| 摘要 |
<p>A plurality of material cooling tubes are attached in parallel alignment around the periphery of the material discharge end of a rotary kiln. An oblique passage is provided from each tube to the interior of the kiln for conducting air from the tube to the kiln. A first duct is provided for receiving hot material from the kiln. The first duct is within the oblique passage and extends from the kiln a predetermined distance to a terminal portion thereof intermediate the kiln and tube. A second duct is provided which has a first end portion connected to the terminal portion of the first duct and the second duct projects out of the oblique passage to be exposed to surrounding atmosphere. The second duct has a second end portion connected to the tube. The second duct is a spiral that turns away from the adjacent end of at least about 180 DEG to where it discharges material into the tube and the tube projects through the space inwardly of the spiral duct toward the adjacent discharge end of the kiln. The spiral duct, being exposed to atmosphere, is cooled and material therein is cooled, to reduce thermal stress in the assembly.</p> |
