The air separation equipment adjusts the purity of liquid air and liquid nitrogen, and the distillation in the lower tower is the foundation of the upper tower. The change in the extraction amount of liquid air and liquid nitrogen will affect the purity of liquid air and liquid nitrogen, and also affect the reflux ratio of the upper tower distillation section.
If the amount of liquid nitrogen extracted is too small, although the nitrogen purity is high, providing too little reflux liquid to the distillation section will reduce the nitrogen purity. At this point, due to the low oxygen concentration in the liquid, it will cause a decrease in oxygen purity and a decrease in oxygen production. Therefore, the optimal distillation condition for the lower tower should be to increase the extraction amount as much as possible while ensuring that the liquid nitrogen purity meets the requirements. On the one hand, it provides more reflux liquid for the upper tower distillation section; On the other hand, it can increase the oxygen concentration in the liquid air, reduce the distillation burden on the upper tower, and thus potentially increase oxygen production. It should be noted that the regulation of liquid nitrogen purity requires the use of a liquid nitrogen regulating valve, and the lower tower liquid nitrogen reflux valve cannot be used. The reflux valve should be fully open under normal circumstances.
DEAR Air Separation is a professional manufacturer of research and development, manufacturing, and installation of various complete sets of air separation equipment, providing customers with high-quality air separation projects and complete and efficient engineering and technical solutions to meet their needs.
