Integrated modeling for gas mixing process based on mechanism and subspace identification

According to the features of gas mixing process, an integrated modeling method based on mechanism and subspace is proposed in this paper. First, on the basis of analyzing mechanism characteristics and process data, the mechanism models of the gas flow of blast furnace and coke oven are acquired through applying butterfly valve flow characteristic formula. Then, subspace identification method is used to set up a 4-input and 1-output identification model for pressure of mixed gas. At last, through analyzing the relation among the variables of each sub-model, the mechanism model of gas flow and subspace pressure model are integrated. The simulation results verify the effectiveness and precision of the integrated model, and the characters of gas mixing process can be reflected. The study has definite significance of practical application.