Reverse heat exchanging system for boiler flue gas condensing and combustion air preheating

摘要

A condensing heat exchanger for removing acidic vapors and recovering residual waste heat energy normally rejected into the atmosphere from a fossil fueled boiler flue gas stream, wherein the waste heat energy in the boiler flue gas is recovered by multiple evaporative and condensing heat exchangers and by a heat pump refrigeration system to recover heat energy from the flue gas stream and to preheat the boiler combustion air stream and boiler feed water stream.