Fuel moisture content (FMC) has an essential impact on the performance of biomass combustion. FMC typically changes during the burning process; therefore, considering only the initial FMC is inadequate for understanding clean combustion and emission control. An on-line FMC monitoring method was employed by measuring relative humidity of emissions to determine the real-time effect of FMC on modified combustion efficiency (MCE) and emission factors (EFs) of pollutants from a typical top-lit updraft cookstove fueled with wood pellets. The results obtained from a complete 16-hour combustion sequence showed an overall decreasing trend of FMC, consequently increasing combustion temperature and MCE. Flaming combustion appeared in a high-power phase where the EFs of carbon monoxide (CO) and fine particulate matter (PM_2.5) decreased while real-time FMC decreased from 3.5% to 2.1% (wet basis). Smoldering combustion was generally dominant in a low-power phase where EFs of CO and nitric oxide (NO) decreased, while PM_2.5 increased with real-time FMC decreasing from 6.3% to 4.9% (wet basis). This paper can provide meaningful information for modeling biomass burning, quantifying pollutant emissions and understanding related impacts on the residential sector.

燃料水分含量 (FMC) 对生物质燃烧的性能有重要影响。FMC 通常在燃烧过程中发生变化；因此，仅考虑初始 FMC 不足以理解清洁燃烧和排放控制。通过测量排放物的相对湿度，采用在线 FMC 监测方法确定 FMC 对典型的顶光上升气流式木炉污染物的修正燃烧效率 (MCE) 和排放因子 (EFs) 的实时影响颗粒。从完整的 16 小时燃烧序列中获得的结果显示 FMC 总体呈下降趋势，因此增加了燃烧温度和 MCE。火焰燃烧出现在高功率阶段，其中一氧化碳 (CO) 和细颗粒物 (PM _2.5) 下降，而实时 FMC 从 3.5% 下降到 2.1%（湿基）。在低功率阶段，阴燃燃烧通常占主导地位，其中 CO 和一氧化氮 (NO) 的 EF 降低，而 PM _2.5增加，实时 FMC 从 6.3% 降至 4.9%（湿基）。本文可以为模拟生物质燃烧、量化污染物排放和了解对住宅部门的相关影响提供有意义的信息。