Title: Multisegment pulverised coal mill model and online implementation for condition monitoring

Authors: Jianlin Wei, Jihong Wang, Q.H. Wu, Jian Chen, Nan Jia

Addresses: Department of Electrical Engineering and Electronics, University of Liverpool, Brownlow Hill, Liverpool L69 3GJ, UK. ' Department of Electrical Engineering and Electronics, University of Liverpool, Brownlow Hill, Liverpool L69 3GJ, UK. ' Department of Electrical Engineering and Electronics, University of Liverpool, Brownlow Hill, Liverpool L69 3GJ, UK. ' Department of Electrical Engineering and Electronics, University of Liverpool, Brownlow Hill, Liverpool L69 3GJ, UK. ' Department of Electrical Engineering and Electronics, University of Liverpool, Brownlow Hill, Liverpool L69 3GJ, UK

Abstract: This paper presents a new multisegment coal mill mathematical model, which covers the whole milling process from mill start-up to shutdown. This model is initially derived through analysing energy transfer, heat exchange and mass flow balances of a coal mill. Evolutionary computational techniques are then adopted to identify the unknown system parameters. After the model was tested offline, it was converted into a discrete-time form for the purpose of online implementation. A shared-memory technique is employed to accommodate the measurement data dynamically in realtime, which provides a generic platform to communicate with different software environments used by different mill plants. A user-friendly interface is designed to satisfy the requirement specified by the plant engineers. The model can be used to improve the combustion process control and fault diagnosis.

Keywords: genetic algorithms; GAs; system identification; system modelling; nonlinear systems; coal mill modelling; online implementation; condition monitoring; pulverised coal milling; energy transfer; heat exchange; mass flow balances; combustion process control; fault diagnosis.

DOI: 10.1504/IJMIC.2006.011944

International Journal of Modelling, Identification and Control, 2006 Vol.1 No.3, pp.206 - 214

Published online: 03 Jan 2007 *

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