振动辅助纳米颗粒聚团流化实验研究

doi:10.7523/j.issn.2095-6134.2020.02.009

中国科学院大学学报 ›› 2020, Vol. 37 ›› Issue (2): 204-209.DOI: 10.7523/j.issn.2095-6134.2020.02.009

振动辅助纳米颗粒聚团流化实验研究

赵之端, 刘道银, 马吉亮, 陈晓平

东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室, 南京 210096

收稿日期:2019-04-03 修回日期:2019-05-29 发布日期:2020-03-15
通讯作者: 刘道银
基金资助:
国家自然科学基金（51676042）资助

Experimental study on fluidization of nanoparticle agglomerates with the assistance of vibration

ZHAO Zhiduan, LIU Daoyin, MA Jiliang, CHEN Xiaoping

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Received:2019-04-03 Revised:2019-05-29 Published:2020-03-15

摘要/Abstract

摘要： 在内径40 mm的流化床实验台上，研究SiO₂、Al₂O₃和TiO₂ 3种纳米颗粒在振动辅助流化时不同振幅、频率下的流化特性，比较振动对不同黏性纳米颗粒流化的改善程度及原因。结果表明，在无振动条件下，SiO₂纳米颗粒达到稳定状态时表现为散式流态化；Al₂O₃和TiO₂纳米颗粒在流化床底部形成较大的聚团，导致明显的流化分层现象。在振动条件下，SiO₂纳米颗粒的临界流化速度降低，床层膨胀高度随着振幅和频率的增加而降低；而对于Al₂O₃和TiO₂颗粒，随着振幅和频率的增加，临界流化速度降低，床层膨胀高度增加，流化床底部的聚团尺寸减小，但当频率和振幅较低时，振动对其流化行为无明显改善。振动强化了纳米颗粒聚团的碰撞，具有促进聚团破碎和密实化的双重作用。针对不同黏性的纳米颗粒，若要达到最优的流化质量，需要探索不同的振动参数。

关键词: 纳米颗粒, 聚团, 流化特性, 振动

Abstract: The fluidization characteristics of SiO₂, Al₂O₃, and TiO₂ nanoparticles with the assistance of vibration at different frequencies and amplitudes are studied in a plexiglass fluidized bed with the inner diameter of 40 mm. The effects of vibration on fluidization of nanoparticles with different cohesiveness are compared. The results show that, without vibration, the SiO₂ nanoparticle agglomerates are fluidized smoothly while the Al₂O₃ and TiO₂ nanoparticle agglomerates are fluidized with segregation because there are large agglomerates at the bottom of the fluidized bed. When the vibration is introduced, the minimum fluidization velocity of SiO₂ decreases,and the bed expansion ratio of SiO₂ decreases with the increase of amplitude and frequency. For the Al₂O₃ and TiO₂ nanoparticles, as the amplitude and frequency increase, the minimum fluidization velocity decreases, the bed expansion ratio increases, and the agglomerate size decreases at the bottom of the fluidized bed. However, the vibration makes no significant improvement in fluidization at low frequency and low amplitude for the Al₂O₃ and TiO₂ nanoparticles. Vibration enhances the collision of nanoparticle agglomerates and has the dual effect of promoting the breakage and compaction of the agglomerates. The optimal vibration parameters need to be explored to achieve the optimal fluidization quality of different nanoparticles.

Key words: nanoparticles, agglomerates, fluidization characteristic, vibration

中图分类号:

TQ021

赵之端, 刘道银, 马吉亮, 陈晓平. 振动辅助纳米颗粒聚团流化实验研究[J]. 中国科学院大学学报, 2020, 37(2): 204-209.

ZHAO Zhiduan, LIU Daoyin, MA Jiliang, CHEN Xiaoping. Experimental study on fluidization of nanoparticle agglomerates with the assistance of vibration[J]. , 2020, 37(2): 204-209.

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振动辅助纳米颗粒聚团流化实验研究

Experimental study on fluidization of nanoparticle agglomerates with the assistance of vibration

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