Abstract Compared to a pulverized coal boiler, a circulating fluidized bed (CFB) boiler may face greater risk if a sudden power failure accident happens due to the massive bed materials in its main loop. In this study, a numerical simulation is conducted to analyze the heat transfer process of the stationary bed materials and estimate the bed temperature based on a real sudden power failure accident that happened in a 170 t/h CFB boiler. The simulation results are consistent well with the measurement data of three measuring points, which indicates that the simulation results are reliable. The simulation results show that the stationary bed materials continuously dissipate heat but the cooling trends in different areas of the bed materials are different. The average bed temperature is estimated to reach 729.2 °C at the end time of the simulation. It is also found that the thermal conductivity of the bed material is the major influencing factor of the bed temperature and heat dissipation process after a sudden power failure, while the effect of the emissivity of the bed material on the bed temperature is slight.

中文翻译：

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CFB锅炉突然停电后静床物料的传热分析

摘要 与煤粉锅炉相比，循环流化床（CFB）锅炉由于主回路中的大量床料而发生突然停电事故，可能面临更大的风险。在本研究中，基于170 t/h CFB锅炉发生的真实突然停电事故，通过数值模拟分析固定床材料的传热过程并估算床温。仿真结果与三个测点的测量数据吻合良好，表明仿真结果是可靠的。仿真结果表明，固定床料持续散热，但床料不同区域降温趋势不同。在模拟结束时，平均床温估计达到 729.2 °C。