Regarding the feed temperature of the diesel hydrogenation unit
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Gentlemen, I talked with an experienced technician today. He said that when starting up the diesel hydrogenation unit and raising its temperature, gas should be used for this purpose; using oil directly would have an impact on the catalyst. However, considering the temperature of the reactor beds, during normal operation the temperature of a single reactor bed simply isn’t high enough to vaporize all of the feed oil. I’m not sure how to understand this
The uneven distribution of the heating temperature in the furnace due to the crude oil leads to flow deviations, which can cause coking in the furnace tubes! Furthermore, the catalyst can be easily damaged; in the process of heating, the absence of circulating hydrogen can lead to overheating, which causes carbon deposition on the catalyst
So are you saying to heat the gas medium alone, or to mix the gas with a liquid?
Is the initial process a one-time pass or a loop? If it is a cycle, is it necessary to inject sulfur during that period to prevent catalyst reduction?
It is mainly to prevent catalyst reduction; as long as there is hydrogen sulfide in the recycle hydrogen, it is not necessary to feed oil at low temperature