导向管喷动流化床的喷动气旁路分率

doi:10.3969/j.issn.0438-1157.2013.04.007

化工学报 ›› 2013, Vol. 64 ›› Issue (4): 1176-1182.DOI: 10.3969/j.issn.0438-1157.2013.04.007

导向管喷动流化床的喷动气旁路分率

李国兵, 李明, 陈松, 黄国强

天津大学化工学院,天津 300072

收稿日期:2012-09-06 修回日期:2012-12-12 出版日期:2013-04-05 发布日期:2013-04-05
通讯作者: 陈松
作者简介:李国兵(1973—),男,副教授。

Gas bypassing fraction of spouting gas in spout-fluid bed with draft tube

LI Guobing, LI Ming, CHEN Song, HUANG Guoqiang

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2012-09-06 Revised:2012-12-12 Online:2013-04-05 Published:2013-04-05

摘要/Abstract

摘要： 在内径为182 mm的喷动流化床中安装内径80 mm的导向管,以平均粒径为2.2 mm的尿素颗粒为物料,对喷动气旁路特性进行了实验研究,分别考察了夹带区高度、导向管长度、喷嘴内径、床层高度、喷动气速和流化气速对喷动气旁路分率的影响,结果表明随着喷动气速的增大,喷动气体旁路分率先增后减。导向管安装高度越高,气体旁路分率越大。床层高度增大喷动气体旁路分率略有降低。而喷嘴直径小于50 mm时气体旁路分率随喷嘴直径增大而提高,在大于50 mm时气体旁路分率随喷嘴直径增大维持不变。当气速较小时,导向管高度增大会引起气体旁路分率增大,引入少量流化气能有效地抑制喷动气旁路。

关键词: 喷动流化床, 导向管, 气体旁路

Abstract: A cylindrical spout-fluid bed(182 mm inner diameter) equipped with a 80 mm inner diameter draft tube and loaded with urea particles(2.2 mm average particle size) was used to study gas bypassing fraction of spouting gas.The effects of spout nozzle diameter, draft tube length, bed height, entrainment height, spouting velocity and fluidizing velocity on gas bypassing fraction of spouting gas were investigated. The results showed that with increasing spouting velocity, gas bypassing fraction increased first and decreased later.Gas bypassing fraction increased with increasing entrainment height,but decreased slightly with increasing static bed height.When spout nozzle diameter was less than 50 mm, gas bypassing fraction increased with increasing nozzle diameter, but remained unchanged when nozzle diameter was greater than 50 mm.When spouting velocity was low, gas bypassing fraction increased with increasing draft tube length.The introduction of a small amount of fluidizing gas could effectively suppress gas bypassing.

Key words: spouting-fluid bed, draft tube, gas bypassing

中图分类号:

TQ051
TQ40.5

李国兵, 李明, 陈松, 黄国强. 导向管喷动流化床的喷动气旁路分率[J]. 化工学报, 2013, 64(4): 1176-1182.

LI Guobing, LI Ming, CHEN Song, HUANG Guoqiang. Gas bypassing fraction of spouting gas in spout-fluid bed with draft tube[J]. CIESC Journal, 2013, 64(4): 1176-1182.

