Requirements for nitrogen purge intake
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This post was last edited by sxtblo on 2011-6-27 23:13. Are there any requirements regarding the CO content in the process gas fed in through liquid nitrogen washing? If so, what is the minimum level allowed, and what is the maximum level?
It cannot be too high; the specific criteria depend on those of the previous processing steps. If it is too high, the CO2 content increases as well. When physical adsorption occurs on the molecular sieve, a large amount of latent heat is released, causing the temperature to rise, and the insulation materials in the cold box will melt. We have encountered this situation before
This post was last edited by 654262293 on 2011-6-27 at 18:48; the requirement for the transformed export CO is below 1.5%.
Reply to 3# 654262293: Isn’t liquid nitrogen washing used for cleaning CO? What I want to know is its cleaning capacity – what is the concentration range of CO that it can clean?
Wash carbon monoxide? Isn’t it to enter a cold box to produce carbon monoxide?
In my opinion, there should be no limit on the amount of washing, as long as there is enough liquid nitrogen! I would appreciate some advice from those who are more experienced~!
There should be no requirements; it’s a purification device, not a gas-generation device. Some people think that a higher level of CO or methane means more cooling capacity, but this is a misconception; as long as the amount of nitrogen used for washing is sufficient, that’s enough.
Better read a book and check the operating procedures!
CO2 < 20 ppm, methanol < 40 ppm
During normal production, it’s around 3%; we require a level of 5% when the system is in operation. A too high level leads to excessive pressure of nitrogen in the nitrogen washing tower, which affects the cryogenic tank；