The increasing interest in gasification and oxy-fuel combustion of biomass has heightened the need for a detailed understanding of char gasification in industrially relevant environments (i.e., high temperature and high-heating rate). Despite innumerable studies previously conducted on gasification of biomass, very few have focused on such conditions. Consequently, in this study the high-temperature gasification behaviors of biomass-derived chars were investigated using non-intrusive techniques. Two biomass chars produced at a heating rate of approximately 10⁴ K/s were subjected to two gasification environments and one oxidation environment in an entrained flow reactor equipped with an optical particle-sizing pyrometer. A coal char produced from a common U.S. low sulfur subbituminous coal was also studied for comparison. Both char and surrounding gas temperatures were precisely measured along the centerline of the furnace. Despite differences in the physical and chemical properties of the biomass chars, they exhibited rather similar reaction temperatures under all investigated conditions. On the other hand, a slightly lower particle temperature was observed in the case of coal char gasification, suggesting a higher gasification reactivity for the coal char. A comprehensive numerical model was applied to aid the understanding of the conversion of the investigated chars under gasification atmospheres. In addition, a sensitivity analysis was performed on the influence of four parameters (gas temperature, char diameter, char density, and steam concentration) on the carbon conversion rate. The results demonstrate that the gas temperature is the most important single variable influencing the gasification rate.

对生物质的气化和含氧燃料燃烧的兴趣日益增加，这需要对与工业相关的环境（即高温和高加热速率）中的焦炭气化进行详细了解。尽管先前进行了无数关于生物质气化的研究，但很少有人关注这种条件。因此，在本研究中，使用非侵入性技术研究了生物质衍生焦炭的高温气化行为。以大约10 ⁴的加热速率生产了两种生物质炭 在配备有光学粒度筛分高温计的气流床反应器中，K / s经受两种气化环境和一种氧化环境的影响。还比较了一种由美国常见的低硫次烟煤生产的煤焦进行比较。沿炉子的中心线精确地测量了焦炭和周围气体的温度。尽管生物质炭的物理和化学性质有所不同，但它们在所有研究的条件下均表现出相当相似的反应温度。另一方面，在煤焦气化的情况下观察到稍低的颗粒温度，表明对于煤焦的更高的气化反应性。应用了一个综合的数值模型来帮助理解在气化气氛下所研究的焦炭的转化率。另外，对四个参数（气体温度，炭直径，炭密度和蒸汽浓度）对碳转化率的影响进行了敏感性分析。结果表明，气体温度是影响气化速率的最重要的单一变量。