Reasons for the high hydrogen-chlorine pressure difference alarm in the Asahi Kasei ion-exchange membrane electrolyzer
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This post was last edited by sunjl1981 on 2013-1-6 at 23:25. Our plant suddenly experienced excessive hydrogen pressure, which led to a high pressure difference alarm and subsequent automatic shutdown. Please advise on the possible causes: loveliness: This post was last edited by yzhms on 2008-3-5 at 22:02. ] # ， ， &
In most cases, there is water accumulation inside the hydrogen pipeline; we have encountered this several times. The specific manifestations are as follows: 1. When the water volume inside the pipe has not reached a certain level, there is no reaction, and the pressure remains stable ； 2. When water accumulates to a certain level, hydrogen pressure rises suddenly; the control valve opens to its maximum position, and the pressure difference can no longer be maintained, resulting in shutdown ； 3. It was finally found that the drain valve of the liquid seal had been closed; after it was opened, a large amount of water flowed out ； 4. Now that drainage has been ensured, everything is normal. This post was last edited by yzhms on 2008-3-6 12:19.]
Agree with what was said on floor 2. Our factory used to experience tripping due to high differential pressure while the equipment was in operation, but after installing drainage devices at the lower points of the pipelines, this problem no longer occurs almost at all.
Our factory has encountered situations in winter where pressure transmitters froze, and there have also been cases where control valves failed to function properly
Isn’t there already a drain valve from the hydrogen main pipe to the hydrogen treatment section? It shouldn’t be that reason; the original poster didn’t provide specific details about the situation. There are many reasons for high pressure differences, but you didn’t describe what was going on at the time!
The hydrogen pressure might be too high; there could also be some issues with the hydrogen treatment process, such as problems with the fans used for hydrogen treatment, etc. Valve failures are another possibility (the probability isn’t high, but it’s still possible)
In winter, water inside the pipes freezes, causing blockages; once the weather warms up, the ice melts, which leads to a sudden increase in gas pressure and results in a shutdown of the system.
It’s also possible that high temperatures increase the hydrogen pressure, and the valves are unable to adjust promptly, resulting in a high pressure difference
I agree with what was said on the 2nd floor. Our factory has encountered two other problems as well: 1. Scaling and blockage of the water seal overflow pipe in the hydrogen chimney, which caused the water level in the seal to rise too high, leading to an over-limit condition； 2. An error in the pressure display instrument of the hydrogen main pipe caused a trip.
Thank you all for your help. Let me explain the situation: after parking, we didn’t do anything special; it was possible to start the vehicle again, and the pressure was normal. We increased the delay time before the pressure differential trigger caused the shutdown. It was found that in most cases the pressure remained normal, with the maximum pressure differential being 6.3 and the minimum 3.5, and these differences lasted only a few seconds at most. This issue occurred once during a single shift, and to this day the cause remains unknown. Now, the outdoor temperature here has risen again, so there is no freezing
I completely agree with you; our company has strict requirements and schedules regular drainage of the entire hydrogen system. :handshake
Automatic drainage can be considered, provided that regular inspections are carried out to ensure safe and stable production.