Predictive Emission Monitoring System (PEMS)

DATACEMS - Predictive Emission Monitoring Systems (PEMS)

Predictive Emission Monitoring Systems (PEMS) are tools for the continuous monitoring of source emissions as an alternative to Continuous Emission Monitoring Systems (CEMS).

The software-based systems use process data to enable continuous and real-time monitoring of pollutants such as NOx, SO₂, CO, HC or reference values such as O₂.

• Software-based emission monitoring of primary pollutants (NO_X, SO_X, CO) and O₂, CO₂, VOC, HCl, NH₃, H₂S, etc.
• Alternative to CEMS (AMS) if there is a reliable correlation between the operating conditions of the plant and the emissions
• Lower capital expenditure compared to CEMS
• Lower operational, maintenance and repair costs compared to CEMS
• Less need for maintenance personnel
• Valid results for all operating conditions reflected in the model, including startup and shutdown
• Precision comparable to CEMS
• Resistant to missing inputs – no impact on data availability in the event of process sensor failure
• Creation of the models by employees on site or external consultants
• Possible use of the PEMS as a diagnostics tool to reduce emissions
  

PEMS can be used in a wide variety of plants around the world.

PEMS solutions are industry-independent and tailored to all types of gas and oil-fired emission sources. However, the fuels should not vary in their calorific value and composition.

Typically, PEMS are used for gas and oil-fired installations in the utility, petrochemical, chemical, and steel sectors, or other industrial plants.

Possible emission sources

• Boilers
• Turbines
• Combustion engines
• Biogas plants
• Channel burners
• Dryers
• Chemical oxidization plants
• Thermally regenerative exhaust air purification systems
• Olefin plants
• Crude oil heater
• Ships
• Offshore plants

Suitable fuel types

• Fuel oils
• Natural gas
• Refinery gas
• Process gas
• Combined fuels

Conformities

• CEN/TS 17198
• US EPA 40 CFR Part 60
• US EPA 40 CFR Part 75
• Performance Specification 16 (PS-16)

PEMS cannot measure emissions directly. Instead, they employ empirical models to determine emissions based on historical and real-time process data.

In doing so, they determine the relationship between characteristic process parameters of an emission source and the corresponding emission concentration.