汽-液-固三相流对石墨加热管内壁面磨损的实验研究

摘要

利用汽-液-固三相循环流化床蒸发器及动态信号测试采集系统，对石墨加热管内壁面的磨损进行了研究。实验测取了加热管不同轴向位置处振动加速度时间序列，对其进行了标准偏差和峰度分析，评估玻璃珠对壁面的径向冲击强度；通过测定循环流量，研究颗粒对壁面的轴向摩擦冲击程度。同时对磨损产物进行称量、元素分析，结合传感器测试结果共同确定石墨管壁面磨损速率的影响因素。主要结论如下：随着加热蒸汽压力的升高和颗粒体积分率的增加，壁面磨损速率增大；相同加热蒸汽压力和颗粒体积分率下，较小粒径颗粒对壁面的磨损更为严重。峰度分析表明，颗粒对壁面的冲击频率是影响石墨管磨损速率的主要因素。研究结果对将三相流化床换热技术应用于石墨管换热器系统具有一定的指导意义。

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	马悦
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关键词：汽-液-固三相流石墨管振动换热器磨损

Abstract：

Attrition of vapor-liquid-solid flow against the wall of a graphite heating tube was experimentally studied in the three-phase fluidized bed evaporator with signal acquisition and processing system. Time series data of vibration acceleration of the tube were acquired. Standard deviation and kurtosis of the vibration signals were analyzed to evaluate the radial collision strength of solid particles on the tube wall. The relationship between measured circulating flow rate and axial friction impact degree of solid particles against tube wall was also studied. The weight and elemental analysis of the attrition products were analyzed. Combined with the results mentioned above, the influence factors of wear rate of graphite tube wall impacted by glass beads were discussed. The main results are as follows. The mass wear rate of graphite tube wall increases with the increase of heating steam pressure and solid holdup. Under the same conditions of steam pressure and solid holdup, the wear of graphite tube is more serious for the smaller diameter of particles. Kurtosis of acceleration signals shows that the impact frequency of particles on the wall of tube is the main influence factor of wear rate of graphite tube wall. The results of this study can provide some guidelines for the application of three-phase fluidized bed heat exchanger technique to system of graphite tube heat exchanger.

Keywords： vapor-liquid-solid flow； graphite tube； vibration； heat exchanger； attrition

Received 2014-12-08;

Fund:

国家自然科学基金面上项目（21176176）；天津大学-青海民族大学自主创新基金合作项目（2013XZ-0083）。

Corresponding Authors: 刘明言,E-mail:myliu@tju.edu.cn。 Email: myliu@tju.edu.cn

About author: 马悦(1989-),男,硕士,主要从事于多相流蒸发器方面的研究。

引用本文:

马悦, 刘明言, 安敏, 徐晓萍.汽-液-固三相流对石墨加热管内壁面磨损的实验研究[J]. 化学工业与工程, 2016,33(4): 61-66

Ma Yue, Liu Mingyan, An Min, Xu Xiaoping.Experimental Study on Attrition of Vapor-Liquid-Solid Flow Against Wall of a Graphite Tube in Heat Exchanger[J]. Chemcial Industry and Engineering, 2016,33(4): 61-66

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