Abstract Computational fluid dynamics (CFD) model of coal combustion is coupled with the one-dimensional hydrodynamic model of supercritical steam, and applied in the simulation of the superheater. The convective heat exchangers are neglected. Complex tube arrangements can be modeled with the aid of AutoCAD, and therefore the simulation could offer detailed information on heat exchangers. It is found that the outlet steam temperature of the tube is very sensitive to the variation of ash deposit temperature. Therefore it is not reasonable to use decoupled method for predicting the energy flux transported to the steam. The outlet steam temperature of a row of tubes is compared with the running data from the power plant. The simulation result fits well with running data. Nevertheless, one can impose an average steam temperature plus 50 K as the tube outside surface temperature; then calculates the temperature of the ash deposit according to the thermal resistance of ash deposit and energy flux. The result from this “simplified” coupled method is very close to fully coupled method.

中文翻译：

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燃煤超临界锅炉燃烧与流体动力学耦合建模

摘要 煤燃烧计算流体动力学（CFD）模型与超临界蒸汽一维流体动力学模型耦合，应用于过热器的模拟。对流换热器被忽略。复杂的管道布置可以在 AutoCAD 的帮助下进行建模，因此模拟可以提供有关换热器的详细信息。发现管的出口蒸汽温度对灰沉积温度的变化非常敏感。因此，使用解耦方法预测输送到蒸汽的能量通量是不合理的。将一排管子的出口蒸汽温度与发电厂的运行数据进行比较。仿真结果与运行数据吻合较好。尽管如此，可以将平均蒸汽温度加上 50 K 作为管外表面温度；然后根据灰层的热阻和能量通量计算灰层的温度。这种“简化”耦合方法的结果非常接近于完全耦合方法。