Inlet Air Cooling For A Frame 7EA Based Combined Cycle Power Plant

Presented at Power-Gen International
Las Vegas, Nevada


Sanjeev Jolly, P. E.
Donald W. Shepherd
Joseph A. Nitzken, P.E.
Caldwell Energy & Environmental, Inc.
Louisville, KY

Randall B. Cummings, P.E.
F.J. Linkous, Jr., P.E.
Lockwood Greene
Atlanta, GA


Refrigerated inlet air cooling is one of the most effective ways to increase the capacity of combustion turbines (CTs) during high ambient temperatures, yet the application has not received wide acceptance for large industrial type turbines. There are more than one hundred installations in which inlet air chilling is successfully applied to aeroderivatives, but only a handful of instances for large industrial type combustion turbines. The benefits are equally applicable to these machines as they are to aeroderivatives. The capacity enhancement will be even more cost effective for the new generation of CTs which are fired to higher temperatures and use less air per kW produced. The objective of this paper is to discuss the effects of chilling the inlet air for a GE Frame 7EA CT. An inlet air cooling system was installed at the Cogen Technologies' Camden Cogen facility during the spring of 1997. The cooling system consists of the latest chiller technology using non-ozone-depleting refrigerant R134a. This paper will address how the turbine capacity could be cost effectively increased during the summer months when demand is usually the highest. Several issues including the feasibility study, system description and its performance at various temperature/humidity conditions will be discussed in this paper. Field data shall be used to illustrate the benefits of inlet air cooling for turbine capacity enhancement.

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