TY - JOUR
TI - Performance improvement of a 330MWe power plant by flue gas heat recovery system
AU - Xu Changchun
AU - Xu Min
AU - Zhao Ming
AU - Liang Junyu
AU - Sai Juncong
AU - Qiu Yalin
AU - Xiang Wenguo
JN - Thermal Science
PY - 2016
VL - 20
IS - 1
SP - 303
EP - 314
PT - Article
AB - In a utility boiler, the most heat loss is from the exhaust flue gas. In  order to reduce the exhaust flue gas temperature and further boost the plant  efficiency, an improved indirect flue gas heat recovery system and an  additional economizer system are proposed. The waste heat of flue gas is used  for high-pressure condensate regeneration heating. This reduces high pressure  steam extraction from steam turbine and more power is generated. The waste  heat recovery of flue gas decreases coal consumption. Other approaches for  heat recovery of flue gas, direct utilization of flue gas energy and indirect  flue gas heat recovery system, are also considered in this work. The proposed  systems coupled with a reference 330MWe power plant are simulated using  equivalent enthalpy drop method. The results show that the additional  economizer scheme has the best performance. When the exhaust flue gas  temperature decreases from 153℃ to 123℃, power output increases by 6.37MWe  and increment in plant efficiency is about 1.89%. For the improved indirect  flue gas heat recovery system, power output increases by 5.68MWe and the  increment in plant efficiency is 1.69%.