Designing Recuperator on a Rotary Kiln Supplied with Enriched Air During the Calcination of Dolomite

Abstract

The paper analyzes the possibility of using a recuperator on a rotary kiln in the case where the heat for calcination of dolomite is obtained by the combustion of heavy fuel oil (HFO) with enriched air. The combustion air is enriched with oxygen up to 23%. The recuperator uses both the convective and radiant heat loss from the mantle, prevents overheating and could be implemented over rotary kilns with similar surface temperature distribution. A mathematical model that determines the diameter of the recuperator is developed and presented. The use of the suggested recuperator is impossible when air enriched with oxygen over 23% is used for the combustion of HFO in the kiln. It is necessary to consider other possibilities for the use of waste heat from the mantle of a rotary kiln.