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Revista de Chimie (Rev. Chim.), Year 2007, Volume 58, Issue 4,





Measurement of Plant Flexibility

Abstract:

Operational flexibility is an important consideration when designing and operating a chemical plant. Very often, flexibility is concerned with insuring feasible steady-state operation over a variety of operating uncertainties. To quantify how flexible a process is, various metrics have been developed. However, these metrics are either too difficult to compute or unable to provide comprehensive evaluation. This paper aims at introducing a new process flexibility metric. Flexibility is reckoned as the feasible space’s (Sf ’s) size in which the uncertain parameters can be feasibly handled. A new flexibility index (FIV) is defined as the size ratio of Sf to the overall space (So) bounded by the uncertain parameters’ expected limits. The FIV measures the entire space where all uncertain parameters can be freely moved. An algorithm used for evaluating FIV is provided. Examples are presented to demonstrate the applications of FIV and compare this with other flexibility measurements. Keywords: operational flexibility, steadz-state operation, comprehensive evaluation


Issue: 2007, Volume 58, Issue 4
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