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

Gao Yibin; Zuo Qi; Zhang Hao; Fan Zunshuo; Li Yong; Xu Jing

doi:10.21656/1000-0887.460177

Volume 47 Issue 8

Aug. 2026

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Article Navigation > Applied Mathematics and Mechanics > 2026 > 47(8): 1035-1044

Gao Yibin, Zuo Qi, Zhang Hao, Fan Zunshuo, Li Yong, Xu Jing. Influencing Factors on the Water-Cooled Wall Thermal Stress in CFB Boilers[J]. Applied Mathematics and Mechanics, 2026, 47(8): 1035-1044. doi: 10.21656/1000-0887.460177

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

doi: 10.21656/1000-0887.460177

Gao Yibin¹,
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

Received Date: 2025-09-24
Rev Recd Date: 2025-12-17

Available Online: 2026-07-30

Publish Date: 2026-08-01

Abstract

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

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References(25)

References

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