Fabric filters (also called baghouses) are a state-of-the-art particulate control technology with a consistent 99% removal efficiency over the range of particulate sizes. Figure 10.9.15 shows a schematic diagram of a scrubber followed by a baghouse for particulate control. Particulates as small as 0.1 microns can be captured. The accumulated partic-ulates or fly ash fall into a hopper when the fabric filters are cleaned, and this ash must be disposed of appropriately. Table 10.9.5 lists the advantages and disadvantages of fabric filter systems.
ESPs consist of one or more pairs of electric charge plates or fields. The particulates in flue gases are given an electric charge, forcing them to stick to the oppositely charged plate. ESPs with four or more fields are state-of-the-art. Table 10.9.6 lists the advantages and disadvantages of ESPs.
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