Approaches and principles for advanced control of multi-flow tube furnace

To improve the efficiency of multi-flow tube furnaces, a multi-parameter advanced cohesive control system is proposed. Stabilization of the main technological parameter, i.e. the resulting temperature of the output material flow, is carried out by supervisory control of flow rates on the inlet coils, taking into account the existing limitation on the loading of the apparatus, while meeting the requirement of a uniform temperature profile. To create an optimal combustion mode, an additional circuit for regulating the discharge in the radiant chamber of the furnace on the line of atmospheric air supply to the burner registers according to the residual oxygen content in the flue gases is introduced. In the developed simulation model of the control system the possibility of shockless transition between the basic, as in production, and advanced variants of the control system is realized. Transfer functions of the multilink control object, as well as the tuning parameters of the regulators on individual channels are obtained by the built-in tools of Matlab Simulink. Computational experiments on the model showed high speed and control accuracy.