Crossflow scrubber

S. Y. Cabibbo and A. J. Teller, "The Crossflow Scrubber—A Digital Alodel for Absorption," Paper Mo. 69-186, APCA 62nd Annual Meeting Mew York, M.Y., (June 22—26, 1969). 

The gas flows horizontally, contacting by downflowing liquid. The effective driving force for mass transfer is between that for counter- and cocurrent contactors. Crossflow scrubbers have low pressure drop and usually require a lower liquid/gas ratio than either counter- or cocurrent scrubbers. The time of contact between gas and liquid is relatively low, and crossflow units are not reconunended for most chemical absorptions. Design procedures follow a finite-element approach the scrubber volume is divided into cubes, each of which is assumed to reach equilibrium. 

Crossflow scrubber Ap = 0.3 kPa/m of width 1 to 1.5 m width usual water flow rate 2.7 L/m s of horizontal cross-sectional packing size on actual inlet gas flow rate to the packing face of 1 mVm s. 

Cross-file patent searches, 18 243-244 CrossFire Beilstein, 6 19 Cross-flow filtration, 11 383 15 827, 829 in porous pipes, 11 387-388 with rotating elements, 11 383-387 Cross flow model, 21 706 Cross-flow packed scrubber, 26 687-688 Crossflow plates, 6 762-763 Cross-flow screens, 22 282 Cross-flow velocity, 15 725 Crosshead mandrel, in VDC film extrusion, 25 732-733 Cross-lapping, 17 501 Cross-linkable epoxy thermoplastic system (CET), 10 436... 

The heart of a scrubber column is the slurry-gas contact zone, where gases are intimately combined with the absorbent slurry so that the pollutants can be captured by the reactions given previously. There are a number of possible methods for designing the contacting zone, including sprays, crossflow plates, baffle plates, counterflow plates, and packed columns. These all have the purpose of maximizing the interfacial area between the gas phase and the liquid phase, to allow rapid transport of gases across the surface. ... 

Figure 8.1.5. Nine-plate (nine-stage) gas-liquid scrubber with the absorbent liquid in crossflow over each perforated plate, throu which the gas bubbles move up the overall pattern of flow of the gas and liquid phases is countercurrent.

The results of demonstration tests that ended in early 1980 were presented in a U.S. EX)E report (Pacific Gas and Electric Co., 1980). In the demonstration testing, a stream of approximately 100,000 Ib/hr of steam, enough to supply a 5 MW power generating plant, was treated in a crossflow sieve-tray scrubber. The column was 6 ft in diameter by 30 ft in height. 

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