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 producing a high pressure CO2 stream.  The purpose of this study is to perform a preliminary energy study and develop a method to implement this sorbent in an IGCC power plant.  The proposed CO2 separation process involves sorption of CO2 at 200 �C and regeneration at 385 �C. The operational temperature is ideal for CO2 capture downstream to the water-gas shift reactor in an 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 technology.  Additionally, the sorbent is able to operate in the presence of steam, which distinguishes it from other technologies which require, an energy-intensive, drying step prior to CO2 separation.  Regeneration or the sorbent is carried out at 280 psi and 385-400 �C resulting in a high pressure CO2 product stream, which significantly reduces the auxiliary load traditionally associated with CO2 compression for sequestration.  The chemistry of the sorption process also reduces the amount of steam traditionally required for the water-gas shift reactor by 50%, also increasing the overall efficiency of the plant.  The incorporation of the sorbent and the described methods resulted in an overall IGCC power plant efficiency greater than that of the competing Selexol technology.

Energy efficient process for CO<sub>2</sub> separation from pre-combustion fuel gas using Mg(OH)<sub>2</sub> sorbent

245th National Meeting (2013)

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Energy efficient process for CO2 separation from pre-combustion fuel gas using Mg(OH)2 sorbent

Energy efficient process for CO₂ separation from pre-combustion fuel gas using Mg(OH)₂ sorbent