SYNTHESIS AND STUDY OF THE SYSTEM OF AUTOMATIC CONTROL OF THE PRESSURE OF THE GAS-AIR MIXTURE IN THE TUNNEL FURNACE FOR THE FIRING OF CERAMIC BRICKS

Abstract

The objective is to determine the regularities of the process of automatic control of the pressure of the gas-air mixture in the tunnel furnace, which will allow to adapt the process of pressure control to the changing conditions of the furnace, in particular, to the change of the pressure of the gas-air mixture in the gas pipeline of its supply to the furnace before the control valve. Method. In order to obtain the characteristics of the tunnel furnace as a control object in order to analyze the regularities of the control process based on them, simulation modeling of the processes of movement of the gasair mixture (GAM) in the tunnel furnace was used. At the same time, the real technical characteristics of pipelines and tunnel furnace are taken as initial data. The methods of the modern theory of automatic control were used to study the system of automatic control of pressure in the tunnel furnace. The research was conducted on the basis of computational experiments using computerized methods of data approximation and synthesis of automatic control systems. The results. The following scientific results were obtained during the research: – for each mode of operation of the automatic control system (working out the set point or compensation of disturbance) there are optimal settings of the PI controller, which ensure the maximum speed of the system without exceeding the maximum permissible differential by the time of the control influence; – for each disturbance value, there are optimal parameters of the PI controller, at which the maximum value of the actual differential of the control influence is equal to its maximum permissible level. At the same time, it was established that the optimal gain coefficients of both the proportional component and the integral component of the regulator depend on the magnitude of the disturbance inversely and exponentially; – it was established that with high accuracy (the relative error does not exceed 1%), the dependence of the optimal parameters of the PI controller on the disturbance value is approximated by power polynomials of the fourth order. Practical meaning. An improved method of synthesis of the system of automatic pressure control of the gas-air mixture in the tunnel furnace with the help of specialized computer tools is proposed, which involves further research of the quality criteria of the control system from the settings of the regulator. This will improve the quality criteria of transient processes during automatic pressure control of the gas-air mixture in the tunnel furnace.