Керування випарюванням в апараті зануреного горіння

Abstract

Considerable part of chemical-technological processes are dynamic systems with many controlled variables. These variables are interrelated through control object. Settings automatic regulators such control objects without regard to their internal relations can lead to instability of the system of automatic control. To maintain the stability of automatic control system, it is necessary to reduce the gain of the automatic controls, but decreases performance and deteriorating quality and process control. To ensure the quality of the control systems automatic regulation of interdependent controlled variables, it is necessary to compensate for the impact of internal relations in the control object. This can be done by introduction digital compensators in the system. The purpose of this article is to analyze the structure of the control system in the process of evaporation apparatus of immersed burning and calculation of compensators transfer functions. An example of object with many interrelated controlled variables is apparatus of immersed burningin which it is necessary to adjust the level and concentration. Submerged burning evaporator is type of control object with two interdependent cross-links. Concentration of the solution depends not only on the amount of evaporated water, but also on the height of the liquid level in the machine. Number of evaporated water is guided coolant supply. To compensate the cross-linking between these variables must enter compensators in automatic control system. Then change one value does not lead to a change in another. Transfer functions of feedback control systems of liquid level and the concentration in the apparatus is composed. Laplace transform of controlled variables is found. Used conditions of absence influence on the automatic regulation of the concentration of the liquid in the liquid level automatic control system in the apparatus and vice versa. System of equations is compiled. The solution of system of equations gives the transfer functions of digital controllers and digital compensators. The study of dynamic properties of two-dimensional system of automatic control of interdependent variables show that for independent control of each variable, it is necessary to implement a «separation» with digital controls and digital compensators. Transfer functions and frequency responses of cylindrical heat storage walls as plants with distributed parameters depending on boundary conditions on external and internal surfaces are presented. Obtained results can be used for control systems synthesis. Keywords: submerged combustion evaporator, two-dimensional object, control system