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Method and apparatus for maximizing throughput of indirectly heated rotary kilns

United States Patent

October 30, 2012
View the Complete Patent at the US Patent & Trademark Office
An apparatus and method for achieving improved throughput capacity of indirectly heated rotary kilns used to produce pyrolysis products such as shale oils or coal oils that are susceptible to decomposition by high kiln wall temperatures is disclosed. High throughput is achieved by firing the kiln such that optimum wall temperatures are maintained beginning at the point where the materials enter the heating section of the kiln and extending to the point where the materials leave the heated section. Multiple high velocity burners are arranged such that combustion products directly impact on the area of the kiln wall covered internally by the solid material being heated. Firing rates for the burners are controlled to maintain optimum wall temperatures.
Coates; Ralph L. (Salt Lake City, UT), Smoot; L. Douglas (Provo, UT), Hatfield; Kent E. (Salt Lake City, UT)
Coates Engineering, LLC (Salt Lake City, UT)
12/ 470,423
May 21, 2009
CONTRACTUAL ORIGIN OF THE INVENTION This invention was made with U.S. Government support under Contract No. FR-FG02-08ER84951 awarded by the Department of Energy. The government has certain rights in the invention.