Flexibility Assessment of Heat Exchanger Networks: From a Thorough Data Extraction to Robustness Evaluation - Archive ouverte HAL Access content directly
Journal Articles Chemical Engineering Research and Design Year : 2018

Flexibility Assessment of Heat Exchanger Networks: From a Thorough Data Extraction to Robustness Evaluation

Raphaële Théry Hétreux
Gilles Hetreux
  • Function : Author
  • PersonId : 967397
Florent Bourgeois
Pascal Floquet

Abstract

Due to process variabilities and operational modifications, operating parameters of Heat Exchanger Network (HEN) may alter its output temperatures. Nevertheless, the impact of these disturbances depends largely on the topology of the HEN. As a consequence, it can be relevant to evaluate the flexibility of a HEN after its synthesis. Flexibility of a HEN refers to the ability of a system to operate at a finite number of set points. In this framework, the implementation of this property is broken down into several aspects. In this contribution, the first level of flexibility concerning the robustness (ability of the system to absorb disturbances without changing utility flowrates) is addressed and compared to other contribution, this criterion is not formulated as a generic one but as a criterion that strongly depends on the studied process. As a consequence, to evaluate its value, the first step is to perform an enhanced data collection by identifying the most frequent disturbances and by pointing out the critical streams i.e. the streams whose output temperature absolutely needs to be kept into a strict interval; then, given this information, a robustness criterion can be formulated for a given HEN. In this paper, a methodology relying on several models is developed to address this issue: a Mass Equilibrium Summation enthalpy non-linear model (MESH) dedicated to the enhanced data collection, a Mixed Integer Linear Programming (MILP) model used for the HEN synthesis and finally a linear model developed for the modeling of the HEN response to disturbances. This methodology is first illustrated through a basic academic example and finally applied to an industrial case study.
Fichier principal
Vignette du fichier
Payet_20898.pdf (3.58 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01886929 , version 1 (03-10-2018)

Identifiers

Cite

Lucille Payet, Raphaële Théry Hétreux, Gilles Hetreux, Florent Bourgeois, Pascal Floquet. Flexibility Assessment of Heat Exchanger Networks: From a Thorough Data Extraction to Robustness Evaluation. Chemical Engineering Research and Design, 2018, 131, pp.571-583. ⟨10.1016/j.cherd.2017.11.036⟩. ⟨hal-01886929⟩
85 View
122 Download

Altmetric

Share

Gmail Facebook X LinkedIn More