传质控制下宽分布石膏颗粒群溶解特性

doi:10.11949/j.issn.0438-1157.20180110

化工学报 ›› 2018, Vol. 69 ›› Issue (10): 4177-4183.DOI: 10.11949/j.issn.0438-1157.20180110

传质控制下宽分布石膏颗粒群溶解特性

宫源, 罗安安, 朱家骅, 薛潇, 王茜

四川大学化学工程学院, 四川成都 610065

收稿日期:2018-01-24 修回日期:2018-06-27 出版日期:2018-10-05 发布日期:2018-10-05
通讯作者: 朱家骅
基金资助:
国家自然科学基金项目（91434121）；中国石化低碳技术基础研究项目（415026）。

Dissolution characteristic of gypsum particles with wide size distribution under mass transfer controlling

GONG Yuan, LUO An'an, ZHU Jiahua, XUE Xiao, WANG Qian

School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China

Received:2018-01-24 Revised:2018-06-27 Online:2018-10-05 Published:2018-10-05
Supported by:
supported by the National Natural Science Foundation of China (91434121).

摘要/Abstract

摘要：

烟气CO₂直接与工业固废磷石膏矿化反应生成碳酸钙与硫酸铵的控速步骤是磷石膏的溶解。在传质控制下，准确表达溶解特性是矿化反应器设计的理论依据。采用种群平衡模型预测传质控制下粒径宽分布石膏颗粒群溶解特性，采用矩积分法和特征线法对模型进行数值求解并与传统的平均粒径模型表达进行对比。结果显示：种群平衡模型反映了粒径分布对溶解速率的影响，计算得到溶解过程中总容积传质系数的变化，与实验结果吻合良好，证实了种群平衡模型预测的可靠性。与之相比，平均粒径模型预测溶解速率值比实验值偏大，由此解释了工业反应器中物料实际停留时间大于模型计算值的原因。

关键词: 溶解, 扩散, 传质, 种群平衡, 粒度分布

Abstract:

The rate-control step of the direct reaction of flue gas CO₂ with industrial solid waste phosphogypsum mineralization to form calcium carbonate and ammonium sulfate is the dissolution of phosphogypsum. Expressing exactly the dissolution characteristics provides theory basis for designing mineralize reactor under mass transfer controlling. In this study, the dissolution characteristics of gypsum particles which had wide size distribution were predicted through population balance model. The results were compared with classical average size model showed the influence of size distribution on dissolution rate. The variation of total volumetric mass transfer coefficient was calculated and in agreement with the experimental data to confirm the reliability of population balance model. In contrast, the average particle size model predicts that the dissolution rate value is larger than the experimental value, thereby explaining why the actual residence time of the material in the industrial reactor is greater than the calculated value of the model.

Key words: dissolution, diffusion, mass transfer, population balance, particle size distribution

中图分类号:

TQ021.4

宫源, 罗安安, 朱家骅, 薛潇, 王茜. 传质控制下宽分布石膏颗粒群溶解特性[J]. 化工学报, 2018, 69(10): 4177-4183.

GONG Yuan, LUO An'an, ZHU Jiahua, XUE Xiao, WANG Qian. Dissolution characteristic of gypsum particles with wide size distribution under mass transfer controlling[J]. CIESC Journal, 2018, 69(10): 4177-4183.

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传质控制下宽分布石膏颗粒群溶解特性

Dissolution characteristic of gypsum particles with wide size distribution under mass transfer controlling

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