Heating – Tumbler-type rotary - drum furnace – Having combustion products generated in or fed to drum
Patent
1995-01-19
1998-03-24
Doerrler, William
Heating
Tumbler-type rotary - drum furnace
Having combustion products generated in or fed to drum
432 72, 34108, F27B 702
Patent
active
057305919
ABSTRACT:
A treatment system and method is disclosed for heat treating aggregate, for example, an aggregate dryer of the type which uses a burner and rotating drum for veiling aggregate into a thermal flow path. The invention provides a plurality of mixers which safely mix fuel and oxidant into a premix which is delivered to a reaction chamber The premix is combusted and recirculated within the reaction chamber to insure uniform and complete combustion, resulting in lower emissions of pollutants such as carbon monoxide, volatile organic compounds, and nitrogen oxides and also lower combustion roar. This uniform and complete combustion results in a more uniform thermal profile within the rotating drum, resulting a greater throughput of processed aggregate and a more efficient consumption of energy. The invention also includes a "tunability" feature for varying the delivery of fuel to the burner in order to avoid resonant vibration produced by a matching of the combustion frequencies with the natural frequency of the treatment system.
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Miller Todd A.
Quinn Dennis E.
Robertson Thomas F.
Doerrler William
North American Manufacturing Company
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