How can one determine that the adsorption capacity of a molecular sieve has decreased?
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This post was last edited by you*n*nyou on 2011-5-23 18:47. How to determine a decline in the adsorption performance of molecular sieves? How is it best to adjust and process it?
Once saturation is reached, the outlet concentration generally changes; regeneration usually occurs after a certain period of time； For some molecular sieves, their color can indicate their properties; regeneration is usually carried out at high temperatures and low pressures
Under the same conditions, take a look at past trends for comparison
Incomplete regeneration, as well as too high air temperature entering the molecular sieve, affects the adsorption capacity. Solution: Reduce the temperature of the air entering the molecular sieve and properly control the temperature of the heater
During regeneration, the outlet temperature of the molecular sieve does not reach its peak value; during adsorption, the CO2 concentration at the outlet of the process gas exceeds the specified limit. This indicates that the adsorption capacity of the molecular sieve has declined
1. Excessive CO2 levels 2. High dew point
It can be proven by the fact that the online CO2 emission analysis readings often exceed the limits. (The analyzer is working normally.)
Several key points can be used to make a judgment: 1. The carbon dioxide content in the air at the molecular sieve outlet； 2. Comparison of the regeneration curve with previous trends: the cold blow peak is not reached ； 3. The most straightforward way is to check the color of the molecular sieve; its normal color should be white.
Reply to 8# Flying Fish 007: Hello, I have a question – what is the temperature at that peak of cold air flow?
The peak value during cold blowing is around 110 degrees; I’m not sure if it’s the same for you guys.
During regeneration, it is necessary to control the amount and temperature of the regeneration gas; the peak temperature should be monitored to ensure proper operation in the next cycle