Desenvolvimento de sensor virtual empregando redes neurais para medição da composição em uma coluna de destilação. / Soft sensor development using neural networks for inferential composition in a distillation column.

AUTOR(ES)

Diogo Rafael Prado Zanata

DATA DE PUBLICAÇÃO

2005

RESUMO

Soft sensors for composition inference models (that are responsible for the quality) of distillation column products, correspond to virtual instruments implemented in software. This software is able to estimate, in real time, the composition of the output products of the column, based on information such as temperature and pressure on several points of the column and on input, output and recycle flow. The purpose of this work is to obtain a soft sensor that estimates the instantaneous composition of the product at the top of a multicomponent distillation column with a partial condenser, employing artificial neural networks. The chosen architecture was the feedforward neural network with three layers. It was chosen based on many tested options. It was developed a dynamical simulator of this column for data acquisition based on a non-linear model. In this study, it was included an investigation about the influence of partial training in the performance of the soft sensor. The goal is to study the results achieved in the case of a soft sensor trained beforehand, with data acquired from the simulator of this column. This procedure makes possible to have an operational soft sensor, trained based on a simulated data set or on a small amount of points and then retrained when a real or larger data set is available. Another important contribution is the study performed about the main errors that may appear in this kind of sensor. These errors are rarely mentioned in scientific papers. It also aims at implementing techniques to enable detection and correction of those errors that the soft sensor may present, and that affect the performance of the soft sensor, changing its precision and making it inadequate for inferential control.

ASSUNTO(S)

redes neurais soft sensor coluna de destilação neural network composition estimator inferência da composição soft sensor distillation column sensor virtual

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