气固搅拌流化床中压力脉动特性

doi:10.11949/j.issn.0438-1157.20151253

化工学报 ›› 2016, Vol. 67 ›› Issue (2): 494-503.DOI: 10.11949/j.issn.0438-1157.20151253

气固搅拌流化床中压力脉动特性

张永俊, 王嘉骏, 顾雪萍, 冯连芳

浙江大学化学工程与生物工程学院, 化学工程联合国家重点实验室, 浙江杭州 310027

收稿日期:2015-08-03 修回日期:2015-11-01 出版日期:2016-02-05 发布日期:2016-02-05
通讯作者: 王嘉骏
基金资助:
国家自然科学基金项目(21276222);化学工程联合国家重点实验室开放课题资助项目(SKL-ChE-13D01);国家高技术研究发展计划项目(2012AA040305)。

Pressure fluctuation in gas-solid agitated fluidized bed

ZHANG Yongjun, WANG Jiajun, GU Xueping, FENG Lianfang

State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2015-08-03 Revised:2015-11-01 Online:2016-02-05 Published:2016-02-05
Supported by:
supported by the National Natural Science Foundation of China (21276222), the State Key Laboratory of Chemical Engineering (SKL-ChE-13D01) and the National High Technology Research and Development Program of China (2012AA040305).

摘要/Abstract

摘要：

气固搅拌流化床反应器可用于黏结性聚合物颗粒的流态化过程,流化床中通气湍动与搅拌的相互作用关系仍不明确。通过压力脉动的统计分析、功率谱分析和小波分析,考察了搅拌桨型式和搅拌转速对流态化特性的影响规律。实验发现,搅拌转速和搅拌桨型式对床层压力影响较小,但对压力脉动影响显著。搅拌流化床中搅拌与通气湍动对流态化共同作用,双层锚式桨、框式桨等小桨叶面积的搅拌桨在较高转速条件下能强化流态化过程,与普通流化床相比具有更小的气泡尺寸和压力脉动,搅拌可抑制气泡聚并、破碎气泡,维持床层均匀流态化;而新型具有大桨叶面积的自清洁桨的搅拌作用强烈,在较高的转速下易形成桨叶前方的颗粒堆积和桨叶后方的气体短路等非正常流化现象,适宜于中等转速的操作条件。

关键词: 流化床, 搅拌, 压力脉动, 统计分析, 多相流, 聚结

Abstract:

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.

Key words: fluidized bed, agitation, pressure fluctuation, statistics analysis, multiphase flow, coalescence

中图分类号:

TQ021

张永俊, 王嘉骏, 顾雪萍, 冯连芳. 气固搅拌流化床中压力脉动特性[J]. 化工学报, 2016, 67(2): 494-503.

ZHANG Yongjun, WANG Jiajun, GU Xueping, FENG Lianfang. Pressure fluctuation in gas-solid agitated fluidized bed[J]. CIESC Journal, 2016, 67(2): 494-503.

