For internal compression air separation, the nitrogen pressure at the lower column ranges from 21,000 to 42,000; how should the process be adjusted? . .
Thread Content
For internal compression air separation, how should the process be adjusted when the nitrogen pressure at the lower column changes from 21,000 to 42,000? . .
If you obtain more gaseous nitrogen, then you will need to use less liquid nitrogen. It should be noted that the operation is feasible only if there is an adequate amount of air available after passing through the molecular sieve.
First, ensure an adequate air supply, then increase the amount gradually to maintain stable operating conditions.
Assuming it was in a stable state initially and the pressure of nitrogen increases, the amount of air will automatically increase; therefore, the liquid nitrogen throttle valve V3 going to the upper tower should first be reduced in size before being restored to its normal setting. Due to the increased main cooling load and thus more rising gas, more liquid nitrogen must be supplied to the upper column; this means that the amount of liquid nitrogen taken out needs to be reduced, while the amount of liquid oxygen taken out increases (with the amount of gaseous oxygen remaining unchanged). The argon system is loaded. The results may vary depending on the process or technique used; this is just my personal opinion for reference. Personal opinion, for reference only.
Assuming it was in a stable state initially and the pressure of nitrogen increases, the amount of air will automatically increase; therefore, the liquid nitrogen throttle valve V3 going to the upper tower should first be reduced in size before being restored to its normal setting. Due to the increase in the main cooling load, why does the main heating and cooling load increase? ? ? ?
Reply to 5# Air separation engineering*: The amount of air processed has increased; as long as the operating conditions remain normal, the reflux ratio should stay the same, yet the amount of liquid returned also increases. Although more pressure nitrogen was used, more also condensed, so the main cooling capacity increased. It’s just my personal understanding; I’m not sure if it’s correct. . . .
If it’s an existing air separation unit, can it be handled? It seems like I can’t get past the issue with plate replacement.