Formation and emission characteristics of PAHs during pyrolysis and combustion of coal and biomass
发布时间：2025-10-16
点击次数：
- 发布时间：
- 2025-10-16
- 论文名称：
- Formation and emission characteristics of PAHs during pyrolysis and combustion of coal and biomass
- 发表刊物：
- FUEL
- 摘要：
- The emission of polycyclic aromatic hydrocarbons (PAHs) poses a significant risk to the ecological environment. Therefore, it is of great importance to investigate the formation characteristics of PAHs during the coal and biomass utilization. The formation of PAHs is primarily attributed to the incomplete combustion of fuels. In this work, the organic components of raw bituminous coal (BC), wheat straw (WS), and corn straw (CS) were analyzed and the formation characteristics of PAHs were explored using a fixed-bed pyrolysis system. The emission characteristics of particulate matter (PM) and PAHs were investigated in a drop-tube furnace. The results indicate that BC contains a higher proportion of aliphatic hydrocarbons, and the oxygen-containing functional groups of WS and CS are more complex. The content of PAHs in the extracts of raw BC, WS, and CS is 24.16 µg/g, 0.39 µg/g, and 0.41 µg/g, respectively. During the pyrolysis, the PAHs formation characteristics of coal are comparable to biomass. The content of PAHs in pyrolysis gas is significantly higher than that in the char. With the increase of temperature, the PAHs content in pyrolysis gas increases and then decreases, reaching a maximum value at 1000℃. At the low temperatures, the primary source of PAHs is the decomposition of the organic component of fuels. At the high temperatures, the rupture of the basic backbone and the condensation polymerization reaction are the important factors influencing PAHs emissions. The maximum PAHs emissions of BC, WS and CS are 4196.94 µg/g, 4426.78 µg/g, and 5479.50 µg/g, respectively. During the combustion, with the increase of oxygen content, the emissions of PM and PAHs gradually decrease. The proportion of low-ring PAHs increases, while the proportion of high-ring PAHs decreases. Furthermore, PM1-2.5 accounts for 52.34–84.37 % of total PM emissions. PAHs are more easily enriched in these fine particles with the proportion of 53.71–71.09 % of the total PAHs emissions.
- 合写作者：
- Zhao Xu, Yang Fuxin, Li Zhenghong, Tan Houzhang.
- 卷号：
- 378
- 是否译文：
- 否
- 发表时间：
- 2024-12-15
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