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Why is there only one ar enrichment zone in the new single tower process

Why is there only one ar enrichment zone in the new single tower process
The reason why there are two argon enrichment zones in the twin-tower process is not only due to dilution of air, but also because the upper tower of the twin-tower process is the nitrogen-argon-oxygen air separation tower. In addition, the effect of oxygen-rich liquid air is also a major factor. Argon content in the oxygen-rich liquid air is about 2% and its quantity is very large, which has a great influence on the distribution of argon in the upper tower.It is the key factor for the formation of two argon enrichment zones in the upper column of the two-column process. The air in the new single column process enters from the middle of the distillation column with argon content of 1. At the same time, the air separation column in the new single column process is a nitrogen-oxygen-argon distillation column. Even if the argon content of the rising gas is high, the argon content of the mixed gas can not reach 2%, while the air inlet is above the distillation section. Under the condition of argon extraction, the argon content in the distillation section can only decrease continuously.Of course, it is impossible to form another argon enrichment zone.
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The air contains 0.932% argon. When 99.6% oxygen is to be produced from the upper tower, 1.05% argon must be contained in the nitrogen discharge. From the perspective of separation process, the distillation section of the upper tower (below the liquid inlet) is basically oxygen-argon separation, while in the distillation section (above the liquid inlet) then it is basically nitrogen-oxygen (argon) separation. The boiling point of argon and oxygen is relatively close (the boiling point of oxygen is-182.97 ℃ at 0.1013MPa, and the boiling point of argon is-185.7 ℃), so it is relatively difficult to separate. In the distillation section, such a situation often occurs. In the process of nitrogen-oxygen separation, the oxygen component is not separated clean, and the argon component basically escapes together with the oxygen component in the nitrogen discharge, reduce the purity of nitrogen. If it is required to produce high purity nitrogen, the oxygen component should be completely separ...
Mar 06, 2024
The newly installed distillation column must be thoroughly heated and blown off before starting and returning to work after long-term parking. After being put into operation, when the liquid suspension failure of the distillation column can not be eliminated, or the pressure difference before and after the heat exchanger pressure at the end of the operation period is more than 0.5MPa, or the purity of oxygen and nitrogen and the output decrease, it should be heated and blown off. First of all, make preparations before heating: 1) discharge the liquid in the tower; 2) dismantle the flow meter and thermometer at the outlet of oxygen, nitrogen and distillation, dismantle the upper and lower joints of the liquid air and liquid oxygen level gauge, and dismantle all the pressure gauges except the low pressure gauge; 3) close the high pressure air General inlet valve, joint-1 valve, oxygen and nitrogen products outlet valve, and the heating inlet main valve; 4) open the top rod of the inle...
Jan 17, 2024
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