Carbon Molecular Sieve (CMS) & Inlet Air Temperature
Q1：Why does nitrogen generator performance decrease at high ambient temperature?
PSA nitrogen separation relies on the difference in diffusion rates between oxygen and nitrogen in CMS micropores. Higher temperature reduces this kinetic selectivity, resulting in lower nitrogen recovery and higher energy consumption.
This is an inherent characteristic of PSA technology, not a CMS quality issue.
Q2：Does high temperature damage the carbon molecular sieve?
No.
CMS material itself can withstand temperatures above 200 °C. High temperature affects separation efficiency, not the material integrity.
Q3：What are the specific effects of higher inlet air temperature?
Typical effects include:
Reduced oxygen adsorption capacity
Lower nitrogen recovery
Higher air-to-nitrogen ratio (A/N)
Increased energy consumption per Nm³ N₂
Q4：Can parameter adjustment compensate for high temperature operation?
Only partially.
PSA operating parameters are optimized for a design inlet temperature of around 25 °C. Sustained high temperature disrupts this balance.
Q5：What is the recommended inlet air temperature range?
For long-term operation, ≤30 °C is strongly recommended.
Q6：Why is the air temperature still high after an air dryer?
Refrigerated dryers are designed mainly for moisture removal, not deep cooling. Under high ambient temperature, outlet air may still reach 35–40 °C.
Q7：Does long-term high temperature operation shorten CMS service life?
It may accelerate performance degradation, but this is due to operating conditions, not product defects.
Q8：How to distinguish temperature issues from CMS quality issues?
Recommended checks:
1.Measure inlet air temperature
2.Check if it is continuously above 35–40 °C
3.Compare performance during cooler periods
4.Observe performance recovery after temperature reduction
Q9：Is performance reduction under high temperature covered by warranty?
If inlet air temperature exceeds the recommended range, performance reduction is generally considered an operating condition issue, not a material quality issue.
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