[Q&A Question 214] 2018.08.08
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【Q&A Question 214】August 8, 2018: Briefly describe the factors that cause foam entrainment ①Empty tower gas velocity ； ②tray spacing ； ③Plate structure ； ④Surface tension of liquids. (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. Vertical velocity of steam； 2. Tower-shaped plate 3. Plate spacing 4. Liquid surface tension
In the operation of a plate distillation column, as the vapor rising inside the column passes through the liquid layer on the plates and bubbles upward, its kinetic energy causes it to carry some liquid droplets along with it. When the gravitational force on these liquid droplets overcomes the kinetic energy of the gas flow, they return to the plates; however, when the kinetic energy of the rising gas flow is greater than the gravity of the droplets, they are carried to the next higher plate. This phenomenon is known as mist entrainment. The amount of mist entrained has a significant impact on distillation; mist entrainment causes liquids with lower volatility to mix into those with higher volatility, thereby reducing the efficiency of the tower trays. The general specification is a mist entrainment amount of 10% (0.1 kg/kg of steam). Use this to determine the upper limit of the steam load and the required tower diameter. Factors affecting the amount of mist entrainment include the vertical velocity of the steam, the type of tray, the tray spacing, and the surface tension of the liquid.
①Empty tower gas velocity； ②tray spacing ； ③Plate structure ； ④Surface tension of liquids.
Factors affecting the amount of mist entrainment include the vertical velocity of the steam, the type of tray, the tray spacing, and the surface tension of the liquid.
①Empty tower gas velocity； ②tray spacing ； ③Plate structure ； ④Surface tension of liquids.
In the operation of a plate distillation column, as the vapor rising inside the column passes through the liquid layer on the plates and bubbles upward, its kinetic energy causes it to carry some liquid droplets along with it. When the gravitational force on these liquid droplets overcomes the kinetic energy of the gas flow, they return to the plates; however, when the kinetic energy of the rising gas flow is greater than the gravity of the droplets, they are carried to the next higher plate. This phenomenon is known as mist entrainment. The amount of mist entrained has a significant impact on distillation; mist entrainment causes liquids with lower volatility to mix into those with higher volatility, thereby reducing the efficiency of the tower trays. The general specification is a mist entrainment amount of 10% (0.1 kg/kg of steam). Use this to determine the upper limit of the steam load and the required tower diameter. Factors affecting the amount of mist entrainment include the vertical velocity of the steam, the type of tray, the tray spacing, and the surface tension of the liquid.
In the operation of a plate distillation column, as the vapor rising inside the column passes through the liquid layer on the plates and bubbles upward, its kinetic energy causes it to carry some liquid droplets along with it. When the gravitational force on these liquid droplets overcomes the kinetic energy of the gas flow, they return to the plates; however, when the kinetic energy of the rising gas flow is greater than the gravity of the droplets, they are carried to the next higher plate. This phenomenon is known as mist entrainment. The amount of mist entrained has a significant impact on distillation; mist entrainment causes liquids with lower volatility to mix into those with higher volatility, thereby reducing the efficiency of the tower trays.
In the operation of a plate tower, when the rising gas leaves the bubbling liquid layer on the tray, the bubbles burst, causing some of the liquid to be splashed into many small droplets and mist. When the empty-tower velocity of the rising gas exceeds a certain limit, these droplets and mist are carried upward to the upper trays by the gas in large quantities; this phenomenon is known as mist entrainment. The influencing factors include the empty tower gas velocity, tray spacing, and the heat exchange area of the reboiler.
①Empty tower gas velocity； ②tray spacing ； ③Plate structure ； ④Surface tension of liquids.
The influencing factors include the empty tower gas velocity, tray spacing, and the heat exchange area of the reboiler