EXHAUST GAS TREATING APPARATUS

摘要

The exhaust gas processing device is composed of an air preheater 3 for preheating air for combustion in a combustion device; a gas-gas heater (GGH) heat recovery device (HRD) 4 composed of a heat transfer tube (HTT) for recovering the heat of the exhaust gas to a heat medium; a dust collector 5; a wet-type desulfurization device 7; a GGH re-heater (RH) 8 composed of a htt for heating the exhaust gas at its outlet by using the heat medium supplied from the GGH HRD 4, which are installed in that order from the upstream to the downstream of an exhaust gas duct of the combustion device, and the heat transfer tube of the HRD 4 is squarely arranged in the gas flow direction in such a manner that the exhaust gas flow rate between HTTs adjacent in the direction orthogonal to the gas flow direction is 10 m/s or lower.