The operating pressure of air separation units equipped with boosters can reach 5 MPa or even higher – why is it still called a low-pressure process?
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———————————————————————————————————————————————————————————— This is the definition given in a certain textbook: \"Based on the working pressure, they can be classified as high-pressure devices with a pressure range of 10.0 – 20.0 MPa.\"； Medium-pressure devices with a working pressure of 1.0 – 5.0 MPa ； A fully low-pressure device with a pressure of 0.5–0.6 MPa. ” So now, the operating pressure of air separation units equipped with compressors is as high as 5 MPa or even higher; why are they still referred to as low-pressure processes, and why are they all named after the KDON model (as we all know, D stands for low pressure)? How do everyone understand it? —————————————————————————————————————————————————————————————
I’m not quite sure what you mean; have you not understood the work pressure?
In my understanding, the low-pressure process refers to the pressure within the distillation tower, rather than the highest pressure in the process
The pressure you mentioned refers only to the pressure before entering the tower; as for what type of process is used in air separation, it depends mainly on the pressure in the distillation tower, rather than the pressure of the air compressor or booster
D stands for low pressure, KD refers to the low pressure in air separation. The same Chuan Kong equipment is sometimes denoted by KZ: medium-pressure air separation. D mainly refers to a raw material export pressure of around 5 kilograms, which is why it is called low-pressure air separation. Z mainly refers to the pressure at the booster end of the expander reaching around 50 kilograms, which is why it is called medium pressure. Actually, it’s all the same; it’s just that the reference points are different.
I agree with what the guy on the fifth floor said; I’ll learn * it too
Check the operating pressure of the tower to see if it is low pressure or high pressure.
In my opinion, the main consideration is that the distillation section should follow a fully low-pressure process. Additionally, it is named based on previous devices as a reference point; of course, further improvement is still needed.
This post was last edited by you*n*nyou on 2011-5-6 22:32. Thank you all for your participation! That’s how I’ve always understood it too! Unfortunately, the books \"New Questions and Answers on Oxygen Workers\" and \"Oxygen Production Technology\" are not clear in their descriptions; they only use terms like \"operating pressure\" or \"service pressure\" (you can go and check these two books). I was unable to explain it clearly to the people I was working with, and they even suspected that I was the one who made a mistake!
This post was last edited by home1984 on 2011-4-29 at 18:16. The definition provided by the original poster applies to previous air separation units, mainly those used in small-scale applications. The air separation technology is developing at a rapid pace these days, yet some books and publications still use outdated information to mislead people in the industry, leading them astray. In current air separation processes, high, medium, and low-pressure streams are still defined by the highest pressure encountered in the air separation process, eliminating the need to differentiate them based on the operating pressure of the distillation columns. The operating pressure of the distillation tower is becoming increasingly lower; there is no longer a distinction between high, medium, and low pressure.
Reply to 10# home1984: The outlet pressure of the booster in the air separation unit is currently 52 Kg/cm2, which should be the highest pressure in that unit. So is it considered a high-pressure process? Please advise; this is a very good question