Apparatus and process for removing volatile coatings from scrap

Details Apparatus and process for removing volatile coatings from scrap Apparatus and process for removing volatile coatings from scrap

1989-09-01

1991-10-22

Yuen, Henry C.

Heating

With means diluting, purifying or burning exhaust gases

432 13, 432106, 266901, F27B 702

Patent

active

050591169

ABSTRACT:
Both aluminum scrap covered with a volatile coating and a heated airstream having a low oxygen content pass through a kiln where the airstream causes the coating to volatilize. The temperature of the airstream, where it enters the kiln, is maintained essentially constant, slightly below the melting temperature of the aluminum, and likewise the temperature of the airstream is maintained essentially constant where the airstream leaves the kiln, this being achieved by varying the mass flow of the airstream to compensate for variances in the nature and mass of the aluminum scrap within the kiln. Beyond the kiln the airstream enters an afterburner where it is heated in the presence of sufficient oxygen to effect combustion of the volatile components of the coating. The airstream then passes through a heat exchanger and back to the kiln. The mass flow within the kiln is controlled by diverting some of the airstream upstream from the heat exchanger or by varying the speed of the fan which creates the airstream.

REFERENCES:
patent: 2743529 (1956-05-01), Hayes
patent: 3437321 (1969-04-01), Wilkenson
patent: 3627289 (1971-12-01), Erman
patent: 3947235 (1976-03-01), Bornert
patent: 4331086 (1982-05-01), Fitch et al.
patent: 4411695 (1983-10-01), Twyman
patent: 4548651 (1985-10-01), Ramsey
patent: 4681535 (1987-07-01), Kobari et al.
patent: 4789332 (1988-12-01), Ramsey et al.
Waste Heat Recovery in Aluminum Scrap Recyling, pp. 191-199.

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