Batch asphalt plant having RAP weigh hopper and pugmill scavengi

Details Batch asphalt plant having RAP weigh hopper and pugmill scavengi Batch asphalt plant having RAP weigh hopper and pugmill scavengi

1993-12-07

1995-06-13

Jenkins, Robert W.

Agitating

Mortar mixer type

Methods

366 18, 366 23, 366 33, B28C 546, B28C 538

Patent

active

054236061

ABSTRACT:
A designated amount of recycled asphalt product (RAP) is fed to the pugmill of a batch asphalt plant during the production of hot mix asphalt (HMA) at a controlled rate so as not to overload the pugmill scavenging system. The designated amount of RAP is metered in a RAP weigh hopper, stored temporarily in a RAP holding hopper, and is then fed from the RAP holding hopper to the pugmill at a controlled rate. The feed of RAP to the pugmill, though electronically initiated, is preferably manually or automatically adjustable so as to avoid overloading the pugmill scavenging system while at the same time assuring adequate mixing of the RAP with the virgin aggregate and liquid asphalt. The scavenging system directs vapors removed from the pugmill to the dryer and preferably includes electronically operated dampers connecting the combustion air inlet of the dryer to the pugmill only during the mixing operation and otherwise connecting the combustion air inlet to the ambient atmosphere.

REFERENCES:
patent: 2967696 (1961-01-01), Mauldin
patent: 3484083 (1969-12-01), Albertini
patent: 3661365 (1972-05-01), Cloud, Jr.
patent: 3949907 (1976-04-01), Mize
patent: 4579458 (1986-04-01), Ohlson
patent: 4943200 (1990-07-01), Edwards et al.
patent: 4944646 (1990-07-01), Edwards et al.
patent: 4993839 (1991-02-01), Brock
patent: 5090813 (1992-02-01), McFarland
patent: 5251976 (1993-10-01), Milstead
Astec Product Line--Batch Tower.
The Batch Tower, Feb. 1988.

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