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Union Electric Company is a summer peaking utility, experiencing peak electrical load demands during the hot summer months. Combustion turbine generators are often used to meet the summer peak demands. However, the generating capability of a combustion turbine decreases as the ambient air temperature increases. When system peak demands are at their highest levels on the hottest days of the year, the generating capacity of the combustion turbines are at their lowest values. This lost generating capacity can be recovered by cooling the air entering the combustion turbines. Various combustion turbine inlet air cooling technologies were investigated for a General Electric Model 7B combustion turbine. The cooling technologies evaluated in the study were evaporative cooling, thermal energy storage (ice), on-line mechanical chiller, direct absorption chiller, steam absorption chiller with heat recovery steam generator (HRSG), and once-through cooling using well water. Conceptual designs, performance estimates, installation and operating costs were developed for each alternative.

Union Electric Company’s Combustion Turbine Inlet Air Cooling Study