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                    290                                                    Lawrence K. Wang et al.
































































                                   Fig. 21. Packed tower and packing types. (From US EPA.)


                          a larger tower fabricated will result in increased capital expense for a cross-flow tower
                          versus a countercurrent flow spray tower.

                       4.  A tray tower will always utilize the classic countercurrent flow scheme. As the name
                          implies, the tray tower has one or more internal trays. These trays have openings to
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