| 摘要 |
Described is a method as well as a plant for manufacturing cement clinker, by which method cement raw materials are preheated in a preheater (1), calcined in suspension with hot gases in a calciner (2, 20), separated from the gases in a cyclone (2a), burned into cement clinker in a kiln (3) and subsequently cooled in a cooler (4) by which method a quantity of calcined raw material with a high content of CaO is extracted via a calcination stage (2, 20) by means of an additional separation cyclone (5a). The method and the plant are peculiar in that the gases which are diverted from the additional separation cyclone (5a) are cooled to a temperature of maximum 850 °C by means of cement raw materials which are introduced into the gas stream. It is hereby obtained that the quantity of material which is extracted by means of the additional cyclone can be adjusted by means of known means in a more reliable manner than has hitherto been possible, while also significantly reducing the risk of alkali-induced clogging. This is due to the fact that the lower temperature allows utilization of generally known control means and the fact that the alkali in the gases will condense and settle on particles in the gases at temperatures which are lower than 850 °C. |
