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

LI Guobing; LI Ming; CHEN Song; HUANG Guoqiang

doi:10.3969/j.issn.0438-1157.2013.04.007

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

更新时间：2025-12-10

- Gas bypassing fraction of spouting gas in spout-fluid bed with draft tube
- CIESC Journal Issue 4, Pages: 1176-1182(2013)
- 作者机构：
  
  天津大学化工学院,天津,300072
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.04.007
  CLC： Q051TQ40.5
- Online First：05 April 2013，
  
  Published：05 April 2013
- 稿件说明：
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LI Guobing, LI Ming, CHEN Song, et al. Gas bypassing fraction of spouting gas in spout-fluid bed with draft tube[J]. CIESC Journal, 2013, (4): 1176-1182.
DOI：

LI Guobing, LI Ming, CHEN Song, et al. Gas bypassing fraction of spouting gas in spout-fluid bed with draft tube[J]. CIESC Journal, 2013, (4): 1176-1182. DOI： 10.3969/j.issn.0438-1157.2013.04.007.

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。

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.

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