Are there standards for mist entrainment at the tower top?
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The standard for mist entrainment is that no more than 0.1 kilograms of liquid per kilogram of gas is entrained, but this applies only to the phenomenon where mist droplets generated on the lower tray levels are carried by the upward airflow to the upper tray levels. However, mist entrainment occurred at the top of the tower in my unit, and the design firm tried to shirk responsibility by claiming that it met the standards for mist entrainment. Actually, when this tower was first in operation, there was no entrainment issue; however, it has become more and more severe recently. This tower features packing in the lower section and bubble trays in the upper section – it is a gas purification tower! Gas enters from the bottom of the tower. Does anyone know whether the inclusion at the top of the tower complies with the standards? Are there any relevant specifications?
Can a demister be added at the tower outlet? For the entrained mist, a wire mesh demister can typically achieve a demisting efficiency of over 95%.