Development of a piecewise linear model of the oxidative pyrolysis process for the control system synthesis

Abstract

The efficiency of acetylene production by oxidative pyrolysis of natural gas substantially depends on compliance with the requirements to safety and effectiveness of functioning of the chemical and technological processes; wherefore there is a need for development of new approaches to diagnostics of states and to effective management of the considered process safety. For this purpose, functioning of chemical and technological process is considered as the sequential scheme of change of its states on some time interval. The condition of system in each instant is characterized by a set of process parameters. The area of process operating state is defined by sets of technological, design data and management parameters. For the processes in the oxidative pyrolysis reactor, for well-timed detection of the violations, leading to non-staff situations, according to the equations of the mass and heat balances, restrictions of piecewise linear models on the basis of a state division method are defined, and also the area and the center of safety are revealed. At emergence of any perturbations the center of safety can be displaced therefore the primal problem of a process control system consists of transfer of a management object to another state, steady from the point of view of ensuring technological safety, when maintaining of the required characteristics of the received product. With use of the received model the process control system of an oxidative pyrolysis is synthesized in which calculation of the technological safety center is carried out according to the criterion made taking into account a task power - and resource-saving. At the same time input data are the parameters received from objects of management concerning which the problem of non-linear programming for area definition and the safety center then proceeding from values of the revolting parameters values of settings for regulators are defined which develop the operating impacts on the corresponding actuation mechanisms.