CONVERSION OF STEAM AND GAS POWER PLANTS TO COMBINED CYCLES

This paper studies the repowering of already operating steam or turbogas plants through the fitting of a turbogas unit as topper in the first case, and a steam unit as bottomer in the second, thus obtaining steam-gas combined plants. As to steam plants, a methodology has been defined which permits evaluation of both the overall efficiency and gas to steam power ratio of the derived combined plant obtained by superposing a turbogas unit on any assigned steam plant so as to permit integral utilization or minimum modification of the steam section.