Problems during PSA chetation process
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This post was last edited by chenlin_g on 2012-3-29 at 18:51. I work with hydrogen production equipment that uses the PSA process developed by West China Institute in Chengdu. The process involves 10 steps in total: 2 steps of adsorption, 4 steps of pressure reduction, 1 step of pressure release in the forward direction, 2 steps of pressure release in the reverse direction, 4 steps of flushing, 4 steps of pressure increase, and 1 final step of pressure increase. At 9 towers, it is 9-2-3; cutting off 4 average levels is possible. However, during the process of reducing the number of towers at low pressure, there is a problem: between the rise of 3 average levels (not including that point), the rise of 2 average levels, and up to the drop of 4 average levels (not including that point), 5-6 towers will remain in the same state for one step, resulting in 5 steps of adsorption. . . I’m not sure if everyone’s PSA units have this issue; also, what impact does an additional adsorption step have on the purity of hydrogen?
This is probably due to an incorrect timing sequence or a problem with the program. Under normal circumstances, this process should allow for a seamless switch between towers without any disruptions; the only impact is that the yield after the tower switch will be lower, but nothing else is affected!
There were no obvious issues when restoring the tower; it was only during tower switching that the number of absorption steps increased from 4 to 5. This seems to be a programming flaw. I’m not sure if this has been fixed now or by other manufacturers.
It’s probably a timing issue or a problem with the programming; the timing problem can be identified right away. As for the program, it depends on whether you know how to check it
You should read the PSA operation manual more carefully; each tower has an isolation period during one cycle. This is normal.
If there is a program for this, you can send it over so that everyone can take a look and see if it’s a problem with the program.
You just need to control the pressure in each tower; the impact on the product is minimal, only the processing volume changes