Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (1): 5-9.DOI: 10.12068/j.issn.1005-3026.2014.01.002

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Integrated Modeling Based on Mechanism and Subspace Identification for Gas Mixing Process

YUAN Yan1,2, CAO Yuan1,2, CAO Weihua1,2, MA Xiu1,2   

  1. 1. School of Information Science and Engineering, Central South University, Changsha 410083, China; 2. Hunan Engineering Laboratory for Advanced Control and Intelligent Automation, Central South University, Changsha 410083, China.
  • Received:2013-05-07 Revised:2013-05-07 Online:2014-01-15 Published:2013-07-09
  • Contact: CAO Weihua
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Abstract: According to the characteristics of the gas mixing process, an integrated model was set up based on mechanism and subspace identification. Firstly, on the basis of analyzing the practical operation and data, the mechanism models of the gas flow of blast furnace and coke oven were acquired by applying butterfly valve flow formula. Then datadriven subspace identification method was used to set up the 4input and 1output mixing gas pressure model. The output was the pressure of the mixed gas, and the inputs were the two gas source pressures and two valves opening of No2 in the blast furnace and the code oven. At last, through analyzing the characteristics of the variables of each submodel, the two models were integrated. The simulation results showed that the model could reflect the dynamic behavior of gas mixing process, and provided reliable model for gas mixing process control.

Key words: gas mixing, mechanism modeling, subspace identification, integrated modeling, gas pressure

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