May I ask: is the nitrogen that condenses and liquefies as it rises to the main cooler from the air coming out of the lower column, all of the nitrogen contained in the total amount of material in that air from the lower column?

There is a portion at the top of the lower tower from which pressurized nitrogen is drawn off~~

Another unreliable answer: D. Actually, for those who work in design, this isn’t a problem; but if it’s easy to operate, then such calculations have no practical significance. Just as there’s no need to convert the \"calories\" we consume daily; it’s sufficient to know that eating enough will allow us to carry on working for 5 hours. In other words, this 78% doesn’t have much practical significance for operations. Because the nitrogen component extracted from the lower tower cannot be determined. This is related to the consumption of liquid air and argon systems in the lower tower, as well as the extraction of pressurized nitrogen. These conditions must all be met in order to carry out the calculation; without professional design, it really has little meaning. It might be done to provide some energy-saving data required by the company. What I mean is, things within the scope need to be done well, while for those outside the scope, it’s necessary to consider whether they can be done well. :)To be honest, sir.

You’re right, but what’s required in terms of operation isn’t just qualitative assessment; one must also be able to do quantitative analysis, to know how to calculate things and understand them. Even if one can’t do precise calculations, at least basic ones should be possible. As for me, I have only a basic understanding of instruments, electrical equipment, and machinery; I can analyze problems once time constraints allow, but I don’t know what’s going on inside them after they’ve been operating for some time – I’m very embarrassed about that