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选取10种乔木制备风干树枝、新鲜树枝两种类型的样品,通过自制的生物质燃烧装置模拟阴、明燃两种燃烧方式燃烧制备的树枝样品,采集排放的烟尘,并使用DRI2001A热/光分析仪测定样品中的有机碳(OC)、元素碳(EC).结果表明,风干树枝明燃排放烟尘中OC的排放因子(EFOC)、EC的排放因子(EFEC)、PM的排放因子(EFPM)均值分别为6.8、2.1、16.5g·kg-1,阴燃排放烟尘中均值分别为57.5、11.1、130.9 g·kg-1;新鲜树枝明燃排放烟尘中EFOC、EFEC、EFPM均值分别为13.6、3.3、30.5 g·kg-1,阴燃排放烟尘中均值分别为57.6、9.6、125.6 g·kg-1.树枝(风干树枝、新鲜树枝)阴燃时EFOC、EFEC、EFPM均高于明燃时,在明燃(高温度)条件下含水率与树枝燃烧时EFOC、EFEC、EFPM是呈正相关关系.树枝燃烧烟尘中OC、EC、TC(TC=OC+EC)占PM的百分比约为45%、10%、55%,乔木树枝阴燃排放烟尘中OC的质量分数高于明燃,EC的质量分数低于明燃.新鲜树枝排放烟尘中OC的质量分数高于风干树枝,EC的质量分数低于风干树枝.风干树枝明燃条件下OC/EC的均值为3.3(2.5~5.2),阴燃条件下均值为5.2(4.3~6.3);新鲜树枝明燃条件下OC/EC的均值为4.1(3.1~5.3),阴燃条件下均值为6.2(4.2~8.4),乔木树枝阴燃时OC/EC的值高于明燃,含水率高的乔木树枝(新鲜树枝)燃烧排放烟尘中OC/EC的值高于含水率低的树枝(风干树枝).风干树枝燃烧烟尘中OC、EC的相关系数为0.985,新鲜树枝燃烧烟尘中OC、EC的相关系数为0.915,含水率不同的乔木树枝(风干树枝、新鲜树枝)在不同燃烧条件下(明燃、阴燃)排放烟尘中OC与EC都具有良好的相关性.
Ten kinds of arbor were used to prepare two types of samples, air-dried branches and fresh branches. The homemade biomass burning device was used to simulate the combustion of the burned samples by two combustion modes, collecting the emitted fumes and using the DRI2001A thermal / optical analysis (OC) and elemental carbon (EC) in the samples were measured.The results showed that EF, EF, EF, EFPM, Mean values were 6.8, 2.1 and 16.5 g · kg-1 respectively, and the average values of smoldering dust emissions were 57.5, 11.1 and 130.9 g · kg-1 respectively. The mean values of EFOC, EFEC and EFPM in freshly burned litter were 13.6, 3.3, and 30.5 g · kg-1, respectively, and the average values of smoldering smoke and dust were 57.6, 9.6 and 125.6 g · kg-1 respectively.The EFOC, EFEC and EFPM of the branches (air-dried branches and fresh branches) The percentages of OC, EC, TC (TC = OC + EC) in the branch burnt soot were about 45%, and the percentage of PM was about 10% in the open burning (high temperature) %, 55%. The mass fraction of OC in smoldering tree branches was higher than that of open burning, the mass fraction of EC was lower than The mass fraction of OC in the fresh tobacco branches was higher than that of the air-dried branches, and the EC content was lower than that of the air-dried branches.The average OC / EC of air-dried branches was 3.3 (2.5-5.2) 5.2 (4.3 ~ 6.3). The mean values of OC / EC under fresh-burning conditions were 4.1 (3.1 ~ 5.3) and 6.2 The values of OC / EC in burning and high water content tree branches (fresh branches) were higher than that in branches with low moisture content (air-dried branches). The correlation coefficient of OC and EC in air-dried branches was 0.985, The correlation coefficients of OC and EC in soot were 0.915. The tree branches (air-dried branches and fresh branches) with different moisture contents had good correlation between OC and EC under different combustion conditions (light and smoldering).