Numerical Analysis of Size and Shape Distribution of Shredded Municipal Solid Waste
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Numerical Analysis of Size and Shape Distribution of Shredded Municipal Solid Waste Kazi Naznin Masato R. Nakamura Mechanical Engineering Technology. Size and Shape Distributions. Background.

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Background

Numerical Analysis of Size and Shape Distribution of Shredded Municipal Solid Waste Kazi NazninMasato R. NakamuraMechanical Engineering Technology

Size and Shape Distributions

Background

This analysis of size and shape is important for quantifying how much pre-shredding the MSW enhances the productivity of combustion process in Waste-to-energy (WTE) combustion chambers. In this research, image and cluster analyses were carried out in order to create a particle size distribution (PSiD) and particle shape distribution (PShD) of shredded MSW. These distributions can be applied to a mathematical model for developing a new combustion chamber.

The Gamma distribution is one of the common particle size distributions

fp(D) : the Gamma distribution

a : constant

D : particle size

α, β: positive parameters

Objectives

Results

  • It is more accurate than sieve analysis since each particle can be outlined and measured.

  • Not only are size distributions estimated; in addition, the shapes of particles are measured.

  • The length, width, perimeter, and area of each particle are measured from camera images.

  • Shredded MSW (experiment)

  • As collected MSW (experiment )

  • Ash (Experiment)

  • Ash (Simulation)

  • As Collected MSW (Simulation)

  • Shredded MSW (Simulation)

Methodology

  • 350 particles of MSW in Black bags from five boroughs (Manhattan, Staten Island, Brooklyn, Queens and Bronx) of New York City.

  • 210 particles of combined ash (bottom ash + fly ash) Samples collected in the Covanta Union County facility that combusts a lot of MSW collected from New York City.

  • Capturing particle images from the digital camera with color inversion

  • Outlining the shapes of particles regarding length, width, perimeter, area.

Particle Diameter (cm)

References

[1] Campbell, G., M., Webb, C. (2001). On

predicting roller milling performance Part I:

the Breakage equation. Powder Technology

115 pp. 234-242

[2] Yagi, S., Kunii, D. (15). Studies on

combustion of carbon particles in flames and

fluidized beds. In: Fifth Symposium

(International) on Combustion Reinhold,

New York, pp. 231-244

[3] Gbor, P. K. Jia, C. Q. (2004). Critical

evaluation of coupling particle size

distribution with the shrinking core model,

Chemical Engineering Science 59 pp. 1979-

1987

[4] Nakamura, M., Castaldi, M.J., and Themelis,

N.J. (2005). Measurement of Particle Size

and Shape of New York City Municipal

Solid Waste and Combustion Residues

Using Image Analysis," Proc. 16th Japan

Society of Waste Management Experts

(JSMWE) Fall Conference, pp. 1-3, Sendai,

Japan

[5] Gaur, S., and Reed, T. B. (1998). Thermal

Data for Natural and Synthetic Fuels,

Marcel Deeker, Inc


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