Drive system for World's most powerful cement mill

28 May 2013

The Siemens Drive Technologies Division has developed a new drive system for a cement mill as part of a joint project with Gebr. Pfeiffer SE.

Producing 450 metric tons of cement every hour, the vertical mill is the most powerful of its kind in the world today. It will be operated by the Brazilian cement producer Holcim, which will commission the plant as part of a project to expand the capacity of its existing works.

The multi-drive solution supplied by Siemens meets the demands of the cement industry for more availability, reliability and performance power. The modular and redundant drive system consists of six identical 1920 kW drive modules that drive the grinding table of the cement mill.

Siemens is also supplying all components of the drive train: gear unit, coupling and oil supply system, as well as electric motors and frequency converters. Because the drive units are mounted on carriages, they can be replaced quickly whenever maintenance is required, ensuring the fastest possible resumption of mill operation.

The radial arrangement of the drive units around the grinding table bearings protects the drives against grinding forces. The frequency converter allows variable speed adjustment and thus flexible adaptation of the milling process to suit the requirements of different input materials. This makes it possible to optimise, for example, throughput or energy efficiency. With this system configuration, even higher-output drive modules can be installed for an overall power rating of up to 16,500 kW. Up till now, the mechanical engineering limit attainable by conventional plants was 8000 kW.

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