Method for emission control of dioxin and/or furan waste gas pollutants in a cement clinker production line
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United States of America Patent
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Feb 15, 2005
Grant Date -
Jun 5, 2003
app pub date -
Nov 13, 2002
filing date -
Nov 30, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to provide a comparatively simple and cost-effective method for cement clinker production lines where especially raw materials and/or fuel/secondary fuel containing chlorine compounds and a partial gas extraction with an electrostatic dust collector as waste gas dust remover are used, with which the risk of emitting the waste gas pollutants dioxin and/or furan is eliminated, it is proposed in accordance with the invention that the extracted quantity of the partial gas extraction stream, after cooling and electrostatic dust removal, is held lower than the sum of the secondary air drawn through the rotary kiln and the tertiary air drawn past the rotary kiln, and to recirculate the cooled and dedusted partial gas extraction solely into an area of the clinker cooler in which the recuperation air is removed from the clinker cooler, and the dioxins and/or furans of the partial gas extraction are decomposed in the clinker cooler on the hot cement clinker and/or deposited and/or decomposed by the high temperature treatment in the burners of the rotary kiln and the precalcinator.
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