【Q&A Question 016】2017.01.16
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This post was last edited by 955559 on 2017-7-21 at 12:54. [Q&A Question No. 016] 2017.01.16: What are the hazards of too low feed rate to the device? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) 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. 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 Xinchang Cup – 2016 HaiChuan Top 10 Selection – Please recommend candidates http://bbs.hcbbs.com/thread-1654112-1-1.html Third Round of HaiChuan Outstanding Management Members Selection http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: HaiChuan Chemical Forum)
The disadvantages of too low a feed rate are: (1) at the same temperature, the space velocity is low and the residence time is long, resulting in intense hydrogenation reactions that 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 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 cause channeling in the reaction bed ； (5) When the feed rate is too low, the operation of the diversion system becomes more difficult.
(1) At similar temperatures, 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 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 cause channeling in the reaction bed ； (5) When the feed rate is too low, the operation of the diversion system becomes more difficult.
It may cause uneven distribution of the catalyst in the reactor, as well as uneven heating of the furnace tubes
Low air velocity can easily lead to coking; high temperatures result in greater reaction depth
(1) At similar temperatures, 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 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 cause channeling in the reaction bed ； (5) When the feed rate is too low, the operation of the diversion system becomes more difficult.
Too low a feed rate results in a decrease in space velocity, an increased reaction residence time, and more intense hydrogenation reactions, which can make it difficult to control the bed temperature
The disadvantages of too low a feed rate are: 1) At the same temperature, the space velocity is low and the residence time is long, resulting in intense hydrogenation reactions that 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) Too low an 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.
Adjusting the difficulty has become more challenging； There is a risk of catalyst bias in the bed ； The feed pump may experience overcurrent, which is not conducive to its operation.
In the feed heat exchanger, the raw materials stay there for a long time, which can lead to coking; an excessive space velocity can cause the reactor to overheat
(1) At similar temperatures, 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 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 cause channeling in the reaction bed ； (5) When the feed rate is too low, the operation of the diversion system becomes more difficult.