[Q&A Question 080] 2017.03.21
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This post was last edited by 955559 on 2017-7-21 22:31. [Q&A Question No. 080] March 21, 2017: What are the reasons for high PSA exhaust emission pressure? 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.) ) It may be due to sticking of the programmable valve, internal leakage, or improper operation of the switch. Summary thread of Q&A questions from 2017 (starting to be updated): http://bbs.hcbbs.com/thread-1657793-1-1.html Summary thread of daily questions from 2017 (starting to be updated): http://bbs.hcbbs.com/thread-1657794-1-1.html Summary thread of Q&A questions from 2016 (already updated): http://bbs.hcbbs.com/thread-1597792-1-1.html Third-phase selection for outstanding management members at HaiChuan: http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: HaiChuan Chemicals Forum)
There are many ways to equalize pressure in nitrogen generators, and basically each manufacturer uses a different method for this purpose. The commonly used types are 9-valve or 11-valve, with pressure equalization methods of top–top, top–middle, and middle–bottom. Pressure equalization refers to the recovery of nitrogen from the gaps in the CMS carbon molecular sieve. Backblowing and pressure equalization are not the same thing; backblowing is a regeneration process in which high-quality nitrogen is used to remove the impurities adsorbed.
The adsorption time is too short, resulting in low absorption efficiency of the adsorbent.
The possible cause, as analyzed, is internal leakage in the programmable valve or improper operation of the switch.
Exhaust control valve, manual valve has limited range, high regeneration pressure, large processing volume, abnormal pressure gauge reading!
For various hydrogenation units, the fate of the exhaust gases varies. Excluding external factors such as increased pressure in the exhaust gas network, high exhaust gas pressure indicates that the adsorption and regeneration time settings during the pressure swing adsorption process are not appropriate. If the emission time is too short and hydrogen is not fully removed, the regeneration step is reached, resulting in excessive pressure in the exhaust gas being flushed out, which in turn affects the exhaust pressure.
For various hydrogenation units, the fate of the exhaust gases varies. Excluding external factors such as increased pressure in the exhaust gas network, high exhaust gas pressure indicates that the adsorption and regeneration time settings during the pressure swing adsorption process are not appropriate. If the emission time is too short and hydrogen is not fully removed, the regeneration step is reached, resulting in excessive pressure in the exhaust gas being flushed out, which in turn affects the exhaust pressure.
Internal leakage in the PSA programmable valve; low opening degree of the converter purge gas manual valve
There may be sticking, internal leakage, or improper operation of the programmable valve