Plant for production of cement with ­reduced emission of pollutant gases

(22) 12.04.2016

(43) 20.10.2016

(57) The invention relates to a plant for production of cement clinker from raw meal, having a calciner for deacidification of the raw meal and a rotary furnace for sintering of the deacidified raw meal to give cement clinker, wherein the deacidified raw meal, after passing through the calciner, flows through a cyclone preheating stage into the rotary furnace, and wherein a reactor connected upstream of the calciner on the flow path of the offgas from the rotary furnace to the calciner is provided, to which an inlet for the offgas from the rotary furnace leads, and the invention relates to a corresponding method of operating such a plant having a calciner and a rotary furnace, wherein the deacidified raw meal, after passing through the calciner, flows through a cyclone preheating stage into the rotary offgases from the rotary furnace into a reactor connected upstream of the calciner on the flow path of the offgases from the rotary furnace, wherein fuel is added to the reactor in a superstoichiometric amount in relation to the residence time of the offgases in the reactor, such that carbon dioxide present in the offgases is reduced to carbon monoxide. It is envisaged in accordance with the invention that at least one input air conduit for the supply of input air, preferably coming from a tertiary air conduit, is provided at at least one point in the reactor. In this way, it is possible to better control the Boudouard reaction that takes place therein.

(71) KHD Humboldt Wedag GmbH, Colonia-Allee 3, 51067 Köln (DE)

(84) ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)