Low-temperature methanol wash downcomer
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During normal operation of the low-temperature methanol wash downcomer, does the upper layer of downcomers need to be below the liquid level in the receiving tray of the lower layer? If it is not below the liquid level, will gas pass through it, preventing gas-liquid contact?
During normal operation, it should be below the liquid level to reduce the impact of the liquid on the surface. Actually, there’s no need to be so strict – as long as everything is below the liquid surface and the fluctuations in the liquid level aren’t too great, that’s fine. Gas will not rise up through the downcomer; I think the downcomer should have the ability to collect liquid, with most of the liquid gathering here, so the pressure should be quite high.
Generally below the liquid surface! The function of the downcomer is to prevent inaccurate readings of the measuring instruments caused by fluctuations in liquid level! There is no way for gas to rise above the liquid surface; the pressure there is much higher than that on the trays, and liquid keeps flowing there. The only exception is when flow is interrupted, in which case it might rise through the downcomer
The downcomer is generally below the liquid level in the liquid receiving tray! ! In other words, it doesn’t matter if it’s below the liquid level anymore, because as liquid keeps flowing downward, gas won’t be able to rise up through the downcomer!