Patent ID: 7135105

Claim:
A pyrolysis furnace with new type heat supply, comprising: a) a vertically arranged radiant section ( 3 ), in which burners and groups of radiant tubes ( 7 ) are arranged for high temperature cracking hydrocarbons feedstock; b) a vertically arranged convection section ( 2 ), located above the radiant section and axially shifted therewith, in said convection section groups of convection tubes ( 1 ) are arranged for preheating the hydrocarbons feedstock; and c) a horizontally arranged crossover section ( 6 ), connected between said radiant section ( 3 ) and said convection section ( 2 ); wherein, both top burners ( 9 ) and bottom burners ( 8 ) are arranged in said radiant section ( 3 ), and said crossover section ( 6 ) is extended out from a middle-upper portion of a side wall of the radiant section ( 3 ) and connected to a bottom portion of the convection section ( 2 ), and a top wall of said cross over section ( 6 ) is located under a top wall of said radiant section ( 3 ), a distance H between the two top walls is determined by the top/bottom burners' ( 9 , 8 ) heat supply ratio R, such that when R varies in a range of 1:9–7:3, the distance H is in a range of 10%–50% of a total height of the radiant section ( 3 ).