Abstract
The combined flue gas-steam heat regeneration cycle is a newly proposed concept. It combines boiler flue gas and turbine steam into a regeneration cycle so as to maximize the usage of thermal energy. Using low pressure extracted steam heats cold air. High temperature flue gas heats feed water for boiler. Re-ducting energy loss in the heat exchange. The optimal temperature of air at air preheater inlet, optimal temperature of feed water are calculated in this paper. Taking a ultra super-critical 1000MW unit as an example, the coal consumption can be reduced by 6.9g/KW.h.
