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Intrusive probes in riser applications
AIChE Journal ( IF 3.7 ) Pub Date : 2017-08-12 18:41:00 , DOI: 10.1002/aic.15892
Ray A. Cocco 1 , S.B. Reddy Karri 1 , Ted M. Knowlton 1 , John Findlay 1 , Thierry Gauthier 2 , Jia Wei Chew 3, 4 , Christine M. Hrenya 5
Affiliation  

Many of the probes used to understand hydrodynamics in circulating fluidized bed risers intrude into the environment they are measuring, although assumptions are typically asserted that the intrusive probes do not affect the data collected. This could be a poor assumption in some cases and conditions. We found that intrusive fiber-optic probe measurements consistently mis-predicted the solids concentration compared to the nonintrusive pressure drop measurements outside the fully developed flow region of a riser containing fluid catalytic cracking catalyst or glass bead particles. The discrepancy was sensitive to superficial gas velocity, solid circulation rate, probe position, and flow direction. Barracuda VR™ computational fluid dynamics simulations confirmed this, and indicated that particle momentum was lost at the leading edge of the probe and particles were spilling over to the probe tip. Accordingly, new probe designs were proposed to mitigate the intrusiveness of a fiber-optic probe for more accurate characterization. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译:

冒口应用中的侵入式探头

用于理解循环流化床立管中流体动力学的许多探头都侵入了它们正在测量的环境中,尽管通常会假设侵入式探头不会影响所收集的数据。在某些情况和条件下,这可能是一个错误的假设。我们发现,与包含流体催化裂化催化剂或玻璃微珠颗粒的立管完全展开的流动区域之外的非侵入式压降测量相比,侵入式光纤探针测量始终会错误地预测固体浓度。该差异对表观气体速度,固体循环速率,探头位置和流向敏感。梭子鱼VR™计算流体动力学仿真证实了这一点,并表明粒子动量在探针的前端丢失,并且粒子溢出到探针尖端。因此,提出了新的探针设计以减轻光纤探针的侵入性,以进行更准确的表征。©2017美国化学工程师学会AIChE的Ĵ,2017年
更新日期:2017-08-13
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