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Processes 2015, 3(2), 257-285; doi:10.3390/pr3020257

A Novel ARX-Based Approach for the Steady-State Identification Analysis of Industrial Depropanizer Column Datasets

1
Department of Chemical Engineering, University of São Paulo, Av. Prof. Luciano Gualberto, Trav. 3, 380, São Paulo 05508-900, Brazil
2
Department of Chemical Engineering, West Virginia University, Morgantown, WV 26506, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Pannocchia
Received: 4 February 2015 / Revised: 15 March 2015 / Accepted: 2 April 2015 / Published: 22 April 2015
(This article belongs to the Special Issue Process Control: Current Trends and Future Challenges)

Abstract

This paper introduces a novel steady-state identification (SSI) method based on the auto-regressive model with exogenous inputs (ARX). This method allows the SSI with reduced tuning by analyzing the identifiability properties of the system. In particular, the singularity of the model matrices is used as an index for steady-state determination. In this contribution, the novel SSI method is compared to other available techniques, namely the F-like test, wavelet transform and a polynomial-based approach. These methods are implemented for SSI of three different case studies. In the first case, a simulated dataset is used for calibrating the output-based SSI methods. The second case corresponds to a literature nonlinear continuous stirred-tank reactor (CSTR) example running at different steady states in which the ARX-based approach is tuned with the available input-output data. Finally, an industrial case with real data of a depropanizer column from PETROBRAS S.A. considering different pieces of equipment is analyzed. The results for a reflux drum case indicate that the wavelet and the F-like test can satisfactorily detect the steady-state periods after careful tuning and when respecting their hypothesis, i.e., smooth data for the wavelet method and the presence of variance in the data for the F-like test. Through a heat exchanger case with different measurement frequencies, we demonstrate the advantages of using the ARX-based method over the other techniques, which include the aspect of online implementation. View Full-Text
Keywords: steady-state; identification; ARX; industrial processes steady-state; identification; ARX; industrial processes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rincón, F.D.; Roux, G.A.C.L.; Lima, F.V. A Novel ARX-Based Approach for the Steady-State Identification Analysis of Industrial Depropanizer Column Datasets. Processes 2015, 3, 257-285.

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