Nitrous oxide content in liquid oxygen of air separation units
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Dear teachers: Are there any specifications regarding the nitrous oxide content in liquid oxygen from air separation units? What is the indicator? Thank you.
Hehe, here we are with this phrase again :) I wonder who has seen this thing; aside from some articles that argue that it causes production shutdowns, those are just individual opinions. I have been interested in this for a long time, but I have never seen any cases of accidents related to it. As for data such as specification indicators, the instructions provided by the equipment manufacturer should be taken as the standard. Even if there isn’t any, the manufacturer should still provide an explanation. Out of curiosity, if there’s something new, feel free to share it. Thanks!
I also saw online information about the impact of nitrous oxide on air separation units, but I didn’t find any regulations that address this issue, so I’m a bit confused as well.
Just pay attention to it; it’s experts from various equipment manufacturers using such statements to cover up explanations for certain production accidents. There’s no need to invest too much effort in this. What’s available online is just one person’s opinion; there’s no consensus. For reference.
After treatment with a molecular sieve adsorber, the carbon dioxide content in the air (by volume) should be less than 1 PPm, the moisture content should be less than 2.6 PPm, and nitrous oxide levels should not exceed 0.07 PPm. The nitrous oxide content in the inlet air shall not exceed 0.35 PPm.
The limit of nitrous oxide in the inlet air at 0.35 PPm and the acetylene content in the liquid oxygen storage tanks at 0.1 PPm are specified in 16912. The impurity content in liquid oxygen at the molecular sieve outlet and in the main cooling evaporator of the cryogenic tank is not specified in 16912; is it mentioned in other standards? Or, it’s based on the manufacturer’s technical documentation.
Requirement in 16912: nitrous oxide content in the air at the intake opening to be 0.35 ppm
\"Safety Technical Specifications for Cryogenic Air Separation Units\"