How is pressure swing adsorption operated in this case?
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Our plant is a synthetic ammonia facility with an annual production capacity of 40,000 tons, and it has newly installed a PSA decarburization unit with a processing capacity of 2,400 m3/h. There are a total of 8 adsorption towers, numbered A, B, C, D, E, G, H, and I. Yesterday, due to a faulty solenoid valve in tower E, it was removed from the operation interface; as required, the operation procedure was switched to one that involves 7 towers. However, the following problems arose: the adsorption pressure was extremely unstable, and after a few minutes of operation, the solenoid valves began to operate erratically. Please help, experts! What is causing this, and how should I proceed? Note: This technology is from Sichuan Tianyi. This post was last edited by lsx-tzq on 2008-2-27 08:35.]
It’s probably because the Cheta program isn’t ready. Before putting it into operation, self-check procedures should be carried out to test all kinds of issues that may arise during use.
It can basically be considered a problem with the control program; it’s possible that there’s an error in the Cheta program. Running the program on a computer for simulation can make it easier to diagnose the issue.
How long has it been? If the time is limited, you can consider asking Tianyi directly for the service; it would be best if the service meets your expectations. If the service is not satisfactory and the waiting time is long, you can turn to other companies; these services are usually paid. For example, Chengdu Aidenuo Chemical Technology Company, at 028-87797522. You can also inquire about local clients, such as Yongnian Fertilizer Factory, at 0310-6862876. If nothing else works, send me a message.
Yes, what the guys upstairs said is correct; it’s mainly a problem with the program switching – contact Tianyi directly! Request an engineer to arrive and resolve it! Or send the debugging steps so I can debug it myself.
It’s probably a problem with the Cheta program; the original poster can compare the timing diagram with the program steps. Observe whether the program acts in accordance with the timing requirements; if not, it is definitely a fault in the control program (this situation is quite dangerous, so the machine should be stopped immediately and relevant technical personnel from Tianyi Pai should be called to resolve the issue). If the program and timing are consistent, it is possible that the operator failed to adjust the time parameters before switching the tower; as a result, the system’s cycle time is too short and the alternating frequency of the adsorption tower is too high, so the time parameters need to be adjusted immediately. The original poster should judge and handle it based on the actual situation.
Original poster, if your factory manages to solve this problem, please share the entire process of solving it and the analysis involved. It can be used as a reference for everyone in the future.
This suggestion is appropriate; I support it. Here is another suggestion: be aware that sometimes, incorrect adjustments to the internal time setting (either too high or too low), followed by attempts to correct those adjustments, can lead to errors in the program. I’ve encountered it. The solution is to run the entire loop once (instead of stepping through it one cycle at a time)
In addition to problems with the Chetta program, there are two other possible reasons for this situation: (1) The time parameters set during the Chetta operation are incorrect, leading to chaotic program execution and thus a shutdown of the system. (2) During the Chetta operation, no one went to the site to forcefully reset the faulty solenoid valves, which caused confusion in the system pressure; coupled with the program’s built-in optimization and diagnostic functions, this led to a shutdown of the system. The above information is for reference only!
It’s a problem with the program; ask the manufacturer’s staff to fix it
It’s possible that the Dicheta program is not yet fully functional; if the cause cannot be identified and resolved in a timely manner, it is recommended to stop the system immediately and address the issue thoroughly.
You have 8 towers, so there should be 2 inlets per tower. Then, when switching towers, should it be switched to operate with 6 towers?
It seems to be a programming issue; if that’s the case, the only option is to stop the system.
It must be a programming issue; contact the manufacturer for a solution. I agree with what was said on floor 8 – let’s share this information so that other manufacturers can learn from it and avoid unnecessary detours.
I think Kizou’s view is incorrect. When I was modifying an 8-tower HX unit, I used a system program that allowed me to stop any one of the adsorption towers at any time. As a result, the gas processing capacity was reduced by 1/8; operation remained stable, and there were no issues with resetting the system. If you are interested, feel free to call me to discuss this further. My phone number is 13350891007
It should be a programming issue; chaos like this shouldn’t occur under normal circumstances
It should be a programming issue; chaos like this shouldn’t occur under normal circumstances :)
The most likely reason is that the Cheta program wasn’t done properly. It’s also a matter of the devices used for cutting the timing; some irresponsible testers usually only check the main timing and are unwilling to spend time verifying the timing related to cutting, which is why problems like the one you mentioned occur. Even some programmers have problems with their way of coding. I encountered this problem in a project before; it turned out that the programmer had used a timing table from another project. Although that project followed the same process as ours, the numbering system for the control valve positions was different. As a result, valve movements became erratic during program testing. Therefore, one must be cautious during debugging. Otherwise, it will lead to serious consequences; especially, the reverse release valve may open accidentally while in the adsorption state, which is extremely dangerous.