当前位置: X-MOL 学术Exp. Therm. Fluid Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Experimental observations on directly irradiated conical spouted and spout-fluid beds
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2021-07-23 , DOI: 10.1016/j.expthermflusci.2021.110488
M. Díaz-Heras 1 , J.F. Belmonte 1 , J.A. Almendros-Ibáñez 1
Affiliation  

This paper presents the experimental results obtained in directly irradiated conical spouted and spout-fluid beds. A conical bed with a minimum and maximum inner diameter of 80 and 314.76 mm was filled with SiC particles and directly irradiated from the top with a beam-down reflector with a 2 kW Xe-lamp. The study examines the influence of the bed height and airflow rate on the temperature distribution over the top surface of the bed (where the concentrated irradiation impinged), measured with an infrared camera. In addition, two type of beds were compared: conventional spouted and spout-fluid beds. The heat exchange of the concentrated radiative flux over the fluidized particles in motion under the action of fountain bursting was assessed by characterizing the temperature of the particles (Probability Density Function, mean value and standard deviation).

The results of this work show that the spouted bed can reduce the maximum temperature of the particles, especially in the case of shallow beds. The behavior in the two cases is different, with the exception of the deep bed, where the spouted bed presents slightly lower homogeneous temperatures than the spout-fluid bed (reducing the appearance of hot spots) and with an associated reduction of 52.28 % in the pumping costs. Spout-fluid temperatures strongly depend on the air velocity and the height of the bed of particles, exhibiting a wider temperature range than the spouted case due to the different fluidization regimes observed.



中文翻译:

直接辐照锥形喷流床和喷流流化床的实验观察

本文介绍了在直接辐照的锥形喷流床和喷流流化床中获得的实验结果。最小和最大内径为 80 和 314.76 mm 的锥形床填充有 SiC 颗粒,并从顶部直接用具有 2 千瓦氙灯。该研究检查了床高度和气流速率对床顶表面(集中辐射照射的地方)的温度分布的影响,用红外摄像机测量。此外,还比较了两种类型的床:常规喷射床和喷射流化床。通过表征粒子的温度(概率密度函数,平均值和标准偏差)来评估在喷泉爆裂作用下运动流化粒子上的集中辐射通量的热交换。

这项工作的结果表明,喷射床可以降低颗粒的最高温度,尤其是在浅床的情况下。两种情况下的行为是不同的,除了深床,其中喷流床的均质温度略低于喷流流化床(减少了热点的出现),并且相关的温度降低了 52.28%。抽水费用。喷嘴流体温度在很大程度上取决于空气速度和颗粒床的高度,由于观察到的不同流化状态,其温度范围比喷射情况更宽。

更新日期:2021-07-30
down
wechat
bug