Numerical simulation of transient heat transfer characteristics and thermal stress distribution of molten salt-steam superheater in coal-fired units

DONG Xinyu; YUE Peng; LI Yifei; LIU Lu; WANG Teng; WANG Tai

doi:10.11949/0438-1157.20260345

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Numerical simulation of transient heat transfer characteristics and thermal stress distribution of molten salt-steam superheater in coal-fired units

更新时间：2026-07-07

- Numerical simulation of transient heat transfer characteristics and thermal stress distribution of molten salt-steam superheater in coal-fired units
- CIESC Journal (2026)
- 作者机构：
  
  1.华北电力大学河北省储能技术与能源综合利用重点实验室，河北保定 071003
  2.华北电力大学燕赵电力实验室，河北保定 071003
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260345
  CLC： TK223
- Received：21 March 2026，
  
  Revised：2026-07-05，
  
  Accepted：07 July 2026，
- 稿件说明：
移动端阅览
DONG Xinyu, YUE Peng, LI Yifei, et al. Numerical simulation of transient heat transfer characteristics and thermal stress distribution of molten salt-steam superheater in coal-fired units[J/OL]. CIESC Journal, 2026.
DOI：

DONG Xinyu, YUE Peng, LI Yifei, et al. Numerical simulation of transient heat transfer characteristics and thermal stress distribution of molten salt-steam superheater in coal-fired units[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260345.

摘要

双碳目标下，熔盐储热是提升燃煤机组深度调峰灵活性的关键技术。然而，作为储热系统的核心释能设备，熔盐-蒸汽过热器在快速变负荷工况下的瞬态传热与热冲击机理尚不明确，制约了机组的安全长效运行。本文基于数值模拟方法，系统研究了深度调峰工况下过热器的瞬态传热特性、流动特性与热应力分布规律。结果表明：换热器两侧流动存在显著的弱耦合效应，双侧同步变负荷时压降呈指数型增长，且阻力系数对单侧变工况呈现差异化响应。传热方面，相较于单侧变负荷，双侧同步调节可使出口温度波动幅度降低约20%，实现热流密度的平稳爬升，有效规避初期强热冲击；总传热系数则呈现前期近似指数、后期转为线性的阶段性增长特征。此外，系统热应力波幅与调峰速率呈对数增长趋势，最终应力水平由流速决定，而瞬态演化受流速变化率主导；结构最大形变介于0~0.4 mm之间，变形峰值集中于变工况10~20 s区间。本研究揭示了过热器在瞬态工况下的热-力动态协同演化机制，为该换热器安全、高效运行提供理论依据。

Abstract

Under the dual-carbon goals

molten salt heat storage is a critical technology for enhancing the deep peak-shaving flexibility of coal-fired power plants. However

as the core energy-release equipment of the storage system

the transient heat tran ear

which restricts the safe and long-term operation of the units. Based on numerical simulation methods

this paper systematically investigates the transient heat transfer characteristics

flow characteristics

and thermal stress distribution of the superheater under deep peak-shaving conditions. The results indicate a significant weak coupling effect between the flows on both sides of the heat exchanger. Under synchronous bilateral load variations

the pressure drop exhibits exponential growth

and the resistance coefficient shows a differentiated response to unilateral load variations. Regarding heat transfer

compared to unilateral load variations

synchronous bilateral regulation can reduce the outlet temperature fluctuation amplitude by approximately 20% and achieve a steady climb in heat flux

thereby effectively circumventing severe initial thermal shocks. The overall heat transfer coefficient demonstrates a phased growth pattern characterized by an initial near-exponential increase followed by a transition to linear growth. Furthermore

the amplitude of the system's thermal stress exhibits a logarithmic growth trend with the peak-shaving rate. The ultimate stress level is determined by the flow velocity

whereas the transient evolution is dominated by the flow velocity variation rate. The maximum structural deformation ranges from 0 to 0.4 mm

with the deformation peak concentrated within the 10–20s interval of the load variation process. This study reveals the dynamic thermo-mechanical synergistic evolution mechanisms of the superheater under transient conditions

providing a theoretical basis for the safe and efficient operation of this heat exchanger.

关键词

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references

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