(222e) Multifunctional Carbon Filter Process For CO2, Nox, Sox, And Mercury Flue-Gas Clean-Up

A Multifunctional Carbon Filter Process (MCFP) is developed and evaluated for separating not only carbon dioxide but also other pollutants of power-plant flue gas, such as NOx, SOx and mercury. Relative to an amine-absorption benchmark, the cost of the recovered CO2 using a carbon-rich sorbent at ambient pressure can be reduced by a factor of 2 or more. Such a sorbent is selective at near ambient temperatures, easy to keep at constant sorption temperature, and easy to recover by direct steam heat because its heat of sorption is very low, which will be illustrated with laboratory data. Furthermore, MCFP is relatively insensitive to flue-gas moisture, which poses a serious problem for more hydrophilic sorbents such as zeolites. The MCFP technology can be integrated with a coal power plant toward producing an Enhanced Oil Recovery (EOR) grade CO2, which will be illustrated with laboratory and economic data for a Wyoming power plant.