Experimental investigation of load behaviour of an industrial scale tumbling mill using noise and vibration signature techniques
Experimental investigation of load behaviour of an industrial scale tumbling mill using noise and vibration signature techniques
复制标题
DOI：
10.1016/j.mineng.2009.07.010
复制
发表时间：
2009-12
影响因子：
4.8
通讯作者：
Gangquan Si;Hui Cao;Yanbin Zhang;Lixin Jia
中科院分区：
文献类型：
--
作者：
Gangquan Si;Hui Cao;Yanbin Zhang;Lixin Jia
粉磨负荷（即煤粉负荷水平）对提高火电厂制粉系统的生产能力和能源效率至关重要，但在工业上尚未得到有效的监测和控制。本文研究了工业规模滚轧机在实际工况下的载荷特性。安装了一个麦克风和一个加速度计，分别采集磨机噪声和进口耳轴振动信号。通过分析磨机噪声能量和振动能量的灵敏度分布，得到磨机噪声和振动的特征功率谱。然后对不同工况下磨机噪声和振动的CPS能量、质心频率和频域方差进行了研究和比较。实验结果表明，磨机噪声和磨机振动的CPS能量都能准确表征磨机负荷。此外，还可以利用磨机噪声的质心频率和频域方差来确定磨机负荷。将磨机噪声和磨机振动的这些特性结合起来，可以实现对磨机负荷的改进估计。
Mill load (i.e. the load level of coal powder), which is critical in improving the production capacity and energy efficiency of pulverizing system in thermal power plant, has not been effectively monitored and controlled industrially. This paper investigates the load behaviour in an industrial scale tumbling mill under practical working conditions. A microphone and an accelerometer were installed to pick up mill noise and inlet trunnion vibration signals, respectively. By analyzing the sensitivity distributions of mill noise energy and mill vibration energy, characteristic power spectra (CPS) of mill noise and mill vibration were obtained. The CPS energy, centroid frequency and frequency domain variance of the mill noise and mill vibration were then investigated and compared under various working conditions. Experimental results show that the CPS energy of both mill noise and mill vibration can accurately represent the mill load. Moreover, the centroid frequency and frequency domain variance of mill noise can also be used to determine mill load. By combining these characteristics of mill noise and mill vibration, an improved estimation of mill load can be achieved.