Patent ID: 6855302

Claim:
A method for reducing an emission of waste gas pollutants dioxin and/or furan contained in a hot partial gas extraction stream during the production of cement clinker from raw meal, comprising the steps: extracting a pollutant-containing partial stream of a rotary kiln waste gas of a system for producing cement clinker, cooling the partial stream in a mixing chamber, dedusting the partial stream in an electrostatic dust collector, cooling the cement clinker from a rotary kiln in a connected cooler, using an exhaust air stream of the clinker cooler as a tertiary air separately or with the rotary kiln waste gas stream as a secondary air for precalcining the cement raw meal, extracting the pollutant-containing partial stream in a quantity which, after cooling and electrostatic dust removal, is lower than a sum of the secondary air drawn through the rotary kiln and the tertiary air drawn past the rotary kiln, removing a recuperation air from a recuperation zone of the clinker cooler, recirculating the cooled and dedusted partial stream solely into the recuperation zone of the clinker cooler from which the recuperation air is removed, and one of decomposing the dioxins and/or furans in the clinker cooler on the cement clinker, depositing the dioxins and/or furans on the cement clinker in the rotary kiln and decomposing the dioxins and/or furans by a high temperature treatment in the rotary kiln.