Rotary drum dryer with improved premixing assembly

Details Rotary drum dryer with improved premixing assembly Rotary drum dryer with improved premixing assembly

1989-08-23

1990-08-07

Yuen, Henry C.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34129, 34136, 432118, F26B 310

Patent

active

049456571

ABSTRACT:
An improved multiple-pass drum dryer (12) is provided which includes an enlarged, flighted premixing zone (65) including a frustoconical, converging transition section (68) leading to an innermost passageway (138) of a concentric multiple-pass final drying section (24). Product and drying air fed to the premixing zone (65) undergo an acceleration in the transition section (68), whereupon product and air are decelerated during travel through the multiple-pass final drying section (24). In this way, product is moved along a first region (66) of the premixing zone (65) at a relatively low average speed so that the initially wet product is proximally exposed to heated gases emitted from a burner for a maximally effective time period. The product then experiences a relatively rapid acceleration in the transition section (68) due to negative pressure from a downstream fan and decreasing cross-sectional area in the transition section (68). In preferred embodiments ambient-air injecting ports (154) are provided for propelling the product along the final pass in the outermost passageway (148) of the final drying section (24).

REFERENCES:
patent: 4338732 (1982-07-01), Coxhill
patent: 4427376 (1984-01-01), Etnyre et al.
patent: 4729176 (1988-03-01), Shinn et al.

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