Patent ID: 6312652
Filing Date: 2001-11-06
Classification: B01J,C10G,Y10S

Abstract:
A cracking furnace, comprisinga firebox containing a plurality of radiant burners;a tube and pipe structure comprising an interior ceramic refractory pipe having a first and second open end;an exterior ceramic refractory tube having a first open end, a second closed end and an interior surface defining its interior diameter; said interior ceramic refractory pipe having an exterior surface defining an outside diameter which is less than the interior diameter of said exterior ceramic refractory tube, said interior ceramic refractory pipe being suspended within said exterior ceramic refractory tube such that the second open end of said pipe is spaced apart from the second closed end of said tube and an annular space exists between the exterior surface of said pipe and the interior surface of said tube;means for suspending said tube and pipe structure such that the second ends of said tube and pipe structure are within the fire box and the first open ends of said tube and pipe structure are outside of the firebox;means for feeding a preheated hydrocarbon containing feed stock gas mixture to an interior space of said pipe through its first open end whereby said feed stock gas mixture passes to the second end of said pipe and then into the annular space existing between said pipe and said tube, and means for receiving a discharge of a cracked hydrocarbon product gas mixture from the first open end of said tube.