【Q&A Question 211】2017.07.30
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【Q&A Question 211】July 30, 2017: What are the hazards of too low feed rate to the device? The reference answers will be visible after responding; scoring is granted by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) ① At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature ； ②Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； ③Too low an air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； ④Too low an air velocity can cause channeling in the reaction bed ； ⑤When the feed rate is too low, it becomes more difficult to operate the distillation system. Scoring criteria: 2 Wealth points for incorrect responses; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by detailed explanations; responses that are correct but lack sufficient details earn 15–20 Wealth points. Please score according to these criteria. Note: If there are editing records after answering, only those who participated will be credited points. 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 have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) 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 Zone – “Creative Ideas for Energy Saving” campaign (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum)
① At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature. ② A too low space velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface. ③ Too low an air velocity results in a higher content of light components in the products, especially an increase in the amount of gas. ④ Too low an air velocity can lead to channeling in the reaction bed.⑤ When the feed rate is too low, it becomes more difficult to operate the distillation system.
It will result in a low concentration of the material at the top of the tower
The disadvantages include: ① At the same temperature, a low space velocity and long residence time lead to intense hydrogenation reactions, which can make it difficult to control the bed temperature. ② An excessively low space velocity increases the likelihood of condensation reactions, resulting in coking on the catalyst surface. ③ Too low an air velocity results in a higher content of light components in the products, especially an increase in the amount of gas. ④ Too low an air velocity can lead to channeling in the reaction bed.⑤ When the feed rate is too low, it becomes more difficult to operate the distillation system.
1. Abnormal operation due to too low flow rate of the feed pump. 2. Coking of the catalyst inside the reactor. 3. The reaction depth may become too high if cooling is not applied
①Low space velocity and long residence time lead to intense hydrogenation reactions, making it difficult to control the bed temperature； ②Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； ③Too low an air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； ④Too low an air velocity can cause channeling in the reaction bed ； ⑤When the feed rate is too low, it becomes more difficult to operate the distillation system.
1. At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature； 2. An excessively low space velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； 3. An excessively low air velocity increases the content of light components in the products, especially the amount of gas ； 4. Too low an air velocity can lead to channeling in the reaction bed ； 5. A low air velocity increases the operational difficulty of the distillation system.
The disadvantages of too low feed rate to the unit are: (1) at the same temperature, the space velocity is low and the residence time is long, resulting in intense hydrogenation reactions that can make it difficult to control the bed temperature. (2) An excessively low space velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface. (3) An excessively low space velocity results in a higher proportion of light components in the products, especially an increase in the amount of gas. (4) Too low an air velocity can cause channeling in the reaction bed. (5) When the feed rate is too low, the operation of the distillation system becomes more difficult
1) At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature； 2) Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； 3) An excessively low air velocity results in a higher content of light and heavy components in the products, especially an increase in the amount of gas ； 4) Too low an air velocity can cause channeling in the reaction bed ； 5) When the feed rate is too low, the operation of the distillation system becomes more difficult.
If the air velocity is too low, the catalyst tends to coking, and the thermal load of the system is too low
The furnace tubes tend to coking. Low air velocity results in a large temperature rise during the reaction, causing the catalyst to be easily damaged. The distillation system is difficult to operate.