Influence of tray slope on hydrodynamics of bubbled layer for trays made up of S-channel elements
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For large-diameter trays, a negative slope (against the direction of flow) has an unfavorable effect on the hydrodynamics of the bubbling process and hence cannot be allowed.
A positive slope (in the direction of flow) from 0 to 18 mm/m gives a sharp decrease and then complete elimination of the liquid level gradient, thereby creating conditions for uniform gas saturation of the bubbled layer in the entire tray area and broadening the range of stable operation. A positive slope, for trays made up of S-channel elements, is not only allowable, but within certain limits (up to 10 mm/m) is desirable.
For S-channel trays operating with submerged caps, the height of the bubbled layer with large liquid loads will be decreased slightly by a positive tray slope; apparently this does not have any significant influence on tray efficiency. In large-diameter towers, in sections with high liquid loads, it is recommended that S-channel trays should be installed with a slope down toward the overflow, amounting to 5–10 mm/m.
KeywordsSignificant Influence Tray Sharp Decrease Negative Slope Positive Slope
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