【Daily Question】1.10 Short-answer question: How to adjust low yields of vacuum distillate oil?
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This post was last edited by Catalyzing a Grain on 2016-1-18 08:36. If your insights are very long, please participate in the event to win great prizes! ! ! ! Year-end event – “HaiChuan Gratitude Season” – Custom title. [Petroleum and Chemicals Section] Thread: http://bbs.hcbbs.com/thread-1532394-1-1.html If you have any thoughts or feelings to share, come here and let’s chat about them! ! ! ! Gratitude Stories — My Experience with My Master: A Prize-Winning Contest (Reply for +50 Wealth Points) http://bbs.hcbbs.com/thread-1530494-1-1.html Brief question: How can low yields of vacuum distillate oil be improved? Increase the vacuum level of the tower; reduce high temperatures in the coolers used for top oil removal, high temperatures at the top of the vacuum tower, high feed temperatures or changes in the feed composition; increase the amount of steam used for stripping; keep the liquid level at the bottom of the tower low, as well as the liquid level in the oil-water separation tank used for top oil removal; address any faults in the vacuum system. Correct: +2; In-depth discussion: +5 @ Guan Gongyu
Teacher, I hope to receive valuable advice on these issues; I am extremely grateful.
Increase the vacuum level, raise the temperature at the furnace outlet, and increase the steam injection at the bottom of the tower to boost the partial pressure of oil and gas
The feed to the vacuum distillation tower consists of the heavier fractions of crude oil. Vacuum distillation is used to separate these heavier fractions into various distillates. Whether these distillates are intended to be used as feedstock for cracking or as raw materials for lubricants, it is important to maximize the yield, provided that they meet the specified quality standards. Improving the yield should be based on qualified quality. If the yield is low, the following methods can be adopted: ① Increase the vacuum level of the tower. It can reduce the temperature of the cooled fluid in the condensers at each stage of pressure reduction. Systems equipped with multiple stages and numerous injectors allow for an increase in the number of injectors used. If some injectors are not functioning properly, such as when there is steam leakage, efforts should be made to adjust them so that they can operate efficiently and fully utilize their capabilities. ②Appropriately increase the outlet temperature of the vacuum furnace, raise the amount of steam used for stripping at the bottom of the tower, and improve the vaporization rate of the oil. ③Ensuring an optimal distribution of the product and a proper ratio of heat recovery from the intermediate stage helps to prevent excessive pressure drops on certain trays within the tower, thereby increasing the vacuum level in the vaporization section and boosting the yield of distillate oil. An effective distillation process also allows heavier components to end up in the distillate oil, further increasing the overall product yield.
The feed to the vacuum distillation tower consists of the heavier fractions of crude oil. Vacuum distillation is used to separate these heavier fractions into various distillates. Whether these distillates are intended to be used as feedstock for catalytic cracking or as lubricant ingredients, it is important to maximize the yield, provided that they meet the specified quality standards. Increasing the yield should be based on qualified quality. If the yield is low, the following methods can be adopted: (1) Increase the vacuum level of the tower. It can reduce the temperature of the condensers at various stages at the top of the vacuum tower after cooling. Systems equipped with multiple stages and numerous injectors allow for an increase in the number of injectors used. For those injectors that are not functioning properly (for example, in cases of steam leakage), efforts are made to adjust them so that they can operate effectively. (2) Appropriately increase the outlet temperature of the vacuum furnace, raise the amount of stripping steam at the bottom of the tower, and increase the vaporization rate of the oil. (3) Optimize the product distribution and the proportion of heat recovery from the mid-section reflux, so as to prevent excessive local plate pressure drops in the tower, increase the vacuum level in the vaporization section, thereby raising the yield of distillate oil. Improve the distillation efficiency of the tower by allowing heavier components to enter the distillate oil, thus increasing the overall product yield.
The vacuum level is insufficient, or the temperature at the outlet of the vacuum furnace is low
1. Reduce the temperature of the cooled fluid in the condensers at various stages; for systems equipped with multiple injectors, it is possible to increase the number of injectors in use, and adjustments can be made to those injectors that are not functioning properly in order to increase the vacuum level during degassing. 2. Increase the vaporization rate of the oil. 3. Prevent excessive pressure drops on certain trays within the tower, thereby increasing the vacuum level in the vaporization section and boosting the yield of distillate oil
1. Reduce the temperature of the cooled fluid in the condensers at various stages of pressure reduction; in systems equipped with multiple injectors, more injectors can be added, and those that are not functioning properly can be adjusted to increase the vacuum level during pressure reduction. 2. The goal is to improve the vaporization rate of the oil. 3. The aim is to prevent excessive pressure drops on certain trays within the tower, thereby increasing the vacuum level in the vaporization section and boosting the yield of distillate oil
Improving the yield must be based on qualified quality. 1. Increase the vacuum level of the tower, adjust the temperature after cooling in each condenser, the steam pressure, the number of ejectors, and the mechanical vacuum pump. 2. Slightly increase the furnace outlet temperature, raise the steam injection volume at the bottom of the tower, and improve the gasification rate of the oil. 3. Optimize the distribution of the product and the proportion of heat removal in each reflux stream, so as to prevent excessive pressure drops on certain trays within the tower, increase the vacuum level in the vaporization section, raise the yield of distillate oil, improve the distillation efficiency of the tower, and ensure that heavier components end up in the distillate oil, thereby increasing the overall product yield.
The feed to the vacuum distillation tower consists of the heavier fractions of crude oil. Vacuum distillation is used to separate these heavier fractions into various distillates. Whether these distillates are intended to be used as feedstock for cracking or as raw materials for lubricants, it is important to maximize the yield, provided that they meet the specified quality standards. Improving the yield should be based on qualified quality. If the yield is low, the following methods can be adopted: ① Increase the vacuum level of the tower. It can reduce the temperature of the cooled fluid in the condensers at each stage of pressure reduction. Systems equipped with multiple stages and numerous injectors allow for an increase in the number of injectors used. If some injectors are not functioning properly, such as when there is steam leakage, efforts should be made to adjust them so that they can operate efficiently and fully utilize their capabilities. ②Appropriately increase the outlet temperature of the vacuum furnace, raise the amount of steam used for stripping at the bottom of the tower, and improve the vaporization rate of the oil. ③Optimize the distribution of the product and the proportion of heat recovery from the mid-section, so as to prevent excessive pressure drops on individual trays within the tower; this increases the vacuum level in the vaporization section, thereby raising the yield of distillate oil. Improving the distillation efficiency of the tower allows heavier components to end up in the distillate oil, further increasing the product yield.
1. Low vacuum level 2. Low temperature at the furnace outlet 3. Reduced processing load 4. Changes in the gas injection rate at the bottom of the tower 5. Changes in the properties of the crude oil 6. Excessively high distillation yield at atmospheric pressure