Simultaneous data reconciliation and parameter estimation. Application to a basic oxygen furnace.

Abstract

Abstract-In the steel industry, the determination of the control system set-points of batch processes is a common problem. It consists in adjusting the set-points in order to reach the given product specifications thanks to a process model. Small changes in operating conditions may impact final product quality. This is particularly true for the Basic Oxygen Furnace (BOF) where the information collected during a specific batch serves to adjust the set-points of the next batch. For being able to control that type of process, measurements must be made coherent and it may be convenient to use data reconciliation procedure. The proposed paper describes a method allowing simultaneous data reconciliation and model parameter estimation. Parameter estimation results can either be used to update the process model or to detect abnormal parameter variations due, e.g. to fouling, corrosion, degradation of parts of the process.

Nonlinear Model Identification and Data Reconciliation Using Kernel Principal Component Regression

“…The covariance matrix of errors in the measurements is assumed to be known, and the reconciled estimates of the variables are also simultaneously obtained. Similar approaches for simultaneous parameter estimation and nonlinear data reconciliation have been proposed by other researchers. − It may be noted that in all these approaches the functional relationship between variables must be known. In contrast, the approach proposed in this paper simultaneously identifies a nonlinear model and obtains reconciled estimates from noisy measurements under the EIV framework, when the functional model between the variables is not given a priori .…”

Application of data reconciliation and gross error detection techniques to enhance reliability and consistency of the blast furnace process data

“…28,29 However, very few attempts of application of DR and GED have been applied for steel industries. Some examples of application of DR and GED are those reported by Francken et al 30,31 and Luo el al. 32 for basic oxygen furnace and BF pipe network, respectively.…”