At what purity level of crude argon does nitrogen plugging tend to occur?
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From the first crude argon tower to the second crude argon tower, at what purity level of argon does nitrogen plugging tend to occur?
Purity is not an important metric; volume is what matters.
There are not many influencing factors, and it is necessary to explore them gradually through actual operation
There is no inherent relationship between the nitrogen plug and the purity of argon after one column~~ Preventing the formation of a nitrogen plug mainly involves controlling the nitrogen content in the argon fraction, as well as maintaining the nitrogen balance on the argon side of the crude argon condenser~~
Controlling the N2 content in the argon fraction is crucial, which is mainly reflected in the temperature in the middle section of the column as well as the oxygen content at the point where the argon fraction is extracted. If the temperature is low and the oxygen content is high, nitrogen plugging is likely to occur; a low temperature with low oxygen content is safer compared to the previous scenario. While a high temperature with high oxygen content is safe, it results in a lower argon extraction rate. A high temperature with low oxygen content represents the safest option, as it also ensures a decent argon extraction rate. Of course, there is a certain range for this – it cannot be extended indefinitely.
The higher the purity of argon, the higher the nitrogen content in it, which can lead to nitrogen plugging
The issue here is that the ratio between the amount of argon from the distillation process and the amount of crude argon at the outlet of the second tower isn’t properly controlled, which results in nitrogen accumulation on the argon side of the crude argon condenser~~