煤与玉米芯共燃烧过程中多环芳烃的排放

IF 0.8 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES Proceedings of the National Academy of Sciences, India Section A: Physical Sciences Pub Date : 2023-11-24 DOI:10.1007/s40010-023-00862-8
Reginald E. Masto, Pradeep K. Verma, Ashis Mukherjee, Lal C. Ram, Joshy George, Manish Kumar, Santi G. Sahu, Pinaki Sarkar, Sanjay K. Thakur
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摘要

在中试降管炉上研究了煤与玉米芯(0、10、20、30%)共燃烧对多环芳烃(PAHs)的排放。煤燃烧时的总多环芳烃(∑PAH)排放量(气体+颗粒物)从19.4µg/m3线性增加到10%、20%和30%玉米芯混合物的31.6、39.8和42.0µg/m3。气相以低分子量多环芳烃为主;颗粒相中、高分子量多环芳烃。萘是气相中最突出的多环芳烃。在玉米芯混合物中,苯并[a]芘的排放量增加了45.9%。而玉米芯含量为20%和30%的混合物,其排放量分别下降了- 19.1%和- 87.3%。10%玉米芯混合物的毒性等效性也相对较高,而20%和30%玉米芯混合物的毒性等效性则大大降低。对于煤的燃烧,多环芳烃是通过热解过程产生的,而对于煤-玉米芯共燃烧,多环芳烃的主要生成途径是热解合成,在燃烧后期即炉底区多环芳烃含量最高。本研究表明,至少需要20%的玉米芯掺量才能达到煤共燃在减少有毒多环芳烃排放方面的有益效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Emission of Polycyclic Aromatic Hydrocarbons from Co-combustion of Coal and Corncob

The emission of polycyclic aromatic hydrocarbons (PAHs) due to coal co-combustion with corncob (0, 10, 20, and 30%) was studied through a pilot scale drop tube furnace. Total PAHs (∑PAH) emission (gas + particulate) increased linearly from 19.4 µg/m3 for coal combustion to 31.6, 39.8, and 42.0 µg/m3 for 10, 20, and 30% corncob blends, respectively. Low-molecular-weight PAHs dominated the gas phase; medium- and high-molecular-weight PAHs in the particle phase. Naphthalene is the most prominent PAH in the gas phase. Emission of benzo[a]pyrene, increased by 45.9% at 10% corncob blend. However, its emission decreased by  − 19.1% and  − 87.3% for 20 and 30% corncob blends. Toxicity equivalence was also relatively higher for the 10% corncob blend but decreased greatly at 20 and 30% blends. For coal combustion, PAHs are generated due to the pyrolysis process, whereas for coal-corncob co-combustion, pyro-synthesis is the major route of PAH formation, as the PAH content was maximum at the later stage of combustion, i.e., at the bottom zone of the furnace. This study indicated that a minimum of 20% blending of corncob is required to achieve the beneficial effect of coal co-combustion in decreasing the emission of toxic PAHs.

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CiteScore
2.60
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0.00%
发文量
37
审稿时长
>12 weeks
期刊介绍: To promote research in all the branches of Science & Technology; and disseminate the knowledge and advancements in Science & Technology
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