[Q&A Question 223] 2018.08.17
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【Q&A Question 223】August 17, 2018: In actual production, radial temperature differences can occur in reactors. What are the reasons that lead to an increase in such radial temperature differences within the catalyst bed of a reactor? ①The catalyst bed collapsed ； ②A ‘cap’ forms at the top of the catalyst bed” ； ③The top distribution plate is severely fouled ； ④Damage to the bed layer support structure ； ⑤Process parameters such as feed rate and recycled hydrogen volume change significantly. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
The catalyst is not evenly packed； Thermocouple failure or malfunction ； catalyst channeling
The catalyst is not evenly packed, and the thermocouple is malfunctioning
1. Collapse of the catalyst bed 2. Formation of a cover on the top of the catalyst bed 3. Severe scaling on the top distribution plate 4. Serious damage to the bed support structure 5. Significant changes in process parameters such as feed rate and recycle hydrogen volume
1) The catalyst bed collapses； 2) A “cap formation” occurs at the top of the catalyst bed” ； 3) Severe scaling on the top distribution plate ； 4) Damage to the bed layer support structure ； 5) Significant changes in process parameters such as feed rate and recycle hydrogen volume.
1. Collapse of the catalyst bed 2. Formation of a cover on the top of the catalyst bed 3. Severe scaling on the top distribution plate 4. Serious damage to the bed support structure 5. Significant changes in process parameters such as feed rate and recycle hydrogen volume
1. Uneven distribution of feed gas； 2. Local deactivation of the catalyst ； 3. Local catalyst deformation.
Answer: ① The catalyst bed collapses； ②A ‘cap’ forms at the top of the catalyst bed” ； ③The top distribution plate is severely fouled ； ④Damage to the bed layer support structure ； ⑤Process parameters such as feed rate and recycled hydrogen volume change significantly.
There are: 1. Collapse of the catalyst bed 2. Formation of a crust on the top of the catalyst bed 3. Severe scaling on the top distribution plate 4. Serious damage to the bed support structure 5. Significant changes in process parameters such as feed rate and recycled hydrogen volume