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Plant personnel decided to increase the reflux flow substantially (approximately 33%) and repeat the scans to accomplish two things¨Cone, to see if the increased liquid flow would seal the centre downcomers, and two, to simulate the Debutaniser operations at the anticipated higher operating rates. First there was no observable change in the operation of the tray active areas. Next, a layer of denser, non-aerated liquid was located at the bottom of the downcomer providing a liquid seal as should be. Also, the froth material above the centre downcomers was gone without the vapour bypassing through the centre downcomers. |
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