Method of increasing the clinker output of an existing cement plant and of producing steam

摘要

In a method of increasing the clinker output of an existing cement plant and of producing steam, a raw meal is preheated in a preheater (50), then burned in a rotary kiln (16) to form clinker, and the clinker is cooled in a clinker cooler (20). Calcined raw meal, consisting essentially of lime and combustion residues like ash, carbon and desulfurization residues is fed to the preheater (50). Process air from the clinker cooler (20) is directed to the preheater (50) in countercurrent flow to the direction of flow of the calcined raw meal. The calcined preheated raw meal is directed to the rotary kiln (16). The kiln exhaust gases are 100 % bypassed and used for steam production in a boiler (60). The kiln exhaust gases are quenched to a temperature of about 800-900 DEG C prior to their heat exchange in the water/steam cycle.