Reasons for the increase in nitrogen and oxygen content in catalytic dry gas
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There was a question like this in today’s workshop exam; could some experts please give me some advice?
Your catalyst is of the coaxial type, meaning both components are perforated
Are there any other reasons? What are the symptoms if both organs are perforated?
There is only one reason: air got in during sampling
This situation occurred once in our unit, with the air content in the dry gas component reaching over 20%. At that time, it was suspected that there were leaks in the two vessels; for safety reasons, the unit was shut down urgently. Upon inspection, cracks were found in the welds at the connection between the lower part of the stripping section and the vertical pipe, which led to cross-contamination between the two vessels
Another reason is that the degassing of the regenerating agent is inadequate, and the sliding degree is too high
Since it’s an exam question, it refers to the judgment of accident conditions. Adjustments for normal operation, such as sampling and inclined tube degassing, may experience changes, but they will not be significant. So if it’s a coaxial type, it can only be an issue with the perforations in the two components.