Study to determine the cost-effectiveness of using steam-injected gas turbines with coal gasification equipment. Final report. [Intercooling]

Performance data, cost estimates and bus-bar power costs were developed for integrated gasification-gas turbine power plants. The British Gas/Lurgi slagging, fixed-bed gasifier was employed to produce clean fuel gas from coal. The clean fuel gas was fired in steam injected gas turbines. The gas turbines were based upon expected performance of GE LM-5000 gas turbines modified to accommodate mass injection of steam produced through turbine exhaust heat recovery. Gas turbine configurations with (ISTIG) and without (STIG) intercooled air compressors were examined and compared to a conventional combined cycle approach. Performance for the intercooled case was slightly poorer than the combined cycle case, while the non-intercooled case was considerably worse. Capital costs of both the STIG and ISTIG plants were estimated higher than the combined cycle. Costs of electricity from the STIG and ISTIG plants were also estimated to be higher than from the combined cycle plant, although the ISTIG and combined cycle costs were very close. 4 figs., 13 tabs.