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光导纤维测定 FCC 湍动流化床中的气泡特性 被引量:3
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作者 张小平 钱宇 +1 位作者 郭祀远 张蕴璧 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 1997年第8期21-25,共5页
在一内径190mm,高5500mm流化床实验装置内,以FCC催化剂为流化介质,空气为流化气体,采用直射式光导纤维探头于湍流流化区,测定了床中气泡的大小、上升速度及分率等参数,并对实验结果进行了关联。
关键词 湍流流态化 气泡参数 直射式光导纤维
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Solid concentration and velocity distributions in an annulus turbulent fluidized bed
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作者 吴诚 高用祥 +2 位作者 成有为 王丽军 李希 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第7期1077-1084,共8页
Solid concentration and particle velocity distributions in the transition section of a Ф 200 mm turbulent fluidized bed (TFB) and a q5200 mrn annulus turbulent fluidized bed (A-TFB) with a Ф 50 mm central standp... Solid concentration and particle velocity distributions in the transition section of a Ф 200 mm turbulent fluidized bed (TFB) and a q5200 mrn annulus turbulent fluidized bed (A-TFB) with a Ф 50 mm central standpipe were measured using a PVBD optical probe. It is concluded that in turbulent regime, the axial distribution of solid concentration in A-TFB was similar to that in TFB, but the former had a shorter transition section. The axial solid concentration distribution, probability density, and power spectral distributions revealed that the standpipe hin- dered the turbulence of gas-solid two-phase flow at a low superficial gas velocity. Consequently, the bottom flow of A-TFB approached the bubbling fluidization pattern. By contrast, the standpipe facilitated the turbulence at a high superficial gas velocity, thus making the bottom flow of A-TFB approach the fast fluidization pattern. Both the particle velocity and solid concentration distribution presented a unimodal distribution in A-TFB and TFB. However, the standpipe at a high gas velocity and in the transition or dilute phase section significantly affected the radial distribution of flow parameters, presenting a bimodal distribution with particle concentration higher near the internal and external walls and in downward flow. Conversely, particle concentration in the middle an- nulus area was lower, and particles flowed upward. This result indicated that the standpipe destroyed the coreannular structure of TFB in the transition and dilute phase sections at a high gas velocity and also improved the particle distribution of TFB. In conclusion, the standpipe improved the fluidization quality and flow homogeneity at high gas velocity and in the transition or dilute phase section, but caused opposite phenomena at low gas velocity and in the dense-phase section. 展开更多
关键词 FluidizationAnnulus bedTransition sectionHydrodynamicsTurbulence
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