METHOD FOR CONTROLLING AMMONIA CONTENT IN CEMENT FLUE GAS AND CEMENT PLANT WITH CONTROLLED AMMONIA EMISSION

摘要

The invention relates to a method for controlling an ammonia content in the exhaust gas (E) from a cement manufacturing plant wherein the gaseous stream (G) produced during sintering a raw meal (M) to form a cement clinker (C) is passed into a conditioning stage in which an amount of SO₂ is adjusted that suffices for reducing the ammonia to the desired level by reaction of ammonia with SO₂ to form ammonium sulfur compounds which are captured in a dedusting filter of the plant as solid material. The invention further provides a cement manufacturing plant comprising a raw material mill (1) for grinding a raw material to provide a raw meal, a preheater (2a) or a preheater/calciner (2) for preheating or preheating and calcining the raw meal, a kiln (3) for sintering the raw meal to a clinker, a cooler (4) for cooling the clinker and a dedusting filter for separating a gaseous stream from the preheater and/or the raw material mill into a solid dust and an exhaust gas, wherein a conditioning unit (5) receiving an adjusted amount of SO₂ and equipped with a device for measuring the content of ammonia and SO₂ in the gaseous stream from the preheater and/or the raw material mill is arranged before the dedusting filter or made integral with the dedusting filter.