PROCESS AND APPARATUS FOR PRODUCING CEMENT

摘要

In the production of cement, the ground raw material is de-acidified in a calcinator and subsequently burnt in a kiln and before being de-acidified in the calcinator is preheated by a multistage heat exchange with exhaust gas streams coming from the kiln and from the calcinator, respectively, and conducted in two parallel series of heat exchange stages. Up to the heat exchange stage which directly precedes the calcinator and receives the exhaust gas stream from the kiln, the stream of ground raw material is conducted from each heat exchange stage of one series to a heat exchange stage of the other series. In order to provide equal conditions in both series of exhaust gas-handling heat exchange stages, part of the hot exhaust gas stream from the calcinator is admixed to the hot exhaust gas stream from the kiln before or adjacent to that heat exchange stage which directly precedes the calcinator.