Coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation

• Published in: International journal of thermal sciences 2022-07, Vol.177, p.107557, Article 107557
• Main Authors: Yuan, Maobo, Liu, Hu, Wu, Ying, Liang, Yong, Deng, Lei, Belošević, Srdjan, Tomanović, Ivan, Che, Defu
• Format: Article
• Language: English
• Subjects: Coordinate transformation; Heat reallocation; Metal temperature; Spiral water-cooled wall; Wide operating load
• ISSN: 1290-0729; 1778-4166
• DOI: 10.1016/j.ijthermalsci.2022.107557

Fireside metal temperature is quite important in the safety evaluation of boiler water-cooled wall. While little literature reported the accurate temperature calculation model for spiral water-cooled wall. This paper proposes a coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation. A computational fluid dynamics (CFD) model based on a 600 MW tangentially coal-fired boiler is used to provide the original heat flux distributions under various boiler loads. The reallocated heat distribution directly maps with the flow path of the spiral water-cooled wall. The combination of the heat reallocation model and thermal-hydraulic model is realized in MATLAB platform. The calculated temperature distributions at the outlet of the spiral water-cooled wall agree well with the in-situ data, and the maximum relative errors under 100% BMCR load and 75% THA load are 2.7% and 3.2%, respectively. The numerical results show that the working fluid flow rates of the divided loops are almost equal and the maximum metal temperatures of the spiral water-cooled wall are 732.1 K, 710.4 K, 760.9 K and 792.9 K under 100% BMCR, 75% THA, 50% THA and 35% BMCR loads, respectively. The local overheating is likely to occur in low boiler load. This model is intended to improve the metal temperature calculation method of the spiral water-cooled wall, which could benefit the safety monitoring of the boiler under variable loads. •Heat reallocation for spiral water wall was conducted by coordinate transformation.•The reallocated heat distribution mapped with the flow path of the spiral water wall.•Coupled modeling of combustion and hydrodynamics was used in temperature calculation.•The working fluid flow rates of the spiral water wall loops were almost equal.•The local overheating of spiral water wall was likely to occur in low boiler load.