Dryer drum coater having vented outer shell for VOC/NOx reductio

Details Dryer drum coater having vented outer shell for VOC/NOx reductio Dryer drum coater having vented outer shell for VOC/NOx reductio

1994-03-07

1996-09-03

Gromada, Denise L.

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34131, 34137, 432106, F26B 300

Patent

active

055511660

ABSTRACT:
A dryer drum coater reduces blue smoke emissions by evacuating the blue smoke from the dryer drum coater independently of the exhaust of combustion products. The blue smoke, produced when heated and dried aggregate is mixed with other asphaltic products such as RAP or liquid asphalt, is preferably evacuated from a vapor outlet formed remote from the exhaust products outlet of the coater and adjacent the heated and dried aggregate inlet of the mixing chamber. Evacuating the blue smoke at this location obviates the need to separate the blue smoke from the combustion products and also prevents the introduction of excess oxygen into the combustion zone of the dryer drum coater. In a particularly preferred arrangement, the evacuated blue smoke is fed directly to the combustion air inlet of the coater's burner blower and is thereby incinerated.

REFERENCES:
patent: 2224544 (1940-12-01), Keller
patent: 4190370 (1980-02-01), Brock et al.
patent: 4279592 (1981-07-01), Grant
patent: 4298287 (1981-11-01), McCarter, III et al.
patent: 4600379 (1986-07-01), Elliott
patent: 4728282 (1988-03-01), May
patent: 4892411 (1990-01-01), Elliott et al.
patent: 4926765 (1990-05-01), Dreizler et al.
patent: 5261738 (1993-11-01), Brock

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