THERMODYNAMIC ANALYSIS OF OPERATION OF GIVEN STEAM- TURBINE POWER PLANT WITH REGENERATIVE HEATING OF WATER

U radu je analiziran termodinamički stupanj djelovanja Rankineova procesa sa rekuperativnim i regenerativnim zagrijavanjem napojne vode te pregrijavanjem pare nakon djelomične izentropske ekspanzije u turbini visokog tlaka.Proračun je pokazao da jedan uređaj regenerativnog zagrijavanja napojne vode podiže termodinamički stupanj djelovanja Rankineova procesa za 2% dok rekuperativno zagrijavanje napojne vode podiže termodinamički stupanj djelovanja za 1%.Utvrđeno je da svakim uvođenjem novog uređaja za rekuperativno ili regenerativno zagrijavanje napojne vode stupanj termodinamičkog djelovanja raste nižim intezitetom te u jednom trenutku uvođenje novih uređaja prestaje biti isplativo.In this paper the thermal efficiency of Rankine cycle with two feed water heaters, an open feed-water heater and closed feed water heater and reheating of the steam after partly isentropic expansion in high pressure turbine. Mathematichal analysis has shown that open feedwater heater raises thermal efficiency for two percent and closed feedwater heater for one percent. Themal efficiency is increased with incorporation of every new open or closed feedwater heater but with less and less gradient and after a recent number of feedwater heaters it stops being payable