Medium density control for coal washing dense medium cyclone circuits

Lijun Zhang; Xiaohua Xia; Jiangfeng Zhang

doi:10.1109/TCST.2014.2349793

Medium density control for coal washing dense medium cyclone circuits

Lijun Zhang, Xiaohua Xia, Jiangfeng Zhang

Electronic And Electrical Engineering

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Abstract

The dense medium cyclone (DMC) process used in coal beneficiation plants is studied from a control system perspective. Employing the dynamic model of the DMC process derived from mass flow balance, a model-based control strategy is proposed. The controller adjusts the density of medium used to enhance separation in the DMC process according to measurements on percentages of different components in raw coal. The first objective of the control is to maintain the carbon content in the clean coal to a set level. The second purpose is to minimize energy consumption of the DMC process in view of the fast increasing electricity price. The controller solves an optimization problem formulated to determine the density of medium whenever new measurements are available. Both coal quality and DMC operational constraints are accounted for. Simulations, based on measured plant data, are carried out to verify the feasibility and effectiveness of the control strategy designed. The results show that the designed controller is able to fulfill its purpose satisfactorily when the characteristics of the raw coal varies and when measurement uncertainties are in presence.

Original language	English
Pages (from-to)	1117-1122
Number of pages	6
Journal	IEEE Transactions on Control Systems Technology
Volume	23
Issue number	3
Early online date	17 Apr 2015
DOIs	https://doi.org/10.1109/TCST.2014.2349793
Publication status	Published - May 2015

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Keywords

control system synthesis
measurement uncertainty
coal beneficiation plants
coal quality
coal washing dense medium cyclone circuits

Cite this

Zhang, L., Xia, X., & Zhang, J. (2015). Medium density control for coal washing dense medium cyclone circuits. IEEE Transactions on Control Systems Technology, 23(3), 1117-1122. https://doi.org/10.1109/TCST.2014.2349793

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abstract = "The dense medium cyclone (DMC) process used in coal beneficiation plants is studied from a control system perspective. Employing the dynamic model of the DMC process derived from mass flow balance, a model-based control strategy is proposed. The controller adjusts the density of medium used to enhance separation in the DMC process according to measurements on percentages of different components in raw coal. The first objective of the control is to maintain the carbon content in the clean coal to a set level. The second purpose is to minimize energy consumption of the DMC process in view of the fast increasing electricity price. The controller solves an optimization problem formulated to determine the density of medium whenever new measurements are available. Both coal quality and DMC operational constraints are accounted for. Simulations, based on measured plant data, are carried out to verify the feasibility and effectiveness of the control strategy designed. The results show that the designed controller is able to fulfill its purpose satisfactorily when the characteristics of the raw coal varies and when measurement uncertainties are in presence.",

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AB - The dense medium cyclone (DMC) process used in coal beneficiation plants is studied from a control system perspective. Employing the dynamic model of the DMC process derived from mass flow balance, a model-based control strategy is proposed. The controller adjusts the density of medium used to enhance separation in the DMC process according to measurements on percentages of different components in raw coal. The first objective of the control is to maintain the carbon content in the clean coal to a set level. The second purpose is to minimize energy consumption of the DMC process in view of the fast increasing electricity price. The controller solves an optimization problem formulated to determine the density of medium whenever new measurements are available. Both coal quality and DMC operational constraints are accounted for. Simulations, based on measured plant data, are carried out to verify the feasibility and effectiveness of the control strategy designed. The results show that the designed controller is able to fulfill its purpose satisfactorily when the characteristics of the raw coal varies and when measurement uncertainties are in presence.

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Zhang-etal-IEEE-TCST-2015-Medium-density-control-for-coal-washing-dense-mediumAccepted author manuscript, 351 KB