Shutdown handling of catalytic unit
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When the catalytic fractionation system is shut down, is it appropriate to use steam for direct purging of the overhead circulation system? Should I treat it with water first and then use steam to clean it? (Specific handling method). Please ask an experienced sea traveler to provide an answer
After filling with water, drain the remaining water and then purge with steam.
The light components in the top circulation oil will vaporize when directly purged with steam; generally, water is used to push them to the top first before steam is applied for purification.
Is this comment from a sea traveler based on experience? How does the upper water top process work? The time at the water’s surface?
When the catalytic fractionation system is shut down, is it appropriate to use steam for direct purging of the overhead circulation system? Should I treat it with water first and then use steam to clean it? (Specific handling method). Regarding this issue, top-loop oil refers to crude gasoline and condensed oil; these substances vaporize when exposed to high temperatures. It is necessary to first use water to push them out, then carry out washing, drain all the water, and finally purge with steam.
The top circulation oil should be crude gasoline; it is necessary to first push water through it, then carry out washing, remove all the water, and finally purge it with steam. Purge process, purge time, purge result, person who performed purge, remarks. The purging procedures are fixed.
Water is supplied at the inlet of the crude gasoline pump at the top of the tower; it enters the top circulation system via the cold reflux line, with water on top of the gasoline. It takes no long time; the effect can be checked by taking samples from any coagulation point in the system.
Water must be used for pushing first, followed by steam purging; the circulating oil has properties intermediate between diesel and gasoline, with components that lean more toward gasoline.
Upon careful analysis, it seems more reasonable to use water to push Bi first. Our catalytic unit has never been flushed with water; it is cleaned directly with steam. The original design also did not have a water top line, so it was not possible to have water at the top.
I would like to ask this sea friend: where has the top circulation oil been sent? What time is the water topped up?