The present work reports a computer simulation and optimization study of heat transfer in a rotary kiln used for drying and preheating of wood chips with superheated steam at 1 bar. A rotary kiln employed for drying and preheating of wet solids consists of a refractory lined cylindrical shell mounted at a slight incline from the horizontal plane. The kiln is very slowly rotated about its longitudinal axis. Wet solids are fed into the upper end of the cylinder and during the process, are dried and heated by the countercurrent flow of the hot gas. Finally, it is transferred to the lower end where it reaches the desired temperature and discharged. The heat transfer model includes radiation exchange among hot gas, refractory wall and the solid surface, transient conduction in the refractory wall, and mass and energy balances of the hot gas and the solids. A finite-difference based computational heat transfer approach is used. A Univariate Search method has been used to obtain minimum kiln length with respect to various kiln operating parameters subject to a constraint on the inlet gas temperature. The parametric study lent a good insight into the physics of the drying process in a rotary kiln. The optimization study reveals that for an economical design of a rotary kiln low rotational speed, small inclination angle and medium gas flow rate is required.
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ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
August 10–14, 2008
Jacksonville, Florida, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4848-7
PROCEEDINGS PAPER
Simulation and Optimization of Drying of Wood Chips With Superheated Steam in a Rotary Kiln Available to Purchase
P. S. Ghoshdastidar,
P. S. Ghoshdastidar
Indian Institute of Technology-Kanpur, Kanpur, UP, India
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Ankit Agarwal
Ankit Agarwal
Indian Institute of Technology-Kanpur, Kanpur, UP, India
Search for other works by this author on:
P. S. Ghoshdastidar
Indian Institute of Technology-Kanpur, Kanpur, UP, India
Ankit Agarwal
Indian Institute of Technology-Kanpur, Kanpur, UP, India
Paper No:
HT2008-56258, pp. 105-114; 10 pages
Published Online:
July 7, 2009
Citation
Ghoshdastidar, PS, & Agarwal, A. "Simulation and Optimization of Drying of Wood Chips With Superheated Steam in a Rotary Kiln." Proceedings of the ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. Heat Transfer: Volume 2. Jacksonville, Florida, USA. August 10–14, 2008. pp. 105-114. ASME. https://doi.org/10.1115/HT2008-56258
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