【Q&A Question 132】2016.08.30
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【Q&A Question 132】August 30, 2016: What are the reasons for an increase in the radial temperature difference within the reactor’s catalyst bed? The answer key can be seen after responding; scoring is based on identifying the key points. 1. Collapse of the catalyst bed. 2. Formation of a \"cover\" on top of the catalyst bed. 3. Severe fouling of the distribution plate at the top. 4. Damage to the structural support of the bed. 5. Significant fluctuations in process parameters such as feed rate and recycle hydrogen flow.
I have no experience with hydrogenation, but I’ll try to answer: the radial temperature difference in the reactor is likely related to the quality of installation and fabrication of the distributor, to the way the catalyst is packed, as well as to any coking or blockages in the catalyst bed. It may also be related to the viscosity of the material used. I’m not sure if this is correct; please advise.
The catalyst is not evenly distributed, resulting in uneven distribution of oil and gas.
1. Collapse of the catalyst bed； 2. A “cover formation” occurs at the top of the catalyst bed” ； 3. Severe scaling on the top distribution panel ；
Too low air velocity, uneven catalyst packing, too low feed rate, too low recycle hydrogen volume, local coking
Catalyst coking, uneven radial distribution on the distributor plate, and significant variations in raw material properties
Uneven catalyst loading, poor quality of catalyst, channeling in the bed, failure of the catalyst support plate, thermocouple failure
1. The catalyst packing density is uneven. 2. The air velocity is below the design value. 3. The raw materials are not distributed evenly when entering the reactor.
What are the reasons for the increase in radial temperature differences within the reactor catalyst bed? ①① The catalyst bed collapses; ② A \"cover\" forms on the top of the catalyst bed; ③ The distribution plate at the top becomes severely fouled