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Analysis and evaluation on pressure fluctuations in air dense medium fluidized bed

International Journal of Mining Science and Technology 2018年第3期28卷 461-467页

作者： Sheng Cheng Duan Chenlong Zhao Yuemin Dong Liang Luo Zhenfu Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education School of Chemical Engineering & Technology China University of Mining & Technology Xuzhou 221116 China Forschungszentrum Jülich Julich 52428 Germany

Pressure fluctuations contribute to the instability of separation process in air dense medium fluidized bed, which provides a high motivation for further study of underlying mechanisms. Reasons for generation and propagation of pressure fluctuations in the air dense medium fluidized bed have been *** rate and collision rate of particles were employed to deduce the correlation between voidage and pressure fluctuations. Simultaneously, a dynamic pressure fluctuation measuring and analysis system was established. Based on frequency domain analysis and wavelet analysis, collected signals were disassembled and analyzed. Results show gradually intensive motion of particles increases magnitudes of signal components with lower frequencies. As a result of violent particle motion, the magnitude of real pressure signal's frequency experienced an increase as air velocity increased moderately. Wavelet analysis keeps edge features of the real signal and eliminates the noise efficaciously. The frequency of denoised signal is closed to that of pressure signal identified in frequency domain analysis.

关键词： air dense medium fluidized bed Pressure fluctuations Frequency domain analysis Wavelet analysis Particle distribution function

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Progress in developments of dry coal beneficiation

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International Journal of Coal Science & Technology 2014年第1期1卷 103-112页

作者： Yuemin Zhao Xuliang Yang Zhenfu Luo Chenlong Duan Shulei Song School of Chemical Engineering&Technology China University of Mining&TechnologyXuzhou 221116China

China’s energy supply heavily relies on coal and China’s coal resource and water resource has a reverse *** problem of water shortages restricts the applications of wet coal beneficiation technologies in drought *** present situation highlights the significance and urgency of developing dry beneficiation technologies of ***,other countries that produce large amounts of coal also encounter serious problem of lack of water for coal beneficiation,such as American,Australia,Canada,South Africa,Turkey and ***,dry coal beneficiation becomes the research hot-points in the field of coal cleaning worldwide in recent *** paper systematically reviewed the promising research efforts on dry coal beneficiation reported in literature in last 5 years and discussed the progress in developments of dry coal beneficiation ***,we also elaborated the prospects and the challenges of the development of dry coal beneficiation.

关键词： Dry coal beneficiation air dense medium fluidized bed Density segregation Vibrated fluidized bed

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