Avaliação da operabilidade estacionária e dinâmica de processos.

Abstract

The geometric approach of process operability analysis is an important technique to improve the operational feasibility of a project. Such technique allows optimizing the performance of a system in order to achieve the desired specifications. The tool allows to evaluate what are the most suitable conditions the process may be subjected and which can generate impact disturbances in the system Through desirable and achievable regions for the process variables, you can determine the operability Index, which presents as a parameter to indicate a greater tendency of the responses of the system to reach the desired values. For the application of the operability analysis it was used the mathematical modeling considering mass and energy balance and the geometric resources of the Multi-Parametric Toolbox 3.0 of MATLAB®. Two systems were used for analysis, mixing tank and CSTR reactor, where it was possible to follow the behavior of the two systems for the steady state and dynamic condition for the CSTR reactor. Moreover, it was possible to apply classical PI and advanced GMC control strategies to check the process. The steady state analysis allowed to obtain the operating conditions for mixing tank and CSTR reactor systems by obtaining the RAVS and RDVS of each case, and in addition, the evaluation of the heat generated and removed for the reactional system. It was applied a dynamic update of the steady state regions with possibility of obtaining the Operability Index throughout each time of the process. This fact demonstrates as an innovative application of the tool and allows real-time evaluation of the behavior of the process. The results provided by the application of the tool confirms it as promising for enabling the simulation of various operating conditions and decide operating ranges more viable for the process variables.