Cement Technology

Polysius rotary kiln. Centre piece of the pyroprocessing system.

A company of ThyssenKrupp Technologies

Polysius

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Rotary kilns from Polysius: economical – reliable – resource-saving.

In 1899, Polysius put Europe’s first rotary kiln into operation. In those days, rotary kilns were a maximum of 2 m in diameter and 20 m in length, managing daily outputs of 30 to 50 tonnes of cement clinker per day. Nowadays, production capacities of 10,000 tonnes per day are nothing unusual. Today, the demands of the industry with regard to quality, maximum capacity and minimum costs have become the decisive factors for competitive strength. And that is why. . . x robust and reliable design, x low resource consumption, x high operating reliability and x low specific operating costs and capital expense are the most important elements in the success of Polysius kiln technology.

Since the introduction of the rotary kiln, Polysius has constructed more than 1,500 production lines worldwide. Polysius kiln lines are used in the cement and refractories industry, in the chemical industry, in the iron and steel producing industry and in the mineral processing industry. Due to optimisation of the overall pyroprocessing concept, modern rotary kilns have significantly smaller dimensions and thus require less capital investment than their predecessors, despite their higher output rates. The actually required kiln dimensions essentially depend on the raw materials and fuels to be used, the plant configuration, the quality of the cement clinker and on the desired production capacity. Taking these factors into account, the optimum kiln shell dimensions are accurately determined with the aid of laboratory test processes, computer simulations and design calculations. Thanks to the use of modern precalcination processes, rotary kilns nowadays seldom need a length to diameter ratio above 15:1. Up to this L / D ratio, Polysius offers both the classical 3support kiln and the modern...