Patent ID: 8282814

Claim:
A hydrocarbon conversion process comprising passing a hydrocarbon stream through at least one fired heater comprising a radiant section, an inlet manifold, an outlet manifold, at least one heater tube having an inlet and an outlet wherein the inlet is in fluid communication with the inlet manifold, at least one restriction orifice located within the inlet manifold adjacent the inlet of a heater tube or between the inlet manifold and the inlet of a heater tube, and at least one burner before passing the stream to at least one reaction zone wherein the at least one fired heater further comprises a plurality of interheaters, wherein each interheater comprises at least one burner, a radiant section, a manifold, at least one heater tube having an inlet and an outlet wherein the inlet is in fluid communication with the inlet manifold, at least one restriction orifice located within the inlet manifold or adjacent the inlet of a heater tube or between the inlet manifold and the inlet of a heater tube, and the process further comprising passing an effluent from a first reaction zone to a first interheater wherein the effluent from the first reaction zone passes through the first interheater before exiting the first interheater to enter a second reaction zone.