A question regarding the hydrogen production plant
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“Once the converter catalyst is oxidized under accident conditions, it must be reduced before feeding can be resumed. How is it determined that the catalyst has been oxidized?
It must have come into direct or indirect contact with the oxide
There has to be some basis for it; you can’t just say whatever comes to mind
1. Direct or indirect contact with oxides
2. The catalyst efficiency is significantly reduced
The most straightforward way to determine this is by checking whether the outlet temperature rises and whether the methane content at the outlet increases
It’s simply not possible to meet the conditions for hydrogen and steam supply; moreover, oxidation during high-temperature phases must be avoided, as the reduction process requires temperatures higher than those used for high-temperature oxidation, so such oxidation should not take place.
This post was last edited by Green Lotus on 2018-11-21 at 16:33. Oxidation does not occur under the physical conditions of hydrogen over an extended period of time. Also, with no change in the color of the furnace tube and no significant change in the outlet temperature, the methane content at the outlet increased.
Well, but how do you tell if it has been oxidized?
After the feed to the converter is interrupted, when there is only steam present, it’s an oxidation process, understand? In a converter that remains in a steam state for an extended period, oxidation occurs; to restore the activity of the conversion catalyst, it is necessary to reduce the catalyst. I’m not sure if I made myself clear.
But it says that \"the catalyst is oxidized once an accident occurs\", once it is oxidized. In an accident scenario, the feed is cut off and only steam is supplied. Does that mean that the catalyst gets oxidized as soon as an accident occurs? Can it be understood that way?