Abstract:

Based on some features in lead-zinc sintering process，such as time-delay，nonlinearity and uncertainty，a fuzzy predictive control method for burning through point was proposed. First，to deal with the uncertainty of vertical burning velocity，a fuzzy T-S（Takagi-Sugeno）model for burning through point was established based on the piecewise linearization characteristics between burning through point and sinter strand velocity. Then，the model predictive controller was designed based on the global model obtained by the dynamic linearization method. The simulation results illustrated the effectiveness of the method proposed. The precision values of the fuzzy T-S model were respectively 89.0% and 95.0% while the allowed relative errors were within 2% and 3%. The fuzzy T-S model was much more precise than the neural network model for burning through point based on process parameters. The rise time and regulating time of the fuzzy predictive control method were respectively 9 min and 18 min which were both much shorter than those by using the fuzzy control method for burning through point in lead-zinc sintering process.