Refractory lining for vessels

Claim 1

A VESSEL ADAPTED TO CONTAIN THEREIN A MASS OF HOT POWDERED SOLIDS AT TEMPERATURES BETWEEN 600*F. AND 1500*F., THROUGH WHICH A FLUIDIZING GAS IS ADAPTED TO BE PASSED AT SUFFICIENT VELOCITY TO MAINTAIN SAID SOLIDS IN A FLUIDIZED CONDITION IN A LOWER DENSE PHASE AND AN UPPER DILUTE PHASE SEPARATED BY AN INTERFACE REGION, SAID VESSEL COMPRISING A WALL DEFINING METAL SHELL, A PLURALITY OF METAL STUD MEMBERS SPACED APART OVER SUBSTANTIALLY THE WHOLE INNER SURFACE OF SAID SHELL, SAID STUD MEMBERS WELDED TO THE INNER SURFACE OF SAID SHELL AND PROJECTING INWARDLY THEREOF, A METAL GRID STRUCTURE FORMED OF A PLURALITY OF SEPARATE PANELS WELDED TO THE EXTENDING ENDS OF SAID STUDS, AN INSULATING REFRACTORY LINING COVERING THE SURFACE OF SAID METAL SHELL AND ENVELOPING SAID METAL STUD MEMBERS AND SAID METAL GRID STUCTURE, SAID LINING INCLUDING A MONOLITHIC LAYER OF INSULATING REFRACTORY CONCRETE ADJACENT THE INNER SURFACE OF SAID METAL SHELL CONTAINING A SUBSTANTIAL PORTION OF LIGHT WEIGHT, POROUS, REFRACTORY AGGREGATE, SAID MONOLITHIC LAYER HAVING A DENSITY OF LESS THAN 75 POUNDS PER CUBIC FOOT, A SECOND LAYER COVERING SAID MONOLITHIC LAYER, SAID SECOND LAYER COMPOSED OF ABRASION RESISTANT REFRACTORY CONCRETE CONTAINING A SUBSTANTIAL PORTION OF HARD DENSE REFRACTORY AGGREGATE, SAID ABRASION RESISTANT CONCRETE HAVING A DENSITY GREATER THAN 100 POUNDS PER CUBIC FOOT, SAID ABRASION RESISTANT LAYER OF CONCRETE DEPOSITED ON THE INNER SURFACE OF SAID MONOLITHIC LAYER AND EXTENDING INWARDLY FOR THE FULL THICKNESS OF SAID GRID STRUCTURE TO BE REINFORCED THEREBY, SAID ABASION RESISTANT LAYER FORMED AS A PLURALITY OF SEPARATE PANELS EACH SUBSTANTIALLY COEXTENSIVE WITH A RESPECTIVE PANEL OF SAID METAL GRID STRUCTURE, AND INLET AND OUTLET MEANS OPENING INTO THE INTERIOR OF SAID VESSEL ADAPTED FOR ENTRANCE AND REMOVAL OF SAID SOLIDS AND GAS.