化工学报 ›› 2019, Vol. 70 ›› Issue (5): 1693-1701.doi: 10.11949/j.issn.0438-1157.20181179

• 流体力学与传递现象 • 上一篇    下一篇

刚柔组合桨强化粉煤灰酸浸搅拌槽内固液混沌混合

熊黠1(),刘作华1(),谷德银1,邱发成1,王靓1,陶长元1,王运东2   

  1. 1. 重庆大学化学化工学院,重庆 400044
    2. 清华大学化学工程系,北京 100084
  • 收稿日期:2018-10-10 修回日期:2019-02-19 出版日期:2019-05-05 发布日期:2019-05-10
  • 通讯作者: 刘作华 E-mail:1457069686@qq.com;liuzuohua@cqu.edu.cn
  • 作者简介:<named-content content-type="corresp-name">熊黠</named-content>(1993—),女,硕士研究生,<email>1457069686@qq.com</email>|刘作华(1973—),男,博士,教授,<email>liuzuohua@cqu.edu.cn</email>
  • 基金资助:
    国家重点研发计划项目(2017YFB0603105);国家自然科学基金项目(21636004);重庆市研究生科研创新项目(CYS18031);重庆市社会事业与民生保障科技创新专项项目(cstc2017shmsA90016);国家科技支撑计划项目(2015BAB17B01)

Chaotic mixing process of fly ash in acid leaching tank intensified by rigid-flexible impeller

Xia XIONG1(),Zuohua LIU1(),Deyin GU1,Facheng QIU1,Liang WANG1,Changyuan TAO1,Yundong WANG2   

  1. 1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
    2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2018-10-10 Revised:2019-02-19 Online:2019-05-05 Published:2019-05-10
  • Contact: Zuohua LIU E-mail:1457069686@qq.com;liuzuohua@cqu.edu.cn

摘要:

传统粉煤灰提铝工艺中酸浸搅拌槽均采用刚性搅拌桨。因刚性桨卷吸能力有限,导致固体颗粒易沉槽、流体混沌混合效率低。提出刚柔组合桨强化酸浸搅拌槽中固液混沌混合行为。实验基于固含率为30%的粉煤灰-自来水体系,研究了刚柔组合酸浸搅拌槽内混沌混合特性及能量耗散规律。采用扭矩传感器采集扭矩时间序列信号,借助Matlab软件编译计算混合过程中最大Lyapunov指数和多尺度熵等混沌特性参数,以单位体积功耗表征搅拌反应器的功率特性。实验考察了搅拌桨安装离底高度、柔性片长度、柔性片宽度等因素对酸浸槽内粉煤灰混沌混合的影响,对比了刚性桨与刚柔组合桨体系的能耗差异。研究结果表明:刚柔组合桨通过柔性片的作用,能增大搅拌桨的卷吸力,进而减少固体颗粒沉槽现象,促进全槽混沌混合;在最优化条件(120 r/min,搅拌桨安装离底高度为T/4,柔性片长度为1.2H 1、柔性片宽度为D/8)下,体系最大Lyapunov指数达到最大值0.0645,各尺度下的MSE均比其他条件更大,表明刚柔组合桨能够通过柔性片的多体运动,强化体系混沌混合,均化体系能量分布;刚性桨与刚柔组合桨的单位体积功耗随着转速的增加呈现指数规律增长。

关键词: 刚柔组合桨, 粉煤灰, 混沌混合, 最大Lyapunov指数, 多尺度熵

Abstract:

In the traditional fly ash aluminizing process, the acid immersion stirring tank adopts a rigid stirring paddle. Due to the limited pumping capacity of rigid impellers, some problems such as settlement of solid particles, deficiently of chaotic, and low efficiency of mixing in this process often occur in solid-liquid mixing processes. Thus, the rigid-flexible impeller was adopted to enhance solid-liquid chaotic mixing behavior in acid leaching process. In a fly ash-water system with a solids concentration of 30%, the chaotic mixing characteristics and energy dissipation were investigated in STRs equipped with rigid-flexible impeller. Torque sensor was employed to collect the torque time series signal. The largest Lyapunov exponents and the multi-scale entropy were compiled and calculated by Matlab to indicate the degree of chaotic mixing based on the torque time series signal. Meanwhile, the power consumption per unit volume was used to characterize the stirred reactor power characteristics. The effects of impeller types, rotation speed, flexible piece width/length, and impeller off-bottom clearance on chaotic mixing behavior were taken into consideration in the solid-liquid mixing processes. The results showed that the rigid-flexible impeller could effectively promote the chaotic mixing and reduce the accumulation of solid particles at the bottom of STRs in the fly ash-water system. Largest Lyapunov exponents of the system reached the maximum value of 0.0645 and multi-scale entropy was bigger than that of other conditions at the rotation speed of 120 r/min, the off-bottom clearance of T/4, the flexible piece length of 1.2H 1 and width of D/8. The power consumption increases exponentially with the increase of rotation speed.

Key words: rigid-flexible impeller, coal ash, chaotic mixing, largest Lyapunov exponents, multi-scale entropy

中图分类号: 

  • TQ 027.2

图1

实验装置"

图2

实验所用桨叶类型"

图3

搅拌槽中固液混合示意图"

表1

搅拌介质"

搅拌介质 密度/(kg/m3 质量分数/%
粉煤灰 2400 30
自来水 998.2 70

图4

搅拌桨类型对LLE 的影响"

图5

柔性片长度对LLE的影响"

图6

柔性片宽度对LLE的影响"

图7

搅拌桨离底高度对LLE的影响"

图8

搅拌桨类型对MSE的影响"

图9

柔性片长度对MSE的影响"

图10

柔性片宽度对MSE 的影响"

图11

搅拌桨离底高度对MSE的影响"

图12

比较不同转速下两体系P v "

图13

两体系P v随转速增长速率变化"

图14

粉煤灰颗粒悬浮状态随时间的变化"

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