(657b) Incorporating Process Safety in Heat Exchanger Network Synthesis
The traditional HEN synthesis literature primarily focuses on the economics of a network . This may result in configurations that significantly increase the likelihood of a tube rupture. To counter this, there exists methods that can predict the pressure profile, and hence the severity, of a tube rupture . This work proposes a metric to examine the safety of a network. A minimum threshold value can be established, which ensures a network is protected from the potential for overpressure. The possibility of a tube rupture is performed on every exchanger for every possible network. The consequence of the tube rupture is examined with different pressure relief valve sizes. Due to a tube rupture scenario being a dynamic event, accurate modeling requires simultaneously solving a series of nonlinear algebraic and partial differential equations (NAPDE). These equations are solved offline, and then imported to the HEN superstructure. The end result is a cost-effective HEN that achieves adequate protection from the possibility of a tube rupture.
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