摘要：The aim of this study that ho w to effect live steam parameters reheat and feed water preheater numbers on efficiencies of energy and exergy at co al - fired power plants. Moreover, two desuperheaters and a regenerative turbine are added USCPP (Case 3) to appr oach best results. Soma Po wer Plant (Case 1) consists of one reheat stage, two HPRH s and four LPRHs with one DEA. I t is operated sub - critic and coal is used for a fuel. Live steam conditions of Soma Power Plant set at 13,92 MPa and 540 . C, and the reheat s team is reheated to 540 . C. Supercritical Power Plant (Case 2) consists of the same main components of Case 1. However, steam parameters of Case 2 are increased to 262.5 Bar and 600 . C to determine impact of the steam parameters on po wer plant efficiencies . USCPP which co nsists o f two reheat stages, fo ur HPRHs, six LPRHs with o ne DEA is designed to generate live steam under nominal conditions of 30 Bar and 600 . C. Besides, reheat steam are heated to 620 . C. Simulations have been carried out Ebsilon Professi onal software and pressure drops at preheaters and reheats are also considered. So me assumptions are made in the analysis. The thermal and exergy efficiencies of USCPP increase by 9.241 and 8.06 percentage points compared with Soma power plant, respectivel y. The results of this study that live steam parameters which are increased from sub - critical values to super - critical values have enormous influence on energy and exergy efficiencies. Secondly, adding second reheat stage has positive impact to improve po wer plant efficiencies. Finally, augmenting feed water preheater number, adding two desuperheater and one regenerative turbine increase power plant efficiencies. However, optimum numbers of feed water preheaters are determined considering economic paramete rs.
关键词：Thermal ; Efficiency; ; Exergy ; Efficiency; ; Sub ; - ; Critical Power Plant; ; Ultra ; - ; Supercritical Power ; Plant
