| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust heat recovery boiler in which soot and dust are trapped with high efficiency not to be released into the air. SOLUTION: Considering an allowance or a site temperature deviation for preventing a temperature in a gas flue, measured by a temperature gauge 14 provided on the most downstream side of the gas flue 2 in which a superheater 3, an economizer 4 and a flue gas denitration device 6 are arranged, from being a water vapor dew point or lower, vapor is introduced from the outside through a pipe 15 into the superheater 3 on the upstream side at the time when reaching a set temperature added with 10°C to the water vapor dew point, for example. The superheater 3 is used as a heating source to increase the temperature of gas around the superheater 3 and gradually increase an atmospheric temperature up to the most downstream side along with a gentile gas flow toward a stack 8 on the downstream side. When a temperature on the gas side is increased, a metal temperature on the outer surface of a heat transferrer in contact with the gas and the temperature of ammonium sulfate or acidic ammonium sulfate deposited to the heat transferrer are increased to maintain a drying condition at all times. COPYRIGHT: (C)2006,JPO&NCIPI
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