21-10-2013
Benefits of using Predictive Emission Monitoring System

Predictive Emission Monitoring System as an Alternative to Continuous Emission Monitoring System

Tons of harmful gases are released into the air and people have no choice but to breathe in this air even if they are at risk from air pollution. However, not all people are susceptible to air pollution but those with lung disease especially the elderly and children can be severely affected by high levels of air pollution. Air quality is very significant and everybody has the right to be able to breathe in clean and safe air. All kind of measures are established to positively influence air quality including planting trees along highways to capture dust particles. Legislations are in place so that businesses will monitor their emissions. Emission monitoring systems can either be PEMS or (Predictive Emission Monitoring System) or CEMS (Continuous Emission Monitoring System).

What is Predictive Emission Monitoring System?

PEMS is a software-based system of calculations of emissions where formulas can be implemented and performed online or offline. One of the advantages of PEMS is that no hardware equipment needs to be installed at the stacks and the cost of ownership is definitely lower than that of CEMS. Not only is there a lower capital expenditures but it has lower operational and maintenance costs. It is expected that PEMS can achieve the same accuracy and quality of emissions data like what can be derived by using CEMS. PEMS is interfaced with the plant process control systems and utilizes the input from the combustion or pollution control process to determine the emission rates of various pollutants that are being regulated. In this process of monitoring, no gas analyzers will be required.

Benefits of using Predictive Emission Monitoring System

The system of PEMS do not measure emissions but use a computer model to predict emission concentrations based on process data that includes fuel, flow, load and ambient temperature. The computer model is also based upon measurements at either the source or generic emission information. Not only will PEMS provide continuous information on emissions but it can improve operational efficiency while reducing emissions. When emissions are reduced, operations can be optimized so as to increase productivity. An additional benefit of PEMS is that the emission models can be used with the model based control strategies for optimization of the process in relation to operational costs and compliance margins. In the United States, several states allow PEMS to be an alternative monitoring system in compliance with certain regulations and programs. Alternatively, PEMS can provide the only way to obtain a continuous stream of emission value when there is no CEM.

Countries that use PEMS as an alternative to CEMS

  • Asia – countries in Asia with regulations that follow US EPA look for PEMS implementation as method of choice for compliance monitoring. This includes countries like Malaysia, Philippines, Singapore, Korea and others
  • Europe – Some countries in Europe use PEMS as an alternative to CEMS like the Netherlands and Ireland. Other countries that are developing PEMS applications are Germany, France, Italy and Spain.
  • Middle East – United Arab Emirates and Saudi Arabia who look to US EPA regulations as guidance prefer the practical option of PEMS

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