COMPARATIVE ENERGY AND EXERGY ANALYSIS OF A POWER PLANT WITH SUPER-CRITICAL AND SUB-CRITICAL

Year 2018, Volume: 4 Issue: 6, 2423 - 2431, 29.09.2018

Burhanettin Çetin

https://doi.org/10.18186/thermal.465644

Cited By: 4

Abstract

The aim of this
study that how to effect live steam parameters reheat and feed water preheater
numbers on efficiencies of energy and exergy at coal-fired power plants.
Moreover, two desuperheaters and a regenerative turbine are added USCPP (Case
3) to approach best results. Soma Power Plant (Case 1) consists of one reheat
stage, two HPRHs and four LPRHs with one DEA. It 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 steam 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 power plant
efficiencies. USCPP which consists of two reheat stages, four HPRHs, six LPRHs
with one 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 Professional software and pressure drops at preheaters and reheats are
also considered. Some 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, respectively. 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 power 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 parameters.

Keywords

Thermal Efficiency, Exergy Efficiency, Sub-Critical Power Plant, Ultra-Supercritical Power Plant

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