Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Patent
1992-11-25
1995-08-15
Bennet, Henry A.
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
34499, F26B 904
Patent
active
054408253
ABSTRACT:
A horizontal dryer for solid material is the subject of the present invention. The dryer consists of a horizontal drum rotated about its horizontal axis, containing flighting around its periphery, and coupled with a heat source, all of which is well known in the prior art. The dryer of the present invention, however, both receives and discharges material at only one end and provides an inner tubular member, centrally mounted coaxially in the drum which member presents a preheating chamber. Material to be dried is first fed into the inner tubular member at one end of the drum and is moved through the tubular member by a plurality of curved flights thus preheating the material in preparation for drying. The material is moved through the preheating chamber to the opposite closed end of the drum where it is deposited into the primary drying chamber of the drum. Flighting in the drum moves the material back toward the inlet end of the drum as it continues to be heated and dried. The dried material passes out of the drum at the same end where it entered and into a hopper where it is moved by a conveyor. A hot gas stream, which flows counter-current to the first direction of travel of the material being dried, is directed to the open end that presents both the inlet and the outlet, from the opposite end, once the material being dried is dumped into the main drying chamber it, of course, travels a path that is concurrent with the flow of the drying stream of hot gases. An alternative embodiment of the invention provides a plurality of inner tubular members, each of which is provided with a plurality of internal curved flights. The material to be dried is passed through a first tubular member and into an adjacent tubular member by means of scoops such as described above. When the material has passed through each inner tubular member, it is then deposited into the primary drying chamber of the drum and continues as described for the preferred embodiment.
REFERENCES:
patent: 2851792 (1958-09-01), Steimel et al.
patent: 2887788 (1959-05-01), Baxter et al.
patent: 4262429 (1981-04-01), Avril
patent: 4338732 (1982-07-01), Coxhill
patent: 4742622 (1988-05-01), Thompson
patent: 4813154 (1989-03-01), Ronning
Thompson Stanley P.
Zimmerman Kenneth J.
Beloit Technologies Inc.
Bennet Henry A.
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