Protection in Continuous Emissions Monitoring Systems (CEMS)

In various types of facilities, gases are emitted from stacks which prevent ground level air contamination in plant areas and aid in dissipation to the atmosphere. Governmental clean-air regulations require monitoring of stack gases. Continuous Emission Monitoring Systems (CEMS) provide the analysis required for this purpose.

  • The government mandates that CEMS analyzers maintain high accuracy and have minimal down time or heavy monetary fines are imposed. There are many obstacles in sampling stack gases, which can be challenging for many companies.
  • The sample gas is often reactive, difficult to maintain in its original state and very hot with high water dew point temperatures.
  • The sample gas may often contain sulfuric acid which slowly accumulates on the optical system of infrared analyzers which can cause analysis errors and require analyzer maintenance. Maintenance results in downtime and downtime results in profit loss.
  • The components to be analyzed are usually present in low parts per million (PPM) concentrations.
  • Sample point locations are difficult to access, generally high above ground level and so long heat traced sample lines are required.
  • The presence of particles and liquids in the sample gas often require special sample probes which may be heated or blown back with compressed gas to clear them.

Design and operation of a CEMS sample system can be a major challenge for even those skilled and experienced individuals. The Genie Model 133 can be used at the ground level portion of the sample conditioning system near the analyzers to protect the gas sample pump from liquid damage. It can also be placed prior to the analyzer to protect the analyzer’s optics from damage caused by liquid and sulfuric acid mist. To learn more about the use of the Genie Model 133 in a CEMS applications, refer to the Genie 133 Application Brief.