The authors consider gas-steam combined cycle power plants derived from existing steam power plants by inserting a Brayton cycle gas turbine as a topper. The conversion of superheated, superheated-reheated and regenerative steam cycle power plants is examined. Two methods of conversion are studied: replacing the original steam generator with a recovery boiler either with afterburning at the gas turbine exhaust or not, and keeping the steam generator of the working steam plant in operation and burning fuel inside the gas turbine exhaust gases. In the latter instance the possibility of adding external air, through the steam generator air preheater, to the gas turbine exhaust gases is considered too. The combined overall power plant efficiency and the gas-to-steam-power ratio are evaluated and a comparison is made between the values obtained for the two methods. The overall efficiency is also compared with that of the original working steam plant. The study shows that maximum overall efficiencies are attained when adopting a recovery boiler and that the afterburning at the gas-turbine exhaust is not always advantageous.
A comparative study on the ways of converting steam power plants to steam-gas combined cycle power plants / G., Negri Di Montenegro; R., Bettocchi; Cantore, Giuseppe; Borghi, Massimo; G., Naldi. - STAMPA. - Volume 1:(1988), pp. 301-306. (Intervento presentato al convegno 23rd Intersociety Energy Conversion Engineering Conference tenutosi a Denver, CO, US nel 31 July- 5 August 1988).
A comparative study on the ways of converting steam power plants to steam-gas combined cycle power plants
CANTORE, Giuseppe;BORGHI, Massimo;
1988
Abstract
The authors consider gas-steam combined cycle power plants derived from existing steam power plants by inserting a Brayton cycle gas turbine as a topper. The conversion of superheated, superheated-reheated and regenerative steam cycle power plants is examined. Two methods of conversion are studied: replacing the original steam generator with a recovery boiler either with afterburning at the gas turbine exhaust or not, and keeping the steam generator of the working steam plant in operation and burning fuel inside the gas turbine exhaust gases. In the latter instance the possibility of adding external air, through the steam generator air preheater, to the gas turbine exhaust gases is considered too. The combined overall power plant efficiency and the gas-to-steam-power ratio are evaluated and a comparison is made between the values obtained for the two methods. The overall efficiency is also compared with that of the original working steam plant. The study shows that maximum overall efficiencies are attained when adopting a recovery boiler and that the afterburning at the gas-turbine exhaust is not always advantageous.
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