ABSTRACT
Air pollution control (APC) systems must perform to meet the needs of the process from which emissions are to be controlled and to satisfy the applicable emission regulations. Acquiring APC systems is much like buying and operating a vehicle. Ambient weather data are important. Such data can determine how non-adiabatic a component is and can affect condensation, dew points, and freezing of slurries. Bridging in hoppers, “mudding” of filter bags, and corrosion are other negative effects of cold weather. Electrostatic precipitators (ESPs) are big boxes which become more efficient as more stages are added in series. Each stage removes about 80% of the stage inlet dust on a well-designed unit. Therefore, the inlet sections require much more frequent cleaning than the outlet stages. This is good, because our major source of emissions from an ESP comes when the stage is cleaned.
