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integrated process-unit operations, with special emphasis on system controllability. This paper discusses the optimal design and the best control structure for the process heater. Design and cot). trollability were studied as stand-alone, as well as integrated, umts. Dynamic modelling and controllability behaviour was studied using SpeedUp and Speecon software packages. The work showed that heavily integrated processes require designstage controllability analysis, which should cover complete process networks, as illustrated by the fact that the best control structure of the integrated heater came out as the least good one for the stand-alone unit.
Operating System D.M. Laing, J.W. Ponton, pp 87-93
Research into processes with improvedThe °perabilityse-has focused on providing measures or indices, are useful in selecting between alternative designs, but are principally tools for analysis rather than synthesis. This paper describes the generalisation of the established hierarchical model of process design to indude the control system and operating policy, in order to achieve design for operability. This procedure allows and encourages exploration of both process and operating-system alternatives. .The latter include .control in its broadest sense, development of an mtegrated operating strategy, and planning for expected constraints and varied demands.
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