Heat exchanger with concentric flow passageways

Claim 1

A HEAT EXCHANGER, COMPRISING: AN UPSTANDING CYLINDRICAL CASING HAVING A LINING OF REFRACTORY MATERIAL, SAID CASING HAVING A FIRST INLET COMMUNICATING WITH THE BOTTOM THEREOF; A CAP REMOVABLY CLOSING THE UPPER END OF SAID CASING; OUTER AND INNER CYLINDRICAL SLEEVES OF LARGE DIAMETER MOUNTED CONCENTRICALLY AND SPACED A SHORT DISTANCE APART TO PROVIDE A NARROW FIRST ANNULAR SPACE THEREBETWEEN, SAID SLEEVES BEING POSITIONED WITHIN SAID CASING WITH SAID OUTER SLEEVE BEING SPACED FROM THE INNER SURFACE OF SAID LINEAR TO PROVIDE A SECOND ANNULAR SPACE THEREBTWEEN, THE FIRST ANNULAR SPACE BEING CLOSED AT THE TOP AND OPEN AT THE BOTTOM, MEANS FORMING A PASSAGE BETWEEN THE INTERIOR OF THE INNER SLEEVE AND THE SECOND ANNULAR SPACE AT THE UPPER END OF THE CASING, SAID INNER SLEEVE EXTENDING TO THE BOTTOM OF SAID CASING FOR COMMUNICATING WITH SAID FIRST INLET WHEREBY A HEATED FLUID SUPPLIED THROUGH SAID FIRST INLET FLOWS UPWARDLY THROUGH SAID SECOND SLEEVE AND THEN DOWNWARDLY THROUGH SAID SECOND ANNULAR SPACE; MEANS DEFINING A FIRST OUTLET FROM SAID CASING ADJACENT THE LOWER END OF SAID SECOND ANNULAR SPACE WHEREBY SAID HEATED FLUID FLOWING THROUGH SAID SECOND ANNULAR SPACE CAN BE DISCHARGED; MEANS DEFINING A SECOND INLET IN SAID CASING COMMUNICATING WITH THE LOWER END OF SAID FIRST ANNULAR SPACE AND ISOLATED FROM SAID FIRST INLET AND SAID FIRST OUTLET WHEREBY A FLUID TO BE HEATED CAN BE SUPPLIED TO SAID FIRST ANNULAR SPACE; MEANS DEFINING A SECOND OUTLET EXTENDING LATERALLY THROUGH SAID CASING AND COMMUNICATING WITH THE UPPER END OF SAID FIRST ANNULAR SPACE WHEREBY THE FLUID TO BE HEATED CAN BE DISCAHRGED FROM THE CASING; A PLURALITY OF TUBULAR MEMBERS SECURED TO AND PENETRATING THE OUTER SLEEVE AT THE UPPER END THEREOF AND EXTENDING LATERALLY THEREFROM; A FLANGED RING SECURED TO SAID TUBULAR MEMBERS AND INCLUDING A PORTION WHICH EXTENDS OUTWARDLY AND UPWARDLY TO BE SECURED BETWEEN THE CAP AND THE CASING WHEREBY THE SLEEVES ARE SUPPORTED ON THE CASING AND THE SLEEVES CAN BE REMOVED FROM THE CASING AND THE CAP IS REMOVED; AND A RING OF HEAT INSULATION MATERIAL OF SUBSTANTIALLY TRIANGULAR CROSS-SECTION DISPOSED BETWEEN SAID LINING AND SAID PORTION OF SAID FLANGED RING ABOVE SAID TUBULAR MEMBERS TO PREVENT OVERHEATING OF THE JOINT BETWEEN THE CASING AND THE CAP.