【Q&A Question 102】April 12, 2017
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【Q&A Question 102】April 12, 2017: What are the phenomena associated with a decrease in the amount of new hydrogen? The reference answer can be seen after responding; points will be awarded if the key points are answered correctly. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) When the hydrogen consumption exceeds the rate at which new hydrogen is supplied, the flow rate of new hydrogen indicates a low level, and the system pressure drops. Scoring criteria: 2 Wealth points for incorrect responses; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by detailed explanations; responses that are correct but lack sufficient details earn 15–20 Wealth points. Please score according to these criteria. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) 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 (sponsors sought; highest returns ever) http://bbs.hcbbs.com/thread-1666758-1-1.html Sponsors are being sought for this campaign; those interested can contact the event organizer. (Sponsors of the event are entitled to the policy allowing them to include promotional ads as sponsors in various events held in the petrochemical region for one year.) The Petrochemical Deep Processing Edition – the event to share pictures of chemical equipment has begun! Huge amounts of wealth, as well as HChuan coins, are waiting for you to claim them: http://bbs.hcbbs.com/thread-1760733-1-1.html. Notice regarding the collection of chemical engineering technical materials in the “Petroleum and Chemicals Section”: http://bbs.hcbbs.com/thread-1614796-1-1.html (Source: HChuan Chemical Forum)
When the hydrogen consumption exceeds the rate at which new hydrogen is supplied, the flow rate of new hydrogen indicates a low level, and the system pressure drops.
Hydrogen consumption exceeds the rate at which new hydrogen is supplied; the flow rate of new hydrogen indicates a low level, and system pressure drops
The reaction pressure decreases, the reaction temperature rises significantly, and the purity of the recycle hydrogen decreases
Phenomenon: ① The outlet pressure indication of the new hydrogen compressor decreases. ②System pressure drops.
The reaction pressure drops rapidly, the compressor outlet temperature rises, and the backflow valve is closed to a smaller degree.
It is not conducive to the determination of reaction heat, leading to an increase in bed temperature； It is unfavorable for the hydrogenation reaction, accelerates the rate of carbon deposition on the catalyst, and can even lead to rapid deactivation of the catalyst.
When the hydrogen consumption exceeds the rate at which new hydrogen is supplied, the pressures at various stages of the new hydrogen compressor decrease, the system pressure drops, and the compressor emits audible and visual alarms or even shuts down
When the hydrogen consumption exceeds the rate at which new hydrogen is supplied, the flow rate of new hydrogen indicates a low level, and the system pressure drops.
Answer: The hydrogen partial pressure decreases, the system pressure drops, the amount of recycled hydrogen returning through the bypass decreases, and the purity of the recycled hydrogen declines.