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UID:pretalx-amfc2026-QHLCKE@modelica.simtek.cc
DTSTART;TZID=CST:20260922T144000
DTEND;TZID=CST:20260922T150500
DESCRIPTION:Under low-load conditions\, the water wall of ultrasupercritica
 l boilers often faces severe challenges such as flow distribution imbalanc
 e\, phase change point migration\, and hydrodynamic multiplicity\, which c
 an easily induce tube wall overheating and even tube rupture\, directly th
 reatening the safety of heating surfaces. To address this\, this paper con
 structs a thermalhydraulic-stress multi-physics coupled simulation model f
 or a 1000 MW ultra-supercritical boiler water wall using the Modelica lang
 uage. It analyzed three typical operating conditions\, BMCR\, 75% THA\, an
 d 50% THA\, to investigate the coupled distribution of hydrodynamic charac
 teristics and stress-strain. The results show that mechanical stress decre
 ases linearly with load reduction\, thermal stress peaks due to enhanced p
 hase-change heat transfer\, and strain distribution is dominated by therma
 l expansion. The equivalent stress is controlled by mechanical stress\, ex
 hibiting a trend of first decreasing and then increasing with height. The 
 conclusions indicate that the essential causes of increased local failure 
 risk are the coupling effect of flow distribution imbalance and non-unifor
 m heat load under low load. This study provides a theoretical basis for op
 timization design.
DTSTAMP:20261004T070644Z
LOCATION:Energy (R2002)
SUMMARY:Modelica-Based Simulation of Hydrodynamics and Thermomechanical Str
 ess in Water-Wall Tubes of a 1000 MW Ultra-Supercritical Boiler - Tianyu C
 hu\, Can Fang\, Jiali Huang\, Wei Zhang\, Junhua Chen\, Dong Guo\, Yi Lu
URL:https://modelica.simtek.cc/amfc2026/talk/QHLCKE/
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