Biomass burning (BB), a multi-step process including drying, devolatilization, and oxidation of volatiles and char, is a globally occurring phenomenon that is understood to produce significant quantities of aerosols that have a broad range of local and global effects on humans and the environment. Quantities and properties of BB-derived aerosols are difficult to predict due to the complex nature of BB. Near-source conditions, such as oxygen availability and fuel composition, have been identified as influential factors in the properties of aerosol emissions. This work examined the total and size-resolved number and mass aerosol emission factors from dry, pulverized lignocellulosic biomass and its major constituents under laboratory burning conditions to understand the influence of oxygen level and fuel composition on near-source aerosol production. Lignocellulosic biomass and major constituents, including hemicellulose (xylan), cellulose and lignin, were pyrolyzed and combusted in inert and oxidative environments at varying oxygen levels, and the aerosol particle emissions were characterized in terms of size and quantity at a fixed dilution temperature. Fuel mass and fuel heating rate were varied to assess the sensitivity of results to these factors. A previously developed summative model to predict near-source BB aerosol emissions was also tested. Results showed that the total number and mass aerosol emissions decreased with increased oxygen levels. Nucleation mode particles dominated the number emissions in both inert and oxidative environments, but larger aerosol sizes were observed in the oxidative environment. Aerosol particle coagulation and growth were observed at larger fuel masses, indicated by a significant decrease in the total number emission factors in both inert and oxidative environments, while the total mass emission factor only slightly decreased and increased in inert and oxidative environments, respectively. The size of aerosols formed was found to positively correlate with absolute fuel consumption rate, and the effects of oxidation through combustion chemistry and thermal feedback were explored. Good agreement between the simulated and measured number emission factors for pinewood was observed in both the inert and oxidative reaction environments over the range of tested fuel masses. Simulated and measured mass emission factors showed good agreement in the oxidative environment and poorer agreement in the inert environment. Reasons for this discrepancy were explored and the importance of constituent surrogate selection is highlighted.

生物质燃烧 (BB) 是一个多步骤过程，包括挥发物和炭的干燥、脱挥发分和氧化，是一种全球性现象，据了解会产生大量气溶胶，这些气溶胶对人类和全球范围具有广泛的局部和全球影响。环境。由于 BB 的复杂性质，BB 衍生气溶胶的数量和性质难以预测。近源条件，如氧气可用性和燃料成分，已被确定为气溶胶排放特性的影响因素。这项工作检查了实验室燃烧条件下干燥、粉碎的木质纤维素生物质及其主要成分的总量和尺寸分辨数量和质量气溶胶排放因子，以了解氧气水平和燃料成分对近源气溶胶产生的影响。木质纤维素生物质和主要成分，包括半纤维素（木聚糖）、纤维素和木质素，在惰性和氧化环境中以不同的氧气水平进行热解和燃烧，并且气溶胶颗粒排放在固定稀释温度下根据大小和数量进行表征。改变燃料质量和燃料加热速率以评估结果对这些因素的敏感性。还测试了先前开发的用于预测近源 BB 气溶胶排放的总结性模型。结果表明，气溶胶排放总量和质量随着氧气含量的增加而减少。在惰性和氧化环境中，成核模式粒子在数量排放中占主导地位，但在氧化环境中观察到更大的气溶胶尺寸。在较大的燃料质量下观察到气溶胶颗粒凝结和生长，惰性环境和氧化环境中排放因子总数的显着减少表明，而总质量排放因子分别在惰性和氧化环境中仅略微减少和增加。发现形成的气溶胶的大小与绝对燃料消耗率正相关，并且通过燃烧化学和热反馈探索了氧化的影响。在测试燃料质量范围内，在惰性和氧化反应环境中观察到松木的模拟和测量数量排放因子之间的良好一致性。模拟和测量的质量排放因子在氧化环境中显示出良好的一致性，而在惰性环境中显示出较差的一致性。