Emission factors and particulate matter size distribution of polycyclic aromatic hydrocarbons from residential coal combustions in rural Northern China.
Emission factors and particulate matter size distribution of polycyclic aromatic hydrocarbons from residential coal combustions in rural Northern China.
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DOI：
10.1016/j.atmosenv.2010.08.042
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发表时间：
2010-12-01
影响因子：
5
通讯作者：
Tao, Shu
中科院分区：
文献类型：
--
作者：
Shen, Guofeng;Wang, Wei;Yang, Yifeng;Zhu, Chen;Min, Yujia;Xue, Miao;Ding, Junnan;Li, Wei;Wang, Bin;Shen, Huizhong;Wang, Rong;Wang, Xilong;Tao, Shu
煤炭消费是能源生产的重要贡献者之一，被认为是对人类健康和气候变化有相当大影响的最重要的空气污染物来源之一。在典型炉膛内对煤燃烧过程中多环芳烃(PAHs)的排放进行了研究。16种EPA优先的多环芳烃的排放因子范围为6.2 5±1.16 mg kg−1(无烟煤)至2 5 3±170 mg kg−1(烟煤)，NAP和Phe分别以气相和颗粒相为主。煤样中颗粒相多环芳烃的粒度分布表明，它们大多与颗粒物(PM)有关，粒径在0.72.1μm之间或小于0.4μm(PM0.4)。在后一类中，PM0.4中不仅存在较多的多环芳烃，而且还含有较高比例的高相对分子质量多环芳烃。总体而言，总颗粒物相多环芳烃中有89%以上与PM2.5有关。居民燃煤新排放的多环芳烃的气固分配被认为主要受吸附控制，这与其他来源的多环芳烃相似。此外，利用逐步回归分析进一步研究了燃料性质和燃烧条件对多环芳烃EFS的影响，结果表明，居民燃烧时煤的水分和挥发分含量几乎可以解释PAH EFS总变化的57±10%。
Coal consumption is one important contributor to energy production, and is regarded as one of the most important sources of air pollutants that have considerable impacts on human health and climate change. Emissions of polycyclic aromatic hydrocarbons (PAHs) from coal combustion were studied in a typical stove. Emission factors (EFs) of 16 EPA priority PAHs from tested coals ranged from 6.25 ± 1.16 mg kg−1 (anthracite) to 253 ± 170 mg kg−1 (bituminous), with NAP and PHE dominated in gaseous and particulate phases, respectively. Size distributions of particulate phase PAHs from tested coals showed that they were mostly associated with particulate matter (PM) with size either between 0.7 and 2.1 μm or less than 0.4 μm (PM0.4). In the latter category, not only were more PAHs present in PM0.4, but also contained higher fractions of high molecular weight PAHs. Generally, there were more than 89% of total particulate phase PAHs associated with PM2.5. Gas-particle partitioning of freshly emitted PAHs from residential coal combustions were thought to be mainly controlled by absorption rather than adsorption, which is similar to those from other sources. Besides, the influence of fuel properties and combustion conditions was further investigated by using stepwise regression analysis, which indicated that almost 57 ± 10% of total variations in PAH EFs can be accounted for by moisture and volatile matter content of coal in residential combustion.
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