Why does the hotspot temperature drop?
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Why does the hotspot temperature drop?
How is it that no one has answered such a good question? Let me share my own opinion first. The shift of the hot spot downward may be due to a sudden increase in air velocity or gas flow, which pushes the temperature of the catalyst in the upper layer downward to the lower layer; as the temperature in the upper layer decreases, reactions there decrease, while reactions in the lower layer increase, resulting in more heat release and an increase in temperature. It is also possible that over time the activity of the upper catalyst gradually decreases, causing more and more reactions to take place in the lower layer.