Publication detail

Heat Exchanger Network Synthesis Considering Risk Assessment for Entire Network Lifetime

Nemet, A. Klemeš, J.J. Kravanja, Z.

Original Title

Heat Exchanger Network Synthesis Considering Risk Assessment for Entire Network Lifetime

Type

conference paper

Language

English

Original Abstract

Considering risk assessment at the early-stage of Heat Exchanger Network (HEN) synthesis can significantly contribute to obtaining inherently safer design. The development of quantitative safety metrics at the early stage of design are still at the beginning steps of development. The risk is composed of failure frequency and the severity of the consequences. There are numerous methods for determining the severity of the consequences for a certain deviation event and there are mainly index-based methods for determining the severity when inherent safety is analysed. The failure of frequency, however, is usually assumed as a constant during the entire lifetime. Observing Bathtub curve it can be concluded that different type of failures dominates at different periods during a lifetime. Therefore, considering unified failure frequency during the entire lifetime is quite problematic. The aim of this study is to obtain HEN design that exhibits improved safety during the entire lifetime. The previously developed mixed-integer nonlinear programming (MINLP) model for HEN synthesis with embedded risk assessment was upgraded to a model that considers the changing failure frequency during the lifetime. A multi-period MINLP model was developed that accounts for different failure rate within each period of the lifetime. At least three periods should be considered (early stage, random and wear out failures). More reliable results regarding HEN design with enhance safety can be obtained by considering the mentioned different failure rates and different aspects of safety (toxicity, flammability, explosiveness). The designs obtained by the enhanced HEN synthesis method are safer and economically reliable. © Copyright 2017, AIDIC Servizi S.r.l.

Keywords

Failure analysis; Heat exchangers; Integer programming; Nonlinear programming; Safety engineering; Failure frequency; Heat exchanger network; Heat exchanger network synthesis; Inherently safer design; Mixed integer nonlinear programming models; Network lifetime; Reliable results; Wear-out failure; Risk assessment

Authors

Nemet, A.; Klemeš, J.J.; Kravanja, Z.

Released

1. 6. 2017

ISBN

978-88-95608-51-8

Book

Chemical Engineering Transactions

ISBN

2283-9216

Periodical

Chemical Engineering Transactions

Number

57

State

Republic of Italy

Pages from

307

Pages to

312

Pages count

6

BibTex

@inproceedings{BUT145567,
  author="Jiří {Klemeš} and Andreja {Nemet} and Zdravko {Kravanja}",
  title="Heat Exchanger Network Synthesis Considering Risk Assessment for Entire Network Lifetime",
  booktitle="Chemical Engineering Transactions",
  year="2017",
  journal="Chemical Engineering Transactions",
  number="57",
  pages="307--312",
  doi="10.3303/CET1757052",
  isbn="978-88-95608-51-8",
  issn="2283-9216"
}