B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/26 (2006.01) B01D 53/44 (2006.01) B01D 53/62 (2006.01) F26B 21/00 (2006.01) F26B 25/00 (2006.01)
Patent
CA 2627384
A method and apparatus are provided for reducing the VOC and CO content of dryer offgas that is discharged into the atmosphere from a moist organic product drying process using thermal oxidizing apparatus that includes a furnace, mixing chamber, thermal oxidizer, tempering chamber, and an indirect gas-to-gas heat exchanger. The dryer offgas is separated into two portions, with a larger portion being preheated by indirect heat exchange with the hot gaseous output from the thermal oxidizer. The non-preheated portion is directed to a rotary waste heat evaporator in which moisture is removed therefrom. The preheated portion is recycled to the hot gas inlet of the dryer and serves the function of dryer heat transfer media. By removing moisture from the non-preheated portion of the offgas that is directed to the thermal oxidizing apparatus, simultaneous achievement of thermal oxidizer temperatures of1600°F or greater, and an adequate oxygen concentration of 5% by volume is achieved for optimized thermal oxidation of carbon monoxide and volatile organic compounds.
Gowling Lafleur Henderson Llp
Ronning Richard L.
Ronning Engineering Company Inc.
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