APPARATUS FOR TREATMENT HIGHLY CONCENTRATED SO2 GAS CONTAINING EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To efficiently remove SO₃ formed by oxidizing SO₂ gas contained in exhaust gas in a high concn. without using NH₃ by providing a calcium carbonate supply means adding a fine powder of CaCO₃ to the exhaust gas to the inlet part of a boiler economizer. ;SOLUTION: Fuel is supplied to a boiler 1 to be burnt and the exhaust gas generated as the result of burning of the fuel is introduced into the high temp. electric precipitator 2 on the downstream side of the boiler 1 through a boiler economizer 4. At this time, CaCO₃ as an SO₃-absorbent is injected into the exhaust gas in the vicinity of the outlet of the boiler economizer 4 by a calcium carbonate supply means 5a to absorb and remove SO₃ by the reaction of CaCO₃ and SO₃. The exhaust gas from which SO₃ is removed by this constitution is subsequently introduced into the high temp. dust collector 2 and the gas from which solid matter is removed is discharged to the atmosphere through various apparatuses such as a denitration apparatus 3 or a highly conc. SO₂ exhaust gas treatment apparatus 10.;COPYRIGHT: (C)1998,JPO