基于气固两相流的双循环流化床提升管压降模型的预测和实验研究

发布时间：2018-10-04 19:28

【摘要】：为研究提升管颗粒循环流率对提升管压降的影响,搭建双循环流化床冷态实验系统,采用差压变送器进行提升管轴向区域压降的实验研究。基于提升管不同的颗粒速度计算方法,充分考虑加速区和充分发展区的不同压降机理,建立加速区、充分发展区和整个提升管压降模型,与实验结果比较发现:加速区颗粒速度采用滑移系数方法所得压降与实验值较吻合,在充分发展区进行压降计算时颗粒速度采用滑移速度等于终端速度计算所得结果较精确;在提升管压降计算时可综合考虑加速区和充分发展区适用的压降模型进行计算,可为实际生产运行中采用压差法进行提升管轴向颗粒浓度的分布提供一定参考,为提升管压降的在线监测提供指导。
[Abstract]:In order to study the effect of the particle circulation flow rate on the pressure drop of the riser, a cold experimental system of double circulating fluidized bed was built, and the differential pressure transmitter was used to study the axial pressure drop of the riser. Based on the different particle velocity calculation methods of the riser and considering the different pressure drop mechanism of the acceleration zone and the full development zone, the pressure drop model of the acceleration zone, the full development zone and the whole riser is established. Compared with the experimental results, it is found that the pressure drop obtained by the slip coefficient method in the acceleration zone is in good agreement with the experimental value, and that the calculation results of the particle velocity with the slip velocity equal to the terminal velocity are more accurate when the pressure drop is calculated in the fully developed region. In the calculation of the pressure drop of the riser, the suitable pressure drop model of the acceleration zone and the fully developed zone can be considered synthetically, which can provide a certain reference for the distribution of axial particle concentration of the riser pipe by using the pressure difference method in the actual production and operation. Provide guidance for on-line monitoring of pressure drop of riser.
【作者单位】：华北电力大学电站设备状态监测与控制教育部重点实验室;河北水利电力学院;
【基金】：河北省青年基金项目(QN2016204)~~
【分类号】：TQ051.13

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