Rotary drum dryer having aggregate cooled shielding flights and

Details Rotary drum dryer having aggregate cooled shielding flights and Rotary drum dryer having aggregate cooled shielding flights and

1994-05-09

1996-01-02

Cooley, Charles E.

Agitating

Mortar mixer type

Methods

366 25, 366228, 34137, 432116, 432118, B28C 546, F27B 716, F27B 738

Patent

active

054802261

ABSTRACT:
A rotary drum dryer has devices for cooling shielding flights located in the combustion zone of the drum. The devices comprise cooling flights which rotate with the drum to scoop up relatively small amounts of virgin aggregate from aggregate accumulated in the lower portion of the drum and to shower this aggregate over the outer radial surface of the shielding flights upon further rotation of the drum, thereby cooling the shielding flights without substantially decreasing the mean temperature of the aggregate. Cooling efficiency is enhanced by the continuous cascading of fresh aggregate over the shielding flights from the cooling flights through a substantial portion of the drum's rotation. The cooling flights and shielding flights preferably cooperate to limit or even prevent the showering of materials into the burner flame and thus inhibit burner flame quenching and accompanying emissions. Particularly preferred cooling flights take the form of auxiliary flights which can be easily adapted to existing shielding flight designs.

REFERENCES:
patent: 856770 (1907-06-01), Cummer
patent: 876440 (1908-01-01), Cummer
patent: 888475 (1908-05-01), Cummer
patent: 1061762 (1913-05-01), Lierfeld
patent: 1196376 (1916-08-01), Meyer
patent: 4189300 (1980-02-01), Butler
patent: 4193208 (1980-03-01), Ronning
patent: 4318620 (1982-03-01), Malipier et al.
patent: 4338732 (1982-07-01), Coxhill
patent: 4422848 (1983-12-01), Musil
patent: 4867572 (1989-09-01), Brock et al.
patent: 5052810 (1991-10-01), Brock
patent: 5203693 (1993-04-01), Swanson

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