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METHOD AND SYSTEM FOR THE DENITRIFICATION OF FLUE GASES BY MEANS OF SNCR (SELECTIVE NON-CATALYTIC REDUCTION) AND DOWNSTREAM CATALYST FOR AMMONIA DECOMPOSITION
METHOD AND SYSTEM FOR THE DENITRIFICATION OF FLUE GASES BY MEANS OF SNCR (SELECTIVE NON-CATALYTIC REDUCTION) AND DOWNSTREAM CATALYST FOR AMMONIA DECOMPOSITION
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机译:SNCR(选择性非催化还原)和氨分解的下游催化剂对烟气进行脱硝的方法和系统
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摘要
A method for denitrification of flue gases and a system, wherein flue gases generated in a rotary kiln are conveyed to a calcining zone for the deacidification of raw cement meal. Aqueous ammonia solution, ammonia, or ammonia-releasing substances for denitrifying the flue gases injected into the calcining zone according to the method of selective non-catalytic reduction (SNCR), and the flue gas stream, together with an ammonia slip generated during the denitrification, is passed through a heat exchanger and through at least one dedusting device. The flue gas is guided through a exhaust gas line via a catalyst for the decomposition of excess ammonia with residues of nitrogen oxide in accordance with a method of selective catalytic reduction (SCR), wherein the catalyst is arranged in a reactor provided in the exhaust line, and is no larger than is required for a sufficient decomposition of the ammonia.
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