08-03-2013
Predictive Emission Monitoring System

A predictive emission monitoring system is a neural network or an empirical computer mode employing the link between the fuels supplied to the ignition, the air quality and the operating factors on the process from one end and the air emission on the other end. The usual operating factors include temperature, pressures, speeds and loads. Once we establish the model, we can easily predict continuously with correctness better or similar to physical CEMS (physical continuous Emission Measurement Systems).

The concurrent recording of functional data and exhaust gas scrutiny of certified quality determines the pre-condition for precise PEMS. We then utilize this data to establish a model.

To some extent, predictive emission monitoring system is tolerant of incorrect information. We can validate measured values and substitute erroneous values with the expected values during emission calculation. In such occasions, the operator gets warned. This operation contributes to a strong system.
PEMS needs little maintenance. However, you need to verify the model after maintenance performance, which controls the ignition process.

Recently, the predictive emission monitoring system was proposed as an alternative to CEM. PEMS has two merits over CEM. These include the potential to give accurate data on emission under different conditions, as well as lower charges to install and maintain. Employing an advanced computer program, engineers created a PEMS system for an ethylene boiler at Exxon chemical company Baytown, Texas.

The PEMS system has two parts. These include sensor validation and emission prediction models. The major function as the sensor validation model is to authenticate the primary data from the input sensors and reconstruct new sensor's value before we use them in the calculation model. The employment of PEMS provides a high degree of poise for the PEWS system. An independent company tested PEMS system under three firing states - low, medium, and high. The company performed a PEWS relative test audit. The test result indicated that the predictive emission monitoring system satisfied both the stringent statistical and corresponding accuracy test requirements such as t-test, F-test and r-correlation.

We define PEMS as the best obtainable technique in EU's IPP directive that has been installed on many emission sources, located mainly in Europe and North America.


Predictive emission monitoring system monitors pollutant emissions without using traditional analyzer-based continuous emission monitoring systems (CEMS). The PEMS predicts a facility’s emissions indirectly using process parameters that have a known relationship to pollutant concentration.
Posted by: Maraj | May 15, 2013, 3:03 pm
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