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162 Wastewater Solids Incineration Systems
FIGURE 7.12 A dry electrostatic precipitator (courtesy of Environmental Elements Corp.).
Several factors influence the design and particulate removal efficiency of a dry
ESP, including particle size distribution, gas flow rate, uniformity of gas flow in the
ESP, resistivity of the fly ash, particle density, and temperature of the exhaust gas.
2.6.1 Performance
Most dry ESP installations comprise three or more fields. This allows one of the
fields to be bypassed while the others remain in service. On recent installations at
power plants, as many as five fields are used with a minimum of four in operation
at all times. Each field removes a greater percentage of the total inlet particulate
loading. Depending on resistivity of the fly ash, particle size distribution, flue gas
