【Q&A Question 256】2018.09.19
Thread Content
This post was last edited by Green Lotus on 2018-9-19 at 11:01. [Q&A Question 256] 2018.09.19: Briefly explain the hazards of too low a feed rate for the device 1) At the same temperature, a low feed rate and long residence time lead to intense hydrogenation reactions, which can easily result in uncontrolled bed temperature. 2) An excessively low space velocity can cause coking on the catalyst surface. 3) A low space velocity results in an increased content of light components in the products. 4) A low space velocity induces channeling in the catalyst bed. 5) A low feed rate increases the operational difficulties of the distillation system. (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
1) At the same temperature, a low feed rate and long residence time lead to intense hydrogenation reactions, which can easily result in uncontrolled bed temperature. 2) An excessively low space velocity can cause coking on the catalyst surface. 3) A low space velocity results in an increased content of light components in the products. 4) A low space velocity induces channeling in the catalyst bed. 5) A low feed rate increases the operational difficulties of the distillation system.
1) At the same temperature, a low feed rate and long residence time lead to intense hydrogenation reactions, which can easily result in uncontrolled bed temperature. 2) An excessively low space velocity can cause coking on the catalyst surface. 3) A low space velocity results in an increased content of light components in the products. 4) A low space velocity induces channeling in the catalyst bed. 5) A low feed rate increases the operational difficulties of the distillation system.
1) At the same temperature, a low feed rate and long residence time lead to intense hydrogenation reactions, which can easily result in uncontrolled bed temperature. 2) An excessively low space velocity can cause coking on the catalyst surface. 3) A low space velocity results in an increased content of light components in the products. 4) A low space velocity induces channeling in the catalyst bed. 5) A low feed rate increases the operational difficulties of the distillation system.
1) At the same temperature, a low feed rate and long residence time lead to intense hydrogenation reactions, which can easily result in uncontrolled bed temperature. 2) An excessively low space velocity can cause coking on the catalyst surface. 3) A low space velocity results in an increased content of light components in the products. 4) A low space velocity induces channeling in the catalyst bed. 5) A low feed rate increases the operational difficulties of the distillation system.
1. It increases the residence time of the crude oil in the furnace tubes, slowing down the flow rate and thereby increasing the likelihood of coking, especially in furnaces with hydrogen mixing after the furnace； 2. It will lead to uneven distribution of the material within the reactor, and even channeling phenomena. Furthermore, the longer residence time in the reactor results in excessive hydrogenation and decomposition of the material, thereby reducing the liquid yield ； 3. An excessively low processing load increases the operational difficulty of the distillation system, making it very easy for the product to be substandard.
(1) At similar temperatures, a low space velocity and long residence time lead to intense hydrogenation reactions, making 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, it becomes more difficult to operate the diversion system.
1. A reduced space velocity makes it easier for the reactor to overheat, and the catalyst is prone to coking. 2. A reduced space velocity can lead to channeling within the reactor. 3. This can make the operations in the distillation unit more difficult
(1) At similar temperatures, a low space velocity and long residence time lead to intense hydrogenation reactions, making 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, it becomes more difficult to operate the diversion system.
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, it becomes more difficult to operate the diversion system.