| 摘要 |
<p>A method for heating powder material comprising the steps of allowing hot gas from a plurality of hot gas sources separate from each other to flow separately through a plurality of hot gas passages which include a plurality of dust collectors and ducts for connection between said dust collectors, separately charging raw material to be heated through the each duct leading to the dust collector located in the uppermost part of said respective hot gas passages, then uniting the charged powder material, then alternately wandering the united powder material from one hot gas passage to the other hot gas passage, thereby the united powder material is heated by heat exchanging with the respective hot gas streams, and finally discharging the heated powder material through the duct located below the lowermost dust collector. An apparatus is provided for carrying out the aforesaid method comprising a plurality of hot gas passages through which hot gas streams coming from a plurality of hot gas sources separate from each other flow, said hot gas passages consisting of dust collectors and ducts for connection between said dust collectors, raw material ducts for connection of the dust collector disposed in one of the hot gas passages to the duct disposed in the other one, and raw material feeders arranged for the respective hot gas passages.</p> |
