流化床液固共存区域团聚结构表观黏结特性

doi:10.16085/j.issn.1000-6613.2015.05.007

化工进展 ›› 2015, Vol. 34 ›› Issue (05): 1225-1231.DOI: 10.16085/j.issn.1000-6613.2015.05.007

流化床液固共存区域团聚结构表观黏结特性

周云龙, 杨宁

东北电力大学能源与动力工程学院, 吉林吉林 132012

收稿日期:2014-08-20 修回日期:2014-12-27 出版日期:2015-05-05 发布日期:2015-05-05
通讯作者: 周云龙(1960—),男,教授,博士,主要从事多相流参数检测方面的研究.
作者简介:周云龙(1960—),男,教授,博士,主要从事多相流参数检测方面的研究.
基金资助:
国家自然科学基金项目(51276033).

Agglomerates growth characteristics in fluidized bed liquid-solids coexistence region

ZHOU Yunlong, YANG Ning

School of Energy and Power Engineering, Northeast Dianli University, Jilin 132012, Jilin, China

Received:2014-08-20 Revised:2014-12-27 Online:2015-05-05 Published:2015-05-05

摘要/Abstract

摘要： 通过TEB雾化喷嘴制造流化床团聚结构,利用层叠筛分方法对原始颗粒、成核聚团、黏结聚团、糊状聚团4种结构加以尺度区分,成功地实现了不同团聚阶段的分区域辨识.实验选取团聚结构最为稳定的异质共存区域为研究对象,对其黏结过程的表观结构特性和组织特性进行了分析.研究结果表明:成核聚团是诱导黏结聚团产生及增长的基本元素,团聚结构的黏结增长导致结构孔隙度随之增加,随着注入液体对孔隙结构的不断填充,结构逐渐趋于饱和,共存区域内任何尺度的团聚结构黏结增长速率均相同;尽管在异质共存区域内的团聚结构处于同一流化条件下,成核聚团及黏结聚团两者的水分含量及固体体积分数却表现出了明显的差异.

关键词: 共存区域, 团聚结构, 结构特性, 组织特性

Abstract: Fluidized bed agglomerates were generated by the TEB atomization nozzle,the sizes of original particles,nucleation agglomerates,coherence agglomerates,paste agglomerates were distinguished by the cascade screening method,and different agglomeration stages could be identified. The most stable heterogeneous agglomerates coexistence region was taken as the research object to analyze the structural and textural characteristics in the growth process. Nucleation agglomerates was the basic element inducing coherence agglomerates. Adhesive growth of agglomerates was accompanied by increased porosity. With the injection liquid continuously filling the pores,agglomerates were gradually saturated. Adhesive growth rates of agglomerates of any size in the coexistence region were the same. In spite of the same fluidization conditions of agglomerates in the coexistence region,moisture contents and solids volume fractions of nucleation and coherence agglomerates were obviously different.

Key words: coexistence region, agglomerates, structural characteristics, textural characteristics

中图分类号:

TK121

周云龙, 杨宁. 流化床液固共存区域团聚结构表观黏结特性[J]. 化工进展, 2015, 34(05): 1225-1231.

ZHOU Yunlong, YANG Ning. Agglomerates growth characteristics in fluidized bed liquid-solids coexistence region[J]. Chemical Industry and Engineering Progree, 2015, 34(05): 1225-1231.

参考文献

[1] Boduszynski M M,Grudoski D A,Rechesteiner C E. Deep-cut assay reveals additional yield of high-value VGO[J]. Oil Gas J.,1995,93(37):39-45.

[2] Chung H K,Xu C M,Hu Y X. Supercritical fluid extraction reveals resid properties[J]. Oil Gas J.,1997,95(3):66-69.

[3] 张希彬. 催化裂化汽油催化裂解反应规律研究[D]. 山东:中国石油大学,2007.

[4] 李强,王雷,张琪皓,等. 下行床反应器用于重油催化裂解制取低碳烯烃[J]. 化工学报,2004,55(7):1103-1108.

[5] McDougall S,Saberian M,Briens C. Using dynamic pressure signals to assess the effects of injected liquid on fluidized bed properties[J]. Chemical Engineering and Processing,2005,44(7):701-708.

[6] Jennifer M,Cedric B,Franco B. Flow stability in a downer mixing chamber[J]. Chemical Engineering and Processing,2006,45:798-805.

[7] Maryam M,Majid H,Cedric B. The effects of liquid properties and bed hydrodynamics on the distribution of liquid on solid fiuidized particles in a cold-model fluidized bed[J]. Powder Technology,2014,256:5-12.

[8] Stefan H,Jan Bn,Markus H. Study of dynamic multi-dimensional temperature and concentration distribution in liquid-sprayed fluidized beds[J]. Chemical Engineering Science,2003,58(23-24):5135-5160.

[9] Flora P,Cedric B,Franco B. Effect of particle size,liquid content and location on the stability of agglomerates in a fluidized bed[J]. Powder Technology,2013,237:376-385.

[10] Mills P J T,Seville J P K,Knight P C K. The effect of binder viscosity on particle agglomeration in a low shear mixer/agglomerator[J]. Powder Technology,2000,113(1-2):140-147.

[11] Saad M M,Barkouti A,Rondet E. Study of agglomeration mechanisms of food powders:Application to durum wheat semolina[J]. Powder Technology,2011,208(2):399-408.

[12] Ishmael Q,Ataollah N,William S,et al. Addai-Mensah. Single and mixed oxide and clay particle agglomeration:Influence of feed mineralogy and percent drum volume loading[J]. Powder Technology,2014,253(2):568-579.

[13] Thomas A,Anette S,Torben S. The effect of droplet size and powder particle size on the mechanisms of nucleation and growth in the fluid bed melt agglomeration[J]. International Journal of Pharmaceutics,2002,249(1-2):185-197.

[14] Sara W,Cedric B,Franco B,Edward C,et al. Effect of agglomerate properties on agglomerate stability in fluidized bed[J]. Chemical Engineering Science,2008,63(17):4245-4256.

[15] Simon M I,James D L,Karen H,Bryan J E.Nucleation,growth and breakage phenomena in agitated wet granulation processes:A review[J]. Powder Technology,2001,117(1-2):3-39.

[16] Base T E,Chan E W,Kennett R D. Nozzle for atomizing liquid in two phase flow:US,6003789[P]. 1999-12-21.

[17] McDougall S,Saberian M,Briens C. Characterization of fluidization quality in fludized beds of wet particles[J]. Int. J. Chem. React. Eng.,2004(2):1542-6580.

[18] Rondet E,Ruiz T,Delalonede M,et al. Fractal law:A new tool for modelling agglomeration process[J]. International Journal of Chemical Reactor Engineering,2010,8(1):1-12.

[19] Vicsek T. Fractal models for diffusion controlled aggregation[J]. Journal of Physics A:Mathematical and General,1983,16(17):647-652.

[20] Rondet E,Delalonde M,Ruiz T,et al. Fractal formation description of agglomeration in low shear mixer[J]. Chemical Engineering Journal,2010,164(2-3):376-382.

流化床液固共存区域团聚结构表观黏结特性

Agglomerates growth characteristics in fluidized bed liquid-solids coexistence region

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