Predictive Emission Monitoring System


Predictive Emission Monitoring Systems (PEMS) are an innovative and cost-effective approach to continuously monitor source emissions as alternative to Continuous Emissions Monitoring Systems (CEMS).

PEMS are software-based systems utilizing process inputs to offer a continuous and real-time monitoring of
pollutants such as NOX, SO2, CO, HC or diluents like O2.

In general, PEMS are suitable for all gas and oil-fired emission sources providing equal accuracy and data
quality as traditional CEMS at much lower CAPEX and OPEX costs.

A Predictive Emission Monitoring System cannot measure emissions directly but uses an empirical model to predict emissions based on historical and real-time process data.

PEMS exist as stand-alone versions but are widely used as part of an integrated environmental monitoring Approach capable to address multiple sources in one plant. When combined with Data Acquisition and Handling Systems (DAHS) and integrated in plant-wide IT and communication networks, PEMS is a viable diagnostic tool to lower emissions and to improve combustion efficiency by surveillance of both, emission variations and associated changes in plant process conditions.

PEMS is used at multiple plant sites particularly in the U.S. but also in the Middle East and partly in Asia. In Europe, PEMS so far is common in selected countries.


PEMS solutions are industry independent and are able to deal with emissions from many different applications. However, fuels should not vary in their calorific values and composition. Typically they are used for gas and oil-fired plants in the utility, petrochemical, chemical and steel sector or other industrial plants or municipal sites.

In particular they are tailored for:

  • Gas- or liquid-fired emission sources
  • Boilers
  • Turbines
  • Reciprocal Internal Combustion Engines (RICE)
  • Biogas plants
  • Duct Burner
  • Dryers
  • Chemical Oxidizers
  • Regenerative Thermal Oxidizers
  • Process Heaters
  • Olefin Furnaces
  • Crude Heaters
  • Kilns
  • Ships
  • Offshore

Suitable Fuel Types include:

  • Fuel Oils
  • Natural Gas
  • Refinery Gas
  • Process Gas
  • Combined Fuels
  • And others