Capital cost for Packed-bed Scrubbers

The costs for packed-bed scrubbers depend on the inlet gas velocity/column diameter, orientation of the column (vertical vs. horizontal), height of packing material, and the presence of any auxiliary equipment. Figures 1 and 2 present costs curves for two types of packed-bed scrubbers. Figure 1 presents a cost curve for a small vertical column packed-bed scrubber. The costs for this unit vary with the column diameter, which can range from 1 to 2.5 feet. Gas flowrates range from 200 to 1200 ACFM. 

For Figure 1, the scrubber is assumed to be constructed of FRP with 6 feet of polypropylene packing. Costs also include the costs for a spray nozzle, liquid distributor, and mist eliminator. Figure 2 provides a cost curve for a large packed-bed scrubber with horizontal gas flow from 800 to 80,000 ACFM. Costs for this unit are based on the use of PVC or FRP construction materials and a design that includes a spray section, a 1-foot packed bed, and a mist eliminator

Figure 1. Vertical Packed-bed Scrubber Capital Costs

Figure 2. Horizontal Packed-bed Scrubber Capital Costs