Devolatilization kinetics for the biomass fuels miscanthus, leached miscanthus, and KCl-doped pinewood were determined at high heating rates (∼10⁵ K s^–1), high peak temperatures (1405–1667 K), and short residence times (<70 ms). The particle temperature and residence time distribution were obtained from computational fluid dynamic simulations. The measured devolatilization rates, formulated in terms of single first-order reactions, were significantly faster than data reported in the literature. This difference was attributed partly to the fast heating rate/high-temperature conditions of the present study and partly to a more accurate estimate of the particle temperature. The current results indicate that neither the biomass type nor the alkali content of the biomass has a significant impact on the devolatilization rate under the investigated conditions. The development in the particle morphology was studied by electron microscopy as each fuel underwent partial to full conversion. The char yields ranged from 0.02 (leached miscanthus) to 0.11 (KCl-doped pinewood), indicating that even during fast heating, the biomass alkali content promotes char formation.

中文翻译：

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粉状生物质燃料的高升温速率脱挥发分动力学

在高加热速率下（〜10 ⁵ K s ^–1），高峰值温度（1405-1667 K）和短停留时间（<70 ms）。颗粒温度和停留时间分布是通过计算流体动力学模拟获得的。根据一次一级反应确定的测得的脱挥发分速率明显快于文献报道的数据。这种差异部分归因于本研究的快速加热速率/高温条件，部分归因于对颗粒温度的更准确估计。目前的结果表明，在所研究的条件下，生物质的类型和生物质的碱含量均对脱挥发分率没有显着影响。通过电子显微镜研究了颗粒形态的发展，因为每种燃料都经历了部分转化为完全转化。