Numerical Methods for Scientists and Engineers
Numerical Methods for Scientists and Engineers
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This paper describes a systematic analysis which has been carried out on a commercial ammonia synthesis plant. Steady state and dynamic models of its performance are derived and investigated, and a new concept-the ''stability margin''-which is an extension of the ideas of Van Heerden [8] is found to lead to a fuller appreciation of the properties of the models. The accuracy of the model predictions are investigated by performing tests on the plant and it is shown how knowledge of the accuracy is important when deciding how the model should be used to improve the plant performance. Apart from the concept of a ''stability margin'' the solution of an identification problem, an experimental optimisation scheme and a control scheme for the maintenance of optimality and stability are the most important outcomes of the work.