| 摘要 |
<p>1,171,568. Planetary coolers for rotary kilns. F. L. SMIDTH & CO. A.S. 15 May, 1968 [15 May, 1967], No. 23081/68. Heading F4B. [Also in Division C1] Cement clinker, calcined in a rotary kiln, is sprayed with a reducing agent from a nozzle 13 and then falls through one of the shoots 15 into one of the eight cooling tubes 16 arranged in planetary fashion around the kiln. A partition 17 divides each tube into two sections. The hot clinker is cooled, e.g. from 1150‹ to 650‹ C., in the first section 18 by indirect heat exchange with air passing through the cooling tubes 20 and is then passed through the spiral duct 23 into the second section 19 in which it is further cooled by direct heat exchange with cooling air. The cooling air enters the direct cooling section 19, passes into the tubes of the indirect cooling section 18, and then passes into the kiln as secondary air for the combustion of the fuel/ air mixture from the burner 12.</p> |
