| 摘要 |
<p>In the present method of drying iron ore pellets, e.g., magnetite pellet s, moisture-containing iron ore pellets are formed into a bed comprising a multiplicity of the pellets. A current of drying gas is forced upwardly through the bed of pellets to at least partially dry some of the pellets with air jets simultaneously directi ng air downwardly onto the top surface of the bed. Radiant heat reflectors are placed above th e bed to reflect heat back onto the pellets. Air is forced between the reflectors and onto the bed, especially below a firebrick wall located between the end of the updraft drying zone and the downdraft drying zone. Water is applied to the hot pelle ts to produce steam as well as water vapor which is added to a current of air to produce a stream of hot, humid air that is passed through the bed to improve pellet characteristics and recover waste heat. Air supplied at a selected point is cut off responsive to the presence of a blow hole in the bed so as to improve drying efficiency and improve uniformity of drying.</p> |
