動力・エネルギー技術の最前線講演論文集 : シンポジウム
Online ISSN : 2424-2950
セッションID: B124
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石炭火力発電所ボイラにおける二次および三次過熱器の熱流束・温度評価に関する数値シミュレーション
黒瀬 築*梅沢 修一宮田 一司大森 修一
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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.

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