350 MW超灵活锅炉深度调峰下水冷壁流动不稳定性及动态特性分析

卫子钰; 朱天如; 于婷婷; 殷亚宁; 王婷; 杨冬

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350 MW超灵活锅炉深度调峰下水冷壁流动不稳定性及动态特性分析

更新时间：2025-08-21

- 350 MW超灵活锅炉深度调峰下水冷壁流动不稳定性及动态特性分析
- Numerical Analysis of Flow Instability and Dynamic Characteristics in Water Wall of 350 MW Ultra-Flexible Boiler during Deep Peak-Shaving Operation
- 西安交通大学学报 2025年
- 作者机构：
  
  1.西安交通大学动力工程多相流国家重点实验室,陕西省西安市710049
  2.哈尔滨锅炉厂有限责任公司低碳热力发电技术与装备全国重点实验室,黑龙江省哈尔滨市150046
- 作者简介：
- 基金信息：
  
  国家重点研发计划资助项目(2022YFB4100303)
- DOI：
  中图分类号： TK223.3
- 收稿：2025-06-17，
  
  修回：2025-08-02，
  
  录用：2025-08-21，
- 稿件说明：
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卫子钰, 朱天如, 于婷婷, 等. 350 MW超灵活锅炉深度调峰下水冷壁流动不稳定性及动态特性分析[J/OL]. 西安交通大学学报, 2025.

WEI Ziyu, ZHU Tianru, YU Tingting, et al. Numerical Analysis of Flow Instability and Dynamic Characteristics in Water Wall of 350 MW Ultra-Flexible Boiler during Deep Peak-Shaving Operation[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2025.
卫子钰, 朱天如, 于婷婷, 等. 350 MW超灵活锅炉深度调峰下水冷壁流动不稳定性及动态特性分析[J/OL]. 西安交通大学学报, 2025. DOI：

WEI Ziyu, ZHU Tianru, YU Tingting, et al. Numerical Analysis of Flow Instability and Dynamic Characteristics in Water Wall of 350 MW Ultra-Flexible Boiler during Deep Peak-Shaving Operation[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2025. DOI：

摘要

针对工质参数快速变化在超灵活锅炉深度调峰过程中引起的典型流体动力不稳定现象，提出了一种深入探究超灵活锅炉的密度波不稳定性机理及水冷壁动态响应特性的预测模型。基于频域法，将整个蒸发管段划分为过冷区、两相区和过热区3部分，对守恒方程进行线性化和微小扰动处理，利用拉普拉斯变换求解获得管道段的传递函数，基于此开发C语言和MATLAB的一维线性三区段临界热负荷（CHF）预测程序，并采用奈奎斯特稳定性判据评估系统的稳定性。以350 MW超灵活塔式超临界煤粉锅炉为研究对象，结果表明：75%和30%额定负荷的CHF分别为194.9 kW·m

-2

和26.38 kW·m

-2

，实际工况点距离热负荷边界有足够的安全裕度；当锅炉在两负荷之间运行时，提高运行压力和热负荷可增强流动稳定性，增加管段长度和降低管道倾角会降低流动稳定性；入口焓越大，系统恢复稳定所需的时间越短。研究成果可为锅炉深度调峰安全运行奠定理论基础。

Abstract

To address the typical hydrodynamic instability phenomena induced by periodic fluctuations in working fluid pressure

flow rate

and temperature during deep peak-shaving operation of ultra-flexible boilers

a predictive model is proposed to investigate the density wave oscillation mechanisms and dynamic response characteristics of water-cooled walls in-depth. Using the frequency-domain method

the evaporator tube section is divided into subcooled

two-phase

and superheated regions. The conservation equations are linearized with small perturbations

and Laplace transform is applied to obtain the pipe section's transfer function. Based on this

a one-dimensional linear three-region Critical Heat Flux (CHF) prediction program was developed in C and Matlab

with system stability evaluated using the Nyquist stability criterion. For a 350 MW ultra-flexible tower-type supercritical coal-fired boiler

analysis shows CHF values of 194.9 kW·m⁻² at 75% rated load and 26.38 kW·m⁻² at 30% rated load

with actual operating conditions maintaining sufficient safety margins from thermal load boundaries. When operating between these loads

increasing operating pressure and thermal load enhances flow stability

while longer tube lengths and reduced pipe inclination angles decrease stability. Higher inlet enthalpy shortens system stabilization time. These findings provide theoretical support for safe boiler operation during deep peak-shaving.

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