Fault Analysis of a Dust-Removing Blower in a Sintering Plant Based on Envelope Analysis

Abstract:

Dust-removing blower is a key equipment in sintering plants, which can provide enough wind and negative pressure. It can also improve the efficiency of dust-removing. The vibration level of a dust-removing blower in a sintering plant is very high, which is beyond its normal value. Due to the complex working condition and strong background noise, it is difficult to extract fault features from the vibration signal of the dust-removing blower. Therefore, fault analysis of the blower is very difficult. Since the modulation phenomenon existed in the vibration signal of the blower is found, the envelope analysis based on the Hilbert transform is proposed to demodulate the vibration signal. The frequency spectrum of the demodulated signal shows that the first order frequency characteristic is obvious, which can effectively reveal the dynamic unbalance of the rotor system is the main reason of the abnormal vibration of the blower. According to this diagnosis, some possible reasons for the unbalance are proposed, as well as advices regarding to the repair of the blower system. Moreover, the test and analysis are conducted on the repaired blower system. The results show that the unbalance problem is eliminated and the blower can work normally, which can validate the accuracy and reliability of the proposed diagnosis method for fault analysis of the dust-removing blower.Keywords: dynamic unbalance; modulation; dust-removing blower; Hilbert Transform

• Periodical: Applied Mechanics and Materials (Volume 779)
• Pages: 145-150
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.779.145
• Online since: July 2015
• Authors: Zi Wang, Yu Dong Yang, Jing Liu*, Xiao Ping Qu, Yan Yang Zhou
• Keywords: Dust-Removing Blower, Dynamic Unbalance, Hilbert Transform, Modulation

References

[1] S. Edwards, A.W. Lees, M.I. Friswell, Identification of rotor unbalance from measured foundation response data, Proceedings of the International Modal Analysis Conference, 2(1999) 1610-1615.

[2] J.Z. Lou, H.W. Du, The research of quality imbalance fault of large rotating machinery, Modern Manufacturing Engineering, 10(2008) 23-26.

[3] X.D. Wang, X.J. Yao, Rotor unbalance load control of wind turbine based on universal model, Acta Energiae Solaris Sinica, 33(2)( 2012) 215-220.