| 摘要 |
The invention relates to a method and a device for handling pulverulent fluidised-bed material enabling the clogging of the porous fluidisation wall (4, 19, 21) by non-fluidisable substances mixed with the pulverulent material to be detected and prevented. It consists in dividing the porous wall into two parts: the first part (19), placed under the feed column (15), is located at a horizontal level below that of the second part (21) which is placed under the balancing column (16); each of these parts is fed by two independent volumes (18, 20) and the fluidisation pressure difference in each of these two volumes is measured. This difference increases as a function of the clogging of the porous wall (19) placed under the feed column and enables this wall to be unclogged when the difference exceeds a set value. The invention is applicable to the fluidised-bed transportation of any product: alumina, lime, cement, metal and plastic powder, foodstuffs, etc. <IMAGE> |
