Abstract Small-scale batch combustion of wood is a major source of fine particles, black carbon emission and polycyclic aromatic hydrocarbons in Finland. The mass and chemical compositions of batch combustion emissions are known to be highly time-dependent. In this study, the gaseous and particulate batch combustion emissions of three European wood species (beech, birch and spruce) were quantified in detail with an extensive set of online analysers, including a soot particle aerosol mass spectrometer (SP-AMS) for real-time detection of particulate chemical composition. Ignition and a new batch addition on top of glowing embers were identified as the primary low temperature events during which both particulate and gaseous organic emissions peaked. The flaming combustion created high temperature conditions and produced increased emissions of refractory black carbon (rBC) and PAHs. The residual char combustion phase was characterized by low particulate mass emission consisting mainly of alkali salts and elevated concentrations of gaseous organic emissions and CO. Overall, hardwood species (beech and birch) had the highest PM1 emissions, and the difference between the lowest average emission (spruce) and the highest (birch) was more than 3-fold. The increasing combustion chamber temperature during sequential combustion of wood batches was found to decrease the carbonaceous fraction of the PM as well as OC/EC ratio, as the result of more efficient secondary combustion.

中文翻译：

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不同木材种类小规模批量燃烧排放的时间分辨化学成分

摘要 木材的小规模批量燃烧是芬兰细颗粒物、黑碳排放和多环芳烃的主要来源。众所周知，间歇燃烧排放物的质量和化学成分与时间高度相关。在这项研究中，三种欧洲木材（山毛榉、桦木和云杉）的气体和颗粒分批燃烧排放通过一套广泛的在线分析仪进行了详细量化，包括用于实时分析的烟尘颗粒气溶胶质谱仪 (SP-AMS)。颗粒化学成分的时间检测。点火和在炽热余烬上添加新批次被确定为主要的低温事件，在此期间颗粒和气体有机排放均达到峰值。火焰燃烧产生了高温条件，并增加了难熔黑碳 (rBC) 和 PAH 的排放。残炭燃烧阶段的特点是低颗粒质量排放，主要由碱盐和高浓度的气态有机排放物和 CO 组成。总体而言，硬木树种（山毛榉和桦木）的 PM1 排放量最高，平均排放量最低（云杉）和最高的（桦木）是 3 倍以上。发现在连续燃烧木材批次期间增加燃烧室温度会降低 PM 的含碳分数以及 OC/EC 比率，这是更有效的二次燃烧的结果。残炭燃烧阶段的特点是低颗粒质量排放，主要由碱盐和高浓度的气态有机排放物和 CO 组成。总体而言，硬木树种（山毛榉和桦木）的 PM1 排放量最高，平均排放量最低（云杉）和最高的（桦木）是 3 倍以上。发现在连续燃烧木材批次期间增加燃烧室温度会降低 PM 的含碳分数以及 OC/EC 比率，这是更有效的二次燃烧的结果。残炭燃烧阶段的特点是低颗粒质量排放，主要由碱盐和高浓度的气态有机排放物和 CO 组成。总体而言，硬木树种（山毛榉和桦木）的 PM1 排放量最高，平均排放量最低（云杉）和最高的（桦木）是 3 倍以上。发现在连续燃烧木材批次期间增加燃烧室温度会降低 PM 的含碳分数以及 OC/EC 比率，这是更有效的二次燃烧的结果。最低平均排放量（云杉）和最高平均排放量（桦木）之间的差异超过 3 倍。发现在连续燃烧木材批次期间增加燃烧室温度会降低 PM 的含碳分数以及 OC/EC 比率，这是更有效的二次燃烧的结果。最低平均排放量（云杉）和最高平均排放量（桦木）之间的差异超过 3 倍。发现在连续燃烧木材批次期间增加燃烧室温度会降低 PM 的含碳分数以及 OC/EC 比率，这是更有效的二次燃烧的结果。