To provide a method of economically removing sulfuric acid mist.
The exhaust gas treatment equipment is provided with an air pre-heating unit 3 for heating combustion air by exhaust gas discharged from a boiler; a heat recovery unit 11 for heating a heating medium by the exhaust gas; a wet type exhaust gas treatment device 6 for wet-treating the exhaust gas; a re-heating unit 13 for heating the exhaust gas by the heating medium; and a heating medium circulation line 15 for circulating the heating medium between the re-heating unit 13 and the heat recovery unit 11. The dew point of the sulfuric acid mist in the exhaust gas is between the temperature of the exhaust gas at an entrance of the heat recovery unit 11 and the temperature of the exhaust gas at a discharge port of a dust-collector 4 and is adjusted such that it becomes higher than the temperature of the exhaust gas at the discharge port of the dust-collector 4 by 30°C or more.
COPYRIGHT: (C)2004,JPO
Takanori Nakamoto
Toshio Katsube
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