Regarding the shutdown of the diesel hydrogenation unit
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With the diesel unit shut down, what is the status of the materials inside it? Do they remain in circulation within the system until the temperature drops to the specified level before being removed, or is feeding to the unit stopped while the temperature decreases so that the materials can be withdrawn?
Reduce pressure and temperature to around 230°C, carry out dehydrogenation at a constant temperature, then use hydrogen in circulation to carry the oil away, and remove the material!
The materials keep circulating inside, right? What should be done with the desulfurization system at this time?
Before shutting down the operation, stop the desulfurization system, and then test the hydrogen sulfide content in the circulating hydrogen every hour