Regarding the issue of fluctuations in oxygen purity
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Recently, the oxygen purity of the air separation unit in our plant has shown significant fluctuations between day and night. Everything is normal during the day, but at night the oxygen purity starts to drop, reaching as low as 99.2%. The oxygen content in the nitrogen coming out of the tower also increases, while all other parameters remain unchanged. I’m asking the experts here: what is the reason?
Where are you guys from? It seems like the environment is great!
It seems the liquid level is too high; try reducing the expansion amount at night. For reference only
I think it’s also due to the high liquid level; the consequence of this is an increase in the nitrogen content in liquid oxygen. In fact, the increase in oxygen content in the nitrogen gas coming out of the tower is also one of the factors that contribute to the rise in liquid level. The reason might be that there is too much liquid in the gas-liquid ratio entering the tower; low temperatures at night could also be a factor. You can try reducing the degree of expansion and see what happens
Compare the expansion amount and air volume at night and during the day