循环流化床锅炉水冷壁热应力影响因素分析

高义斌; 左琪; 张浩; 樊尊硕; 李勇; 徐婧

doi:10.21656/1000-0887.460177

循环流化床锅炉水冷壁热应力影响因素分析

doi: 10.21656/1000-0887.460177

高义斌^1,,
左琪¹,
张浩¹,
樊尊硕²,
李勇²,
徐婧^2, ,

1.
国网山西省电力有限公司电力科学研究院，太原 030001
2.
太原理工大学电气与动力工程学院，太原 030024

基金项目:

国网山西省电力公司科技项目 520530250004

详细信息

作者简介:
高义斌(1979—)，男，正高级工程师，硕士(E-mail: gaoyibin2004@126.com)

通讯作者:
徐婧(1989—)，女，副教授，博士(通信作者. E-mail: xujing@tyut.edu.cn)

中图分类号: O351
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- 被引次数: 0
出版历程
- 收稿日期: 2025-09-24
- 修回日期: 2025-12-17
- 刊出日期: 2026-08-01

Influencing Factors on the Water-Cooled Wall Thermal Stress in CFB Boilers

Gao Yibin^1
,,
Zuo Qi¹,
Zhang Hao¹,
Fan Zunshuo²,
Li Yong²,
Xu Jing^{2
, ,}

1.
State Grid Shanxi Electric Power Company Electric Power Research Institute Taiyuan, Taiyuan 030001, P.R. China
2.
College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China

摘要

摘要: 本文以某在役超临界循环流化床(circulating fluidized bed, CFB)锅炉为研究对象，结合实际运行数据，构建其温度场与应力场的仿真模型，探讨了管壁外热流密度、对流传热系数等边界条件对水冷壁管最高温度与最大热应力的影响规律，分析了鳍片厚度、管间节距等结构参数对相邻水冷壁管最大温差与最大热应力的影响.仿真结果表明：当对流换热系数一定时，水冷壁管的最高壁温与最大热应力随着管外壁热流密度的增大而增大；当管外壁热流密度一定时，水冷壁管的最高温度与最大热应力随着管壁与工质间对流换热系数的增大而减小；当换热系数降低至0.5 kW/(m²·K) 时，最大热应力迅速增大，相邻水冷壁管的最大温差及最大热应力会随着鳍片厚度的减小而增大，但会随着管间节距的增大而增大.当鳍片厚度减少2 mm时，相邻水冷壁管的最大温差可升高约5 ℃，对应的最大热应力由213 MPa升高至219 MPa；当管间节距增加2 mm时，相邻水冷壁管的最大温差可升高7 ℃，对应的最大热应力由213.8 MPa升高至215.1 MPa
- 循环流化床锅炉 /
- 水冷壁 /
- 数值模拟 /
- 壁温 /
- 热应力
Abstract: The in-service supercritical circulating fluidized bed boiler was investigated. Based on actual operational data, a numerical simulation model for the temperature field and the stress field was established. The effects of boundary conditions, including the external heat flux density of the tube wall and the convective heat transfer coefficient, on the maximum wall temperature and maximum thermal stress of the water-wall tube, were discussed. In addition, the influences of structural parameters, such as the fin thickness and the tube pitch, on the maximum temperature difference and maximum thermal stress between adjacent water-wall tubes, were analyzed. The simulation results indicate that, under a constant convective heat transfer coefficient, both the maximum wall temperature and the maximum thermal stress of the water-wall tube will increase with the external heat flux density. Conversely, when the external heat flux density is kept constant, the maximum wall temperature and maximum thermal stress will decrease as the convective heat transfer coefficient between the tube wall and the working medium increases. Notably, when the convective heat transfer coefficient decreases to 0.5 kW/((m²·K), the maximum thermal stress will increase sharply. Furthermore, the maximum temperature difference and maximum thermal stress between adjacent water-wall tubes will increase with the decrease of the fin thickness, but increase with the tube pitch. Specifically, when the fin thickness is reduced by 2 mm, the maximum temperature difference between adjacent water-wall tubes will increase by approximately 5℃, accompanied by an increase in the maximum thermal stress from 213 MPa to 219 MPa. When the tube pitch increases by 2 mm, the maximum temperature difference will rise by about 7 ℃, and the corresponding maximum thermal stress will rise from 213.8 MPa to 215.1 MPa.
- circulating fluidized bed boiler /
- water-cooled wall /
- numerical simulation /
- wall temperature /
- thermal stress
other
(Contributed by Li Yong, Member of the Youth Editorial Board of AMM)
注释:

1) (本刊青年编委李勇来稿)

HTML全文

图 1 炉膛上部膜式水冷壁管尺寸参数

Figure 1. Dimensional parameters of membrane water-cooled wall tubes in the upper part of the furnace chamber

下载: 全尺寸图片幻灯片

图 2 水冷壁结构及其网格划分

Figure 2. The water-cooled wall structure and it's meshing

下载: 全尺寸图片幻灯片

图 3 网格无关性验证

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 3. The mesh independence verification

下载: 全尺寸图片幻灯片

图 4 变负荷过程中水冷壁管壁温变化曲线

Figure 4. Water-cooled wall outlet temperature change curves during the load variation process

下载: 全尺寸图片幻灯片

图 5 不同对流换热系数下水冷壁管最高温度随热流密度变化曲线

Figure 5. The maximum temperatures of the water-cooled wall tube varying with the heat flow density under different convective heat transfer coefficients

下载: 全尺寸图片幻灯片

图 6 不同对流换热系数下水冷壁管最大热应力随热流密度变化曲线

Figure 6. The maximum thermal stresses of the water-cooled wall tube varying with the heat flow density under different convective heat transfer coefficients

下载: 全尺寸图片幻灯片

图 7 水冷壁管最大热应力及最大温差随鳍片厚度变化曲线

Figure 7. The maximum thermal stress and temperature difference of the water-cooled wall tube varying with the fin thickness

下载: 全尺寸图片幻灯片

图 8 水冷壁管最大热应力及最大温差随节距变化曲线

Figure 8. The maximum thermal stress and temperature difference varying with the pitch of the water-cooled wall tubes

下载: 全尺寸图片幻灯片

表 1 案例CFB锅炉主要参数

Table 1. Operating parameters of the case CFB boiler

parameter	unit	BMCR	BRL
main steam flow	t/h	1 230.0	1 171.3
main steam pressure	MPa	25.31	25.31
main steam temperature	℃	571	571
reheat steam flow	t/h	990.215	943.057
reheat steam pressure	MPa	5.411	5.144
reheater outlet steam temperature	℃	569	569
feed water temperature	℃	297	293

下载: 导出CSV

表 2 12Cr1MoVG的性能参数^[15]

Table 2. 12Cr1MoVG performance parameters^[15]

temperature/℃	200	300	400	500
elasticity modulus/GPa	201	192	181	165
linear expansion coefficient/(10^-6/K)	13.7	14.0	14.2	14.5
thermal conductivity/(W/(m·K))	42.70	40.56	38.89	36.11
specific heat capacity/(J/(kg·K))	-	607	657	712
Poisson’s ratio	0.300	0.319	0.298	0.301
yield strength/MPa	-	-	228	201

下载: 导出CSV

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