Pressure fluctuation in gas-solid agitated fluidized bed

被引：0

作者：

Zhang, Yongjun ^{[1
]}

Wang, Jiajun ^{[1
]}

Gu, Xueping ^{[1
]}

Feng, Lianfang ^{[1
]}

机构：

[1] State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, Zhejiang

来源：

Huagong Xuebao/CIESC Journal | 2016年 / 67卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Agitation; Coalescence; Fluidized bed; Multiphase flow; Pressure fluctuation; Statistics analysis;

D O I：

10.11949/j.issn.0438-1157.20151253

中图分类号：

学科分类号：

摘要：

Gas-solid agitated fluidized beds can be used to improve the fluidization performance of sticky polymer particles. Experimental pressure fluctuation signals were analyzed with statistics analysis, power spectrum analysis and wavelet analysis for investigating the influence of agitation speeds and types of agitators on the fluidization characteristic. Due to the effects of suppression and breakage on bubbles caused by agitation, lower pressure fluctuation amplitude and smaller bubbles were found in the agitated fluidized bed compared to general fluidized bed. The synergy between gas flow and agitation occurred in the agitated fluidized bed. For a gas-solid fluidized bed with an anchor impeller or a frame impeller, sufficiently high agitation speed was needed to improve fluidization performance. However, for self-cleaning agitator, higher agitation speed engendered adverse phenomena of gas short circuit and particles accumulation near the blades. Therefore, the feasible agitation speed was recommended for extending the application of the new self-cleaning agitator in industry. © All Right Reserved.

引用

页码：494 / 503

页数：9

共 21 条

[1]

Jenkins J.M., Jones R.L., Jones T.M., Et al., Method for fluidized bed polymerization: US4588790, (1986)

[2]

Wang Z.L., Kwauk M., Li H.Z., Fluidization of fine particles, Chem. Eng. Sci., 53, 3, pp. 377-395, (1998)

[3]

Reed T.M., Fenske M.R., Effects of agitation on gas fluidization of solids, Ind. Eng. Chem. Res., 47, 2, pp. 275-282, (1955)

[4]

Zacca J.J., Debling J.A., Ray W.H., Reactor residence time distribution effects on the multistage polymerization of olefins (I): Basic principles and illustrative examples, polypropylene, Chem. Eng. Sci., 51, 21, pp. 4859-4886, (1996)

[5]

Reina J., Velo E., Puigjaner L., Fluidization of waste-wood particles with mechanical agitation of the bed, Ind. Eng. Chem. Res., 40, 1, pp. 393-397, (2001)

[6]

Kim J., Han G.Y., Effect of agitation on fluidization characteristics of fine particles in a fluidized bed, Powder Technol., 166, 3, pp. 113-122, (2006)

[7]

Godard K., Richardson J.F., The use of slow speed stirring to initiate particulate fluidisation, Chem. Eng. Sci., 24, 1, pp. 194-195, (1969)

[8]

Nelson B., Briens C., Bergougnou M., Pressure fluctuations at individual grid holes of a gas-solid fluidized bed, Powder Technol., 77, 1, pp. 95-102, (1993)

[9]

Zhang Y., Wei Y.D., Shi M.X., Characteristics of pressure fluctuation in standpipe at negative pressure gradient in circulating fluidized bed, Journal of Chemical Industry and Engineering (China), 58, 6, pp. 1417-1420, (2007)

[10]

Li X.X., Shi Y.F., Huang W.X., Et al., Nonlinear analysis of gas-solid flow behavior in fast fluidized bed riser, Journal of Chemical Industry and Engineering (China), 52, 2, pp. 182-188, (2004)

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