What causes the periodic fluctuations in the main lifting of the catalyst in a continuous reforming unit?
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The main lift in my continuous reforming unit experiences periodic fluctuations; that is, there is a significant change every about 1 hour, and such fluctuations last for less than 5 minutes. I hope everyone can share their views and discuss this together.
It’s UOP’s several-generation technology; please describe the phenomena in detail so I can help analyze them.
Check whether the amount of nitrogen used for backblowing in the dust removal system is too high! Check the secondary lift air valve! Is there something wrong with the regenerated gauge!
When the catalyst is lifted, the pressure difference in the lifting pipeline increases due to the effect of the catalyst and the lifting air; this increase is usually around 2%-5%. However, when the amount of catalyst being lifted is at its maximum, the pressure difference in the lifting pipeline reaches its highest value. In such cases, CRCS outputs a signal to reduce this value, as an excessive pressure difference would prevent further lifting of the catalyst. As this value decreases, that is, as the amount of lifting air decreases, the material level rises, and the isolation pressure difference falls. To prevent too low a pressure difference, CRCS sends a signal to increase the amount of catalyst being lifted, which results in periodic fluctuations!