参考文献 21

[1]	JENKINS J M, JONES R L, JONES T M, et al. Method for fluidized bed polymerization:US4588790[P]. 1986-05-03.
[2]	WANG Z L, KWAUK M, LI H Z. Fluidization of fine particles[J]. Chem. Eng. Sci., 1998, 53(3):377-395.
[3]	REED T M, FENSKE M R. Effects of agitation on gas fluidization of solids[J]. Ind. Eng. Chem. Res., 1955, 47(2):275-282.
[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[J]. Chem. Eng. Sci., 1996, 51(21):4859-4886.
[5]	REINA J, VELO E, PUIGJANER L. Fluidization of waste-wood particles with mechanical agitation of the bed[J]. Ind. Eng. Chem. Res., 2001, 40(1):393-397.
[6]	KIM J, HAN G Y. Effect of agitation on fluidization characteristics of fine particles in a fluidized bed[J]. Powder Technol., 2006, 166(3):113-122.
[7]	GODARD K, RICHARDSON J F. The use of slow speed stirring to initiate particulate fluidisation[J]. Chem. Eng. Sci., 1969, 24(1):194-195.
[8]	NELSON B, BRIENS C, BERGOUGNOU M. Pressure fluctuations at individual grid holes of a gas-solid fluidized bed[J]. Powder Technol., 1993, 77(1):95-102.
[9]	张毅, 魏耀东, 时铭显. 气固循环流化床负压差下料立管的压力脉动特性[J]. 化工学报, 2007, 58(6):1417-1420. DOI:10.3321/j.issn:0438-1157.2007.06.013. ZHANG Y, WEI Y D, SHI M X. Characteristics of pressure fluctuation in standpipe at negative pressure gradient in circulating fluidized bed[J]. Journal of Chemical Industry and Engineering (China), 2007, 58(6):1417-1420. DOI:10.3321/j.issn:0438-1157. 2007.06.013.
[10]	李晓祥, 石炎福, 黄卫星, 等. 快速流化床提升管中气固流动行为的非线性分析[J]. 化工学报, 2004, 52(2):182-188. DOI:10.3321/j.issn:0438-1157.2004.02.008. LI X X, SHI Y F, HUANG W X, et al. Nonlinear analysis of gas-solid flow behavior in fast fluidized bed riser[J]. Journal of Chemical Industry and Engineering(China), 2004, 52(2):182-188. DOI:10.3321/j.issn:0438-1157.2004.02.008.
[11]	李凡, 冯连芳, 顾雪萍, 等. 气固搅拌流化床的床层压降[J]. 高校化学工程学报, 2002, 16(4):384-388. DOI:10.3321/j.issn:1003-9015. 2002.04.006. LI F, FENG L F, GU X P, et al. Pressure drop in the gas-solid stirred fluidized bed[J]. Journal of Chemical Engineering of Chinese Universities, 2002, 16(4):384-388. DOI:10.3321/j.issn:1003-9015.2002.04.006.
[12]	王嘉骏, 张文峰, 冯连芳, 等. 气固搅拌流化床压力脉动的小波分析[J]. 化工学报, 2006, 57(12):2854-2859. DOI:10.3321/j.issn:0438-1157.2006.12.012. WANG J J, ZHANG W F, FENG L F, et al. Wavelets analysis of pressure fluctuation in agitated fluidized bed[J]. Journal of Chemical Industry and Engineering(China), 2006, 57(12):2854-2859. DOI:10.3321/j.issn:0438-1157.2006.12.012.
[13]	冯连芳, 张文峰, 王嘉骏, 等. 气固搅拌流化床内的压力脉动特性[J]. 浙江大学学报(工学版), 2007, 41(3):524-528. DOI:10.3785/j.issn. 1008-973X.2007.03.032. FENG L F, ZHANG W F, WANG J J, et al. Pressure fluctuation in gas-solid agitated fluidized bed[J]. Journal of Zhejiang University(Engineering Science), 2007, 41(3):524-528. DOI:10.3785/j.issn. 1008-973X.2007.03.032.
[14]	SHI D P, LUO Z H, GUO A Y. Numerical simulation of the gas-solid flow in fluidized-bed polymerization reactors[J]. Ind. Eng. Chem. Res., 2010, 49(9):4070-4079.
[15]	顾雪萍, 韩颖, 王嘉骏, 等. 气固搅拌流化床内压力脉动特性的数值模拟[J]. 化工学报, 2013, 64(2):498-503. DOI:10.3969/j.issn. 0438-1157.2013.02.013. GU X P, HAN Y, WANG J J, et al. Numerical simulation on pressure fluctuation in an agitated fluidized bed[J]. CIESC Journal, 2013, 64(2):498-503. DOI:10.3969/j.issn.0438-1157.2013.02.013.
[16]	WANG J J, HAN Y, GU X P, et al. Effect of agitation on the fluidization behavior of a gas-solid fluidized bed with a frame impeller[J]. AIChE J., 2013, 59(4):1066-1074.
[17]	WILKINSON D. Determination of minimum fluidization velocity by pressure fluctuation measurement[J]. Can. J. Chem. Eng., 1995, 73(4):562-565.
[18]	ZHAO G B, YANG Y Y. Multiscale resolution of fluidized-bed pressure fluctuations[J]. AIChE J., 2003, 49(4):869-882.
[19]	LETTIERI P, DI FELICE R, PACCIANI R, et al. CFD modelling of liquid fluidized beds in slugging mode[J]. Powder Technol., 2006, 167(2):94-103.
[20]	FAN L T, HO T C, Hiraoka S, et al. Pressure fluctuations in a fluidized bed[J]. AIChE J., 1981, 27(3):388-396.
[21]	LIU M X, ZHANG Y M, BI H T, et al. Non-intrusive determination of bubble size in a gas-solid fluidized bed:an evaluation[J]. Chem. Eng. Sci., 2010, 65(11):3485-3493.

气固搅拌流化床中压力脉动特性

Pressure fluctuation in gas-solid agitated fluidized bed

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