【Q&A Question 097】2018.04.07
Thread Content
【Q&A Question 097】April 07, 2018: Briefly explain what causes a fractionation tower to experience flooding Five points can be earned if all of the following are listed: (1) Failure of the liquid level at the bottom of the tower, resulting in an excessively high liquid level ； (2) Improper operation: excessive light oil was pressed to the bottom of the tower, causing bumping ； (3) Top reflux interruption ； (4) The temperature gauge at the reboiler outlet lost control, resulting in an excessively high outlet temperature ； (5) The processing volume is too high, the load on the tower is excessive, or the trays are overturned, causing oil and gas to take a short circuit ； (6) The pumping time to evacuate the bottom of the tower is long, and the standby pump fails to start, resulting in an excessively high liquid level at the bottom of the tower ； (7) Large tower pressure fluctuations ； (8) Excessive backflow, or backflow carrying water. (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
1) The coking amount in the coke tower is too high, and foamy coke is carried to the bottom of the distillation tower. 2) The steam injection volume into the heating furnace is too high. 3) Improper operation of the distillation tower results in local gas velocities and liquid loads exceeding normal levels. 4) Tray coking or downcomer blockage. 5) The liquid level at the bottom of the distillation tower is too high, exceeding the oil and gas inlet. 6) Water carried back in the reflux stream. 7) The oil in the coke tower was not completely removed, and it vaporized instantly after the tower was changed, causing pressure surges in the tower.
1 Incomplete dehydration at high and low temperatures, resulting in water being carried into the distillation process. 2 The stripping steam load is too high. 3 The reaction depth is too great, resulting in an excessive amount of light components and thus a high gas-phase load. 4 The feed temperature to the distillation tower is too high. 5. Backflow with water.
1) The coking amount in the coke tower is too high, and foamy coke is carried to the bottom of the distillation tower. 2) The steam injection volume into the heating furnace is too high. 3) Improper operation of the distillation tower results in local gas velocities and liquid loads exceeding normal levels. 4) Tray coking or downcomer blockage. 5) The liquid level at the bottom of the distillation tower is too high, exceeding the oil and gas inlet. 6) Water carried back in the reflux stream. 7) The oil in the coke tower was not completely removed, and it vaporized instantly after the tower was changed, causing pressure surges in the tower.
1) The coking amount in the coke tower is too high, and foamy coke is carried to the bottom of the distillation tower. 2) The steam injection volume into the heating furnace is too high. 3) Improper operation of the distillation tower results in local gas velocities and liquid loads exceeding normal levels. 4) Tray coking or downcomer blockage. 5) The liquid level at the bottom of the distillation tower is too high, exceeding the oil and gas inlet. 6) Water carried back in the reflux stream. 7) The oil in the coke tower was not completely removed, and it vaporized instantly after the tower was changed, causing pressure surges in the tower.
1. Failure of the liquid level at the bottom of the tower, resulting in an excessively high liquid level； 2. Top reflux interruption ； 3. The temperature gauge at the reboiler outlet lost control, resulting in an excessively high outlet temperature ； 4. Improper operation: excessive light oil was pressed to the bottom of the tower, causing bumping.
1. High gas-phase load； 2. Changes in raw material components ； 3. Large variation in bottom temperature of the tower ； 4. Large variations in processing volume ； 5. Low return flow ；
(1) The feed volume suddenly increases. (2) Top-loop interrupt. (3) The raw material has severe moisture content. (4) Sudden increase in steam volume. (5) High bottom temperature and low liquid level. (6) The temperature of the reaction oil vapor is too high...
1) The coking amount in the coke tower is too high, and foamy coke is carried to the bottom of the distillation tower. 2) The steam injection volume into the heating furnace is too high. 3) Improper operation of the distillation tower results in local gas velocities and liquid loads exceeding normal levels. 4) Tray coking or downcomer blockage. 5) The liquid level at the bottom of the distillation tower is too high, exceeding the oil and gas inlet. 6) Water carried back in the reflux stream. 7) The oil in the coke tower was not completely removed, and it vaporized instantly after the tower was changed, causing pressure surges in the tower.
(1) Failure of the liquid level at the bottom of the tower, resulting in an excessively high liquid level； (2) Improper operation: excessive light oil was pressed to the bottom of the tower, causing bumping ； (3) Top reflux interruption ； (4) The temperature gauge at the reboiler outlet lost control, resulting in the outlet...
The coking amount in the coke tower is too high, and the foamy coke is carried to the bottom of the distillation tower. The steam injection volume into the heating furnace is too high. Improper operation of the distillation tower results in local gas velocities and liquid loads exceeding normal levels. The liquid level at the bottom of the distillation tower is too high, exceeding the oil and gas inlet. Backflow brings water. The oil in the coke tower was not completely removed; upon tower replacement, it vaporized instantly and rushed back into the tower.