Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : July 13, 2022 - July 14, 2022
Superheaters are essential components in a coal-fired power plant because they keep the highest tube wall temperature points in the radiant boiler. The pressurized steam flowing in the superheater tubes is heated via the thermal radiation and convection from the combustion gas. To prevent the bursting of superheater tubes caused by the thermal fatigue for stable and safe plant operation, precisely predicting complex heat transfer characteristics, and estimating the local temperature and heat flux of the superheater are necessary. In this study, a computational fluid dynamics model of the boiler and the second and third superheaters in a coal-fired power plant was developed using radiation model (DO model) and turbulence models (k-ε RNG model). In the third superheater, the tube wall temperature and heat flux became large in the upper and middle parts of the superheater, where the combustion gas flow around the superheater was high, whereas those at the bottom of the superheater were significantly small due to the dead water region of the gas.
