The grate systems of waste-to-energy (WTE) mass-burn combustion chambers, which historically stem from coal combustion technology, have an important role in controlling the mixing of heterogeneous MSW during the combustion process. They are designed for providing efficient flow and mixing of Municipal Solid Waste (MSW) in the combustion chamber. This study presents results from a numerical analysis for grate design and chamber operation, i.e., number of reciprocating bars and reciprocation speed that influence the degree of mixing and residence time of MSW particles. A particle-based bed model of MSW and a physical model of reverse-acting grate were used in order to quantify the mixing diffusion coefficient of MSW particles. We analyzed the particle mixing with different parameters: particle size (d = 6–22 cm diameter), reciprocation speed of moving bars (Rr = 0–90 recip./h), and number of moving bars (Nb = 1–16 bars). According to the size segregation in the particle mixing process in the MSW bed, the undersized waste particles in the MSW bed on the reverse-acting grate have a higher diffusion coefficient than those of oversized and mean size particles. Also the number of moving bars, Nb, as well as reciprocation speed, Rr, were quantitatively related to a diffusion coefficient equation for MSW particle mixing.
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19th Annual North American Waste-to-Energy Conference
May 16–18, 2011
Lancaster, Pennsylvania, USA
Conference Sponsors:
- Materials and Energy Recovery Division
ISBN:
978-0-7918-5457-0
PROCEEDINGS PAPER
Mixing and Residence Time Analysis of Municipal Solid Waste Particles by Different Numbers of Moving Bars and Reciprocation Speeds of a Grate System
Masato R. Nakamura,
Masato R. Nakamura
Columbia University, New York, NY
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Marco J. Castaldi
Marco J. Castaldi
Columbia University, New York, NY
Search for other works by this author on:
Masato R. Nakamura
Columbia University, New York, NY
Marco J. Castaldi
Columbia University, New York, NY
Paper No:
NAWTEC19-5436, pp. 35-41; 7 pages
Published Online:
August 30, 2011
Citation
Nakamura, MR, & Castaldi, MJ. "Mixing and Residence Time Analysis of Municipal Solid Waste Particles by Different Numbers of Moving Bars and Reciprocation Speeds of a Grate System." Proceedings of the 19th Annual North American Waste-to-Energy Conference. 19th Annual North American Waste-to-Energy Conference. Lancaster, Pennsylvania, USA. May 16–18, 2011. pp. 35-41. ASME. https://doi.org/10.1115/NAWTEC19-5436
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