DE-Lecture14-Solids-Removal

DE-Lecture14-Solids-Removal - Dredging Engineering Dredging...

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Unformatted text preview: Dredging Engineering Dredging Engineering Lecture 14 Lecture 14 Solids Removal Solids Removal- Hydro Hydro-cyclones cyclones- Linear motion shakers Linear motion shakers- Centrifuges Centrifuges- Weir tanks Weir tanks Luis Prieto-Portar 2010 In past lectures we have discussed the varying concentrations of solids in the dredged slurry. In capital dredging these solids are usually clean fills. However, in both maintenance and remedial dredging the solids are typically contaminated. This lecture studies some methods to handle these solids. Solids Separation Machines. One of the most effective methods of separation are hydraulic-cyclone flows. The high flow velocity in a hydro-cyclone separates the heavier particles from the lighter ones (left photo). The process then sends these heavy particles to a shaking sieve (right photo) for further segregation. - Hydro-cyclones , as shown at left, have cones made of high dura-meter cast polyurethane (also available with ceramic insert option for heavy duty abrasion resistance); these 10” and 12” cones can also be made from steel with silicon carbide. - De-sanding hydro-cyclones , as shown at left, remove abrasive coarse-sized particles down to about 60 microns (#230 sieve). Their 12” and 10” models range from 500 gpm to 1,500 gpm capacities.- Desilting hydro-cyclones remove fine sand and silts down to 32 microns (#460 sieve). The cones are made of high dura- meter polyurethane with optional ceramic inserts. A linear motion shaker may have its deck angle adjustable during operation from –2 ½ to +5 degrees; the pre-tensioned screens with wedge fastening (optional hook strap) are capable of high G-forces: from 2 to 8.5 G, to provides dry solids discharge. There are a number of varieties of screens: - Pre-tensioned (seen on photo at upper left), - Hook-strap, - Polyurethane (photo at lower left),- Wedge wire types. Screens for the KEM-TRON and DEL TANK machines range from #10 (2 mm) down to #460 (32 μ m). Triple layer screens are 28" x 48" and work with KTL-48 models. The KDDX single wire mesh are 30" x 72" and made for the top scalping deck of the KTL-48D shaker....
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This note was uploaded on 08/29/2011 for the course CGN 4930 taught by Professor Prieto-portar during the Summer '11 term at FIU.

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DE-Lecture14-Solids-Removal - Dredging Engineering Dredging...

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