Patent ID: 6607577
Filing Date: 2003-08-19
Classification: C21C

Abstract:
A method for determining the amounts of reagents required in the desulphurization of a hot metal batch, the method including the following steps:a) acquiring historical values of process parameters; b) selecting training data from said historical values of process parameters to represent normal operation of a desulphurization station; c) developing a multivariate statistical model corresponding to normal operation of the desulphurization station with input from said training data; d) acquiring on-line values of process parameters during operation of the desulphurization station; and e) calculating an output vector to predict required amounts of desulphurization reagents using said multivariate statistical model, and updating said multivariate statistical model over a predetermined period of operation by; f) acquiring a set of recent complete data records including measured amounts of desulphurization reagents added to hot metal and measured final sulphur contents in hot metal over said predetermined period of operation; g) selecting said data records that represent typical operation; h) creating an updated multivariate statistical model based on the said selected data records using a model adaption scheme; i) comparing said updated multivariate statistical model to the existing multivariate statistical model to determine whether the models are consistent and any changes in the updated multivariate statistical model are small; and j) replacing the existing multivariate statistical model with said updated multivariate statistical model if the updated multivariate statistical model is consistent with the model it is replacing.