Klaus Lackner (Professor, EEE)
For a power plant designed to capture carbon dioxide there may be no need for the flue stack of a conventional power plant. In power plants that use oxygen instead of air, the combustion product yields steam that condenses to water and carbon dioxide that will be sequestered. Pollutants, such as, sulfur, mercury, and fine particulates, may be stored with the carbon dioxide gas.
We plan look beyond the oxy-fuel combustion plants currently under construction in Europe and elsewhere by developing a technology road map that integrates oxy-fuel combustionconcepts with gasification, high temperature oxygen separation membranes, advanced turbines, fuel cells, and advanced combustion in pressurized fluidized beds.
As an example (as seen in illustration below) we propose to fully integrate oxygen separation into the oxy-fuel plant and develop a topping cycle akin to those in an IGCC plant but without combustion products being released to the air. After the compressor stage of the turbine, the oxygen is separated from the compressed air through high temperature mixed oxide membranes.The oxygen immediately mixes with fuel gas which is combusted leaving behind a mixture of excess oxygen, steam, and carbon dioxide, which provides the oxygen for the more conventional part of the oxygen-blown power plant.