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Municipal solid waste incineration in a packed bed: A comprehensive modeling study with experimental validation

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  • Gu, Tianbao
  • Yin, Chungen
  • Ma, Wenchao
  • Chen, Guanyi

Abstract

Grate-firing technology is one of the commonly used technologies for municipal solid waste incineration, which recovers energy and largely reduces the volume of the solid wastes for landfilling. In grate-fired incinerators, the solid wastes are packed in the fuel bed on the grate, where the major heterogeneous conversion takes place. A proper modeling of the fuel conversion process in the bed not only benefits an in-depth understanding of the in-bed incineration but also facilitates the freeboard simulation. In this paper, a comprehensive model is developed to simulate solid wastes incineration in a packed bed, which advances the state-of-the-art with corrected boundary conditions, homogeneous reactions, and calculation method for pyrolysis products. The model is first validated by a simplified analytical problem. Then, the model is validated in detail by a dedicated experimental study in literature, in which the pyrolysis and gas combustion front and the subsequent char oxidation front both propagate from the bed surface to the grate due to the abundant oxygen availability in the fuel bed. The model also outperforms a latest modeling study in literature for reproducing the same experimental study. Finally, a model-based parametric study is conducted to investigate the effects of solid waste particle sizes and solid waste incineration in high-altitude areas. This paper also clearly explains the methods to transfer the packed-bed model to travelling grates and to accommodate the different waste fractions in real municipal solid waste, in order to make the model applicable to travelling grate-firing of real municipal solid wastes.

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  • Gu, Tianbao & Yin, Chungen & Ma, Wenchao & Chen, Guanyi, 2019. "Municipal solid waste incineration in a packed bed: A comprehensive modeling study with experimental validation," Applied Energy, Elsevier, vol. 247(C), pages 127-139.
    • Handle: RePEc:eee:appene:v:247:y:2019:i:c:p:127-139
    DOI: 10.1016/j.apenergy.2019.04.014
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    2. Sedighi, Mohammadreza & Padilla, Ricardo Vasquez & Alamdari, Pedram & Lake, Maree & Rose, Andrew & Izadgoshasb, Iman & Taylor, Robert A., 2020. "A novel high-temperature (>700 °C), volumetric receiver with a packed bed of transparent and absorbing spheres," Applied Energy, Elsevier, vol. 264(C).
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    4. Wang, Linzheng & Zhang, Ruizhi & Deng, Ruiqu & Liu, Zeqing & Luo, Yonghao, 2023. "Comprehensive parametric study of fixed-bed co-gasification process through Multiple Thermally Thick Particle (MTTP) model," Applied Energy, Elsevier, vol. 348(C).
    5. Vilardi, Giorgio & Verdone, Nicola, 2022. "Exergy analysis of municipal solid waste incineration processes: The use of O2-enriched air and the oxy-combustion process," Energy, Elsevier, vol. 239(PB).
    6. Hu, Chenlian & Liu, Xiao & Lu, Jie & Wang, Chi-Hwa, 2020. "Distributionally robust optimization for power trading of waste-to-energy plants under uncertainty," Applied Energy, Elsevier, vol. 276(C).
    7. Dan Cudjoe, 2023. "Energy-economics and environmental prospects of integrated waste-to-energy projects in the Beijing-Tianjin-Hebei region," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 25(11), pages 12597-12628, November.
    8. Xia, Zihong & Long, Jisheng & Yan, Shuai & Bai, Li & Du, Hailiang & Chen, Caixia, 2021. "Two-fluid simulation of moving grate waste incinerator: Comparison of 2D and 3D bed models," Energy, Elsevier, vol. 216(C).
    9. João Silva & Senhorinha Teixeira & José Teixeira, 2023. "A Review of Biomass Thermal Analysis, Kinetics and Product Distribution for Combustion Modeling: From the Micro to Macro Perspective," Energies, MDPI, vol. 16(18), pages 1-23, September.
    10. Gu, Tianbao & Fu, Zhufu & Berning, Torsten & Li, Xuantian & Yin, Chungen, 2021. "A simplified kinetic model based on a universal description for solid fuels pyrolysis: Theoretical derivation, experimental validation, and application demonstration," Energy, Elsevier, vol. 225(C).

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