METHOD AND APPARATUS FOR HEAT TREATING WITH HEAT R

专利名称：METHOD AND APPARATUS FOR HEAT

TREATING WITH HEAT RECUPERATIONFROM MATERIAL COOLING AND AUXILIARYHEAT DURING STARTUP

发明人：CNARE R,US申请号：US3782888D申请日：19721004公开号：US3782888A公开日：19740101

摘要：A method and apparatus is disclosed for heat treating mineral ore materials.The apparatus includes, in material series flow arrangement, a traveling grate preheaterhaving at least one material drying zone and a preburn zone, a rotary kiln, and a cooler.The cooler has a first stage in which air becomes heated as the ore is cooled and thisheated air is conducted through the kiln and preburning zones counter to material flow.The cooler has a second stage in which air is heated and thermal energy recuperated asthe ore is further cooled and this second cooler stage air after being heated is conductedby a bypass conduit around the kiln and preburn zone to supply heat for drying thematerials. An auxiliary air heater is associated with this bypass and according to themethod disclosed, during start-up operation and before hot material arrives in thesecond stage of the cooler, the air heater is operated to heat the air conducted from thesecond stage of the cooler, for drying the material until hot material does arrive in thesecond stage of the cooler and thereafter heat transferred from the hot material to theair passing through the material in the second stage of the cooler, is utilized for drying

the material. The disclosed apparatus operated according to the disclosed method,achieves improved fuel economy, more effective control of the drying or dehydratingoperation, and such operation is achieved with a smaller kiln than heretofore requiredaccording to teachings of the prior art.

申请人：ALLIS CHALMERS CORP,US

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