| 机械炼焦过程生成飞灰中多环芳烃分布特征研究 |
| 摘要点击 4154 全文点击 2165 投稿时间：2012-09-17 修订日期：2012-11-01 |
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| 中文关键词 多环芳烃 炼焦 飞灰 毒性当量 装煤 出焦 |
| 英文关键词 PAHs coking fly ash toxic equivalent factor coal charging coke pushing |
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| 中文摘要 |
| 为了明确炼焦过程生成飞灰中多环芳烃(PAHs)的污染特征,采集3个不同类型焦化厂飞灰样品,利用GC-MS对其中16种EPA优控PAHs进行了定量分析,并研究了不同飞灰中PAHs的分布特征及潜在毒性特征. 结果表明,炼焦飞灰中PAHs总量在8.17×102~5.17×103 μg·g-1之间. 炭化室高3.2 m捣固焦炉生成飞灰中PAHs含量是炭化室高6 m顶装焦炉的2倍,且同一个焦化厂装煤过程生成飞灰中PAHs含量明显高于推焦过程. 炼焦飞灰中PAHs以4环和5环为主,二者之和平均占PAHs总量的80.00%以上,且以 、苯并[a]蒽和苯并[b]荧蒽含量最高. 飞灰中PAHs的苯并[a]芘毒性当量(BaPeq)浓度范围在1.64×102~9.57×102 μg·g-1. 从致癌性角度而言,除苯并[a]芘外,二苯并[a,h]蒽对PAHs总体毒性贡献值最大,占毒性总量的15.32%,其次为苯并[a]蒽和苯并[b]荧蒽. 装煤过程BaPeq毒性当量浓度为出焦过程的5.21倍,在对炼焦装煤和出焦过程形成的飞灰再利用时应根据其各自的PAHs毒性特征考虑不同的利用方式. |
| 英文摘要 |
| In order to investigate the characteristics of polycyclic aromatic hydrocarbons (PAHs) in ashes from coking, PAHs in ashes from three coke production plants were analyzed with GC-MS, and the distribution characteristics of PAHs and potential toxicity risk were discussed. The sum of 16 EPA prior PAHs varied from 8.17×102 to 5.17×103 μg·g-1. PAH contents from the coke oven (stamp charging) with the height of 3.2 m were two times higher than those from the one (top charging) with the height of 6.0 m, and PAHs in ashes from coal charging were significantly higher than those from coke pushing in the same plant. Four-ring and five-ring PAHs were the dominant species in ashes from coking and the sum of them accounted for more than 80.00% of total PAHs. Chrysene (Chr), benzo[a]anthracene (BaA) and benzo[b]fluoranthene (BbF) were abundant in all ash samples. The content of total BaP-based toxic equivalency (BaPeq) ranged from 1.64×102 to 9.57×102 μg·g-1. From the carcinogenic point of view, besides benzo[a]pyrene (BaP), dibenz[a,h]anthracene (DbA) contributed most to the overall toxicity of PAHs, followed by BaA and BbF. BaPeq concentration from coal charging was 5.21-fold higher than that from coke pushing, indicating that different reuse ways should be considered based on their specific toxicity profiles of PAHs. |
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