Polycyclic aromatic hydrocarbon emission from straw burning and the influence of combustion parameters
Polycyclic aromatic hydrocarbon emission from straw burning and the influence of combustion parameters
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DOI：
10.1016/j.atmosenv.2008.10.022
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发表时间：
2009-02-01
影响因子：
5
通讯作者：
Zhu, Nah
中科院分区：
文献类型：
--
作者：
Lu, Hao;Zhu, Lizhong;Zhu, Nah
在管式炉系统中进行了燃烧模拟实验，研究了稻谷和豆秆燃烧过程中多环芳烃(PAHs)的排放规律，考察了燃烧参数对PAHs排放的影响。稻草和豆秆焚烧产生的16种多环芳烃(Sigma PAHs)的总排放量分别为9.29~23.6和3.13~49.9µg·g(-1)，在200~700℃范围内随温度升高而增加。燃烧对单项多环芳烃产量的贡献率约为80.6~100%，一般随焚烧温度的升高而增加。秸秆中的水分含量对多环芳烃的形成有负面影响，尤其是对低分子量多环芳烃的形成。豆秆含水率为30%时，西格玛多环芳烃排放量比干秸秆降低了78.2%。另外，多环芳烃的排放量随着送风中O-2含量的增加先增加后减少，在O-2含量为40%时达到最大值。建立了秸秆焚烧排放中多环芳烃的来源指纹，结果表明，在Sigma多环芳烃中，萘占35.0+/-7.4%。根据实验数据，估算出中国地区稻草和豆秆燃烧对环境空气的年排放量分别为320~357和32.5~76.0t。(C)2008爱思唯尔有限公司。保留所有权利。
A simulated burning experiment was conducted in a tubular furnace system to examine the emission of polycyclic aromatic hydrocarbons (PAHs) from the burning of rice and bean straw, and the influence of combustion parameters was investigated. Total emission amounts of 16 PAHs (Sigma PAHs) from the burning of rice and bean straw ranged from 9.29 to 23.6 mu g g(-1) and from 3.13 to 49.9 mu g g(-1), respectively, which increased with the increase of temperatures from 200 to 700 degrees C. The contribution of combustion to individual PAH yields was about 80.6-100%, which was generally increased with the increase of burning temperature. Moisture content in straw had a negative effect on PAH formation, especially on PAHs with low molecular weight. Sigma PAHs emission amounts decreased by 78.2% for bean straw with a Moisture content of 30% in comparison with that for dried straw. In addition, PAH emission amounts increased with the increase of O-2 content in supplied air and then decreased, which showed a maximum emission at O-2 content of 40%. The source fingerprint of PAHs in emission from Straw burning was established, which showed that naphthalene accounted for 35.0 +/- 7.4% of Sigma PAHs. Based on the experimental data, emission amounts of Sigma PAHs from the burning of rice and bean straw were estimated to be 320-357 and 32.5-76.0 tons to ambient air per year in China, respectively. (C) 2008 Elsevier Ltd. All rights reserved.