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Application of minimum-variance control strategies on an ammonia plant

Authors
Journal
Computers & Chemical Engineering
0098-1354
Publisher
Elsevier
Publication Date
Volume
12
Issue
4
Identifiers
DOI: 10.1016/0098-1354(88)85041-5
Disciplines
  • Mathematics

Abstract

Abstract A comprehensive computer control scheme, based on multivariable control theory, has been successfully commissioned on AECI's No. 3 Ammonia Plant at Umbogintwini, South Africa. A system of linear differential equations was derived in or Although a free choice of state variables was exercised, “optimal” gain matrices obtained by solution of the Riccati equation gave an easy means of Software was considerably simplified by this choice of a uniform multivariable control format for all areas. Additional software effort was involved in Complex modelling procedures were necessary in order to eliminate dead time lags and provide continuous estimates of certain state variables.

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