Reconfiguration of control system of the gas mixture temperature at the furnace outlet of the catalytic reforming unit according to exploitation data of technological object

The approach and results of an experiment on reconfiguration of an automatic control system and calculation of a combined control system based on the proposed method for identifying technological objects according to explotation data are presented. Structural and parametric identification of the object is carried out in the form of transfer functions based on the obtained frequency response. To assess the reliability of the identification of the control object, a simulation model is constructed that predicts the behavior of the controlled variable taking into account the influence of disturbing influences. The output signal of the model is a controlled parameter. Based on the results of the identification, the combined system is calculated. The condition for approximating the ideal compensating device is the compliance of the complex frequency responses at zero and resonant frequencies. To evaluate the results of building a combined system, simulation model of suppressing disturbances before and after the introduction of compensator is constructed. The advantages of the presented method of identifying the control object are passive experiment, high accuracy of the synthesized model of the object and ability to calculate a compensating device that can reduce fluctuations of the adjustable parameter. To demonstrate the described method for constructing combined control systems, the automatic control system of the temperature of the flow of a gas-feed mixture at the outlet of furnace of a catalytic reforming unit was reconfigured. Root-mean-square error and maximum outburst decreased from 3,769 °C and 0,439 °C to 0,207 °C and 0,027 °C after the introduction of the combined system.

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