Two stage drying with single auger

Details Two stage drying with single auger Two stage drying with single auger

F - Mech Eng,Light,Heat,Weapons

26

B

34/44

F26B 17/20 (2006.01)

Patent

CA 1049257

ABSTRACT OF THE DISCLOSURE A relatively low temperature, modestly sub-atmospheric pressure, double or more pass and controlled fall multiple zone technique for drying waste materials involves feeding the wet disintegral material through conveyance means with agitation and forwarding through at least two distinct and separate, yet inter- connected, drying zones wherein the material is sequentially subjected to the drying, action and influence of respectively lower inlet temperatured hot fluid or gas streams which are at least substantially uniformly passed through the material that each of said streams are drying in such a manner (resulting from appropriate adaptation of the bed-forming means containing the material in its passage through the assembly and due to the expanding, increasing cross-sectional area of the material con- tained and being treated for drying in the assembly) as to physically pass through the material being dried at a constantly reducing velocity of the gases. The outlet temperature of the gas in the last zone (from which the finally dried material is removed) is greater than that, in decreasing sequence, of that from the preceding zone(s) when the solid material being dried is below its critical moisture content which is, of course, when the moisture rate is limited by its diffusion within the material being dried. Otherwise, enough flow can be put into the system to cause desired temperature effects with heat trans- fer limitations then being the controlling factor.

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