[Q&A Question 150] 2018.05.30
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【Q&A Question 150】May 30, 2018: Briefly describe the causes, symptoms, and treatment methods for excessively high system pressure Reason: ① Failure of the thermal low-pressure control or too small an opening, resulting in too low an emission volume ； ②Raw oil contains water ； Phenomenon: ① The outlet pressure of the new hydrogen compressor increases, and the pressure of the hot low-pressure fraction rises. ②The indications for oil level and fresh hydrogen level are decreasing. Treatment methods: ① Increase the flow rate of low-pressure gas to the gasoline hydrogenation unit; if the pressure cannot be reduced, slightly open the emergency vent while checking for faults. ② If water is present in the feed oil, enhance the dehydration process, keeping the temperature at the furnace outlet unchanged. (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 skills competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
Reason: High reactor pressure drop； External gas flow is blocked ； Pressure transmitter failure
This post was last edited by Zhu Hansheng_VXMI on 2018-5-30 at 10:42. Hydrogen gas was not removed in a timely manner, resulting in high pressure in the new hydrogen pipeline network; the pressure ratio of the new hydrogen compressor was not adjusted promptly. The amount of hydrogen required by the system decreased, and there was also water present in the raw material, which increased the steam partial pressure and thus elevated the pressure in some parts of the system
Reason: ① Failure of the thermal low-pressure control or too small an opening, resulting in too low an emission volume； ②Raw oil contains water ； Phenomenon: ① The outlet pressure of the new hydrogen compressor increases, and the pressure of the hot low-pressure fraction rises. ②The indications for oil level and fresh hydrogen level are decreasing. Treatment methods: ① Increase the flow rate of low-pressure gas to the gasoline hydrogenation unit; if the pressure cannot be reduced, slightly open the emergency vent while checking for faults. ② If water is present in the feed oil, enhance the dehydration process, keeping the temperature at the furnace outlet unchanged.
Reason: ① Failure of the thermal low-pressure control or too small an opening, resulting in too low an emission volume； ②Raw oil contains water ； Phenomenon: ① The outlet pressure of the new hydrogen compressor increases, and the pressure of the hot low-pressure fraction rises. ②The indications for oil level and fresh hydrogen level are decreasing. Treatment methods: ① Increase the flow rate of low-pressure gas to the gasoline hydrogenation unit; if the pressure cannot be reduced, slightly open the emergency vent while checking for faults. ② If water is present in the feed oil, enhance the dehydration process, keeping the temperature at the furnace outlet unchanged.
The control system of the new hydrogen compressor failed; the pressure alarm safety valve activated, and the relief valve was opened to release pressure. The cause was identified.
Reason: 1. Failure of the thermal low-pressure control or too small an opening angle, resulting in too low an emission volume； 2. Raw oil contains water ； Phenomenon: 1. The outlet pressure of the new hydrogen compressor increases, and the pressure of the hot low-pressure fraction rises as well. 2. The indications for oil level and fresh hydrogen level decrease. Solution: 1. Increase the flow of low-pressure gas to the gasoline hydrogenation unit; if the pressure cannot be reduced, slightly open the emergency vent while checking for the fault. 2. If it is found that the crude oil contains water, enhance dehydration while keeping the furnace outlet temperature unchanged.
Reason: ① Failure of the thermal low-pressure control or too small an opening, resulting in too low an emission volume； ②Raw oil contains water ； Phenomenon: ① The outlet pressure of the new hydrogen compressor increases, and the pressure of the hot low-pressure fraction rises. ②The indications for oil level and fresh hydrogen level are decreasing. Treatment methods: ① Increase the flow rate of low-pressure gas to the gasoline hydrogenation unit; if the pressure cannot be reduced, slightly open the emergency vent while checking for faults. ② If water is present in the feed oil, enhance the dehydration process, keeping the temperature at the furnace outlet unchanged.
The content of unsaturated hydrocarbons in the raw material is low, and the solution is to adjust this by reducing the amount of hydrogen used.
Reason: ① Failure of the thermal low-pressure control or too small an opening, resulting in too low an emission volume； ②Raw oil contains water ； Phenomenon: ① The outlet pressure of the new hydrogen compressor increases, and the pressure of the hot low-pressure fraction rises. ②The indications for oil level and fresh hydrogen level are decreasing. Treatment methods: ① Increase the flow rate of low-pressure gas to the gasoline hydrogenation unit; if the pressure cannot be reduced, slightly open the emergency vent while checking for faults. ② If water is present in the feed oil, enhance the dehydration process, keeping the temperature at the furnace outlet unchanged.