Norm. What does this mean? I have a distillation tower that I think is flooded. I raise the reflux, yet fractionation does not improve. Does this not indicate flood? But the overall delta P, which is constant and really low, does not increase as I increase the reflux flow.
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Neal – Flooding progresses up a tower, not down. If the top trays are fouled, then only they will flood. The reflux flow will just recirculate back to the reflux drum and not increase vapor flow at all. Fouling of the top trays is common due to corrosion of the overhead condensers and the sublimation of volatile salts (NH4CL or NH4(HS)2.
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