Research On Intelligence Control Model And Its Simulation In Coke Oven Fule Temperature Control

Coke oven is a system of large time-delay, big inertia, strong nonlinear, many factor couplings time-varying parameter.Coking is a heating passage and metamorphosis process ,as well as complicate body structure, bad operation condition ,few detecting means ,therefore flue temperature accuracy control has a certain degree of difficulty. The stability of flue temperature in coke oven is related to coke quality and cost of production directly, that is a key and core of the coke oven heating and burning process control. Stable and homogeneous heating in coke oven has a fundamental significance to improving efficacy and the quality of coke coke, reducing energy sources consuming and extending coke oven life-span, cutting down environmental pollution in coking process of producing.By applying the linear regress theory, the relationship mode between flue temperature and top of regenerators'is built. By applying the system identification theory, the ARX mode between the flue temperature and the gas flow is established and its parameters of the mode are estimated by using the method of minimum two multiplication. Apply the basis cascade control theory, system adopts to flue temperature and coal flue gas flow as controlled parameters of host circuit and subsidiary circuit respectively.The host circuit is flue temperature optimization controlling circuit and the main effect is to ensure flue temperature stabilizing in target flue temperature nearby.By ultilizing the technology of fuzzy control, a fuzzy controller of setting gas flow is designed. The subsidiary circuit is a circuit of valve control, the main effect is to ensure that the scene coal gas flow keeping stable and following setting value , which is the basis controlling of the host circuit temperature optimiztion.The routine PID control and compound Fuzzy-PID control of intelligent control model of flue temperature are simulated respectively by applying Matlab/Simulink. The simulating curves are analyzed , the result has indicated: when the external condition produces perturbation motion because of coal gas flow or other, compound Fuzzy-PID control can restraint perturbation motion more quickly with higher robustness , less temperature fluctuation and shorter measuring time. It has verified feasibility and validity of compound Fuzzy-PID control algolithm .It is able to stabilize furnace temperature , having an effect to improve the quality of coke , reducing energy consumption and extending coke oven life-span .It has reached expect control effect.