Separation of heat carrier from fluidized bed

Claim 1

A PROCESS OF SEPARATING COARSE CARRIER PARTICLES WHICH FALL DISPERSED THROUGH A BED OF FLUIDIZED FINE PARTICLES WHICH COMPRISES INTRODUCING THE CARRIER AT THE TOP OF THE BED OF FLUIDIZED FINES SO THAT THE CARRIER FALLS DISPERSED DOWNWARDLY THROUGH THE FINES IN A RISING GAS STREAM WHICH FLUIDIZES THE FINES, SAID CARRIER PARTICLES HAVING A PARTICLE SIZE OF ABOUT 2-8 TIMES THAT OF THE COARSEST 10 WEIGHT PERCENT OF FINES IN SAID BED, ACCUMULATING THE CARRIER IN A DOWNWARDLY MOVING BED CONSISTING ESENTHE FLUIDIZED FINES BED, SAID MOVING BED CONSISTING ESSENTIALLY OF A MOVING BED OF CARRIER PARTICLES WHEREIN SAID PARTICLES VIBRATE BUT RETAIN THEIR AVERAGE POSITION RELATIVE TO NEIGHBOURING CARRIER PARTICLES, WHEREIN, THE MOVING BED OF CARRIER PARTICLES HAVE A STEADY NON-SURGING TOP LEVEL INTERFACE WITH THE BOTTOM PART OF THE FLUIDIZED FINES BED AND BACK MIXING AND TURBULENT FLOW IN THE MOVING BED IS AVOIDED, PASSING GAS UP THROUGH THE DOWNWARDLY MOVING BED OF CARRIER UNIFORMLY DISTRIBUTED AS THE GAS PASSES THROUGH SAID INTERFACE, MAINTAINING THE GAS VELOCITY THROUGH THE INTERFACE SUBSTANTIALLY AT BUT BELOW THE CRITICAL MASS VELOCITY OF THE GAS FOR THE CAR-