Why is hot hydrogen needed to carry oil during gasoline shutdown?
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Can nitrogen be used as a substitute for hydrogen to carry oil in hot hydrogen processes when there is no hydrogen available?
When shutting down, use the residual cyclic hydrogen inside to drive the oil away – why is there no hydrogen?
Yes, hydrogen can be used to carry the oil stored in the heat exchangers and reactors to the light and heavy fractions, which are then sent out through the distillation unit
The hydrogen-handling system cannot be purged with hydrogen; instead, oil must be circulated to carry away the oil from the reaction system
Because a full cycle is generally required
During shutdown, recycled hydrogen is used to carry oil with heat, primarily to remove the oil components from the catalyst and prevent coking on its surface
As for whether nitrogen can be used to carry oil, it is possible in principle, but a certain temperature is required and there is significant waste; therefore, its use is generally not recommended. If hydrogen supply is interrupted and the hydrogen pressure drops, nitrogen can be used to provide some supplementary pressure
Can the circulation system withstand it if nitrogen is used?
It’s possible that the circulating hydrogen compressor is broken