Design and Performance Analyses of Condensing Heat Exchangers for Recovering Water and Waste Heat from Flue Gas.

摘要

There has been an increasing interest in new technologies to improve the efficiency of coal based thermal power plants and to reduce the consumption of cooling water for cooling towers. This report discusses the opportunities of recovering heat and water from flue gas using condensing heat exchangers.;Simluations were performed to develop heat exchanger designs for one or more heat exchangers used upstream and/or downstream of the wet FGD. The impact on water condensation efficiency, total heat transfer and total annual cost were analyzed for five different arrangements. The impact of heat exchanger design parameters such as heat exchanger tube diameter and tube transverse pitch was analyzed. Additionally, the prospects of precooling the flue gas using water spray and its impact on performance of heat exchanger was also studied.