Patent ID: 7296994
Filing Date: 2007-11-20
Classification: C04B,F27B,F27D

Abstract:
1. A method for the production of cement clinker from raw cement meal comprising the steps of: preheating the raw cement meal in at least one heat exchanger string by directing a flow of exhaust gas from a rotary tubular kiln through the heat exchanger string and towards a system filter, burning the raw cement meal in a sintering stage of the rotary tubular kiln to form cement clinker, cooling the cement clinker in a cooler following the tubular kiln, removing a partial hot flow of the rotary kiln exhaust gas as a bypass gas flow prior to the exhaust gas passing though the system filter, the bypass gas flow being laden with at least one of dust loads, gaseous harmful substances and vaporous harmful substances, introducing the bypass gas flow into a mixing chamber, extracting at least one partial stream of the non-dedusted system exhaust gas present in the cement clinker production line at a location upstream of the system filter, cooling the bypass gas flow in the mixing chamber by the introduction into the mixing chamber of the partial stream of exhaust gas to form a mixed gas flow, removing the mixed gas flow from the mixing chamber and returning the mixed gas flow into the system exhaust gas flow, downstream of the partial exhaust gas flow extraction location and upstream of the system filter, and thereafter, separating dust containing harmful substances from the cooled bypass gas flow.