How can pure liquid nitrogen control valves and contaminated liquid nitrogen control valves be used to adjust the purity of pure liquid nitrogen, contaminated liquid nitrogen, and the night sky? I appreciate your advice!
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The book states that a pure liquid nitrogen control valve is used to adjust the purity of pure liquid nitrogen, while a contaminated liquid nitrogen control valve is used to adjust the purity of liquid oxygen. However, both of these valves can change the backflow ratio, which in turn affects the purity of liquid oxygen. So when you use the pure liquid nitrogen control valve to adjust the purity of liquid nitrogen and then use the contaminated liquid nitrogen control valve to adjust the purity of liquid oxygen, doesn’t that affect the purity of liquid nitrogen as well? How exactly should pure liquid nitrogen control valves and contaminated liquid nitrogen control valves be used to adjust the purity of liquid air and liquid nitrogen? And what level of purity should the liquid nitrogen have?
All valve operations are interrelated: first, operate the liquid nitrogen valve to determine its purity, and then gradually adjust the purity of liquid air. While adjusting the purity of liquid air, pay close attention to the purity of liquid nitrogen. This approach helps to reduce the pressure in the upper tower as well as its height
Analyze the lower tower in two sections: divide it into an upper and a lower part starting from the liquid nitrogen outlet. The upper part is for liquid nitrogen reflux, which can be considered the total reflux! Ensure the purity of liquid nitrogen; contaminated liquid nitrogen is used to regulate the reflux at the lower stage, as the total reflux amount is too high! If everything flows back, the purity of the night sky becomes too low; therefore, contaminated nitrogen is used as the reflux liquid in the upper tower. In this way, both liquid nitrogen and the night sky can be ensured.
Reply to 2# yanjie618901: I understand a bit more now, thank you
Reply to 2# yanjie618901: Thank you!
Reply to 3# 525h Air separation engineering*: Hello, I work in the field of air separation as well. I have no experience with steam turbines or 1-to-2 unit systems, and I would like to learn from you*. Could you please send me some educational materials on the principles of steam turbines, along with diagrams and information on specific operations? I am extremely grateful.
Reply to 3# 525h moderator: I’d like to learn some knowledge about steam turbines from you. Is that possible? Processes, principles, operations, and the like
First, use the liquid nitrogen control valve to adjust the resistance of the lower column; if there is a preset opening of 60% for the liquid nitrogen flow, the liquid temperature control is used to maintain the liquid level in the lower column. The most critical aspect of liquid nitrogen regulation is controlling the amount of reflux liquid returning to the lower column, that is, the valve for returning fluid to the lower column. Most of the valves for returning to the tower these days use a U-shaped liquid seal mechanism; they open gradually, and only the liquid nitrogen control valve is needed for regulation. As long as the purity of pure liquid nitrogen meets the requirements, the rest is just a matter of adjusting the load. When understanding this principle, don’t forget the pressure difference between the upper and lower towers. Books are meant to be read; they usually cover the principles and are applicable to the device architectures of their time. There have been many changes in modern processes, and the easiest way is to consult the technical personnel around you. There is a general outline for discussions on the forum, to facilitate targeted conversations. For reference. For reference.