Abstract The spatial distribution of solid particles is a key factor affecting the performance of fluidized bed reactors. Non-invasive techniques including radioactive particle tracking (RPT) and positron emission particle tracking (PEPT) are deployed to measure the solids distribution. Different methods to calibrate the particle tracking measurements have been developed to quantify mean solids concentration. In this paper, gas-solid flows in a traveling fluidized bed are simulated with CFD-DEM and the behavior of different particles, including bulk sand particles and tracer particles are investigated. The simulated hydrodynamics are compared with experimental measurements. Analyses are carried out to derive the mean solids concentration from the tracer particle data. Different calibration approaches are examined, and the simple calibration method is verified. It is shown that the mean solids concentration can be measured reliably using representative tracer particles. The experimental RPT data are then revisited with the new calibration method which yields more realistic results.

中文翻译：

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使用示踪粒子测量流化床中固体分布的简单程序的开发和确认

摘要 固体颗粒的空间分布是影响流化床反应器性能的关键因素。包括放射性粒子追踪 (RPT) 和正电子发射粒子追踪 (PEPT) 在内的非侵入性技术被用于测量固体分布。已经开发了校准粒子跟踪测量的不同方法来量化平均固体浓度。在本文中，移动流化床中的气固流动用 CFD-DEM 模拟，并研究了不同颗粒的行为，包括散装砂颗粒和示踪颗粒。模拟的流体动力学与实验测量值进行了比较。进行分析以从示踪粒子数据导出平均固体浓度。检查了不同的校准方法，并验证了简单的校准方法。结果表明，使用代表性示踪粒子可以可靠地测量平均固体浓度。然后使用新的校准方法重新审视实验 RPT 数据，从而产生更真实的结果。