Particle size distributions from laboratory-scale biomass fires using fast response instruments
Particle size distributions from laboratory-scale biomass fires using fast response instruments
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DOI：
10.5194/acp-10-8065-2010
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发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
Jung, H.
中科院分区：
文献类型：
--
作者：
Hosseini, S.;Li, Q.;Jung, H.
生物质燃烧产生的颗粒大小分布是一个重要参数，因为它影响空气质量、气候模拟和健康影响。迄今为止，从先前的研究报告的颗粒尺寸分布变化不仅由于燃料的差异，而且由于实验条件的差异。本研究的目的是报告的颗粒尺寸分布的特点，在良好控制的可重复的实验室规模的生物质火灾，美国西南部的燃料，重点是查帕拉尔。位于蒙大拿州米苏拉的美国林业部森林服务局火灾科学实验室（USDA-FSL）的燃烧实验室提供了可重复的燃烧和稀释环境，非常适合测量。对于所测试的各种燃料，颗粒尺寸分布的主要模式在29至52 nm的范围内，这可归因于新鲜烟雾的稀释。比较FMPS和APS测量的质量尺寸分布，对于PM10，51-68%的颗粒质量可归因于0.5至10 μ m的颗粒。几何平均直径在有焰燃烧过程中迅速增加，在混合相和阴燃相燃烧过程中逐渐减小。大多数燃料在燃烧阶段产生单峰分布，在阴燃阶段产生强烈的生物模态分布。使用MCE（修正燃烧效率）与几何平均直径的斜率比仅使用MCE值可以更好地区分燃烧模式（燃烧、混合和阴燃）。
Particle size distribution from biomass combustion is an important parameter as it affects air quality, climate modelling and health effects. To date, particle size distributions reported from prior studies vary not only due to difference in fuels but also difference in experimental conditions. This study aims to report characteristics of particle size distributions in well controlled repeatable lab scale biomass fires for southwestern United States fuels with focus on chaparral. The combustion laboratory at the United States Department of Agriculture-Forest Service's Fire Science Laboratory (USDA-FSL), Missoula, MT provided a repeatable combustion and dilution environment ideal for measurements. For a variety of fuels tested the major mode of particle size distribution was in the range of 29 to 52 nm, which is attributable to dilution of the fresh smoke. Comparing mass size distribution from FMPS and APS measurement 51-68% of particle mass was attributable to the particles ranging from 0.5 to 10 mu m for PM10. Geometric mean diameter rapidly increased during flaming and gradually decreased during mixed and smoldering phase combustion. Most fuels produced a unimodal distribution during flaming phase and strong biomodal distribution during smoldering phase. The mode of combustion (flaming, mixed and smoldering) could be better distinguished using the slopes in MCE (Modified Combustion Efficiency) vs. geometric mean diameter than only using MCE values.