民用煤燃烧排放亚微米颗粒物数浓度粒径分布和排放因子

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Abstract The particle number concentration and size distribution of combustion emissions from seven types of honeycomb briquettes and eleven types of lump coal were investigated using a Scanning Mobility Particle Sizer (SMPS) in a laboratory-simulated combustion setup with a dilution channel sampling system. Emission factors for the number concentration of various particle size segments were calculated, yielding essential data for the construction of a number concentration inventory and the enhancement of effect simulations. The results indicated the following: A significant quantity of submicron particles was emitted during the combustion processes of both coal types. The number concentrations exhibited a decreasing trend with increasing particle size, notably in the nucleation and Aitken modes. However, this decreasing trend was less pronounced in the lower particle size section of the accumulation mode (100nm £ Dp £ 200nm), while the number concentration of larger particles (200nm £ Dp) gradually increased with increasing particle size. The total number concentration emission factors from the combustion of honeycomb briquettes and lump coal were determined to be 9.9×10¹⁴±5.3×10¹⁴ particles/kg and 1.4×10¹⁵±7.9×10¹⁴ particles/kg, respectively. For lump coal, the emission factors across the three modes of combustion emissions were calculated as 1.0×10¹⁵ ±5.9×10¹⁴ particles/kg, 2.8×10¹⁴±2.5×10¹⁴ particles/kg, and 6.4×10¹³±3.5×10¹³ particles/kg. Notably, the three-modal mean concentration emission factors for lump coal were 1.3, 1.9, and 1.5times higher than those for honeycomb briquettes. Furthermore, the ICRP computational model was employed to estimate the total respiratory deposition flux (RDF) ranges of 7.6×10¹² to 4.7×10¹³ particles/min for honeycomb briquettes and 5.7×10¹² to 3.3×10¹³ particles/min for lump coal. It was found that over 90% of the RDF was attributed to the nuclear mode particles when compared to Aitken mode particles in the combustion emissions of submicron particles within the respiratory tract. Additionally, the particle RDF size distribution exhibited a decreasing trend across all three regions of the respiratory tract. Overall, this study provided a comprehensive analysis of particle number concentrations, size distributions, emission factors, and inhalation exposures associated with particulate matter from civil coal combustion emissions across different particle size sections. The findings contribute valuable data and essential support for the development of numerical concentration inventories, improvements in effect simulations, and assessments of health risks.

Key words： residential coal burning aerosol number concentration size distribution emission factor inhalation exposure

Received: 30 July 2024

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	QIN Xu-jing
	KONG Shao-fei
	WU Jian
	ZHENG Shu-rui
	YAN Qin
	QI Shi-hua

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QIN Xu-jing,KONG Shao-fei,WU Jian等. Number concentration, particle size distribution and emission factors of submicron aerosols during domestic coal burning[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(2): 593-605.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I2/593

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