Application of Multivariate Statistical Models to Prediction of Emissions from Complex Industrial Heater Systems
Publication: Journal of Environmental Engineering
Volume 131, Issue 6
Abstract
Industrial fired heaters are a major source of nitrogen oxides ( ). On-line analyzers, kinetic models with computational fluid dynamics, and empirical predictive models have been developed to monitor emissions and analyze excessive emissions. However, previous approaches have been applied only to single heater systems, not to large-scale multiheater systems. This paper proposes a hierarchical monitoring and diagnosis procedure to monitor emissions from large-scale multiheater systems and to identify the root causes of excessive emissions as well as heater malfunctions. The procedure provides a functional three-layer hierarchy: (1) prediction of concentrations; (2) estimation of the influence of individual heaters on the predicted ; and (3) identification of the root causes by examining the detailed contributions of process variables to variations of the heater identified in step 2 as being the principal source of . An integrated multiblock partial least-squares (PLS) model, created by combining standard PLS and multiblock PLS, is employed to predict the emissions and estimate the influences of the heaters on the emissions. The validity of the proposed method is demonstrated through its application in two case studies.
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Acknowledgments
The writers gratefully acknowledge the partial financial support of the Korea Science and Engineering Foundation through the Advanced Environmental Biotechnology Research Center (Grant No. R11-2003-006) at Pohang University of Science and Technology, the IMT2000 project (Grant No. 00015993) fund of the Ministry of Information Communication, and the Brain Korea 21 Program issued from the Ministry of Education, Korea.
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© 2005 ASCE.
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Received: Apr 24, 2003
Accepted: Nov 1, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
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