在用水要進入蒸汽冷凝器加熱之前，先以煙道氣預熱的一種熱交換器。煙道氣所含的蒸汽因被冷卻而凝結。(Flue-gas condenser: a heat exchanger where water is preheated by the flue-gas before it is heated in the steam condenser. The vapour content in the flue-gas thus condenses as it is cooled by the heating water)
