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Process Optimization of Pellet Manufacturing from Mixed Materials in Ultrasonic Vibration-Assisted Pelleting

Author

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  • Wentao Li

    (College of Engineering, Heilongjiang Bayi Agricultural University, Daqing 163319, China)

  • Rongwei Yu

    (College of Engineering, Heilongjiang Bayi Agricultural University, Daqing 163319, China)

  • Lina Luo

    (Department of New Energy Science and Engineering, School of Engineering, Northeast Agricultural University, Harbin 150030, China)

  • Hongying Shi

    (Heilongjiang Boneng Ecological Environmental Protection Co., Ltd., Harbin 150028, China)

Abstract

Achieving carbon neutrality and alleviating the rural energy predicament are crucial aspects in rural areas, particularly in the severe cold regions of northeast China. Pellets serve as clean, renewable energy sources and are ideal alternative fuels. This study investigated the influencing factors and effects of mixed raw materials in ultrasonic vibration-assisted pelleting (UV-A pelleting). Rice straw and corn stover were mixed to produce pellets, and a central composite rotatable design (CCRD) was conducted to analyze the variables and their interactions on pellet density and durability. Mathematical regression models for pellet density and durability were established and then validated through ANOVA analysis. The results showed that all variables significantly affected the density and durability of pellets. The mixing ratio had a greater impact on pellet durability compared to density due to differences in ingredients. The optimal combination of process parameters included a mixing ratio of 25%, molding pressure of 4 MPa, pelleting time of 37 s, and ultrasonic power output at 200 W, resulting in a pellet density of 1301.18 kg/m 3 with a durability reaching 94.26%. The desirability value (0.997) under these optimal conditions confirmed the validity of the models; further experiments also verified their effectiveness. The combustion of the optimized pellet was analyzed using thermogravimetric (TG) and derivative thermogravimetric (DTG) analysis in an air atmosphere. Four combustion stages and ignition temperature were provided.

Suggested Citation

  • Wentao Li & Rongwei Yu & Lina Luo & Hongying Shi, 2024. "Process Optimization of Pellet Manufacturing from Mixed Materials in Ultrasonic Vibration-Assisted Pelleting," Energies, MDPI, vol. 17(9), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:9:p:2087-:d:1384105
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    References listed on IDEAS

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    1. Wentao Li & Mingfeng Wang & Fanbin Meng & Yifei Zhang & Bo Zhang, 2022. "A Review on the Effects of Pretreatment and Process Parameters on Properties of Pellets," Energies, MDPI, vol. 15(19), pages 1-23, October.
    2. Jakub Styks & Marek Wróbel & Jarosław Frączek & Adrian Knapczyk, 2020. "Effect of Compaction Pressure and Moisture Content on Quality Parameters of Perennial Biomass Pellets," Energies, MDPI, vol. 13(8), pages 1-20, April.
    3. Li, Yuzhou & Ning, Fuda & Cong, Weilong & Zhang, Meng & Tang, Yongjun, 2016. "Investigating pellet charring and temperature in ultrasonic vibration-assisted pelleting of wheat straw for cellulosic biofuel manufacturing," Renewable Energy, Elsevier, vol. 92(C), pages 312-320.
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