【Q&A Question 052】2018.02.21
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【Q&A Question 052】February 21, 2018: The main factors affecting the fluctuations in the temperature rise of the catalyst bed in the reactor are: ① Changes in the bromine value, sulfur, and nitrogen contents in the feed oil, especially changes in the bromine value. 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 experiences flow deviation or the heat exchanger has a short circuit. ⑥Airspeed variation. ⑦The catalyst cokes or gets poisoned, resulting in a decrease in its activity. ⑧The raw material contains water. ⑨Fluctuations in reactor inlet temperature. ⑩Fluctuations in the rapid cooling hydrogen flow rate. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently ongoing in the Chemical Engineering section) https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978. Summary post of daily questions for the 2018 Chemical Engineering Technology Training section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971. Summary post of daily images for the 2018 Registered Equipment section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970. Summary post of Q&A questions for the 2018 Hydrogen Production and Hydrogenation Technology section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968. Summary post of daily questions for the 2018 LNG Technology Discussion section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973. Summary post of Q&A questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html. Summary post of daily questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html. Summary post of daily images for 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160. List of daily questions for the 2017 LNG section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162. Summary post of Q&A questions for 2016 (updates completed): https://bbs.hcbbs.com/thread-1597792-1-1.html
Changes in oil properties (mainly olefin content), fluctuations in reactor inlet temperature, fluctuations in cold hydrogen flow rate to the bed
Changes in oil properties (mainly olefin content), fluctuations in reactor inlet temperature, and fluctuations in cold hydrogen flow rate to the bed.
Factors to consider affecting the temperature rise fluctuations in the reactor catalyst bed: 1. Changes in the sulfur and nitrogen content in the feed oil. 2. The cycle time of the reaction system is too long. 3. Changes in hydrogen purity and recycle gas flow rate 4. Changes in total system pressure 5. Reactor cross-flow or heat exchanger short circuit 6. Changes in space velocity 7. Catalyst poisoning, coking, or loss of activity 8. Water content in the feedstock 9. Fluctuations in reactor inlet temperature 10. Fluctuations in quench fluid flow rate
Properties of crude oil, temperature, hydrogen-to-oil ratio, space velocity, pressure, amount of recycled hydrogen
Factors to consider affecting the temperature rise fluctuations in the reactor catalyst bed: ① Changes in the sulfur and nitrogen contents in the feed oil. ②The cycle time for modifying the reaction system is too long. ③Changes in hydrogen purity and circulating gas flow rate. ④Change in total system pressure. ⑤The reactor has a flow deviation or the heat exchanger is short-circuited. ⑥Airspeed variation. ⑦The catalyst cokes or gets poisoned, resulting in a decrease in its activity. ⑧The raw material contains water. ⑨Fluctuations in the reactor inlet temperature. ⑩Fluctuations in the rapid cooling hydrogen flow rate.
Changes in oil properties (mainly olefin content), fluctuations in reactor inlet temperature, and fluctuations in cold hydrogen flow rate to the bed.
Properties of the raw materials, hydrogen partial pressure, amount of cold hydrogen, temperature at the outlet of the reaction furnace, and so on
Changes in oil properties (mainly olefin content), fluctuations in reactor inlet temperature, fluctuations in cold hydrogen flow rate to the bed
Factors to consider affecting the temperature rise fluctuations in the reactor catalyst bed: ① Changes in the sulfur and nitrogen contents in the feed oil. ②The cycle time for modifying the reaction system is too long. ③Hydrogen purity and changes in cycle gas flow rate. ④Change in total system pressure. ⑤Reactor bypass or heat exchanger? Take a short circuit. ⑥Airspeed variation. ⑦The catalyst cokes or gets poisoned, resulting in a decrease in its activity. ⑧Raw material strip? Water. ⑨Fluctuations in the reactor inlet temperature. ⑩Fluctuations in the rapid cooling hydrogen flow rate.
1. Reactor inlet temperature； 2. Hydrogen-to-oil ratio at the reactor inlet ； 3. Properties of crude oil ； 4. Circulating hydrogen volume and purity ； 5. Quench hydrogen injection rate ； 6. Reaction pressure.