CEM - Abstract

Abstract Information :

U.S. EPA 40 CFR Part 60 mandates continuous monitoring of nitrogen oxides (NOx) emission rate from gas turbines of nominal size. Following promulgation of Performance Standard 16 (40 CFR Part 60 Appendix B), a predictive emission monitoring system (PEMS) may be utilized as an alternative to continuous emission monitoring systems (CEMS) in the United States. If applicable, a PEMS may also be certified under U.S. 40 CFR Part 75, Subpart E to fulfill the monitoring requirements set under the U.S Acid Rain Program. PEMS may be used for determination of emission compliance on an ongoing basis, providing the installed PEMS meets the federal performance specification criteria and the site performs ongoing quality assurance tasks such as periodic audits with portable analyzers and annual relative accuracy testing. Detailed here is the PEMS certification process for nine turbines certified under Saudi Arabia's Royal Commission of Environmental Regulation (RCER 2010), which mandates PEMS installation requirements identical to those of U.S. EPA 40 CFR Part 60 and 40 CFR Part 75. Part 60 Certification requires a minimum of twenty-seven 21-minute test runs at three loads and statistical analysis of the reference method and PEMS data to assess the accuracy and performance of a newly-installed PEMS. Part 75 certification requires a similar RATA analysis of 9 RATA runs at a normal plant load, and a Subpart E demonstration requiring analysis of 720 hours of unit operation on primary fuel along with an additional 24 hours of each secondary fuel. The use of one statistical hybrid model developed for similar units, a strategy utilized to reduce project timeline and CAPEX costs was then applied to eight of the nine turbines at a power generation plant in Saudi Arabia followed by a certification RATA for each unit utilizing the combined database. The methodology and results of these PEMS certifications utilizing the unit type or class model developed at the site is presented.