Simulação estatica e dinamica de colunas de destilação, aplicada a sistemas multicomponente a base de etanol e agua

AUTOR(ES)
DATA DE PUBLICAÇÃO

1985

RESUMO

The basic structures of the static and dynamic models of distillation columns as well as the utilized methodology for their implementation and some difficulties associated to the simulation are presented and discussed. The models are used for static and dynamic simulation of atypical alcohol distillation column and applied in the analyses of the system behaviour for a given control configuration. The UNIQUAC and UNIFAC methods are used in connection for determining the thermodynamics of the liquid-vapor equilibrium, generalizing the simulation for mixtures with thermodynamical data not available in the literature. For the simulation of the distillation column in steady-state conditions, one has used the Naphtali-Sandholm method and, also, the Alternative method, here defined, based in the sequence of different decisions presented by Friday-Smith. A comparison between the numerical solutions of the two methods shows a close proximity for the calculated profiles. Nevertheless, in terms of computational time, the Naphtali-Sandholm methods resulted faster. In the unsteady simulation, two methods are utilized for the integration of the mass balance equations: the modified Euler method and the Runge-Kutta method. Both have shown to be equivalent in terms of precision of the results. As far as computational time, the modified Euler method has shown to be faster. The dynamic simulation of the distillation column for ethanol and water in open loop has shown that, for the introduced perturbation, the response time lies between 120 and minutes. The dynamic simulation in closed loop has shown in the indicated conditions, the control system has a stable behavior

ASSUNTO(S)

destilação - industria destilação engenharia quimica

ACESSO AO ARTIGO

Documentos Relacionados