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I would like to know the methods to recover the excess heat from the flue gas that is been send out through stack. It is a Combined Cycle Power plant of Capacity of 350MW, 2 pressure stage HRSG. At peak load of GT 1 that is 115MW the flue gas been send out is 120c. But now the production is 101MW and the flue gas being send out is 124c, excess of 4 degree is wasted. I'd like to know the best method to recover that 4 degree so that the efficiency of plant can b increased, as design changes may increase cost and risk of cold corrosion in the stack.
NB:- Already thought of recovering the waste heat my increasing the surface area of economizer, by adding additional loop.
NB:- Already thought of recovering the waste heat my increasing the surface area of economizer, by adding additional loop.