Pyrolysis heater with paired burner zoned firing system

Abstract

A pyrolysis heater has the inlet sections of the process coils grouped together and the outlet sections of these same process coils also grouped together. High heat liberation hearth burners are located adjacent to the inlet sections of the coils and lower heat liberation burners are located adjacent to the outlet sections. The secondary fuel tips of the burners are inclined toward the adjacent, heater wall. The high heat liberation hearth burners adjacent to the inlet coils are arranged in spaced apart pairs with the secondary burner tips of each of the pair being inclined toward the other burner of the pair.

Description

technical field

[0001] This invention relates to pyrolysis heaters and in particular to an improved burner arrangement for controlling heat flow to different sections of a process coil. Background technique

[0002] A typical pyrolysis heater consists of one or more combustion chambers consisting of a radiant heating section and one or more upper convective sections including a material preheater. The radiant heating section includes a plurality of radiant process coils suspended at the center plane between the two radiant walls of the combustion chamber. The channels of each row of coils are mostly forged as tubes that gradually increase in diameter towards the outlet end. Typically coils have a number of parallel smaller tubes at the inlet end and a few larger tubes at the outlet end.

[0003] Vertical burners are placed on the hearth or floor of the combustion chamber and these burners are used as heat sources in many types of pyrolysis heaters. In the ethylene crackin...

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