Furnaces – Utilizing powdered fuel – Having rotary flow means
Patent
1985-04-01
1987-01-27
Yuen, Henry C.
Furnaces
Utilizing powdered fuel
Having rotary flow means
366 12, 366 25, 110265, 110216, 110101CC, 110246, F23C 110, B28C 506, F23D 1700
Patent
active
046387471
ABSTRACT:
The invention comprises a coal-fired burner system for use in a drum mix asphalt plant or drum dryer used for producing asphalt paving composition. Coal to fire the burner is ground to a -200 mesh size by an air-swept rotary impact mill, and a classifier at the exit from the mill controls the size of the particles leaving the mill. The pulverized coal particles are recovered from the exhaust airflow exiting the mill by a fiber filter collector and temporarily stored in a small surge bin. Coal is metered from the surge bin into a primary air conduit leading to the burner. The availability of a small but ready supply of coal in the surge bin provides quick response to a need for increased coal while avoiding the dangerous storage of large quantities of pulverized coal dust. As the weight of coal dust in the surge bin decreases, control circuitry provides for the processing of additional coal to maintain a ready supply of processed coal in the surge bin.
Use of a burner having swirl vanes to create a short cyclonic flame pattern permits the burner to be mounted directly in the upper end of the drum without the need for a separate combustion chamber, but without sending a long flame into the mixing area of the drum where liquid asphalt is introduced, which would cause a fire hazard and pollution problem.
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The Asphalt Handbook, The Asphalt Institute, July, 1962 Edition.
Excerpt from Chemical Engineering Handbook, 4th Edition by John H. Perry, published by McGraw-Hill.
Brock J. Donald
May James G.
Astec Industries Inc.
Yuen Henry C.
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