| 摘要 |
Flue gases (6) discharged from a flue gas desulfurizer (5) are fed to an absorption tower (7) and the heat recovered by the absorption is transferred to the flue gases and/or the absorbent (8). The water which has been absorbed by the absorbent is expelled therefrom as vapor by desorption, e.g., by a stripping with flue gas in a preliminary scrubber (44), which precedes the flue gas desulfurizer (5). By means of a pump (16) the absorbent (8) is circulated between the absorption tower (7) and the preliminary scrubber (44). The flue gases (4) discharged from the boiler furnace (1) flow through an air preheater (2), the preliminary scrubber (44), the flue gas desulfurizer (5) and the absorption tower (7), in that order, and are then discharged into the open through a chimney (19). The combustion air (3) is supplied to the boiler furnace (1) through a heat exchanger (45) incorporated in the circulating system for the absorbent (8) and through the air preheater (2).
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