System Selection

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. The accuracy, reliability, and cost differences must be considered in the selection of a system for a specific application. The CEM system selection process can also be limited by local regulatory agencies. These restrictions can include preap-proval procedures that limit the type of system an agency accepts. For example, with some types of emission monitors, some states require that only dedicated, continuous measurement are used; that is no time-sharing. They can also define such terms as "continuous." This factor directly defines the requirements for a data acquisition system.

Regulator

FIG. 5.12.4 Dilution-extractive system schematic. (Reprinted, with permission, from Lear Siegler.) ©1999 CRC Press LLC

Regulator

FIG. 5.12.4 Dilution-extractive system schematic. (Reprinted, with permission, from Lear Siegler.) ©1999 CRC Press LLC

FIG. 5.12.5 Dilution probe.
FIG. 5.12.6 Decision chain. (Reprinted, with permission, from J. Schwartz, S. Sample, and R. Mcllvaine, 1994, Continuous emission monitors—Issues and predictions, Air & Waste, Vol. 44 [January].)
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