Difference between inflowing expanded air into the upper tower and the lower tower
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What is the difference between feeding expanded air into the upper tower and into the lower tower? Could some expert give me some advice! ! ! !
This is classified according to the design situation, mainly based on the design. The difference is quite significant; it affects the extraction rate.
1. For expanded air to enter the lower tower, the pressure of the air leaving the air compressor must be much higher. The pressure at the outlet of the air compressor in the process of feeding into the tower can be 0.5 MPa(G); this is generally used in external compression processes ； In the process of entering the lower tower, the pressure at the air compressor is between 0.85 and 1.0 MPa (G); this approach is generally used in internal compression processes, which result in a higher volume of liquid output. 2. Although the process of feeding expanded air into the lower column does not make full use of the distillation potential of the upper column, most of the argon ends up in the liquid air stream, which is then sent to the upper column; as a result, the recovery rate of argon can be very high, reaching 90–92%. And the process of entering the tower only yields 83%.