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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received July 25, 2008
Accepted November 18, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Flow characteristics and dynamic behavior of dense-phase pneumatic conveying of pulverized coal with variable moisture content at high pressure

Liang Cai^† Chen Xiaoping Zhao Changsui Pu Wenhao Lu Peng Fan Chunlei

School of Energy and Environment, Southeast University, Nanjing 210096, China

Liangc@seu.edu.cn

Korean Journal of Chemical Engineering, May 2009, 26(3), 867-873(7), 10.1007/s11814-009-0145-3

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Abstract

Experiments of dense-phase pneumatic conveying of pulverized coal using nitrogen were performed in an experimental test facility with the conveying pressure up to 4MPa and the solid-gas ratio up to 500 kg/m3. The influences of the total conveying differential pressure, the moisture content, the superficial velocity and the pressure on the mass flow rate and the solid-gas ratio were investigated. Shannon entropy analysis of pressure fluctuation time series was developed to reveal the flow characteristics. Based on the distribution of the Shannon entropy in the different conditions, the flow stability and the evolutional tendency of Shannon entropy in different regimes and the regime transition processes were obtained. The results indicate that the solid gas ratio and Shannon entropy rise with increase in the total conveying differential pressure. A phase diagram and Shannon entropy reveal preferable regularity with superficial velocity. Shannon entropy is different for the different flow regimes, and it can be used to identify the flow regimes._x000D_ As the moisture content increases, the mass flow rate, the pressure drop and Shannon entropy decrease. Shannon entropy rises with increase in pressure drop.

Keywords

Pneumatic Conveying High Pressure Solid-gas Ratio Shannon Entropy

References

Shen X, Xiong Y, Proc. Chin. Soc. Electr. Eng., 25, 103 (2005)
Molerus O, Powder Technol., 88(3), 309 (1996)
Wypych PW, Yi JL, Powder Technol., 129(1-3), 111 (2003)
Xiaoping C, Chunlei F, Cai L, Wenhao P, Peng L, Changsui Z, Korean J. Chem. Eng., 24(3), 499 (2007)
Namkung W, Cho M, Korean J. Chem. Eng., 19(6), 1066 (2002)
Kim J, Han GY, Korean J. Chem. Eng., 24(3), 445 (2007)
Gong X, Guo XL, Feng JH, J. Chem. Ind. Eng. Soc. Chin., 57, 640 (2006)
Laouar S, Molodtsof Y, Powder Technol., 95(2), 165 (1998)
Jama GA, Klinzing GE, Rizk F, Powder Technol., 112(1-2), 87 (2000)
van der Schaaf J, van Ommen JR, Takens F, Schouten JC, van den Bleek CM, Chem. Eng. Sci., 59(8-9), 1829 (2004)
Zhong WQ, Zhang MY, Powder Technol., 152(1-3), 52 (2005)
Hay JM, Nelson BH, Briens CL, Bergougnou MA, Chem. Eng. Sci., 50(3), 373 (1995)
Ellis N, Briens LA, Grace JR, Bi HT, Lim CJ, Chem. Eng. J., 96(1-3), 105 (2003)
Huang Z, Wang B, Li H, IEEE T. Instrum. Meas., 52, 7 (2003)
Li H, Powder Technol., 125(1), 61 (2002)
Wu HJ, Zhou FD, Wu YY, Int. J. Multiph. Flow, 27(3), 459 (2001)
Cho YJ, Kim SJ, Nam SH, Kang Y, Kim SD, Chem. Eng. Sci., 56(21-22), 6107 (2001)
Zhong WQ, Zhang MY, Powder Technol., 159(3), 121 (2005)
Wang X, Zhen L, Hang H, Chin. J. Sci. Instrum., 23, 596 (2002)
Shi L, Zhang Z, Yang R, Nucl. Power Eng. Chin., 21, 411 (2000)
Hillborn RC, Chaos and nonlinear dynamics, Oxford University Press, New York (1994)
Hong J, Shen Y, Tomita Y, Powder Technol., 84(3), 213 (1995)