas rich stream and a permeate gas stream, wherein the permeate gas stream is at a first pressure; increasing the permeate gas stream from the first pressure to a second pressure; and introducing the permeate gas stream at the second pressure to a sulfur removal system downstream of the pre-compressor.

Abstract: In a system involving CO2 capture having an acid gas removal system to selectively remove CO2 from shifted syngas, the acid gas removal system including at least one stage, e.g. a flash tank, for CO2 removal from an input stream of dissolved carbon dioxide in physical solvent, the method of recovering CO2 in the acid gas removal system including: elevating a pressure of the stream of dissolved carbon dioxide in physical solvent; and elevating the temperature of the pressurized stream upstream of at least one CO2 removal stage.