参考文献 16

[1]	Nagashima H, Ishikura T, Ide M.Flow regimes and vertical solids conveying in a spout-fluid bed with a draft tube[J].The Canadian Journal of Chemical Engineering, 2011,89(2):264-273
[2]	Xu J, et al.Minimum spouting velocity in a spout-fluid bed with a draft tube[J].The Canadian Journal of Chemical Engineering, 2009,87(2):274-278
[3]	Ishikura T, Nagashima H, Ide M.Hydrodynamics of a spouted bed with a porous draft tube containing a small amount of finer particles[J].Powder Technology, 2003,131(1):56-65
[4]	Zhao Xianglong(赵香龙),Yao Qiang(姚强),Li Shuiqing(李水清).Hydrodynamics of a spouted bed with draft tube[J].Journal of Combustion Science and Technology(燃烧科学与技术), 2005,11(2):183-187
[5]	Marmo L.Low temperature drying of pomace in spout and spout-fluid beds[J].Journal of Food Engineering, 2007, 79(4):1179-1190
[6]	Fukumori Y, Ichikawa H.Coating of pharmaceuticals and fluidized bed[J].Japanese Journal of Multiphase Flow, 2004,18(3):214-222
[7]	Kfuri C, Freitas L.A comparative study of spouted and spout-fluid beds for tablet coating[J].Drying Technology, 2005,23(12):2369-2387
[8]	Hatate Y, Ijichi K, Uemura Y.Flow characteristics of draft tube spouted bed and its application[J].Journal-Society of Powder Technology, 1997,34:343-360
[9]	Park K B, et al.Mortar properties obtained by dry premixing of cementitious materials and sand in a spout-fluid bed mixer[J].Cement and Concrete Research, 2006,36(4):728-734
[10]	Xiao Rui, Zhang Mingyao, et al.Solids circulation flux and gas bypassing in a pressurized spout-fluid bed with a draft tube[J].The Canadian Journal of Chemical Engineering, 2002,80(5):800-808
[11]	Chandel M K, Alappat B J.Pressure drop and gas bypassing in recirculating fluidized beds[J].Chemical Engineering Science, 2006,61(5):1489-1499
[12]	Zhong Wenqi, Xiao Rui, Zhang Mingyao.Experimental study of gas mixing in a spout-fluid bed[J].AIChE Journal, 2006, 52(3):924-930
[13]	Jeon J H, et al.Solid circulation and gas bypassing characteristics in a square internally circulating fluidized bed with draft tube[J].Chemical Engineering and Processing:Process Intensification, 2008,47(12):2351-2360
[14]	Ahn H S, et al.Solid circulation and gas bypassing in an internally circulating fluidized bed with an orifice-type draft tube[J].Korean Journal of Chemical Engineering, 1999, 16(5):618-623
[15]	Song B H, Kim Y T, Kim S D.Circulation of solids and gas bypassing in an internally circulating fluidized bed with a draft tube[J].Chemical Engineering Journal, 1997,68(2/3):115-122
[16]	Yang Hu(杨虎),Shi Yanfu(石炎福).Study on voidage in gas-solid fluidized bed[J].Journal of Sichuan Institute of Light Industry and Chemical Technology(四川轻化工学院学报),2001,14(1):5-9

导向管喷动流化床的喷动气旁路分率

Gas bypassing fraction of spouting gas in spout-fluid bed with draft tube

PDF (PC)

可视化

被引次数

摘要/Abstract

引用本文

使用本文

参考文献 16

相关文章 8

编辑推荐

Metrics

本文评价

[1]	高凯歌, 雷玉庄, 李海念, 周勇. 超细粉在声场导向管喷流床中的聚团尺寸预测模型[J]. 化工学报, 2017, 68(6): 2290-2297.
[2]	谢恒来, 吴曼, 赵军, 陈义忠, 郭庆杰. 导向管喷动流化床中废弃印刷线路板的非金属颗粒包覆改性[J]. 化工学报, 2015, 66(3): 1185-1193.
[3]	李乾军, 章名耀, 施爱阳, 宋占龙. 钙基脱硫剂增压喷动流化床煤气化炉的炉内脱硫 [J]. 化工学报, 2008, 59(1): 189-194.
[4]	钟文琪;章名耀. 基于信息熵分析的喷动流化床流动特性 [J]. CIESC Journal, 2005, 56(12): 2303-2308.
[5]	周勇;马兰;石炎福. 超细粉在导向管喷动床中的固体循环速率 [J]. CIESC Journal, 2004, 55(9): 1532-1536.
[6]	唐凤翔;张济宇. 喷动流化床最小喷动流化速度的多因素影响与关联 [J]. CIESC Journal, 2004, 55(7): 1083-1091.
[7]	陈明强,颜涌捷,任铮伟,毛元夫. 导向管喷动流化床内颗粒停留时间模型 [J]. CIESC Journal, 1998, 49(5): 586-591.
[8]	李宝霞,张济宇. 循环喷动流化床固体流动规律 [J]. CIESC Journal, 1995, 46(5): 635-640.