| 摘要 |
1. A process for the treatment of granular solid materials in a fluidised bed wherein the solid materials are introduced into a fluidised bed reactor and subjected therein to treatment under the effect of gaseous agents under at least atmospheric pressure in a fluidised layer and at least a part of the solid materials is taken out of the fluidised bed reactor with the gaseous agents and at least partially separated off in a separator and returned into the fluidised bed reactor by way of a recycling means connecting the separator to the fluidised bed reactor, wherein the solid material which is separated off is collected within the recycling means which is provided with a connecting conduit for recycling of the solid material which is separated off, in a solid material bed which in turn is at least partially fluidised under the effect of gaseous agents, and wherein moreover within the overall apparatus including the fluidised bed reactor, the separator and the recycling means there is a pressure drop such that the pressure within the separator is lower than the pressure in the region of the fluidised bed reactor in which the solid material which is separated off in the separator and recycled passes back into the fluidised bed reactor, characterised in that the pressure in the recycling means between the separator and the upper boundary of the solid material bed which is formed in the recycling means is reduced by gas suction removal which is effected at a spatial spacing from the separator, to a level which is equal to the lowest pressure in the separator or which is lower than said pressure. |
