Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1988-05-16
1991-02-05
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
432 59, F26B 1300
Patent
active
049893483
ABSTRACT:
The invention relates to a dryer, in particular offset dryer for material webs containing high-boiling solvents to be dried in a continuous flow. The heating-up of the dryer atmosphere with a burner takes place in a closed chamber arranged in the dryer casing. Circulating air is fed to the burner as combustion air. Further circulating air, containing solvent vapors, is mixed in with the flue gas of the burner in the chamber in order that the solvent is completely burned. The temperature-controlled hot gases of the after-burning are cooled by mixing in fresh air at the inlet slit and, if appropriate, outlet slit to such a low temperature before they pass into the dryer interior that cracking of the volatile solvents in the circulating air of the dryer cannot occur. The volatile solvents, which can be used as fuel, can be extracted from the exhaust air, which like the circulating air only contains volatile solvents as pollutants, by cooling.
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