| 摘要 |
In the production of alumina from aluminium hydroxide, the aluminium hydroxide is calcined in a fluidized-bed reactor upon preheating in at least one preheating stage and is then supplied to at least one fluidized-bed cooler, in which the calcined solids are cooled by means of fluidizing air, wherein the fluidizing air is withdrawn from the cooler and introduced into the fluidized-bed reactor as secondary air. In order to minimize the specific energy consumption in partial-load operation of the plant, the secondary air stream is divided and a bypass stream is guided past the fluidized-bed reactor and introduced into a delivery conduit for the solids. |
