Abstract: First,this paper briefly introduced the status of heat recovery from flue gas,and the value of heat recovery from flue gas to energy conservation and emission reduction in China. Then, it introduced the methods of heat recovery of flue gas from combined gas and steam cycle waste heat recovery boiler and the influence of heat recovery equipment on waste heat recovery boiler. Finally,the waste heat recovery efficiency of a 390 MW F-class gas turbine was compared and analyzed,the result showed that by recovering the waste heat of flue gas from combined gas and steam cycle waste heat recovery boiler,considerable economic benefits can be obtained on the basis of guaranteeing the safety of the equipment.

Key words: waste heat recovery boiler, waste heat utilization, economic analysis