| 摘要 |
<p>Heat and material exchange between a gas and a fine material Particularly designed for the preheating, roasting and cooling of the material, the apparatus features a pit through which the gas flows upwards in a spiral fashion. This causes the material to come into contact with the gas stream several times and to be thrown outwards. The exit direction of the separate guide surfaces defines an angle 70 degrees with the tangents positioned at the inner periphery of the pit.</p> |
