Importance

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Abstract

A process for recovery of CO₂ from a post-combustion gas includes pre-concentrating a CO₂ component of the post-combustion flue gas by passing the post-combustion gas through a CO₂-selective membrane module to provide a CO₂-enriched permeate stream and a CO₂-lean reject stream. Next, in a CO₂ absorber, both the CO₂-enriched permeate stream and CO₂ lean reject stream, fed to separate feed locations on the CO₂ absorber, are contacted with a scrubbing solvent to absorb CO₂ and provide a carbon-rich scrubbing solvent. Finally, absorbed CO₂ is stripped from the carbon-rich scrubbing solvent by a two-stage CO₂ stripping system. The CO₂-selective membrane may be a high flux, low pressure drop, low CO₂ selectivity membrane. The two stage stripping system includes a primary CO₂ stripping column for stripping CO₂ from the carbon-rich scrubbing solvent exiting the CO₂ absorber, and a secondary CO₂ stripping column for stripping CO₂ from a carbon-lean scrubbing solvent exiting the primary CO₂ stripping column. Apparatus for CO₂ removal from post-combustion gases in a pulverized coal power plant incorporating the described processes are described.

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First Claim