Impact Of Heat Rate, Emissions, And Reliability From The Application Of Wet Compression On Combustion Turbines


Donald W. Shepherd
Caldwell Energy Company
Louisville, KY

Donald Fraser
Siemens Westinghouse
Orlando, Florida


Wet compression technology has been successfully installed on over 40 combustion turbines around the world. Wet compression systems have been justified due to the significant power gains achieved. What has not been discussed is the impact this technology has on the efficiency (heat rate), emissions and reliability of the combustion turbine.

One significant advantage of wet compression systems over other turbine inlet cooling power augmentation technologies is that gains are not restricted by ambient conditions. As a result, the megawatt-hours during the year are much higher than with any other technology, resulting in quicker payback and maximum net present value. Another benefit is that the application of wet compression is complementary to other turbine inlet cooling technologies like evaporative cooling, fogging or chilling. There are also benefits relating to heat rate, emissions and reliability for a properly designed and installed system.

This paper presents computational and field data that illustrates that there is more to gain than merely addition power output. Experience will be drawn from all types of combustion turbines: aeroderivitive, mature and advanced. The information will be presented in a format that will accurately depict all the benefits of wet compression technology allowing users to fully understand these benefits.

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