A new theory for a rotary-kiln heat exchanger

Abstract

From theoretical considerations, two limits for the length required to achieve a prescribed temperature rise in rotary kilns are established. The "well-mixed" condition represents the lower limit (minimum length), while the "non-mixed" condition represents the upper limit (maximum length). The actual kiln length lies between these two limits. Procedures for the calculation of both limits are presented in the paper. Results from the "well-mixed" theory agree remarkably well with published data for an existing kiln. © 1962.