MITIGATION OF GREENHOUSE GASES FROM GAS-TURBINE POWER-PLANTS

The results of an analysis of the performance and cost impacts for red uction of the major greenhouse gas emission, CO2 from the Humid Air Tu rbine (HAT) cycle as compared to an advanced steam cooled combined cyc le are presented. The flow rate of the cooled exhaust gas from the HAT cycle to be treated in the CO2 recovery unit is significantly lower w hile the CO2 concentration of this feed gas is higher than that in a c ombined cycle which reduces both the operating and the capital costs o f the CO2 recovery unit. The water recovered from the exhaust of the H AT cycle is recycled, thus greatly reducing the water consumption of t he power plant. The cycle with its inherently high thermal efficiency and low NOx emissions also ''attacks the problem at the source'' with regard to the total greenhouse gas emissions. A capital cost saving of approximately $50/KW is achieved with the FT4000 HAT as compared to t he combined cycle when CO2 recovery is incorporated, despite the large r advanced combined cycle plant benefiting from economies of scale.