Abstract
In this paper, a simple modification to sequential-modular flowsheeting programmes is proposed. The modification, which involves the incorporation of Broyden's method for the iterative solution of sets on nonlinear equations, allows the user of the programme to pose design problems, where some equipment parameters are left unspecified, and values for them are found which meet desired specifications on the process. The modified programmes will solve such problems efficiently, and so will identify those which are badly posed, i.e. the equations describing the problem do not form an independent set. Some examples of design problems are solved usimg a programme based on CHESS. The results show the power of the proposed method; comparisons with the traditional control block approach are given.
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