Selection of the up-and-down tower configuration
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The difference lies in the fact that both the upper and lower towers are packed towers; the upper tower uses packing while the lower tower uses a sieve plate.
Sieve plate tower: 1. It is not sensitive to changes in the liquid load (liquid reflux rate). 2. The pressure drop of a sieve tray tower is greater than that of a packed tower. 3. Under high-pressure operation (above 0.3 Mpa), the separation efficiency of tray towers is slightly better than that of packed towers; under low-pressure operation (below 0.3 Mpa), the separation efficiency of packed towers is significantly better than that of tray towers. 4. The liquid holdup in a sieve tray tower is approximately 8% to 12% of the liquid flow rate, while that in a packed tower is generally less than 6%. 5. Strainer tray towers can have side draws, while packed tower columns cannot have side draws. When used in a lower tower: 1. It has high energy consumption; using a packed tower system can reduce energy consumption by 1%-2%. 2. The height of the tower below the sieve plate is significantly lower than that in a packed tower, reducing the overall cost. 3. It has a large liquid holding capacity and high stability, but weak regulation capability; the production rate of the packed tower can be reduced to very low levels.
With the improvement of packing technology and the reduction in manufacturing costs, it is becoming a trend to use packing instead of sieve plates in towers~~ primarily for energy savings and a wider range of operating loads~~