A new theory for a rotary-kiln heat exchanger

A Mathematical Model of Heat Transfer in a Rotary Kiln Thermo‐Reactor

“…Previously, Imber and Paschkis gave a simplified analytical solution for the axial temperatures of the wall, bed, and freeboard gas in a one-dimensional rotary kiln heat exchanger [26]. This analytical solution has been used to calculate the heat balance in the design of rotary kilns, e.g., Kiang and Metry used it in the design of a hazardous waste incinerator [27].…”

Simulation of Heat-Transfer Phenomena in a Rotary Kiln

“…For the solids, this assumption is equivalent to stating that the material is well mixed. Imber and Paschkis (1962) have shown that this assumption is more accurate than assuming that the solids are not well mixed and that a temperature gradient exists in the charge at a given cross section.…”

“…• -'(' -ss>) predicting the rate of heat transfer between the kiln wall and the feed. Therefore, a rough approximation has been used, proposed by Imber and Paschkis (1962). They found that when radiative heat transfer was excluded, h% was approximately five times hi.…”

Simulation of Heat Transfer Phenomena in a Rotary Kiln

“…Eckert and Drake (1959) give an equation which accounts for these factors. Using the author's notation, fEs should be replaced by the expression /Lead Di -1 C. For the wall-to-solid convection coefficient, the handbook expression 0.05 G0•67 is multiplied by a factor of 5, as "proposed by Imber and Paschkis" (1962). Actually, they fpund that computations "based upon data for two rotary kilns" indicated that the wall-to-solid boundary conductance is approximately five times that for the gas-to-wall coefficient, and suggest that "this should be used only as a rule of thumb."…”