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

被引：14

作者：

Haider, Patrick ^{[1
]}

Freko, Pascal ^{[2
]}

Lochner, Stefan ^{[2
]}

Reiter, Thomas ^{[2
]}

Rehfeldt, Sebastian ^{[1
]}

Klein, Harald ^{[1
]}

机构：

[1] Tech Univ Munich, Dept Mech Engn, Inst Plant & Proc Technol, D-85748 Garching, Germany

[2] Linde AG, Engn Div, D-82049 Pullach, Germany

来源：

CHEMICAL ENGINEERING RESEARCH & DESIGN | 2019年 / 147卷

关键词：

Air separation unit; Plate-fin heat exchanger; Lifetime; Test rig; Dynamic simulation; Flexible operation;

D O I：

10.1016/j.cherd.2019.04.025

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Within the Kopemikus project "SynErgie", the sub-project "FlexASU" investigates an enhancement of the load flexibility of air separation units with the goal of synchronizing their power consumption with the availability of renewable energy sources. The main heat exchanger of these plants was identified as a key component for a dynamic plant operation, because startup, shutdown and load-change procedures can lead to thermal stress and an increased lifetime consumption of the apparatus. Aluminum-brazed plate-fin heat exchangers (PFHE) are used in these plants because of their high process integration, low production cost and compact design. The main focus of this work, which is an extended version of Haider et al. (2018a), is the transient behavior of PFHE. The temperature profiles within a PFHE can be calculated, and a FEM-based model is available for investigation of the thermal stress induced by dynamic temperature changes in the apparatus. Hence, the reduction in lifetime due to certain dynamic plant operating scenarios can be estimated, and critical operating modes can be identified. For the further development of the model, a PFHE test rig is designed which is representative of extreme operating conditions in air separation units. A test scenario matching the conditions of plant startup after extended downtime in a cold state has been designed. The scenario leads to thermal stress that is expected to damage the PFHE within a few weeks of testing. The location of maximum stress in the FEM-model matches typical cracks observed in PFHE which have been exposed to severe thermal stress. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

引用

页码：90 / 97

页数：8

共 19 条

[11]

Holzl R., 2012, ASME PRESS VESS PIP

[12]

Holzl R., 2013, PRESS VESS PIP C PAR

[13]

Kays W.M., 1984, COMPACT HEAT EXCHANG, V3rd

[14] Thermodynamic properties of air and mixtures of nitrogen, argon, and oxygen from 60 to 2000 K at pressures to 2000 MPa [J].

Lemmon, EW ;

Jacobsen, RT ;

Penoncello, SG ;

Friend, DG .

JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA, 2000, 29 (03) :331-385

[15]

Linde, 2018, AL PLAT FIN HEAT EXC

[16] Energy and cost optimization of a plate and fin heat exchanger using genetic algorithm [J].

Najafi, Hamidreza ;

Najafi, Behzad ;

Hoseinpoori, Pooya .

APPLIED THERMAL ENGINEERING, 2011, 31 (10) :1839-1847

[17] The thermal expansion of pure metals copper, gold, aluminum, nickel, and iron [J].

Nix, FC ;

MacNair, D .

PHYSICAL REVIEW, 1941, 60 (08) :597-605

[18] A history of fatigue [J].

Schutz, W .

ENGINEERING FRACTURE MECHANICS, 1996, 54 (02) :263-300

[19]

Woitalka R., 2015, ICHMT INT S ADV COMP

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