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Received August 28, 2006
Accepted March 9, 2007
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Modeling and coordinative optimization of NOx emission and efficiency of utility boilers with neural network
Key laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
Korean Journal of Chemical Engineering, November 2007, 24(6), 1118-1123(6), 10.1007/s11814-007-0131-6
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Abstract
An empirical model to predict the boiler efficiency and pollutant emissions was developed with artificial neural networks based on the experimental data on a 360MW W-flame coal fired boiler. The temperature of the furnace was selected as an intermediate variable in the hybrid model so that the predictive precision of NOx emissions was enhanced. The predictive precision of the hybrid model was improved compared with the direct model. Three optimal operational objects were proposed in order to minimize the fuel and environmental costs. Based on the neural network model and optimal objects, a genetic algorithm was employed to seek real-time solution every 30 seconds. Optimum manipulated variables such as excess air, primary air and secondary air were obtained under different optimal objects. The above algorithm interconnected with a distributed control system (DCS) formed the supervisory control and achieved real-time coordinated optimization control of utility boilers.
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References
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Kouprianov VI, Renewable and Sustainable Energy Reviews, 9, 474 (2005)
Li K, Thompson S, Proceedings of the 3rd World Congress on Intelligent Control and Automation, 992 (2000)
Fang XT, Ye NY, J. Huazhong Univ. of Sci. & Tech. (Nature Science Edition), 12 (2003)
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Han LQ, Theory, design and application of artificial neural networks, Chem industry Press (2002)
Reinschmidt KF, Ling B, Proceedings of the American Power Conference, 354 (1994)
Wang L, Intelligent optimization algorithms and applications, Tsinghua Univ. Press (2004)
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Fang KT, Orthogonal and uniform experiment design, Beijing, Science Press (2001)
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Feng JK, Shen YT, Boiler principle and calculation, Science Press (1992)
