Catalytic cracking air volume issue
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In a coaxial catalytic cracking unit, what are the disadvantages of using an excessive amount of air flow during catalyst regeneration?
Tail burning will occur, and the dilute-phase temperature will be extremely high.
Today, I measured the oxygen content in the flue gas at 2%, and there was no backburning
What do you mean? Could you explain it more clearly?
It depends on whether it is oxygen-poor regeneration or oxygen-rich regeneration, as well as whether it is single-stage regeneration or two-stage regeneration.
When the air flow rate is too high, tail burning does not necessarily occur. This is related to the structural form of your regeneration system and the composition of its raw materials. If the raw material is relatively light, tail burning will not occur; tail burning requires excess oxygen and sufficient carbon monoxide. Excess main air alone will not cause afterburning. Excessive air volume simply results in higher energy consumption. The catalyst experiences relatively more wear and loss. There are also advantages; it has strong risk resistance when raw material prices fluctuate.
High energy consumption, which may lead to afterburning