【Q&A Question 184】2017.07.03
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This post was last edited by liuquan1100 on 2017-8-7 21:34. [Q&A Question 184] 2017.07.03: What are the main factors affecting the fluctuations in the temperature rise of the catalyst bed in a reactor? 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.) ) 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. Changes in the bromine number, sulfur, and nitrogen contents in the feed oil, especially changes in the bromine number. 2. The circulation time in the reaction system is too long. 3. Changes in hydrogen purity and the flow rate of the recycled gas. 4. Changes in the total system pressure. 5. Deviation in reactor flow or short-circuiting in the heat exchanger. 6. Changes in space velocity. 7. Catalyst coking or poisoning, leading to a decrease in activity. 8. Water content in the feed oil. 9. Fluctuations in the temperature at the reactor inlet. 10. Fluctuations in the flow rate of the quenching hydrogen. 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 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
Raw material variation: high sulfur content containing olefins or moisture content
Changes in the bromine number, sulfur, and nitrogen contents in the feed oil, especially changes in the bromine number. 2. The circulation time in the reaction system is too long. 3. Changes in hydrogen purity and the flow rate of the recycled gas. 4. Changes in the total system pressure. 5. Deviation in reactor flow or short-circuiting in the heat exchanger. 6. Changes in space velocity. 7. Catalyst coking or poisoning, leading to a decrease in activity. 8. Water content in the feed oil. 9. Fluctuations in the temperature at the reactor inlet. 10. Fluctuations in the flow rate of the quenching hydrogen.
1) 2. Changes in the bromine number, sulfur, and nitrogen contents in the crude oil, particularly changes in the bromine number. 2) The cycle time for modifying the reaction system is too long. 3) Changes in hydrogen purity and recycle gas flow rate. 4) Change in total system pressure. 5) Reactor bypass or heat exchanger short circuit. 6) Air velocity variation. 7) Coking or poisoning of the catalyst, resulting in a decrease in its activity. 8) Moisture in the raw material strip. 9) Fluctuations in reactor inlet temperature. 10) Fluctuations in the rapid cooling hydrogen flow rate.
1. Feedstock； 2. Water content ； 3. Fluctuations in fuel gas ；
The main factors affecting the fluctuations in temperature rise of the catalyst bed in the reactor: 1. Changes in the bromine number, sulfur, and nitrogen contents in the feed oil, especially changes in the bromine number. 2. The cycle time of the reaction system is too long. 3. Changes in hydrogen purity and recycle gas flow rate. 4. Change in total system pressure. 5. Reactor flow deviation or short circuit in the heat exchanger. 6. Airspeed variation. 7. Catalyst coking or poisoning, resulting in reduced activity. 8. Moisture in the raw material strip. 9. Fluctuations in reactor inlet temperature. 10. Fluctuations in the flow rate of the quench hydrogen.
Raw material properties, catalyst activity, outlet temperature of the heating furnace, pressure in the hydrogen-rich system, raw material feed rate, hydrogen-to-oil ratio, purity of recycled hydrogen
①Changes in the bromine number, sulfur, and nitrogen contents in the crude oil, particularly changes in the bromine number. ②The cycle time for modifying the reaction system is too long. ③Changes in hydrogen purity and recycle gas flow rate. ④Change in total system pressure. ⑤The reactor has a flow deviation or the heat exchanger is short-circuited. ⑥Airspeed variation. ⑦Catalyst coking or poisoning, reduced activity. ⑧ Moisture in the feedstock. ⑨Fluctuations in reactor inlet temperature. ⑩Fluctuations in the rapid cooling hydrogen flow rate.
1. Changes in the bromine number, sulfur, and nitrogen contents in the crude oil, particularly changes in the bromine number. 2. The cycle time of the reaction system is too long. 3. Changes in hydrogen purity and recycle gas flow rate. 4. Change in total system pressure. 5. Reactor flow deviation or short circuit in the heat exchanger. 6. Airspeed variation. 7. Catalyst coking or poisoning, resulting in reduced activity. 8. Moisture in the raw material strip. 9. Fluctuations in reactor inlet temperature. 10. Fluctuations in the flow rate of the quench hydrogen.
①Changes in the bromine number, sulfur, and nitrogen contents in the feed oil, especially changes in the bromine number. ② The circulation time in the reaction system is too long. ③ Changes in hydrogen purity and the flow rate of the circulating gas. ④ Changes in the total system pressure. ⑤ Flow deviation in the reactor or short-circuiting in the heat exchanger. ⑥ Changes in space velocity. ⑦ Coking or poisoning of the catalyst, resulting in a decrease in its activity; ⑧ Fluctuations in the temperature at the reactor inlet; ⑨ Fluctuations in the flow rate of the quenching hydrogen.
The properties of the raw materials have changed； Fluctuations in the outlet temperature of the heating furnace