Measurements of Solid Velocity in a Pilot-Scale Geldart’s Group B Circulating Fluidized Bed Using a Radioactive Particle Tracking Technique,Industrial & Engineering Chemistry Research

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Measurements of Solid Velocity in a Pilot-Scale Geldart’s Group B Circulating Fluidized Bed Using a Radioactive Particle Tracking Technique
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-17 , DOI: 10.1021/acs.iecr.2c01119
Trilokpati Tribedi ₁ , Premsagar Pillajetti ₁ , Roushni Kumari ₁ , Harish Jagat Pant ₂ , Pankaj Tiwari ₁ , Rajesh Kumar Upadhyay ₃

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Circulating fluidized bed (CFB) is used for a wide range of gas–solid reactions. However, most of the data reported on CFBs are for Geldart’s group A particles, although the applications of Geldart’s group B CFBs are numerous. In the current work, the solid flow field is deciphered in a pilot-plant-scale Geldart’s group B CFB riser. Solid motion is tracked by using a radioactive particle tracking technique. The data are reported in a fully developed flow region of 0.1 m diameter and 6.5 m height CFB riser at different inlet gas velocities (7.6–9.2 m/s) and solid fluxes (100–200 kg/m² s). The different flow quantities such as mean axial and radial velocities, root-mean-square velocities, granular temperature, and turbulent intensities are calculated for all the cases. It is observed that solid motion predominantly lies in the axial direction. The probability distribution function of instantaneous solid velocity shows wider distribution near the wall as compared to the center of the riser. This shows that the probability of mesoscale metastable structure formation increases while moving from the center to the wall. Furthermore, the results show that the mean solid velocity largely depends on gas–solid interactions. However, for the fluctuating velocity, both gas–solid and solid–solid interactions are critical. The results indicate that the solid turbulent intensity in Geldart’s group B riser is significantly higher than that in the group A riser. Hence, solid velocity fluctuations are higher in the group B riser.

中文翻译：

使用放射性粒子追踪技术测量中试规模的 Geldart 的 B 组循环流化床中的固体速度

循环流化床 (CFB) 用于广泛的气固反应。然而，尽管 Geldart 的 B 组 CFB 的应用很多，但大部分关于 CFB 的报告数据都是针对 Geldart 的 A 组粒子的。在目前的工作中，固体流场在中试工厂规模的 Geldart 的 B 组 CFB 立管中被破译。通过使用放射性粒子跟踪技术来跟踪固体运动。数据报告在直径为 0.1 m、高度为 6.5 m 的 CFB 立管的完全发达的流动区域中，在不同的入口气体速度（7.6-9.2 m/s）和固体通量（100-200 kg/m ²s)。计算所有情况下的不同流量，例如平均轴向和径向速度、均方根速度、颗粒温度和湍流强度。据观察，固体运动主要位于轴向。瞬时固体速度的概率分布函数表明，与立管中心相比，壁面附近分布更广。这表明中尺度亚稳态结构形成的概率随着从中心向壁面移动而增加。此外，结果表明平均固体速度很大程度上取决于气固相互作用。然而，对于波动的速度，气固和固固相互作用都是至关重要的。结果表明，Geldart B组立管的固体湍流强度明显高于A组立管。因此，B 组立管中的固体速度波动较高。

更新日期：2022-06-17

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