可燃物化学性质对燃烧释放PM<sub>2.5</sub>元素成分的影响

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Abstract We simulated the flaming and smoldering combustion process of different organs (branches, leaves and barks) of six typical tree species in Yunnan Province based on a self-designed combustion apparatus. The emitted particulate matters (PM_2.5) were collected, and the emission factors of eight elements (K, Mg, etc) were measured and calculated. On this basis, the differences of element content in PM_2.5 between different combustion states were compared, and the correlations between element emission factors and element content in the fuel were analyzed. The results showed that the contents of K, Mg and Ca in the fuel were high, range of (137.74~4670.70) mg/kg, and the trace element Mn was prominent. The element content of broad-leaved species was generally higher than that in conifers, and significant differences were found among the element content from different organs. The PM_2.5 emission factors of major elements were higher than those of trace elements, K and Na were high in major elements, range of (0.4269~4.9321)~(0.6311~3.0856) mg/kg, Zn and Cu were respectively the highest and lowest in trace elements, range of (0.0409~0.3670)~(0.0029~0.0458) mg/kg . The element emission factors of PM_2.5 in conifers were higher than those in broad-leaved species, and the differences of element content (emission factor) among organs were large. The combustion state affected the emission factors of major elements (generally burning > smoldering). For the element content ratio (before and after combustion), Na occupied the highest ratio and proportion of residual elements was generally in the range of 0 ~ 1%. The trace elements were higher than the major elements, and conifers were higher than broad-leaved species. Chemical properties significantly affected the emission characteristics of fuel. The correlations between elements of fuel and emitted particulate matters were strong with coefficients > 0.60. The correlation levels of different elements in fuel were as follows: major elements were generally higher than trace elements, conifers were slightly higher than broad-leaved species, leaves > barks > branches, and flaming combustion was more significant than smoldering combustion.

Key words： particulate matter (PM_2.5) ecosystem different combustion states correlation level

Received: 20 October 2021

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X513

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	ZHU Zhong-pan
	GUO Yu-xuan
	WEI Mao
	ZHU He
	MA Yuan-fan
	ZHENG Wen-xia
	GUO Fu-tao

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ZHU Zhong-pan,GUO Yu-xuan,WEI Mao等. Effects of chemical properties of fuel on the composition of PM_2.5 released by combustion[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2050-2059.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2050

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