【Q&A Question 149】2018.05.29
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【Q&A Question 149】May 29, 2018: Briefly describe what abnormal phenomena can occur on the lower tray How to prevent it? Common abnormal phenomena in towers include flooding (i.e., liquid flooding), excessive mist entrainment, and leakage (i.e., vapor escape). Once these phenomena occur, they affect product quality and yield, and may even disrupt the entire distillation process. Methods to prevent this include: ① In terms of design, it is necessary to ensure a rational structure ； ②Quality must be ensured during installation ； ③During maintenance, it must be thoroughly cleaned; when reinstalling after maintenance, strict quality control is required ； ④Operating beyond the tower’s elastic range is strictly prohibited; the feed rate, reflux ratio, temperature, and pressure must all be maintained at stable levels. (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. The APP short-video skill competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
Flooded tower, flushed tower, dry plate, crystalline blockage
Common abnormal phenomena in towers include flooding (i.e., liquid flooding), excessive mist entrainment, and leakage (i.e., vapor escape). Once these phenomena occur, they affect product quality and yield, and may even disrupt the entire distillation process. Therefore, every effort must be made to prevent these phenomena from occurring. Prevention methods include: First, the design must ensure a rational structure (for example, the opening ratio of the trays, the area of the overflow pipes, the spacing between plates, the height of the weirs, the weight of the valves, and the selection of the linear velocity inside the tower all need to meet the required standards) ； Second, quality must be ensured during installation (such as the verticality of the tower, the levelness of the tray, the height of the liquid distribution plate, and the flexibility of the floating valve, etc.) ； Third, it must be thoroughly cleaned during maintenance, and strict quality control must be applied during installation after the repairs ； Fourth, in terms of operation, it is strictly prohibited to operate outside the elastic range of the tower. The feed rate, reflux ratio, temperature, and pressure must all be kept stable to avoid significant fluctuations.
Common abnormal phenomena in towers include flooding (i.e., liquid flooding), excessive mist entrainment, and leakage (i.e., vapor escape). Once these phenomena occur, they affect product quality and yield, and may even disrupt the entire distillation process. Therefore, every effort must be made to prevent these phenomena from occurring. Prevention methods include: First, the design must ensure a rational structure (for example, the opening ratio of the trays, the area of the overflow pipes, the spacing between plates, the height of the weirs, the weight of the valves, and the selection of the linear velocity inside the tower all need to meet the required standards) ； Second, quality must be ensured during installation (such as the verticality of the tower, the levelness of the tray, the height of the liquid distribution plate, and the flexibility of the floating valve, etc.) ； Third, it must be thoroughly cleaned during maintenance, and strict quality control must be applied during installation after the repairs ； Fourth, in terms of operation, it is strictly prohibited to operate outside the elastic range of the tower. The feed rate, reflux ratio, temperature, and pressure must all be kept stable to avoid significant fluctuations.
Common abnormal phenomena in towers include flooding (i.e., liquid flooding), excessive mist entrainment, and leakage (i.e., vapor escape). Once these phenomena occur, they affect product quality and yield, and may even disrupt the entire distillation process. Therefore, every effort must be made to prevent these phenomena from occurring. Prevention methods include: First, the design must ensure a rational structure (for example, the opening ratio of the trays, the area of the overflow pipes, the spacing between plates, the height of the weirs, the weight of the valves, and the selection of the linear velocity inside the tower all need to meet the required standards) ； Second, quality must be ensured during installation (such as the verticality of the tower, the levelness of the tray, the height of the liquid distribution plate, and the flexibility of the floating valve, etc.) ； Third, it must be thoroughly cleaned during maintenance, and strict quality control must be applied during installation after the repairs ； Fourth, in terms of operation, it is strictly prohibited to operate outside the elastic range of the tower. The feed rate, reflux ratio, temperature, and pressure must all be kept stable to avoid significant fluctuations.
1. Phenomena: Common abnormal phenomena in ordinary towers include tower flooding (i.e., liquid flooding), excessive mist entrainment, and leakage (i.e., vapor escape). Once these phenomena occur, they affect product quality and yield, and may even disrupt the entire distillation process. Therefore, every effort must be made to prevent these phenomena from occurring. 2. Measures to prevent this include: First, the design must ensure a rational structure (for example, the opening ratio of the trays, the area of the overflow pipes, the spacing between plates, the height of the weirs, the weight of the valves, and the selection of the linear velocity inside the tower all need to meet the required standards) ； Second, quality must be ensured during installation (such as the verticality of the tower, the levelness of the tray, the height of the liquid distribution plate, and the flexibility of the floating valve, etc.) ； Third, it must be thoroughly cleaned during maintenance, and strict quality control must be applied during installation after the repairs ； Fourth, in terms of operation, it is strictly prohibited to operate outside the elastic range of the tower. The feed rate, reflux ratio, temperature, and pressure must all be kept stable to avoid significant fluctuations.
