Prevention of coking reactor cyclone dipleg plugging

Claim 1

IN A HEAVY HYDROCARBON OIL FLUID COKING PROCESS WHEREIN HEAVY HYDROCARBON OIL IS SEPARATELY INJECTED INTO A DENSE FLUIDIZED TURBULENT BED OF HIGH TEMPERATURE COKE PARTICLES IN A COKING ZONE AND COKE PARTICLES ARE CONTINUOUSLY WITHDRAWN AND AT LEAST PARTIALLY BURNED IN AN EXTERNAL BURNING ZONE AND THE COKE PARTICLES HEATED TO A TEMPERATURE OF ABOUT 100*F. TO 200*F. HIGHER THAN THE COKE PARTICLES IN SAID TURBULENT FLUID COKING BED ARE CONTINUOUSLY RECYCLED TO SAID COKING ZONE TO MAINTAIN A COKING TEMPERATURE IN SAID FLUIDIZED TURBULENT BED THEREIN AND GASEOUS PRODUCTS ARE PASSED OVERHEAD THROUGH A GAS-SOLIDS SEPARATION ZONE TO REMOVE ENTRAINED SOLIDS FROM SAID GASEOUS PRODUCTS AND THE SEPARATED SOLIDS ARE RETURNED TO SAID DENSE FLUIDIZED TURBULENT BED AS A GENERALLY DOWNWARDLY MOVING CONFINED COLUMN MAINTAINED IN A FLUID CONDITION AND COKING AND PLUGGING AND PARTIAL STOPPAGE OF THE MOVING CONFINED COLUMN MAY OCCUR DUE TO HYDROCARBON-WET SOLIDS THEREIN, THE IMPROVEMENT WHICH CONSISTS IN ADMIXING HEATED COKE PARTICLES CONSISTING ESSENTIALLY OF AT LEAST PART OF THE HEATED COKE PARTICLES BEING RECYCLED TO SAID COKING ZONE WITH SAID MOVING CONFINED COLUMN BEFORE THE HEATED COKE PARTICLES BEING RECYCLED ARE DISCHARGED INTO SAID COKING ZONE TO HEAT THE COKE PARTICLES IN SAID MOVING CONFINED COLUMN TO A DRYING TEMPERATURE TO AVOID COKING OF THE PARTICLES IN SAID MOVING CONFINED COLUMN AND TO MAINTAIN STEADILY FLOWING HEATED COKE PARTICLES BEING RECYCLED TO SAID COKING ZONE AND SO PREVENTING BACK SURGING FROM SAID TURBULENT FLUID COKING BED TO SAID MOVING CONFINED COLUMN AND USING THE HEATED COKE PARTICLES BEING RECYCLED IN AN AMOUNT OF ABOUT 5 TO 10 TIMES GREATER THAN THE AMOUNT OF COKE PARTICLES BEING RETURNED TO SAID FLUID COKING BED AS SAID MOVING CONFINED COLUMN FROM SAID GAS-SOLIDS SEPARATION ZONE.