关键词: 柴油, 多孔介质, 组分变化, 风速, 挥发尺度

Abstract:

Based on the pollution characteristics of vaporizing materials in oil-contaminated field， coarse sand, fine sand and loam were collected and loaded in columns respectively firstly.Then diesel oil was spilled on porous media surface.The mass loss of oil was determined by weighing the column before and after oil volatilization on an electronic balance.The effects of wind speed, volatilization vessel diameter on oil volatilization rate and the content change of different oil components were studied.The results show that the volatilization rates of diesel oil on coarse sand, fine sand and loam increase in sequence, they go up with wind speed especially for light components and are 1—2 times higher than that in no wind condition.They are boundary-layer-regulated slightly.A binomial equation can express the relationship between volatilization coefficient and wind speed well.The effect of wind speed on the vaporization of low carbon components is obvious, while on nC16 it can be negligible.The volatilization coefficient of diesel oil increases linearly with the volatilization vessel diameter.

Key words: 柴油, 多孔介质, 组分变化, 风速, 挥发尺度