Common abnormal phenomena in towers include tower flooding, excessive mist entrainment, and leaks. Prevention methods include: 1) Ensuring a rational structure in the design ； 2) Quality must be ensured during installation ； 3) Thorough cleaning is required during maintenance, and strict quality control must be applied during installation after maintenance ； 4) It is strictly prohibited to operate beyond the elastic range of the tower; the feed rate, reflux ratio, temperature, and pressure must be kept stable.
Common abnormal phenomena in towers include flooding (i.e., liquid flooding), excessive mist entrainment, and leakage (i.e., vapor escape). Once these phenomena occur, they affect product quality and yield, and may even disrupt the entire distillation process. Therefore, every effort must be made to prevent these phenomena from occurring. Prevention methods include: First, the design must ensure a rational structure (for example, the opening ratio of the trays, the area of the overflow pipes, the spacing between plates, the height of the weirs, the weight of the valves, and the selection of the linear velocity inside the tower all need to meet the required standards) ； Second, quality must be ensured during installation (such as the verticality of the tower, the levelness of the tray, the height of the liquid distribution plate, and the flexibility of the floating valve, etc.) ； Third, it must be thoroughly cleaned during maintenance, and strict quality control must be applied during installation after the repairs ； Fourth, in terms of operation, it is strictly prohibited to operate outside the elastic range of the tower. The feed rate, reflux ratio, temperature, and pressure must all be kept stable to avoid significant fluctuations.
1. Foam entrainment, lighter feed composition, excessively high bottom temperature, fluctuations in tower pressure, increased gas-phase load, and too rapid rising velocity； 1. Stable feed composition and timely adjustment of the bottom temperature of the tower. 2. Tower flooding, a severe form of foam entrainment. 3. Liquid leakage; an increase in the feed composition, too low a bottom temperature, or excessive liquid load – in such cases, reduce the reflux rate to adjust the bottom temperature. 4. Severe tower flooding, a more extreme form of liquid leakage. 5. Dry tray: no liquid on the tray, resulting in no distillation taking place
1. Phenomena: Common abnormal phenomena in ordinary towers include tower flooding (i.e., liquid flooding), excessive mist entrainment, and leakage (i.e., vapor escape). Once these phenomena occur, they affect product quality and yield, and may even disrupt the entire distillation process. Therefore, every effort must be made to prevent these phenomena from occurring. 2. Measures to prevent this include: First, the design must ensure a rational structure (for example, the opening ratio of the trays, the area of the overflow pipes, the spacing between plates, the height of the weirs, the weight of the valves, and the selection of the linear velocity inside the tower all need to meet the required standards) ； Second, quality must be ensured during installation (such as the verticality of the tower, the levelness of the tray, the height of the liquid distribution plate, and the flexibility of the floating valve, etc.) ； Third, it must be thoroughly cleaned during maintenance, and strict quality control must be applied during installation after the repairs ； Fourth, in terms of operation, it is strictly prohibited to operate outside the elastic range of the tower. The feed rate, reflux ratio, temperature, and pressure must all be kept stable to avoid significant fluctuations.
Common abnormal phenomena in towers include flooding (i.e., liquid flooding), excessive mist entrainment, and leakage (i.e., vapor escape). Once these phenomena occur, they affect product quality and yield, and may even disrupt the entire distillation process. Therefore, every effort must be made to prevent these phenomena from occurring. Prevention methods include: First, the design must ensure a rational structure (for example, the opening ratio of the trays, the area of the overflow pipes, the spacing between plates, the height of the weirs, the weight of the valves, and the selection of the linear velocity inside the tower all need to meet the required standards) ； Second, quality must be ensured during installation (such as the verticality of the tower, the levelness of the tray, the height of the liquid distribution plate, and the flexibility of the floating valve, etc.) ； Third, it must be thoroughly cleaned during maintenance, and strict quality control must be applied during installation after the repairs ； Fourth, in terms of operation, it is strictly prohibited to operate outside the elastic range of the tower. The feed rate, reflux ratio, temperature, and pressure must all be kept stable to avoid significant fluctuations.