METODE UNTUK MENGURANGI ASAM SULFAT DAN ANHIDRIDA SULFAT YANG TERDAPAT DALAM GAS BEKAS PEMBAKARAN DAN SISTEM ALIRAN GAS BEKAS PEMBAKARAN

摘要

PROBLEM TO BE SOLVED: To efficiently lower sulfuric acid and sulfuric anhydride in a combustion gas of a boiler or the like fueled with a fossil fuel by adding an SO₃ decreasing agent to the combustion gas and reducing sulfuric acid and sulfuric anhydride contained in the combustion gas. ;SOLUTION: An SO₃ decreasing agent is added to a combustion gas of a boiler and H₂SO₄ and SO₃ in the combustion gas are reduced to H₂SO₃ and SO₂ and to decrease H₂SO₄ and SO₃ in the combustion gas. As the SO₃ decreasing agent to be used, hydrogen gas is suitable from a viewpoint of reactivity. Concretely, an SO₃ decreasing agent supply apparatus 11 for adding hydrogen gas as an H₂SO₄ and SO₃-decreasing agent is installed in the point where the concentrations of H₂SO₄ and SO₃ are increased, that is the upstream side of an air preheating apparatus 7 and the downstream side of a denitration catalyst 6 in a flue 5 of a boiler and the SO₃ decreasing agent addition point is preferably set at a point in the downstream side of a combustion apparatus where the combustion gas temperature is within 300-1,000°C.;COPYRIGHT: (C)1999,JPO