METHOD OF REDUCTION OF EMISSION OF SO FROM PLANT PRODUCING CEMENT CLINKER AND CEMENT CLINKER PLANT FOR REALIZATION OF THIS METHOD Russian patent published in 2005 - IPC

FIELD: method of reduction of SO_x emissions.

SUBSTANCE: proposed method includes preheating and roasting of raw material mixture in plant including cyclone preheater and roasting furnace. Catalyst in form of chloride and/or mixture of several chlorides is introduced into preheater at stage of highest cyclone or cyclone preceding relative to highest one. Catalyst is directed downward to roasting furnace through preheater; definite amount of waste gases containing vaporous catalyst is extracted from roasting furnace. Flow of waste gases thus extracted is cooled for converting the catalyst to solid state. Solid agent is separated from cooled flow of waste gases and some part of separated solid agent containing catalyst is fed to preheater by recycle, thus considerably reducing the SO_x emissions. Chloride and/or mixture of chlorides activate catalytically reaction of SO₂ with CaO forming CaSO₃ and additionally activate reaction of SO₂ with CaCO₃ forming CaSO₃ and CO₂. Thus, CaCO₃ is present in considerable amount and SO₂ may be reduced without additional reagents.

EFFECT: enhanced efficiency.

8 cl, 1 dwg