【Daily Question】Chemical Engineering Principles 126: Tower Leaks (July 31)
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In the gas-liquid contact process in the Tarim Basin, when the gas velocity is low, some of the liquid drops directly through the sieve pores. 1 Try to increase the cross-sectional area of the downcomer, but this will reduce the opening area of the tray. 2) Improve the tray structure to reduce the tray pressure drop. 3) The flow rate of the returning liquid should not be too high.
1. The high liquid-phase flow rate (compared to the gas phase) causes the liquid phase to flow down through the openings in the trays without passing over them, which significantly reduces the efficiency of the trays. 2. To replace the trays, it is necessary to calculate the liquid and gas phases at the design stage in order to assess their opening ratio; however, it is difficult to prevent this issue effectively in practice
The phenomenon of liquid on the tray leaking directly off the tray. Increase the amount of rising steam.
What is the phenomenon of liquid leakage in a tower? Is it flooding?
When the processing volume is too small and the gas velocity on the tray is very low, a large amount of liquid flows down through the valve openings or on the tray due to gravity; this phenomenon is known as liquid leakage. The solution is to increase the processing capacity and raise the gas velocity.
Leakage, as the name implies, refers to the phenomenon where some liquid falls directly through the sieve pores; this occurs because the gas velocity during the gas-liquid contact process in a sieve tray tower is lower than the designed value. Severe leakage prevents liquid from accumulating on the sieve, thereby preventing normal operation. To avoid leakage, it is necessary to ensure even gas distribution so that gas can pass through each sieve pore. To ensure uniform gas distribution, the sieve plate structure should be designed properly, and an excessively low gas velocity should be avoided.
What is the phenomenon of liquid leakage in a tower? How to prevent it? The phenomenon of liquid on the tray leaking directly off the tray increases the amount of rising steam.
The phenomenon of liquid on the tray leaking directly off the tray. Increase the amount of rising steam.
Leakage phenomenon: The phenomenon in which the liquid on the tray leaks directly off the tray. Prevention: Increase the amount of rising steam.
The phenomenon of liquid dripping directly off the tray is known as leakage; increasing the amount of rising steam can prevent such leakage in the tower