L10 - CHEE 3462 Lecture 10A Tuesday, February 19th 2002 3...

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CHEE 3462 Lecture 10A Tuesday, February 19 th 2002
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3 Kinds of Plates Sieve Lift Valve Bubble Cap
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Sieve Plate Diagram Underflow Weir Overflow Weir 2.5-5 cm n-1 Downcomer h ow n h w
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Sieve Plate Objective To bring gas and liquid into intimate contact to cause mass transfer. - Liquid from (n-1) St plate flows over the overflow weir, goes into the downcomer, flows across the n th plate. -Gas flows thru the holes of the sieve plate, n (say), rises thru the liquid above the n th plate, then flows up, then thru the holes of plate (n-1). -Gas contacts liquid in a cross-current manner over a plate. (Counter-current in the scale of the column.) -Downcomer is usually one (or many) pipe(s) stuck to the tray. •Typically 10-15% of cross-section covered by downcomer. •70-80% for the sieve.
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-Overflow Weir: •Pipe sticks out by 2.5-5 cm. •Stops bubbles from flowing down with the liquid. -Underflow Weir: Prevent downcomer bubbles from entering that plate -Holes: •5-12 mm in diameter. •No holes near weirs. •Holes too big liquid drips thru them •Holes too small P needed to push the vapor is large.
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L10 - CHEE 3462 Lecture 10A Tuesday, February 19th 2002 3...

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