[Q&A Question 202] 2017.07.21
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【Q&A Question 202】July 21, 2017: What are the reasons for accelerated catalyst carbon deposition? The reference answers will be visible after responding; scoring is awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Note: For questions of the type \"one question per day,\" if a person replies continuously for a month, that is, posts more than 30 times, their score will be assigned as 2 points, which is the lowest possible score. Click once to reply; if multiple replies are made, points will be awarded as appropriate, as deleting posts is also a waste of time. Answer: ① The reaction temperature is too high. ② Large fluctuations in temperature. ③ The hydrogen-to-oil ratio has decreased significantly. (④ The dry point of the crude oil is too high. Scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided with a detailed explanation; 15–20 Wealth points if the answer is correct but lacks sufficient details. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming. Points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Savings” Campaign (Second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
1\ High reaction temperature 2\ Large fluctuations in temperature 3\ Significant decrease in the hydrogen-to-oil ratio 4\ Excessively high dry point of the feed oil
It is generally caused by factors such as uneven catalyst packing, an imbalance in the water-to-carbon ratio, increased load, increasing heaviness of the feed oil, catalyst poisoning or deactivation, a decline in activity or anti-coking performance, and large fluctuations in conversion temperature and pressure.
Imbalance in the water-to-carbon ratio, increased load, high density of the feed oil, catalyst poisoning or deactivation, and large fluctuations in temperature and pressure
First, the crude oil has a high content of impurities. Second, the reactor inlet temperature is high. Third, the pressure drop across the catalyst bed is high
First, the crude oil has a high content of impurities. Second, the reactor inlet temperature is high. Third, the pressure drop across the catalyst bed is high
First, the crude oil has a high content of impurities. Second, the reactor inlet temperature is high. Third, the pressure drop across the catalyst bed is high
1. High reaction temperature； 2 Large temperature fluctuations ； 3. The hydrogen-to-oil ratio has decreased significantly ； 4. The dry point of the crude oil is too high.
The feed contains many impurities, the hydrogen-to-oil ratio is too low, and there are large fluctuations in the feed
The feed contains many impurities, the hydrogen-to-oil ratio is too low, and there are large fluctuations in the feed