Catalyst issue
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We have 6 thermocouples here, with 8 measurement points on each, and the catalyst was replaced last October. Now, 4 of them have a decrease in temperature at the top and an increase in temperature at the bottom. Two of them are showing upward and downward trends, and the hot spot is also among them; it is located at 350 mm (out of a total of 3000 mm). The hot spot has been on the rise continuously – could this be due to excessive catalyst activity?
It’s not clear what the catalyst is; generally, it’s due to gas bias flow, catalyst caking, or internal component leakage.