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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。
The wear of the graphite heating tube’s inner wall was studied by vapor-liquid-solid three-phase circulating fluidized bed evaporator and dynamic signal acquisition system. The time series of vibration acceleration at different axial positions of the heating tube was measured experimentally, and the standard deviation and kurtosis analysis were carried out to evaluate the radial impact strength of glass beads on the wall. By measuring the circulating flow, Friction impact degree. At the same time, wear products were weighed, elemental analysis, combined with the sensor test results to determine the factors affecting the wear rate of graphite tube wall. The main conclusions are as follows: With the increase of heating steam pressure and the increase of particle volume fraction, the wall wear rate increases. The smaller the particle size, the smaller the particle size, the more serious the wear on the wall under the same heating vapor pressure and particle volume fraction. The kurtosis analysis shows that the impact frequency of particles on the wall is the main factor that affects the wear rate of graphite tube. The results of the study have certain guiding significance for the application of three-phase fluidized bed heat exchange technology to graphite tube heat exchanger system.