Mathematical Modeling of Mixing and Flow Phenomena of Municipal Solid Waste on the Grate

Abstract:

The recovery of energy from the municipal solid wastes (MSW) is an effective process for the large-scale MSW, the mixing and flow of MSW particles on the grate impact the combustion efficiency in combustion chamber. The travel of MSW on the grate depends on the physical characteristics of the solid wastes and the grate properties. The MSW is a more complex and non-homogeneous, so it is difficult to simulate the particle motion by mathematical model based on contact theory. The MSW particle motion model based on the Markov chain of stochastic process for new type forward-reverse acting grate is built and simulated the MSW particle motion in computer by MATLAB 7 in this paper according to the full-scale experiment. The computer simulation and experimental results suggest that the degree of the forward acting grate inclining to horizontal has an effect on the flow and mixing of the MSW particles.

• Periodical: Applied Mechanics and Materials (Volume 197)
• Pages: 792-797
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.197.792
• Online since: September 2012
• Authors: Xiang Li, Yi Ke Tang, Han Wei Zhang, Lu Yang
• Keywords: Forward Acting Grate, Markov Chain, Stochastic Method, Waste Particle Motion

References

[1] Masato Nakamura, Mathematical and Physical Modeling of Mixing and Flow Phenomena of Municipal Solid Waste Particles on a Reverse Acting Grate[D], Columbia University, (2008).

[2] WU Jintao，Study on Solid Flow and Heat Transfer of Granular in Moving Beds[D]，Hangzhou：Department of Chemical Engineering Zhejiang University, (2005).

[3] M. Aoun-Habbache, M. Aoun, H. Berthiaux, V. Mizonov, An experimental method and a Markov chain model to describe axial and radial mixing in a hoop mixer[J], Powder Technology, 2002, (128): 159– 167.

DOI: 10.1016/s0032-5910(02)00193-6

[4] Heidenreich C. A., Yan H. M., Zhang D. K., Mathematical modeling of pyrolysis of large coal particles-estimation of kinetic[J], Fuel, 1998, 78, 557-556.

DOI: 10.1016/s0016-2361(98)00166-5

[5] Hwang C. L., Hogg R., Diffusive mixing in flowing powders[J], Power Technology, 1980, 26(1), 93-101.

DOI: 10.1016/0032-5910(80)85011-x

[6] Peter B., Dziugys A., Hunsinger, et al, An approach to qualify the intensity of mixing on a forward acting grate[J], Chemical Engineering Science, 2005, 60(6), 1649-1659.

DOI: 10.1016/j.ces.2004.11.004

[7] Nakamura M., Castaldi M. J., Themelis N. J., A 2-dimensional stochastic modeling for municipal solid waste(MSW) partical mixing within a waste-to-engergy(WTE) combustion bed[R], Internation Journal of Thermal Sciences, (2008).

DOI: 10.1016/j.ijthermalsci.2009.12.006

[8] XU Yong, SUN Qicheng, ZHANG Ling, HUANG Wenbin, Advances inDiscrete Element Methods for Particulate[J]，Beijing: Advances in Mechanics, 2003(a), 33(2): 251-260.

[9] WU Qingsong, HUMaobin, Advances on Dynamic Modeling and Experimental Studies for Granular Flow[J], Beijing: Advances in Mechanics, 2002, 32(2): 250-258.