Possibilities of the Regenerative Steam Cycle at Temperatures Up to 1600 F

The regenerative-steam-cycle heat-rate gains that may be realized at temperatures up to 1600 F are presented in this paper. These gains are calculated for a theoretical cycle and also for a practical cycle wherein such losses as extraction-piping pressure drop, heater-terminal temperature differences, and the like, are considered. An economic evaluation of the anticipated turbine heat-rate differences for various throttle conditions is presented. This evaluation includes such factors as fuel costs, load characteristics, auxiliary-power requirements, boiler efficiencies, and annual fixed charges. A method of comparing the heat-rate gains due to higher steam temperatures with those made possible by resuperheating is provided.