Dryer drum coater having recirculation chamber for VOC/NOX reduc

Details Dryer drum coater having recirculation chamber for VOC/NOX reduc Dryer drum coater having recirculation chamber for VOC/NOX reduc

1994-03-07

1996-06-04

Gromada, Denise L.

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34131, 34141, 432106, 366 25, F26B 300

Patent

active

055221580

ABSTRACT:
A dryer drum coater has an internal recirculation cylinder for promoting the recirculation of combustion products so as to entrain and incinerate blue smoke formed when heated and dried virgin aggregate is mixed with other asphaltic products such as RAP and/or liquid asphalt in the dryer drum coater. The recirculation cylinder acts to extend and strengthen natural eddy currents formed during operation of the coater such that combustion product recirculation which would normally extend only in the end area of the flame extends far enough toward the base of the flame to entrain the blue smoke and to draw the blue smoke into the base area of the flame. The cylinder may comprise a refractory lined stainless steel shell or may be formed from tee flights of the type used in the combustion zones of dryer drum coaters.

REFERENCES:
patent: 3741166 (1973-06-01), Bailey
patent: 3787562 (1974-01-01), Heller et al.
patent: 4600379 (1986-07-01), Elliott
patent: 4725223 (1988-02-01), Coppin et al.
patent: 4867572 (1989-09-01), Brock et al.
patent: 4892411 (1990-01-01), Elliott et al.
patent: 5054931 (1991-10-01), Farnham et al.
patent: 5203693 (1993-04-01), Swanson
patent: 5261738 (1993-11-01), Brock
patent: 5388985 (1995-02-01), Musil et al.

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