|Abstract Title:||Modern approach towards cold extractive CEM systems under rapidly changing emission regulatory requirements in developing nations|
|Session Choice:||Continuous Emission Monitoring|
|Presenter Name:||Mr Craig Sunada|
|Co-authors:||Mr Sanjeev Rai|
|Company/Organisation:||Perma Pure LLC|
Abstract Information :
The majority of reliability problems associated with cold-dry extractive CEMS can be traced back to the conditioning system. In order to reach the reliability objectives for compliance with the India regulations with acceptable levels of maintenance, new approaches to the CEMS system design should be considered. The accuracy of the CEMS is also significantly impacted by the sample conditioning system. The water solubility of SO2 (and a lesser degree NOx) creates significant losses of these analytes when condensing cooler systems are used for lower levels of emission's, and with stack gasses high in moisture content. As the emissions targets in India are lowered, wet FGD and ESP deployment will make sample conditioning and measurement even more challenging. SO2 retention data from the lab and in the field will be presented for Nafion-based systems showing excellent performance even at low levels of SO2 and high moisture content. This paper will present some of the CEMS failures encountered in the field associated with sample conditioning as well as sample conditioning considerations for improving CEMS accuracy.
Successful Nafion-based sample conditioning enables cost-effective portable emissions monitoring and auditing, which can be much faster and more efficient than traditional manual sampling methods and central lab-based sample analysis. Nafion based conditioning systems have demonstrated robust performance in challenging conditions, and can eliminate several major sources of problems commonly encountered, including heated line failures, sample line clogging due to salt formation and liquid water hitting the gas analyzers. This paper will share experience deploying sample conditioning systems in China to enable low cost, efficient stack testing in support of a rapidly changing regulatory and CEMS environment.