| 摘要 |
<p>A kiln plant for treating material such as cement raw material comprises a kiln (1), a cooler (2), a precalciner (9) and a suspension preheater (15, 17, 19). A suspension of preheated material is introduced tangentially via a duct (11) into the top or bottom of a vertical tubular chamber of the precalciner (9) near to fuel/oxygen- containing gas inlets (7, 8) to generate a swirling movement of the suspension in the chamber in such a way that the major part of the suspension remains as a protective layer near to the wall of the tubular chamber without intimate mixing with the fuel/gas mixture, thus allowing the fuel to burn out in the oxygen-containing gas near to the axis of the chamber at a temperature above the calcination temperature of the raw material, whereupon precalcination of the material is carried out in the heated atmosphere in the remainder of the chamber. <IMAGE></p> |
