Set-point optimization and control of coal-pulverizing systems with ball-tube mill

Stable control of a coal-pulverizing system with ball-tube mill usually cannot be hold due to some disturbances, such as coal hardness and steel ball wearing, etc. A hierarchical structure with a direct control layer and a set-point optimization layer is applied to this typical system. Based on steady-state gain models of different operating points, a grid search method is employed to calculate optimal set-point values at the optimization layer, and then a block decoupling multivariable controller is easily implemented at the direct control layer. The proposed structure and strategy are readily available to the industrial field engineers. Simulation results demonstrate the effectiveness of this control strategy.

[1]  Alain Vande Wouwer,et al.  Modeling and control of cement grinding processes , 2003, IEEE Trans. Control. Syst. Technol..

[2]  Yi Guo,et al.  Nonlinear decentralized control of large-scale power systems , 2000, Autom..

[3]  Shaoyuan Li,et al.  Decentralized closed-loop parameter identification for multivariable processes from step responses , 2005, Math. Comput. Simul..

[4]  Jianhong Lu,et al.  A study of control strategy for the bin system with tube mill in the coal fired power station. , 2002, ISA transactions.

[5]  V. R. Radhakrishnan Model based supervisory control of a ball mill grinding circuit , 1999 .

[6]  Tianyou Chai,et al.  Intelligent Decoupling PID Control of a Class of Complex Industrial Processes , 2006, 2006 6th World Congress on Intelligent Control and Automation.

[7]  Pu Han,et al.  Optimal for ball mill pulverizing system and its applications , 2002, Proceedings. International Conference on Machine Learning and Cybernetics.

[8]  Michael H. Moys,et al.  Steady state inferential modeling of temperature and pressure in an air-swept coal pulverizing ball mill , 2009 .

[9]  R. Schnatz,et al.  Optimization of continuous ball mills used for finish-grinding of cement by varying the L/D ratio, ball charge filling ratio, ball size and residence time , 2004 .

[10]  Wenjian Cai,et al.  Robust decentralized parameter identification for two-input two-output process from closed-loop step responses , 2005 .

[11]  Piotr Tatjewski,et al.  Advanced Control of Industrial Processes: Structures and Algorithms , 2006 .

[12]  W. Cai,et al.  Equivalent transfer function method for PI/PID controller design of MIMO processes , 2007 .

[13]  Zhi-gang Su,et al.  Experimental investigation of vibration signal of an industrial tubular ball mill: Monitoring and diagnosing , 2008 .