THERMODYNAMIC ANALYSIS OF HEAT RECOVERY STEAM GENERATOR IN COMBINED CYCLE POWER PLANT by

Com bined cy cle power plants play an im por tant role in the pres ent en ergy sec tor. The main chal lenge in de sign ing a com bined cy cle power plant is proper uti li za tion of gas tur bine ex haust heat in the steam cy cle in or der to achieve op ti mum steam tur bine out put. Most of the com bined cy cle de vel op-ers fo cused on the gas tur bine out put and ne glected the role of the heat re-cov ery steam gen er a tor which strongly af fects the over all per for mance of the com bined cy cle power plant. The pres ent pa per is aimed at op ti mal uti li-za tion of the flue gas re cov ery heat with dif fer ent heat re cov ery steam gen-er a tor con fig u ra tions of sin gle pres sure and dual pres sure. The com bined cy cle ef fi ciency with dif fer ent heat re cov ery steam gen er a tor con fig u ra tions have been ana lysed parametrically by us ing first law and sec ond law of ther mo dy nam ics. It is ob served that in the dual cy cle high pres sure steam tur bine pres sure must be high and low pres sure steam tur bine pres sure must be low for better heat re cov ery from heat re cov ery steam gen er a tor. Key words: combined cycle, gas turbine, steam cycle, dual cycle, waste heat recover