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CO-CURRENT ROTARY DRYER Many Louisville direct heat dryers are provided in co-current orientation. With the co-current or parallel flow dryer, wet material is introduced into the drum on the same end that the hot gas enters the dryer. Conversely, dry material discharges on the same end of the dryer as the exhaust vapor. The co-current dryer offers two advantages: •The wettest material comes in contact with the hottest gas as they enter the dryer. This results in a rapid evaporation and rapid cooling of the hot process gas. This typically allows the dryer shell to operate slightly cooler than the counter-flow configuration, which extends the life cycle and decreases maintenance of the dryer. •Since the dry product and vapor exit the dryer on the same end, a correlation exists between the exhaust gas temperature and the condition of the dried product. The LDC burner management system responds to the exhaust gas temperature which insures instantaneous heat load adjustment to varying conditions upstream of the dryer.
COUNTER-CURRENT ROTARY DRYER Louisville direct heat dryers are provided in counter-current dryer orientation when the application is warranted. With the counter-current or counter flow dryer, wet material is introduced into the drum on the opposite end that the hot gas enters the dryer and dry material discharges on the opposite end of the dryer as the exhaust vapor. The counter-current dryer is usually considered for processes such as: •The material is going to be heated in addition to drying. In some aggregate and ore processing applications, it is desired that the material be heated. In those applications, material enters the cold end of the drum and travels towards the hot end. Since the exhaust vapor exits opposite the material, there is no relationship between the temperatures. The product temperature can be hundreds of degrees hotter than the exhaust vapor providing lower stack loss and greater thermal efficiency. •Material has internal moisture. Some materials contain a high percentage of internal moisture. These materials require sufficient time for the water to migrate to the surface of the particle for evaporation.
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Louisville Dryer Company | 1100 Industrial Blvd | Louisville, KY 40219 Toll Free: (800)795-3165 Fax: (502) 969-9028