The Steady State Modeling and Simulation of the Chemical Multivariable Systems - Case Studies

摘要

The steady state mathematical modeling of the chemical processes represents an important problem, for both: design stage and chemical plants operation. A class of the chemical processes is the multivariable process systems, characterized by two manipulated variables and two output variables. For these chemical processes, the steady state model may be defined by the general non-linear equations system. The author has studied two particular chemical processes: the radiation section of the tubular heater and the shell and tube heat exchanger. The mathematical model of the radiation section of the tubular heater is developed by using the heat balance equations and the Lobo-Evans model of the heat transfer process. This mathematical model has been used to evaluate the statically characteristics and those that have represented the startup of the development of a new control system. The second case study is represented by the shell and tube heat exchanger. The solutions of this model have been used to determine the characteristics of the chemical process too.