Single bubble behavior in gas-liquid-solid mini-fluidized beds

被引:31
作者
Li, Yanjun [1 ]
Liu, Mingyan [1 ,2 ]
Li, Xiangnan [1 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
[2] Tianjin Univ, State Key Lab Chem Engn, Tianjin 300072, Peoples R China
基金
中国国家自然科学基金;
关键词
Gas-liquid-solid fluidization; Mini-fluidized bed; Bubble; Wall effect; Pressure drop; DROPLET FORMATION; MASS-TRANSFER; WASTE-WATER; T-JUNCTION; SLUG FLOW; CHANNEL; SIZE; CFD; HYDRODYNAMICS; SIMULATIONS;
D O I
10.1016/j.cej.2015.10.071
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Gas-liquid-solid mini-fluidized bed is a new and important reactor. However, the flow behavior in such a system is not well understood, even for the characteristics of single bubble. Initial fluidization, movement and size of singe bubble in three-phase co-current upward mini-fluidized beds of 2-10 mm sizes were studied with visual experiments. The results show that the variation of pressure drop across the bed with time is a strong fluctuation due to the coalescence of bubbles at lower superficial liquid velocities for smaller beds, while no obvious difference in the minimum fluidization velocity between the liquid-solid and gas-liquid-solid systems for a 10 mm MFB exists in the experimental ranges. The wall effect on the bubble size is dominant. The stronger wall effect decreases suspension inertial force, which leads to the diminution of bubble size. A force balance between the surface tension force and buoyant force dominates the bubble size in mini-bubble column at lower orifice gas velocities, while suspension inertial force plays more important role in governing the bubble size in three-phase mini-fluidized beds. Additionally, compressibility of the gas phase contributes to the variation in the bubble size; the bubble wake is observed even for such small solid particles, and can affect the following bubble size in smaller beds at relative high orifice gas velocities. An empirical equation was suggested to predict the bubble diameters in three-phase mini-fluidized beds. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:497 / 507
页数:11
相关论文
共 65 条
[41]   CFD modelling of slug flow inside square capillaries [J].
Taha, T ;
Cui, ZF .
CHEMICAL ENGINEERING SCIENCE, 2006, 61 (02) :665-675
[42]   Hydrodynamics of slug flow inside capillaries [J].
Taha, T ;
Cui, ZF .
CHEMICAL ENGINEERING SCIENCE, 2004, 59 (06) :1181-1190
[43]  
Tang C., 2015, PARTICUOLOGY
[44]   3-D numerical simulations on flow and mixing behaviors in gasliquidsolid microchannels [J].
Tang Can ;
Liu Mingyan ;
Xu Yonggui .
AICHE JOURNAL, 2013, 59 (06) :1934-1951
[45]   Dynamic pattern formation in a vesicle-generating microfluidic device [J].
Thorsen, T ;
Roberts, RW ;
Arnold, FH ;
Quake, SR .
PHYSICAL REVIEW LETTERS, 2001, 86 (18) :4163-4166
[46]   Milli-channel with metal foams under an applied gas-liquid periodic flow: External mass transfer performance and pressure drop [J].
Tourvieille, Jean-Noel ;
Philippe, Regis ;
de Bellefon, Claude .
CHEMICAL ENGINEERING JOURNAL, 2015, 267 :332-346
[47]   Effect of channel size on mass transfer during liquid-liquid plug flow in small scale extractors [J].
Tsaoulidis, Dimitrios ;
Angeli, Panagiota .
CHEMICAL ENGINEERING JOURNAL, 2015, 262 :785-793
[48]   NEAR-WAKE STRUCTURE OF A SINGLE GAS BUBBLE IN A TWO-DIMENSIONAL LIQUID-SOLID FLUIDIZED-BED - VORTEX SHEDDING AND WAKE SIZE VARIATION [J].
TSUCHIYA, K ;
FAN, LS .
CHEMICAL ENGINEERING SCIENCE, 1988, 43 (05) :1167-1181
[49]   Gas-Solid Fluidization in Mini- and Micro-channels [J].
Wang, Fei ;
Fan, Liang-Shih .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2011, 50 (08) :4741-4751
[50]   Performance of a slurry bubble column reactor for Fischer-Tropsch synthesis: Determination of optimum condition [J].
Woo, Kwang-Jae ;
Kang, Suk-Hwan ;
Kim, Seung-Moon ;
Bae, Jong-Wook ;
Jun, Ki-Won .
FUEL PROCESSING TECHNOLOGY, 2010, 91 (04) :434-439