초록 ▼

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 e

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.

대표청구항 ▼

A dryer drum coater comprising: A. a rotary drum which heats and dries virgin aggregate, said rotary drum having an aggregate inlet, an aggregate outlet, and a combustion products outlet; B. means for defining a mixing chamber for mixing heated and dried virgin aggregate with other asphaltic product

A dryer drum coater comprising: A. a rotary drum which heats and dries virgin aggregate, said rotary drum having an aggregate inlet, an aggregate outlet, and a combustion products outlet; B. means for defining a mixing chamber for mixing heated and dried virgin aggregate with other asphaltic products, thereby producing blue smoke, wherein said mixing chamber includes a virgin aggregate inlet; and C. means for evacuating said blue smoke from a vapor outlet located adjacent said virgin aggregate inlet of said mixing chamber and remote from said combustion products outlet of said rotary drum.