[Q&A Question 194] 2017.07.13
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This post was last edited by liuquan1100 on 2017-8-7 21:43. [Q&A Question 194] What are the reasons for the increase in pressure drop in the reaction system on 2017.07.13? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Note: For questions of the type \"one question per day,\" if a person replies continuously for a month, that is, posts more than 30 times, their score will be assigned as 2 points, which is the lowest possible score. Click once to reply; if multiple replies are made, points will be awarded as appropriate, as deleting posts is also a waste of time. ①Increase in catalyst bed pressure drop ； ②Systemic ammonium salt crystallization ； ③Coking of the reactor tube ； ④Scoring criteria for scaling in high-pressure heat exchangers: 2 wealth points for incorrect answers; 3–8 points for *incomplete* answers. 10 wealth points for correct answers, with a detailed explanation; 15–20 wealth points if the answer is correct but lacks sufficient details. Please use these criteria for scoring. Note: If there are editing records after answering, only those who participated will be given points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Saving” Campaign (Phase 2 is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
High air velocity, large amount of recycled hydrogen, heat exchanger blockage, air cooler blockage, catalyst fouling, catalyst bed collapse, catalyst coking
Answer: 1. Coking blockage 2. Ammonium salt deposition 3. Erosion due to scouring by heat exchanger baffles 4. Catalyst carbon deposition and excessive dust
1. Influence of raw material properties； 2. Impact of cyclic hydrogen flow fluctuations ； 3. Impact of low hydrogen oil ratio ； 4. Impact of frequent start-stop operations ； 5. Catalyst caking in the reactor, failures of tower internals, etc.
Carbon deposition in the reactor, coking of the furnace tubes, as well as the accumulation of Fes, ammonium salts, and coke, all lead to blockages in the feed heat exchangers and air coolers
1\ Catalyst crushing 2\ Carbon deposition at the top of the reactor and in the pipelines 3\ Deposition of solid particles at the top of the catalyst bed
1\ Catalyst crushing 2\ Carbon deposition at the top of the reactor and in the pipelines 3\ Deposition of solid particles at the top of the catalyst bed
1\ Catalyst crushing 2\ Carbon deposition at the top of the reactor and in the pipelines 3\ Deposition of solid particles at the top of the catalyst bed
Increase in catalyst bed pressure drop, ammonium salt crystallization in the system, coking of the reactor tubes, and scaling in the high-pressure heat exchanger
1. Increased catalyst fouling 2. System clogging 3. Catalyst fragmentation 4. Significant increase in recycled hydrogen volume
Scaling at the top of the reactor, catalyst coking, and local collapse of the bed.