1. College of Forestry, Fujian Agricultural and Forestry University, Fuzhou 350002, China; 2. Collaborative Innovation Center of Soil and Water Conservation in Red Soil Region of the Cross-Strait, Fuzhou 350002, China
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 (PM2.5) 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 PM2.5 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 PM2.5 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 PM2.5 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.
朱忠盼, 郭雨萱, 魏帽, 朱贺, 马远帆, 郑文霞, 郭福涛. 可燃物化学性质对燃烧释放PM2.5元素成分的影响[J]. 中国环境科学, 2022, 42(5): 2050-2059.
ZHU Zhong-pan, GUO Yu-xuan, WEI Mao, ZHU He, MA Yuan-fan, ZHENG Wen-xia, GUO Fu-tao. Effects of chemical properties of fuel on the composition of PM2.5 released by combustion. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2050-2059.
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