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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Optimization of Life Time Expectance for Heat Exchangers with Special Requirements

Pascal Freko
Linde AG - Engineering Division, Dr.-Carl-von-Linde-Str. 6-14, 82049 Pullach, Germany

Ingo Thomas
Linde AG - Engineering Division, Dr.-Carl-von-Linde-Str. 6-14, 82049 Pullach, Germany

Reinhold Hoelzl
Linde AG, Engineering Division

Axel Lehmacher
Linde AG, Engineering Division

Alexander Woitalka
Linde AG - Engineering Division, Dr.-Carl-von-Linde-Str. 6-14, 82049 Pullach, Germany

DOI: 10.1615/IHTC15.hex.009791
pages 3715-3725


SCHLÜSSELWÖRTER: Numerical simulation and super-computing, Heat exchanger, Life time estimation

Abstrakt

Heat exchangers of different types have a variety of expectances of lifetime and lifetime is governed by fatigue effects. Fatigue may occur for steel components like straight tube heat exchangers (STHE) as well as for aluminium components like aluminium brazed plate fin heat exchangers (PFHE), if the combination of stress amplitudes and frequency is high enough. Linde’s aim is to improve heat exchanger design, process conditions and operational procedures to optimize lifetime expectance and thus ensure high plant availability. For detailed analysis, start-up and offset scenar- ios are defined with all impact on heat exchangers (input conditions, frequency of scenarios, etc.). Linde has elaborated tools and procedures to investigate both stationary and unsteady conditions. If required, rigorous dynamic process simulations for heat exchangers with user-defined or pre-defined local and transient heat transfer and pressure drop correlations, including relevant unit operations (e.g. expanders, valves, separators, splits, etc.) can be performed within Linde’s in-house process simulation environment OPTISIMR ?. The re- sulting profiles for temperatures and heat transfer coefficients are input for succeeding FEM analysis, which is the structural mechanic basis for lifetime estimation. Subsequently, heat exchanger design may be optimized and further-on operation procedures and process conditions may be improved. Furthermore, also the accumu- lated lifetime consumption for existing equipment already years in operation can be examined, if sufficient information is available. Thus unplanned shut-downs can be avoided as heat exchangers with low remaining lifetime expectance can be replaced in time

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