| 摘要 |
A sludge drying apparatus (10) including a housing through which air is recirculated wherein makeup air forms an air curtain assuring recirculation of heated air. The housing (12) includes a receiving station (14) in which sludge (20) is deposited on a conveyor belt (18). The conveyor belt (18) moves the sludge (20) to a drying station (16) where infrared heaters (42) radiate infrared heat on the sludge. Air for drying the sludge circulates from a fan plenum (28) to an air supply plenum (24). Air from the air supply plenum (24) passes across the face of the infrared heaters (42), and is directed downwardly toward the sludge (20) in a belt passageway (30). Air is returned through a return air plenum (26) located below the belt passageway (30). Part of the air received by the return air plenum (26) is ported directly from the belt passageway (30) to the return air plenum (26). Additional air is received in the return air plenum (26) through first and second return air ducts (36) and (38) located at the entrance opening (32) of the belt passageway (30) and the exit opening (34) of the belt passageway (30). Ambient air flows into the first and second return air ducts (36) and (38) as well as the air received through the entrance and exit openings (32) and (34) of the belt passageway (30). Ambient air received in the return air ducts forms an air curtain effectively sealing the ends of the belt passageway (30).
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