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Experimental Study on Single-Particle Combustion Characteristics of Large-Sized Wheat Straw in a Drop Tube Furnace

Author

Listed:
  • Haoteng Zhang

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310058, China)

  • Lihui Yu

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310058, China)

  • Cuina Qin

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310058, China)

  • Shuo Jiang

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310058, China)

  • Chunjiang Yu

    (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310058, China)

Abstract

Co-firing large-sized straw biomass in pulverized coal boilers is a potential pathway for carbon emission reduction in China’s thermal power plants. However, experimental data on large-sized straw combustion under pulverized coal boiler combustion conditions are critically lacking. This study selected typical large-sized wheat straw particles. Employing a two-mode experimental setup in a drop tube furnace (DTF) system simulating pulverized coal boiler conditions, we systematically investigated the combustion behavior and alkali metal release characteristics of this large-sized straw biomass, with combustion processes summarized for diverse particle types. The findings reveal asynchronous combustion progression across particle surfaces due to heterogeneous mass transfer and gas diffusion; unique behaviors distinct from denser woody biomass, including bending deformation, fiber branching, and fragmentation, occur; significant and morphology-specific deformations occur during devolatilization; fragmentation universally produces particles of varied shapes (needle-like, flaky, blocky, semi-tubular) during char combustion; and potassium release exceeds 35% after complete devolatilization and surpasses 50% at a burnout degree exceeding 80%. This work provides essential experimental data on the fundamental combustion characteristics and alkali metal release of large-sized wheat straw particles under pulverized coal boiler combustion conditions, offering engineering application guidance for the direct co-firing of large-sized flexible straw biomass in pulverized coal boilers.

Suggested Citation

  • Haoteng Zhang & Lihui Yu & Cuina Qin & Shuo Jiang & Chunjiang Yu, 2025. "Experimental Study on Single-Particle Combustion Characteristics of Large-Sized Wheat Straw in a Drop Tube Furnace," Energies, MDPI, vol. 18(15), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:3968-:d:1709418
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    References listed on IDEAS

    as
    1. Mateusz Tymoszuk & Joanna Wnorowska & Sylwester Kalisz, 2025. "Grindability Features of Torrefied Biomass," Energies, MDPI, vol. 18(7), pages 1-16, April.
    2. Sae Byul Kang & Bong Suk Sim & Jong Jin Kim, 2017. "Volume and Mass Measurement of a Burning Wood Pellet by Image Processing," Energies, MDPI, vol. 10(5), pages 1-13, May.
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