How to deal with a decrease in PSA purity?
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Shanghai Ruiqi products produce 100 cubic meters of gas per unit. Currently, their purity has decreased; it used to be 99.99%, but now it is only 98%. What is the reason for this? How to deal with it? Please help! ! ! Inlet pressure is 0.7 MPa, and the outlet flow rate is less than 100
I’m not sure what adsorbent is used in your products and the one you are using, but generally speaking, there are various reasons for a decrease in purity, such as the adsorbent becoming poisoned and losing its adsorption capacity； Changes in the composition of the feed gas ； Effects of pressure and temperature ； There are also issues such as improper setting of operational parameters ； The solution is to first check what the cause is; if it is due to the adsorbent, then the adsorbent needs to be replaced ； If there are any changes in the composition of the feed gas, they must be corrected promptly ； If it is temperature, the PSA needs to be adjusted accordingly; generally, a very high temperature is not required, but a higher pressure is needed to facilitate adsorption ； If it is impurity penetration, the parameter values need to be reset to increase the replacement intensity. Also, check the adsorption tower and programmable valves for any leaks; if any are found, stop the operation immediately and carry out thorough replacement.
Reply to 3# Broadband user: Haha, I don’t know either. My problem has been solved; thanks! There was a slight internal leakage in a pneumatic shuttle valve, and it took me several days to figure it out – wow.
Check the valve; it seems to be leaking
Which valve’s internal leakage could cause such an effect?
Low PSA nitrogen purity: The 1’ valves are not functioning properly. 2. Air flow decreases. 3. The filter is clogged. 4. Air leaking from the pipeline; 5. Faulty oxygen analyzer or incorrect zero point. 7. The performance of the adsorbent declines. Previously, our company also faced issues with reduced product quality due to low purity, and it was later found that this was caused by abnormal operation of a balance valve.
Internal leakage in the valve? Is a shuttle valve being used? What is the reliability of the shuttle valve?
The quality of pipeline pneumatic valves is very reliable; it’s not clear how long they have been in use, but spare parts for such valves should be available. You can call after-sales for assistance.