On-line size measurement of pneumatically conveyed particles through acoustic emission sensing
On-line size measurement of pneumatically conveyed particles through acoustic emission sensing
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DOI：
10.1016/j.powtec.2019.05.023
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发表时间：
2019-07
影响因子：
5.2
通讯作者：
Guoqiang Zhang;Yong Yan;Yonghui Hu;Ge Zheng
中科院分区：
文献类型：
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作者：
Guoqiang Zhang;Yong Yan;Yonghui Hu;Ge Zheng
近年来，声发射（AE）方法被提出用于连续输送颗粒的在线粒度测量。然而，有有限的研究基于AE的颗粒测量技术的基本机制。为了实现更精确的颗粒尺寸测量，应该以更真实的方式描述颗粒与波导之间的碰撞。在本文中，一个改进的模型的基础上的冲击理论，提出了建立所产生的AE信号和被测颗粒尺寸之间的关系。在单颗粒实验台上对改进模型进行了验证。使用平均直径分别为0.4、0.6、0.8、1.0和1.2 mm的总共五组玻璃珠作为测试颗粒，冲击速度范围为22 m/s至37 m/s。结果表明，Stronge碰撞理论比Hertzian碰撞理论更能准确地描述碰撞过程，更适合于颗粒粒径的反演，并通过对两种碰撞理论反演结果的比较验证了这一点。同时，在不同的实验条件下，测量和参考颗粒的尺寸之间观察到一个很好的协议。测量直径与参考直径之间的平均相对误差大多在12%以内。
Acoustic emission (AE) methods have been proposed for on-line size measurement of pneumatically conveyed particles in recent years. However, there is limited research on the fundamental mechanism of the AE-based particle sizing technique. In order to achieve more accurate measurement of particle size, the impact between particles and a waveguide should be described in a more realistic way. In this paper, an improved model based on the Stronge impact theory is presented to establish the relationship between the resulting AE signal and the particle size being measured. The improved model is validated with experiments on a single-particle test rig. A total five sets of glass beads with a mean diameter of 0.4, 0.6, 0.8, 1.0 and 1.2 mm, respectively, are used as the test particles with an impact velocity ranging from 22 m/s to 37 m/s. It is proven that the Stronge impact theory is more accurate to describe the collision process than the Hertzian impact theory and is thus more suitable for the particle size inversion, which is validated by comparing the inversion results using these two impact theories. Meanwhile, a good agreement is observed between the measured and reference particle sizes under different experimental conditions. The mean relative error between the measured and reference diameters is mostly within 12%.