Process and plant for the production of cement clinker or another mineral product

摘要

A method is provided for producing cement clinker or another mineral product, in which between a furnace 2 and a thermal preconditioning device 1, 3 a by-pass gas loaded with at least one circulation-forming substance, in particular an alkali, a chloride or a sulfur compound, in the gas phase branched off from the exhaust gas of the furnace 2 and the remaining residual exhaust gas of Vorkonditioniervorrichtung 1, 3 is supplied. The bypass gas is then cooled to the extent that the substance condenses specifically on a surface of a condensation device 7, so that the substance can be removed from the condensation device 7 separately from the purified bypass gas. The purified bypass gas is then returned to the residual exhaust gas, in particular to the residual exhaust gas flowing in the preconditioning device 1, 3. Consequently, a condensation device is to be provided which serves for condensation caused by deposition and thus discharge of the substance from the bypass gas. A commonly provided use of entrained with the bypass gas oven dust as a carrier material to which the substance can accumulate, is therefore not required and should be avoided as much as possible.