| 摘要 |
The dryer under consideration has a gas burner located within a sheet metal housing, and passageways in and through the housing direct ambient air for combustion with fuel within the housing and subsequent discharge of the combined combustion gases through the inlet opening into the drum chamber. The exhaust opening from the drum chamber is ducted to the outside atmosphere but it is also ducted at a tee junction to a reclaimer housing that directs this diverted gas in heat exchange relation past the burner housing and to the drum chamber. Thus, a portion of such exhausted gases is reused, preferrably the reused gas should constitute approximately 50 to 70 percent of the total volume of gas used, and it is heated only by heat exchange contact with the burner housing; while the remainder of the drying gases comprises the ambient air heated by combustion in the burner with the gaseous fuel and is thus much hotter. The orientation of the inlet openings to the drum chamber for the combustion and recycled gases provides that the hotter combustion gases be discharged on the upstream side of the cooler recycled gases, as referenced by the direction of rotation of the dryer drum and its tangential effect pass the inlet openings; and these openings are immediately adjacent one another.
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