CFD analysis of temperature imbalance in superheater/reheater region of tangentially coal-fired boiler

4th International Conference on Mechanical Engineering Research

Zainudin, A.F.^1 ; Hasini, H.^1 ; Fadhil, S.S.A.^1

Fluid Dynamics and Risk Reduction Research Group, Institute of Sustainable Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang, Selangor

43000, Malaysia^1

关键词: CFD analysis;    Cross sectional area;    Flue gas temperatures;    Gain insight;    Imbalance problem;    Steam temperature;    Tube leaks;    Velocity deviation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/257/1/012062/pdf
DOI  :  10.1088/1757-899X/257/1/012062

来源: IOP

【 摘 要 】

This paper presents a CFD analysis of the flow, velocity and temperature distribution in a 700 MW tangentially coal-fired boiler operating in Malaysia. The main objective of the analysis is to gain insights on the occurrences in the boiler so as to understand the inherent steam temperature imbalance problem. The results show that the root cause of the problem comes from the residual swirl in the horizontal pass. The deflection of the residual swirl due to the sudden reduction and expansion of the flow cross-sectional area causes velocity deviation between the left and right side of the boiler. This consequently results in flue gas temperature imbalance which has often caused tube leaks in the superheater/reheater region. Therefore, eliminating the residual swirl or restraining it from being diverted might help to alleviate the problem.