Calculation and Analysis of Flow Instability Characteristics in Water Wall of Supercritical Circulating Fluidized Bed Boiler During Deep Peak Shaving

LI Weiteng; GUO Zerui; HAN Lei; YANG Dong

doi:10.7652/xjtuxb202501007

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Calculation and Analysis of Flow Instability Characteristics in Water Wall of Supercritical Circulating Fluidized Bed Boiler During Deep Peak Shaving

更新时间：2026-01-06

- Calculation and Analysis of Flow Instability Characteristics in Water Wall of Supercritical Circulating Fluidized Bed Boiler During Deep Peak Shaving
- Journal of Xi’an Jiaotong University Vol. 59, Issue 1, Pages: 68-77(2025)
- 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
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202501007
  CLC： TK223.3
- Received：28 February 2024，
  
  Online First：08 October 2024，
  
  Published：10 January 2025
- 稿件说明：
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LI Weiteng, GUO Zerui, HAN Lei, et al. Calculation and Analysis of Flow Instability Characteristics in Water Wall of Supercritical Circulating Fluidized Bed Boiler During Deep Peak Shaving[J]. Journal of Xi’an Jiaotong University, 2025, 59(1): 68-77.
DOI：

LI Weiteng, GUO Zerui, HAN Lei, et al. Calculation and Analysis of Flow Instability Characteristics in Water Wall of Supercritical Circulating Fluidized Bed Boiler During Deep Peak Shaving[J]. Journal of Xi’an Jiaotong University, 2025, 59(1): 68-77. DOI： 10.7652/xjtuxb202501007.

摘要

针对深度调峰时超临界循环流化床锅炉水冷壁管道内的汽液两相流动不稳定问题，提出了一种适用于不同工况的频域法数学模型。通过对质量、能量、动量方程进行小扰动线性化后经拉普拉斯变换得到了用于描述管道内汽液流体流动稳定性的传递函数，通过图解奈奎斯特图的方法判断管内工质流动的稳定性。然后，通过该模型计算了某350 MW超临界循环流化床锅炉水冷壁管段的不稳定边界并研究了不同参数对流动不稳定特性的影响。计算结果表明：所选回路在20%和50%锅炉最大连续蒸发量负荷发生流动不稳定时，热负荷分别为76.09 kW·m

－2

和113.52 kW·m

－2

，水冷壁管道流动稳定且安全；入口过冷度对临界热流密度的影响呈非单值性；增大质量流速使流体的进口和出口密度差减小，有利于流动的稳定；增大入口节流系数，可以抑制入口处流量的脉动，有利于流动的稳定；在不同的工况条件下，改变管段倾斜角度会对流动稳定性产生不同的影响。

Abstract

A frequency domain mathematical model is proposed to address the instability of gas-liquid two-phase flow in water-cooled wall pipelines of supercritical circulating fluidized bed boilers during deep peak shaving

suitable for various operating conditions. The transfer function characterizing the stability of gas-liquid flow within the tubes is derived by linearizing the mass

energy

and momentum equations with small disturbances and applying Laplace transform. The stability of the working fluid flow in the tubes is assessed using Nyquist diagram interpretation. Using this model

the instability boundary of the water wall tube segment of a 350 MW supercritical circulating fluidized bed boiler is calculated

and the impact of different parameters on the flow instability characteristics is investigated. The results show that the heat loads at which flow instability occurs during 20% and 50% of the boiler's maximum continuous evaporation rate are 76.09 kW·m

－2

and 113.52 kW·m

－2

respectively

indicating the stability and safety of the water wall tube flow. The effect of inlet subcooling on critical heat flux density exhibits a non-monotonic relationship. Increasing the mass flow rate reduces the density difference between the inlet and outlet fluids

promoting flow stability. Moreover

raising the inlet throttling coefficient can dampen flo

w pulsations at the inlet

further enhancing flow stability. Altering the tilt angle of the tube section under different operational conditions leads to varying effects on flow stability.

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