探针法测量微细颗粒固定床有效热导率

doi:10.16085/j.issn.1000-6613.2017.06.006

摘要/Abstract

摘要： 针对微小反应器内多孔介质涉及的复杂热质传递问题，设计并搭建热导率测试装置，经标定，测量误差控制在2.97%内，可重复性良好。利用探针法测量了微小反应器固定床内微细树脂颗粒有效热导率，对其随粒径、孔隙率、流速、有无离子交换等工况的变化进行了研究。结果表明：干燥状态下有效热导率随颗粒粒径与孔隙率的增大而减小，低流量（0.8mL/min、1.6mL/min、3.2mL/min）下有效热导率随粒径与孔隙率增大而增大，经交换离子处理前后有效热导率基本不变，说明探针法测量热导率的应用不受颗粒中离子变化和相关化学处理的影响。不同区域细沙和土壤的实验结果进一步验证了上述结论，表明探针法测量微细颗粒固定床有效热导率是一种可靠、有效的在线测量方法。

关键词: 多孔介质, 测量, 固定床, 探针法, 热导率

Abstract: For exploring the complex phenomena of heat and mass transfer in the micro-particle packed bed,the device to measure thermal conductivity was designed and built. The experiments showed that the error is less than 2.97% after calibrated by the probe factor,and reproducibility is good. Effects of particles diameters,porosity,velocity of flow and changes in reaction on the thermal conductivity of micro-particles were investigated experimentally by thermal probe method. The results indicated that the effective thermal conductivity in dry declined with the size of particles and porosity increase. The effective thermal conductivity in low velocity fluid(0.8mL/min,1.6mL/min,3.2mL/min) is converse. The thermal conductivity of the resin particles after the ion exchange with the conditions of dry and low velocity fluid has not changed much. The chemical reaction and interrelated processing has no significant influence on the thermal conductivity of particles by comparing with exchange of the ions of particles. The thermal conductivities of the soil from different areas in different ions further verify the above conclusions. It is a reliable and effective on-line method to measure the effective thermal conductivity of the micro-particle packed bed by thermal probe method.

Key words: porous media, measurement, fixed-bed, thermal conductivity probe, thermal conductivity

中图分类号:

O353.5

张心怡, 郑艺华, 冯守玲. 探针法测量微细颗粒固定床有效热导率[J]. 化工进展, 2017, 36(06): 2010-2016.

ZHANG Xinyi, ZHENG Yihua, FENG Shouling. A study on the heat probe to measure effective thermal conductivity of micro-particle packed bed[J]. Chemical Industry and Engineering Progress, 2017, 36(06): 2010-2016.

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