The proposal of the recuperator design for the rotary kilns with a driving mechanism in the calcination zone

Abstract

The rotary kilns have been used in the industry in various applications, mostly in the cement industry and for calcination of dolomite ores. The rotary kilns characterize the high-temperature processes and therefore the heat losses are very high. In the order to increase the efficiency of the kiln and reduce fuel consumption, several different designs of recuperators are developed. One of the problems in the design of the recuperator is the position of the driving mechanism or tyre of the rotary kiln. This paper has presented a solution of the two separated recuperators in order to resolve the previous mentioned problems and increase the overall efficiency of the rotary kiln. The analytical model has been used for the determination of the geometry and heat losses of the recuperator while the CAD model has been used for the calculation of the heat losses and analysis of the airflow in the recuperator. The results obtained from both models have shown a good correlation and show that with the presented two-part recuperator design is possible to increase the efficiency of the rotary kiln when the driving mechanism or tyre is placed on the kiln shell in the calcination zone.