Process for CO2 Capture from High-Pressure and Moderate-Temperature Gas Streams

Abstract

A novel CO2 capture process was developed using a Mg(OH)2-based sorbent suitable for warm gas CO2 removal from high-pressure coal gasification gas streams. The purpose of this study is to perform a preliminary energy study and develop a method to implement this sorbent in a power plant. The proposed CO2 removal process involves sorption of CO2 at 200–300 °C and regeneration at 385 °C. The operational temperature is ideal for CO2 capture downstream to the water–gas shift reactor in an integrated gasification combined cycle (IGCC) power plant but is applicable to other warm gas cleanup processes as well. This technology offers the ability to fully utilize the potential efficiency increases associated with warm gas clean up. Additionally, the sorbent is able to operate in the presence of steam, which distinguishes it from other technologies that require an energy-intensive drying step prior to CO2 separation. Regeneration is carried out at 280 psi and 400 °C, resulting in a high-pressure CO2 product stream, ...