TREATMENT OF EXHAUST GASES FROM CEMENT MANUFACTURING

Abstract

Process for purifying exhaust gas from cement clinker production in a rotary kiln. Raw materials in a mill to form a raw powder are ground in a raw meal preheater with the exhaust gas from the rotary tubular kiln in the counter-current flow is preheated and optionally pre-calcined, preheated and optionally.Pre-calcined raw material is supplied to the rotary kiln and in the rotary tubular kiln to give cement is baked the exhaust gas of the rotary tubular kiln before entering the selective preheater the non-catalytic reduction of nitrogen oxide with a reagent which provides ammonia is denitrified according to the invention the exhaust gas from the preheater and a gas conditioning is subjected to a catalytic oxidation of ammonia the objective is also by a gas conditioning device and the catalytic oxidation obtained arranged between preheater and mill.