Analysis and Synthesis of Resilient Heat Exchanger Networks

Publisher Summary Most recent heat exchanger network (HEN) synthesis algorithms decompose the synthesis problem into at least two stages: targeting of minimum utilities and minimum units and synthesis of a HEN structure with minimum utility consumption and with minimum or close to minimum number of units. Most recent synthesis algorithms are also based upon the principles of the thermodynamic “pinch.” Recognition of the pinch provides great physical insight into the problem of HEN synthesis. The difficulty with these synthesis methods is that they generate HENs for fixed nominal values of the stream supply temperatures and flow rates and for assumed nominal values of the heat transfer coefficients. In general, the entire process plant should be resilient. However, in a tightly energy-integrated plant, it is especially important that the HEN be resilient; if the HEN cannot operate, then neither can the plant. This chapter reviews the systematic methods for HEN resilience analysis and discusses the procedures for synthesis of resilient HENs. The chapter also demonstrates how simple, empirical HEN resilience tests can fail and establishes the need for more systematic HEN resilience analysis methods. Several rigorous analysis methods are presented, the conditions when they are linear are stated, and special nonlinear forms are highlighted.

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