Method for emission control of dioxin and/or furan waste gas pollutants in a cement clinker production line

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.