Annual Guide 2022 I SOURCE TESTING ASSOCIATION
No measurement hardware or sample handling system is required in a PEMS, freeing up space while reducing physical requirements for maintenance to zero, with no compromise on accuracy. Crucially, the suitability of PEMS for emission measurement has been recognized by various regulatory authorities around the world, and recent changes to permit their use is opening new possibilities for the effective measurement and control of emissions.
Many companies offer either CEMS or PEMS solutions, but very few can do both. ABB is an example of a company that has coupled its comprehensive CEMS offering with its digital expertise to provide a wide range of solutions for all environmental applications. This helps operators to comply with regulations, reduce costs and maintenance, optimise emission monitoring, and improve system uptime.
Where and when should you use a PEMS?
Suitable applications for PEMS include gas turbines, boilers, heaters, or anything with stable processes and conditions. Conversely, applications like waste incinerators are not a good candidate for the use of PEMS due to the large potential variations that can arise from the unpredictable compositions of gases generated by incinerated waste. Whilst a PEMS can be used as a standalone solution, or as a back-up for CEMS, it should not be considered as a direct replacement. To that end, CEMS still very much have their place in the modern plant.
Benefi ts of PEMS
A key benefi t of a PEMS system is cost. Compared to an equivalent CEMS, PEMS can typically reduce lifecycle costs by up to 50 percent over a space of fi ve years. This is because the lack of any measurement-related hardware means that the purchase cost is much lower, and with no physical equipment required apart from a PC from which to operate the software, there is no need for continual equipment maintenance beyond adjusting the software model and calibrating. A PEMS also does not need
ABB’s PEMS applications take this a step further by utilizing Inferential Modeling Platform. This is the product of decades of experience in emission monitoring and modeling applications to provide an easy-to-use, powerful and effi cient tool to develop and deploy advanced mathematical models and to deliver the specifi c functionalities prescribed by the environmental regulations (e.g. US EPA Performance Specifi cation 16, EU TS-171198).
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replacing as any changes can be managed through updates to the software, server or operating system.
Another benefi t is speed of implementation. PEMS can be installed more quickly, with less training required to be able to use the system. As long as the system has an online connection, it can be operated remotely either by in-house staff or a third party.
While a CEMS can fl ag up excess emission levels, it typically does not provide any insight as to why they have occurred. In contrast, a PEMS can use dynamic set points to trigger alarms based on information inferred from historical events. The more data the system parses over time, the more accurate it can become.
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