Process and apparatus for heat exchange of solid particles for double regeneration in catalytic cracking.

摘要

The catalyst and a proportion of the regeneration fumes are abstracted in the dense catalyst bed of a second regenerator (9) and introduced by gravity into an external exchanger (21) at a connecting point below the level of the dense bed in the second regenerator. The heat exchange takes place in the lower part of the exchanger below the connecting point. From the lower end of the exchanger as far as above the connecting point a dense bed region is produced, the level of which is established substantially at the height of that of the dense bed in the regenerator, and a disengagement zone (27) for the regeneration gases and fluidising gas, of appropriate volume, is produced. The gases and fumes from the exchanger are removed in the dilute fluidised phase of the second regenerator via a conduit (28) while the catalyst is recycled into the bed of the first regenerator via a conduit (34). Application to the regeneration of fluid-bed cracking catalysts. <IMAGE>