Analysis of Flow Instability and Dynamic Characteristics in Water Wall of 350 MW Ultra-Flexible Boiler During Deep Peak-Shaving Operation

WEI Ziyu; ZHU Tianru; YU Tingting; YIN Yaning; WANG Ting; YANG Dong

doi:10.7652/xjtuxb202602009

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Analysis of Flow Instability and Dynamic Characteristics in Water Wall of 350 MW Ultra-Flexible Boiler During Deep Peak-Shaving Operation

Special Topic Frontier Applications of Supercritical Fluids | 更新时间：2026-02-09

- Analysis of Flow Instability and Dynamic Characteristics in Water Wall of 350 MW Ultra-Flexible Boiler During Deep Peak-Shaving Operation
- Journal of Xi'an Jiaotong University Vol. 60, Issue 2, Pages: 92-102(2026)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室，710049，西安
  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，150046，哈尔滨
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202602009
  CLC： TK223.3
- Received：17 June 2025，
  
  Published：10 February 2026
- 稿件说明：
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WEI Ziyu, ZHU Tianru, YU Tingting, et al. Analysis of Flow Instability and Dynamic Characteristics in Water Wall of 350 MW Ultra-Flexible Boiler During Deep Peak-Shaving Operation[J]. Journal of Xi'an Jiaotong University, 2026, 60(2): 92-102.
DOI：

WEI Ziyu, ZHU Tianru, YU Tingting, et al. Analysis of Flow Instability and Dynamic Characteristics in Water Wall of 350 MW Ultra-Flexible Boiler During Deep Peak-Shaving Operation[J]. Journal of Xi'an Jiaotong University, 2026, 60(2): 92-102. DOI： 10.7652/xjtuxb202602009.

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C语言和MATLAB软件，开发一维线性三区段临界热流密度预测程序，并采用奈奎斯特（Nyquist）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：在75%和30%额定负荷下，临界热流密度分别为194.90、26.38 kW/m

，实际工况点距离热流密度边界有足够的安全裕度；当锅炉在两种负荷之间运行时，提高运行压力和热流密度可增强流动稳定性，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。该研究可为锅炉深度调峰安全运行提供理论基础。

Abstract

To address the typical hydrodynamic instability phenomena caused by rapid changes in working fluid parameters during deep peak-shaving operation of ultra-flexible boilers，a predictive model is proposed to deeply investigate the density wave instability mechanism and dynamic response characteristics of water walls. Based on the frequency domain method，the entire evaporator tube section is divided into three parts：subcooled，two-phase，and superheated regions.The conservation equations are linearized and subj ected to small perturbation treatment，and the transfer function of the pipe section is obtained by solving with Laplace transform.Based on this process，a one-dimensional linear three-reg

ion critical heat flux prediction program is developed using C language and MATLAB software，and the Nyquist stability criterion is employed to evaluate system stability.Taking a 350 MW ultra-flexible tower-type supercritical coal-fired boiler as the research object，the results show that at 75% and 30% rated loads，the critical heat flux values are 194.90 kW/m

and 26.38 kW/m

，respectively，with actual operating points maintaining sufficient safety margins from the heat flux boundary. When the boiler operates between these two loads，increasing operating pressure and heat flux enhances flow stability，while increasing tube length and reducing pipe inclination angle reduce flow stability. Higher inlet enthalpy shortens the time required for the system to return to stability.This study provides a theoretical basis for the safe operation of boilers during deep peak-shaving.

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