The Engineered Mist Eliminator - AMACS Process Tower Internals

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FIGURE 15SIMPLIFIED VIEWS OF TYPICAL MIST ELIMINATOR CONFIGURATIONS IN SEPARATORVESSELSSmall velocity differences are acceptable, but should beminimized at the design stage. Otherwise, some regionsof the mist eliminator may be subjected to heavy loadingleading to re-entrainment while other regions are unused.Most often, the mist eliminator is located just upstreamof the outlet nozzle with insufficient disengagementspace. Vapor tends to channel through the pad in theregion closest to the outlet nozzle and peripheral regionsof the pad remain unused. To rectify this, AMACS engi -neers apply an Integral Flow Distributor which is weldedto region(s) of the downstream face of the pad. Thistechnique allows the engineer to selectively increase thepressure drop through regions of the pad likely to sufferfrom channeling, and is cost effective.THE ENGINEERED MIST ELIMINATOR 9TEL: 800-231-0077 FAX: 713-433-6201 WEB: www.amacs.com EMAIL: amacs@amacs.com
Advanced Mist Eliminator DesignsThere are several modifications to mesh pads andvanes to dramatically enhance performance.FIGURE 16Guidelines for maintaining even flow distribution acrossmesh pads or vane units with axial flow in cylindrical vessels.Height of vessel head is assumed to be 1/4 of vesseldiameter. Flow distribution devices can minimize requireddisengagement space above mesh pads.Contact AMACS for assistance.Drainage & Collection LayeringRecall the discussion on pressure drop through a misteliminator in which liquid tends to pool in the lower layersof mesh. The simplest technique to promote drainage isto use a few inches of open, porous mesh such asAMACS style 7CA (5-lb density with specific surface areaas low as 45 sq-ft/cu-ft) in the upstream position. Asdrainage occurs through the interstitial regions of theFIGURE 17mesh, opening theknit enhances liquiddrainage.An extension of thisapproach is to usehigher specific surfacearea mesh in down -stream positions toenhance separationefficiency, with inter -mediate mesh between the collection and drainagezones. Figure 17 illustrates a Multilayer mist eliminator.MisterMesh ® Drainage RollsA second technique used by AMACS to enhance liquiddrainage, and often in conjunction with multi-layering,is to append drainage coils to the upstream face of ahorizontal mist eliminator as shown in Figure 18.The rolls are also made of mesh and "fill" with liquid.FIGURE 18High removalEf ficiency LayerIntermediateLayerDrainage Layer ,Open PorousMeshMISTER MESH PAD WITH DRAINAG E ROLLSOnce filled, liquid from the pad above is drawn through,surface tension affects to the coils, thereby establishingdistinct regions for liquid drainage and liquid collection inthe upstream layers. Figure 18 compares the pressuredrop and flooding point of both conventional andMisterMesh ®Mist Eliminators.THE ENGINEERED MIST ELIMINATOR 10TEL: 800-231-0077 FAX: 713-433-6201 WEB: www.amacs.com EMAIL: amacs@amacs.com
Page 2: Table of ContentsIntroduction......
Page 8 and 9: K = K = [( ρL- ρG )Vd 2 ] / 9 µD
Page 12 and 13: Mesh-Vane AssembliesIn grass root d
Page 14: K = [( ρL- ρG )Vd 2 ]/9µDK = 0.5

The Engineered Mist Eliminator - AMACS Process Tower Internals

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