Drum mix asphalt plant with knock-out box and separate pugmill c

Details Drum mix asphalt plant with knock-out box and separate pugmill c Drum mix asphalt plant with knock-out box and separate pugmill c

1986-08-18

1987-12-29

Simone, Timothy F.

Agitating

Mortar mixer type

With heating or drying

366 22, 366 40, B28C 546

Patent

active

047157208

ABSTRACT:
Asphalt plant apparatus comprising a drum dryer, a collection chamber or "knock-out box," a "baghouse," and a separate pugmill coater disposed directly underneath the collection chamber so that dust particles which settle out of the airstream in the collection chamber fall directly into the pugmill coater. The apparatus solves the problem of light-end hydrocarbon pollutants which can be stripped from liquid asphalt by contact with steam, in that the liquid asphalt is introduced not into the drum dryer but into the separate pugmill coater instead. Since no liquid asphalt is present in the drum dryer to coat and control the aggregate dust, the exhaust air from the dryer is more heavily dust-laden than that from a conventional drum mixer. However, the apparatus utilizes a collection chamber to compensate for the additional dust in the exhaust air by recovering part of that dust and dropping it directly into the pugmill coater, where it is mixed with the aggregate and liquid asphalt.

REFERENCES:
patent: 2028745 (1936-01-01), Hendrick et al.
patent: 2146405 (1939-02-01), Overman
patent: 3809373 (1974-05-01), Brock
patent: 4211490 (1980-07-01), Brock et al.
patent: 4298287 (1981-11-01), McCarter, III et al.
patent: 4616934 (1986-10-01), Brock

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