SYNTHESIS OF CHEMICAL REACTOR NONLINEAR CONTROL ALGORITHM USING SYNERGETIC APPROACH

Abstract

The problem of analytical synthesis of synergetic control system of chemical reactor for realization of a complex series–parallel exothermal reaction has been solved. The synthesis of control principles is performed using the analytical design method of aggregated regulators. A chemical reactor is one of the common apparatuses in chemical industry. Despite a large number of the works related to automation and control of chemical reactors, the problem of synthesizing control systems that provide the maintenance of optimal modes of their operation remains practically unsolved. This is related to the principal feature of chemical reactors as controlled objects, namely, manifold, non-linearity, and multi-coupling. An outcome from this situation is to develop a physical theory of control, in particular synergetic control theory. The use of synergism ideas in the problems of control assumes the development and realization of a method of directed target self-organization of dissipative non-linear systems “object-regulator”. Furthermore, the aim of the motion of a system is formulated as the desired invariant manifold in a phase space of the object, which acts as a target attractor. The paper deals with continuous stirred tank reactor equipped with a mechanical stirrer and cooling jacket. The reactor operates in the polytropic mode. The multistep series-parallel exothermic process is carried out in the reactor. The objective of chemical reactor operation is to obtain the key product of specified concentration. The aim of chemical reactor control system is to maintain both concentration of desired product and temperature of reaction mixture in the device at the given values under the action of disturbances on the object. Using the analytical design method of aggregated regulators on the basis of parallel-series combination of invariant manifolds, a non-linear control algorithm was synthesized, which solves the problem of stabilization of the concentration of the target component and mixture temperature. Computer simulation of the object–regulator isolated system confirmed these properties of synthesized control system as the disturbance invariance, covariance to the given actions, and asymptotic stability. These facts make synergetic control theory very promising for application for such complex, manifold, and nonlinear objects of chemical engineering as chemical reactors. For citation:Labutin A.N., Nevinitsyn V.Yu. Synthesis of chemical reactor nonlinear control algorithm using synergetic approach.Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N2. P. 38-44.