Khd Humboldt Wedag Gmbh

Heiko Schürmann

Carsten Eckert

Marc Feiss

Florian Nassenstein

Rolf Gussmann

Andreas Hand

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.

Method and system for the denitrification of flue gases by means of SNCR (selective non-catalytic reduction) and downstream catalyst for ammonia decomposition

A cement clinker production line with a calcining stage connected upstream of the rotary tubular kiln including an integrated calcining combustion chamber, with a CO-containing reduction zone whose size and reduction potential can be adapted to different NOcontents contained in the kiln exhaust gas and/or different types of secondary fuels used in the combustion chamber. The combustion chamber has an upper, raw-meal-free reducing zone with a feed for secondary fuels, and first tertiary partial airstream with sub-stoichiometric fuel combustion for gasifying the secondary fuels. The combustion chamber has a lower zone. The inflow for at least one raw meal partial stream and one second tertiary partial airstream are arranged in the junction region of the upper zone and the lower zone. The height (H) of the upper zone in relation to the height (h) of the lower zone has a ratio of approximately 5:1 to approximately 1:1.

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Leverkusen, Germany

Heiko Schürmann