The oxygen recycle ratio is a bit high
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Every time the liquid level in the oxygen column’s condensation evaporator rises, the purity decreases. It is initially assumed that the reflux ratio is too high. How should the valves be adjusted? Should the liquid nitrogen throttle valve be closed? Every time liquid nitrogen is added, the purity increases; therefore, it is determined that the reflux ratio is too high. During the first attempt at operating it independently, I didn’t dare to touch the valves for fear of causing problems. With some guidance from an expert, there are three streams of reflux liquid in the oxygen tower – going from top to bottom they are liquid nitrogen, the liquid from the lower tower, and the liquid from the nitrogen tower. The gas flow rate into the tower is 15,000, and the purity of the oxygen at 2,500 is only around 94.6%
When liquid nitrogen is added again, the purity can reach 96
With an air volume of 15,000 and an oxygen content of 3,100, if 2,500 of that is oxygen, how much liquid oxygen is required? What is the purity of the contaminated nitrogen? Calculate the reflux ratio – what is the normal range? Above what value does the oxygen quality deteriorate? This can serve as a reference in the future. Do you think it’s common for the level of the main cooling liquid to rise each time? Is it caused by the molecule plug switching?