【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 058
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【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 058: What are the factors that affect the pressure at the top of an atmospheric pressure tower? The main factors affecting the pressure at the top of an atmospheric pressure tower are: 1. The outlet temperature of the stable reboiler (or feed heater) ； 2. Stabilize the liquid level at the bottom of the stabilizer tower and stabilize the feed rate ； 3. Changes in weather conditions, with human-induced suppression of the top temperature ； 4. Fluctuations in top temperature: identify the cause and make adjustments accordingly ； 5. Reflux cooling effect: identify the cause and take measures to control it ； 6. If the reflux distillation control gauge or pressure control valve is not working properly, contact someone for repairs. (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
Feed composition, bottom temperature of the tower, reflux ratio
Changes in furnace temperature, changes in the properties of crude oil, water content in the crude oil or the reflux stream, changes in feed rate, blockages in the vent lines at the top of the tower, and changes in the amount of gas blown in.
Changes in the top of the tower temperature; unstable temperature of the tower gasoline after cooling； Changes in top reflux and mid-section reflux ； Backflow water carryover ； Changes in stripping volume or water carried away by stripping
Feed flow rate and temperature, heat removal in the middle section, top reflux temperature and flow rate, feed composition
1. Stable outlet temperature of the reboiler (or feed heater)； 2. Stabilize the liquid level at the bottom of the stabilizer tower and stabilize the feed rate ； 3. Changes in weather conditions, with human-induced suppression of the top temperature ； 4. Fluctuations in top temperature: identify the cause and make adjustments accordingly ； 5. Reflux cooling effect: identify the cause and take measures to control it ； 6. If the reflux distillation control gauge or pressure control valve is not working properly, contact someone for repairs.
1. Temperature after cooling at the top of the tower； 2. Feed rate ； 3. Return flow rate
1) Changes in the top temperature of the tower, unstable temperature of the tower gasoline after cooling; 2) Changes in the top reflux and mid-stage reflux; 3) Water carried over in the reflux stream; 4) Changes in the stripping volume or water carried over during stripping; 5) Changes in the properties of the feed material
①, the composition of the raw materials. ②Temperature changes of the cooled top product. ③, Pressure control system failure ④, Significant fluctuations in the bottom temperature of the tower. ⑤The tower system being full causes pressure
1. Stabilize the outlet temperature of the reboiler； 2. Feed rate to the stabilizer tower, bottom liquid level ； 3. Top temperature fluctuations ； 4. Backflow cooling effect
1) Changes in the outlet temperature of the atmospheric pressure furnace; (2) Changes in the properties of crude oil or vacuum residue; (3) Water content in crude oil; (4) Water carried back in the tower top reflux stream; (5) Changes in the feed rate and blockage of the tower top gas discharge pipe; (6) Changes in the steam injection amount