Patent ID: 6425757
Filing Date: 2002-07-30
Classification: C10G

Abstract:
A pyrolysis heater for the conversion of hydrocarbons to olefins comprising:a. a radiant heating zone; b. a plurality of heating coils each having inlet passes and outlet passes arrayed in a line in said radiant heating zone with the inlet passes of each coil being adjacent to the inlet passes of an adjacent coil and with the outlet passes of each coil being adjacent to the outlet passes of an adjacent coil; and c. a plurality of hearth burners spaced from each other along a line parallel to and spaced from said line of coils, said hearth burners comprising burners of a first firing rate and burners of a second higher firing rate, said burners of a first firing rate being aligned with said outlet passes of said coils and said burners of a second higher firing rate being aligned with said inlet passes of said coils, said burners of a second higher firing rate being arranged in spaced adjacent pairs and each comprising fuel nozzles directed upwardly and inclined at an angle toward said adjacent burner of said pair.