化工学报 ›› 2017, Vol. 68 ›› Issue (9): 3397-3403.DOI: 10.11949/j.issn.0438-1157.20170675

• 流体力学与传递现象 • 上一篇    下一篇

二项式分布在种群平衡模型模拟粒度分布中的应用

李振亮1,2, 卢培利3,4, 张代钧3,4, 周志恩2, 张晟2, 何强1,5   

  1. 1 重庆大学城市建筑与环境工程学院, 重庆 400044;
    2 重庆市环境科学研究院, 重庆 401147;
    3 重庆大学煤矿灾害动力学与控制国家重点实验室, 重庆 400044;
    4 重庆大学环境科学系, 重庆 400044;
    5 重庆大学三峡库区生态环境教育部重点实验室, 重庆 400044
  • 收稿日期:2017-05-25 修回日期:2017-06-29 出版日期:2017-09-05 发布日期:2017-09-05
  • 通讯作者: 卢培利
  • 基金资助:

    国家自然科学基金项目(5160091049);重庆市科委专项基金项目(2015CSTC-JBKY-01605);重庆市基础科学与前沿技术研究专项项目(CSTC2016jcyjA0506)。

Application of binomial distribution for daughter particles in simulation of particle size distribution by population balance model

LI Zhenliang1,2, LU Peili3,4, ZHANG Daijun3,4, ZHOU Zhi'en2, ZHANG Sheng2, HE Qiang1,5   

  1. 1 College of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, China;
    2 Chongqing Research Academy of Environmental Sciences, Chongqing 401147, China;
    3 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;
    4 Department of Environmental Science, Chongqing University, Chongqing 400044, China;
    5 Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400045, China
  • Received:2017-05-25 Revised:2017-06-29 Online:2017-09-05 Published:2017-09-05
  • Contact: 10.11949/j.issn.0438-1157.20170675
  • Supported by:

    supported by the National Natural Science Foundation of China (5160091049),the Natural Science Foundation of Chongqing (2015CSTC-JBKY-01605) and the Chongqing Research Program of Basic Research and Frontier Technology (CSTC2016jcyjA0506).

摘要:

提出了一种适用于几何网格的子粒子二项式分布函数,并应用于种群平衡模型模拟活性污泥絮凝后的粒度分布。结果表明:与二元分布相比,该二项式分布可以得到更准确的粒度分布和平均粒度模拟值;通过校核二项式分布参数Cp的取值,可以提高粒度分布和平均粒度的模拟精度。相比于二元分布或正态分布只能描述一种类型的子粒子分布,该二项式分布具有较强的适应性,调整参数Cp的取值,可以得到更多可能的子粒子分布;参数Cp还可以表征粒子的破碎方式——较小的Cp值表征粒子具有较强的稳定性,易破碎生成较大的子粒子;较大的Cp值表征粒子具有较弱的稳定性,易破碎生成较小的子粒子。

关键词: 种群平衡, 二项式分布, 粒度分布, 数值模拟, 破碎, 子粒子

Abstract:

A binomial distribution function suitable for geometric grid was proposed and applied in population balance model (PBM) to simulate the particle size distribution (PSD) of activated sludge after flocculation. The results showed that the PSD and mean size simulated by using binomial distribution give better agreement with the experimental data than those simulated by using binary distribution. The accuracy of simulation of PSD and mean size can be improved by calibrating the value of parameter Cp of binomial distribution function. Different from other daughter particle distribution which can only describe one-type daughter particle distribution, the binomial distribution function shows a strong adaptability and can present more probable daughter particle distributions through adjusting the parameter Cp. Moreover, the value of parameter Cp might also characterize breakage behavior of particle:a smaller Cp value might imply that the particle display strong stability leading to large numbers of large daughter particle, whereas a larger Cp value might imply that the particle display weak stability and the large-scale fragmentation resulting in large numbers of small daughter particle.

Key words: population balance, binomial distribution, particle size distribution, numerical simulation, breakage, daughter particle

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