Design of a test rig for the simulation of startup procedures in main heat exchangers of air separation plants

Haider, Patrick; Freko, Pascal; Lochner, Stefan; Reiter, Thomas; Rehfeldt, Sebastian; Klein, Harald

doi:10.1016/j.cherd.2019.04.025

Cited by 12 publications

(17 citation statements)

References 5 publications

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“…Der im Rahmen des Projektes „FlexASU“ entworfene Prüfstand beinhaltet zwei gelötete PFHE aus Aluminium, die mit einer Masse von etwa 1,5 t hinreichend groß sind, um einen HWÜ einer realen LZA zu repräsentieren 2. Ein vereinfachtes Fließbild des Prüfstands ist in Abb.…”

Section: Detailbetrachtung: Dynamischer Betrieb Eines Plattenwärmeübeunclassified

“…Diese resultieren im schlimmsten Fall in einer mechanischen Schädigung des HWÜ . Um die Schadensmechanismen detailliert zu untersuchen, wurde ein Prüfstand für PFHE thermisch, fluiddynamisch und mechanisch ausgelegt, gefertigt, montiert und in Betrieb genommen [2]. Der Prüfstand ist mit umfangreicher Messinstrumentierung ausgerüstet, wodurch dreidimensional aufgelöste Temperatur-und Dehnungsfelder im dynamischen Betrieb gewonnen werden.…”

Section: Introductionunclassified

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Flexibler Betrieb von Luftzerlegungsanlagen

Klein

Fritsch

Haider

et al. 2020

Chemie Ingenieur Technik

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Vor dem Hintergrund der Energiewende wird die aktuelle Forschung zum energieoptimalen, lastflexiblen Betrieb von Luftzerlegungsanlagen beschrieben. Zum einen wird ein realitätsgetreuer, druckgetriebener Ansatz zur dynamischen Simulation vorgestellt. Auf dessen Basis wird ein detailliertes, transientes Simulationsmodell einer realen Luftzerlegungsanlage, ein digitaler Zwilling, erstellt. Exemplarisch werden Simulationen extremer Betriebsszenarien, wie das Anfahren oder Abschalten des Hauptwärmeübertragers, der Trennkolonnen und der gesamten Luftzerlegungsanlage, beschrieben. Zum anderen wird die Lebensdauer des Hauptwärmeübertragers aufgrund der hohen thermischen Wechselbelastung mithilfe eines Prüfstands untersucht. Die aufgenommenen Daten dienen zur Ableitung und Validierung dreidimensionaler Simulationsmodelle.

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Section: Detailbetrachtung: Dynamischer Betrieb Eines Plattenwärmeübeunclassified

Section: Introductionunclassified

Flexibler Betrieb von Luftzerlegungsanlagen

Klein

Fritsch

Haider

et al. 2020

Chemie Ingenieur Technik

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“…This is why a method of assessing the thermal stress caused by transient operating conditions has been developed [8]. The method consists of a thermo-fluid dynamic simulation and a subsequent finite elements analysis, and is described in [6,[9][10][11] in more detail. The method has already been validated against heat exchangers in the field [6] and experimental thermal fatigue tests using comparatively small PFHEs [12].…”

Section: Introductionmentioning

confidence: 99%

“…The test rig should be capable of recording 3D temperature and strain data in transient operation conditions and detecting time and location of the appearance of a provoked fatigue damage, which is why it is extensively equipped with measurement technology. The design of the test rig is described in [10]. Now, since the test rig has been built and put into operation, this paper will provide additional information about structure and operation of the test rig and, in particular, describe the installed, partially advanced measurement systems including some exemplary results.…”

Section: Introductionmentioning

confidence: 99%

A Cryogenic Test Rig for Dynamically Operated Plate‐Fin Heat Exchangers

Fritsch

Hoffmann

Flüggen

et al. 2021

Chemie Ingenieur Technik

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.Flexible operation of air separation units may lead to enhanced thermal stress on the main heat exchanger, typically an aluminum plate-fin heat exchanger. Hence, a large, cryogenic test rig has been built to investigate fatigue effects of dynamic operation. Nitrogen streams at -175°C and 50°C are applied to induce a highly repetitive series of temperature changes in two plate-fin heat exchangers, which are extensively equipped with measurement technology to collect 3D temperature and strain data and to detect the provoked fatigue damages. Results of the measurements will be used to improve computational lifetime estimation tools.

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“…Cryogenic processes, though complex in nature, are more efficient and cost-effective. They are widely applied on industrial scale for production of high-purity oxygen and nitrogen gases from air [5,6,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis

et al. 2020

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Cryogenic air separation processes are widely used for the large-scale production of nitrogen and oxygen. The most widely used design for this process involves two distillation columns operating at different pressures. This work focuses on the selection of suitable cryogenic air separation process by evaluating seven alternative designs of the two-column air separation process based on detailed exergy analysis. The feed conditions (500 tons/h, and 50% relative humidity of air), product purities (99 mole% for both nitrogen and oxygen), and operational conditions (pressures of both distillation columns) are kept same in all designs. The two cryogenic distillation columns in each configuration are heat-integrated to eliminate the need for external utilities. Steady-state simulation results are used to calculate the exergy efficiency (%) of each equipment as well as its contribution toward the overall exergy destruction rate (kW) of the process. The results show that the compression section is a major source of exergy destruction, followed by the low-pressure column, and the multi-stream heat exchanger. A Petlyuk-like configuration, labeled as C1, provides the lowest exergy destruction rate.

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Design of a test rig for the simulation of startup procedures in main heat exchangers of air separation plants

Cited by 12 publications

References 5 publications

Flexibler Betrieb von Luftzerlegungsanlagen

Flexibler Betrieb von Luftzerlegungsanlagen

A Cryogenic Test Rig for Dynamically Operated Plate‐Fin Heat Exchangers

Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis

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