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Steamout rate to Fractionator column


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Recently we have a foamover incident. That has caused a 10-day shutdown. Before the incident,
our practice is to switch the drum once the 3rd nuclear source level is exceeded. Then we would inject 7 tonnes/hr of steam into the coke drum and routed to Fractionator for 20 minutes. We have seen coke fines carried over into the fractionator. The question is that, should we reduce the steam rate to reduce amount of coke fines into fractionator? Our coke drum before-quench temperature is normally between 430- 445 C. At what rate shall be the max for the steamout rate as not to cause coke fine carry over?

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