探针法测量微细颗粒固定床有效热导率

发布时间：2018-08-20 10:21

【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。
[Abstract]:Aiming at the complex heat and mass transfer problem involving porous media in a micro reactor, a thermal conductivity testing device was designed and built. The calibration results show that the measurement error is controlled within 2.97% and the repeatability is good. The effective thermal conductivity of micro-resin particles in a fixed bed was measured by the probe method, and the changes of the effective thermal conductivity with particle size, porosity, flow rate and ion exchange were studied. The results show that the effective thermal conductivity decreases with the increase of particle size and porosity, and increases with the increase of particle size and porosity at low flow rate (0.8 mL / min, 1.6 mL / min, 3.2 mL / min), and the effective thermal conductivity is almost unchanged before and after ion exchange treatment. The results show that the application of the probe method to the measurement of thermal conductivity is not affected by the change of ions in the particles and the related chemical treatment. The experimental results of fine sand and soil in different regions further verify the above conclusion, which indicates that the probe method is a reliable and effective on-line measurement method for measuring the effective thermal conductivity of micro-particle fixed bed.
【作者单位】：青岛大学机电工程学院;
【基金】：山东省自然科学基金(ZR2014EEM004) 山东省重点研发计划(2015GSF117019)项目
【分类号】：TQ052

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