Dear Mr. Lieberman, What should be the maximum oxygen content we can maintain coker heater stack? I heard that some of the shell cokers even operate more than 8%. What is the reason?
---Prabhakar , India
Prabhakar, the higher the excess O2, the cooler the radiant firebox. The reduction in radiant heat density is offset by the increased convective section duty. The lower radiant heat transfer rate results in reduced radiant tube coking and longer heater run lengths. Of course, energy efficiency suffers.
---Norm
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