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Decline in heat transfer performance of heat exchangers for liquid air separation units

Decline in heat transfer performance of heat exchangers for liquid air separation units
In addition, the heat transfer temperature difference between the hot and cold fluid also has an impact on the temperature distribution of the heat exchanger, the greater the temperature difference, intensifying the difference in heat transfer between the different flow channels of fluid, is the heat exchanger channel between the axial and circumferential guide heat increases, resulting in an increase in the temperature distribution parameters of each section.
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When the amount of processing air is reduced, the rising steam and reflux liquid in the upper column will be reduced, but the reflux ratio will not change. Therefore, the reduction of processing air in a small range will not affect the purity of oxygen and nitrogen, and the reduction of processing air volume will help to reduce the pressure of the upper and lower columns. However, according to the material balance, the production of oxygen and nitrogen will naturally decrease when the amount of processing air is reduced. If the amount of processing air is too small, there will be leakage on the tray. If the heat and mass exchange of the leaked liquid is not sufficient, the purity of oxygen and nitrogen will be greatly affected, and even the normal production can not be realized. Therefore, the minimum allowable load of distillation column is generally specified.
May 12, 2026
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