The main components of liquid hydrocarbon leakage evaporated gas is methane, which is not only a meanly greenhouse gas, and also a kind of dangerous substances may cause fire and explosion. Study of the mechanism of the liquid hydrocarbon leakage and evaporation will be beneficial to protect environment, prevent fire and explosion accident effectively. Based on the homemade experimental platform of liquid hydrocarbons volatilizes and diffusion, the speed of diesel oil volatile in the cup was detected with the temperature of 30°C, 60°C, 90°C and 120°C respectively, and the concentrations distribution variation of vapor cloud above the liquid level of 0.4 m, 0.8 m, 1.2 m and 1.6 m was also detected in a sealed condition. The results indicate that: diesel oil volatilization has exponent relation to diesel oil temperature; the vapor cloud density has logarithmic relation to diesel oil volatilization:; and the time of forming the explosion concentration of vapor cloud has exponent relation to diesel oil temperature:. There is a peak area of concentration at about above the liquid level of 0.8m, and achieve explosion concentration in where firstly and then expanding on both ends. This paper provided a liquid pool volatilize diffusion experiment platform which can quantitatively study the volatile speed of diesel after leakage, quantitative analysis can be vapor cloud explosion concentration distribution, and the experimental results can be used to guidance for early-warning and control the explosion disaster of liquid hydrocarbon and reduce the methane to the air pollution.
