High-temperature and high-pressure conditions have great effects on the heat transfer characteristics of the immersed horizontal tube and understanding them will provide an industrial reference for the arrangement and optimization of heat exchanger in the pressurized fluidized bed furnace. In this study, the pressurized fluidized bed apparatus was developed to investigate the effects of factors such as pressure, temperature, particle size and gas velocity on the local and average heat transfer coefficients of the immersed horizontal tube. The experimental results showed the improved heat transfer at elevated pressure and high temperature. When the bed temperature increased from 400 °C to 800 °C, the proportion of the radiative heat transfer increased significantly, but it did not exceed 15%. The maximum heat transfer coefficients in the process of increasing the fluidization number were also measured in this study and fit well with the prediction results of the Shah model. The distribution of circumferential local heat transfer coefficients showed differences at low fluidization numbers and high fluidization numbers. The model proposed for the immersed horizontal tubes in the pressurized fluidized bed predicted the experimental data points from this study and other different sources well with the absolute average deviation of 11.86%.

高温高压条件对沉管的传热特性有很大的影响，了解它们将为加压流化床炉中换热器的布置和优化提供工业参考。在这项研究中，开发了一种加压流化床设备，以研究压力，温度，粒度和气体流速等因素对水平管的局部和平均传热系数的影响。实验结果表明，在高温高压下，传热性能得到了改善。当床温从400°C升高到800°C时，辐射传热的比例显着增加，但不超过15％。在这项研究中还测量了增加流化数过程中的最大传热系数，并与Shah模型的预测结果非常吻合。周向局部传热系数的分布在低流化数和高流化数下表现出差异。提出的将水平管浸入加压流化床中的模型很好地预测了本研究和其他不同来源的实验数据点，绝对平均偏差为11.86％。