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Optimization of a downdraft furnace for rice straw-based heat generation

Author

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  • Migo-Sumagang, Maria Victoria P.
  • Van Hung, Nguyen
  • Detras, Monet Concepcion M.
  • Alfafara, Catalino G.
  • Borines, Myra G.
  • Capunitan, Jewel A.
  • Gummert, Martin

Abstract

Open-field burning, a widely used treatment and disposal method for rice straw, poses severe health and environmental problems due to the release of toxic gases and loss of significant soil nutrients. Hence, alternative techniques must be explored. In this study, the use of rice straw as feedstock for a downdraft small-scale furnace to produce heated air for paddy drying was investigated. A two-level factorial experiment was initially implemented using differently conditioned rice straw types, rice straw feed rates, and drying airflow rates. Optimization results using Response Surface Methodology (RSM) showed there is no significant difference in the drying air efficiency using either loose or baled straw. The optimum conditions found were at a rice straw feed rate of 20.67 kg h−1 and drying airflow rate of 3.03 m3 s−1, resulting in a drying air efficiency of 86.1%, and an increase in drying air temperature of 18.41 °C which was sufficient for paddy drying applications. At the optimum conditions, the average CO and NOx concentrations measured inside the dryer simulator were 76.57 and 2.93 ppm, respectively. The results of this research can be used for pilot studies in actual agricultural cooperatives, as well as provide inputs to life cycle analysis.

Suggested Citation

  • Migo-Sumagang, Maria Victoria P. & Van Hung, Nguyen & Detras, Monet Concepcion M. & Alfafara, Catalino G. & Borines, Myra G. & Capunitan, Jewel A. & Gummert, Martin, 2020. "Optimization of a downdraft furnace for rice straw-based heat generation," Renewable Energy, Elsevier, vol. 148(C), pages 953-963.
    • Handle: RePEc:eee:renene:v:148:y:2020:i:c:p:953-963
    DOI: 10.1016/j.renene.2019.11.001
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    Cited by:

    1. Maria Victoria P. Migo-Sumagang & Monet Concepcion Maguyon-Detras & Martin Gummert & Catalino G. Alfafara & Myra G. Borines & Jewel A. Capunitan & Nguyen Van Hung, 2020. "Rice-Straw-Based Heat Generation System Compared to Open-Field Burning and Soil Incorporation of Rice Straw: An Assessment of Energy, GHG Emissions, and Economic Impacts," Sustainability, MDPI, vol. 12(13), pages 1-18, July.
    2. W. A. M. A. N. Illankoon & Chiara Milanese & Alessandro Girella & Puhulwella G. Rathnasiri & K. H. M. Sudesh & Maria Medina Llamas & Maria Cristina Collivignarelli & Sabrina Sorlini, 2022. "Agricultural Biomass-Based Power Generation Potential in Sri Lanka: A Techno-Economic Analysis," Energies, MDPI, vol. 15(23), pages 1-18, November.
    3. Nishu, & Li, Chong & Chai, Meiyun & Rahman, Md. Maksudur & Li, Yingkai & Sarker, Manobendro & Liu, Ronghou, 2021. "Performance of alkali and Ni-modified ZSM-5 during catalytic pyrolysis of extracted hemicellulose from rice straw for the production of aromatic hydrocarbons," Renewable Energy, Elsevier, vol. 175(C), pages 936-951.
    4. Gu, Xinzhuang & Dai, Jianguo & Li, Haifeng & Dai, Yanjun, 2022. "Experimental and theoretical assessment of a solar assisted heat pump system for in-bin grain drying: A comprehensive case study," Renewable Energy, Elsevier, vol. 181(C), pages 426-444.
    5. Resmond L. Reaño & Victor Antonio N. de Padua & Anthony B. Halog, 2021. "Energy Efficiency and Life Cycle Assessment with System Dynamics of Electricity Production from Rice Straw Using a Combined Gasification and Internal Combustion Engine," Energies, MDPI, vol. 14(16), pages 1-19, August.

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