ABSTRACT
This chapter provides an overview of the continuous emission monitoring (CEM) technology, the components of a proper analysis system, and details in the reliable and accurate operation of CEM. More stringent clean air standards require more stringent monitoring of the release of pollutants into the atmosphere. The need is growing for reliable CEM capabilities and for documenting the release amount from process plants. Therefore, a CEM system is an integral part of utility and industrial operations. Extractive CEM systems can be configured for either dry-or wet-basis measurements. Both configurations can achieve the Clean Air Act Amendment-required 10% relative accuracy. The newest, accepted measurement system is dilution-extractive CEM. The dilution-extraction CEM system uses a stack dilution probe designed in Europe. The majority of the systems purchased for existing utility boilers are the dilution-extractive type. Beyond the utility industry, the dry-extractive, wet-extractive, and dilution-extractive systems are all viable choices.
