Experiment on explosion characteristics of methane and n-heptane
1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Institute of Instrumental and Environmental Technology, Otto von Guericke University, Magdeburg 39106， Germany
Abstract：To effectively prevent gas and liquid (vapor) explosion accidents in industrial production, it is necessary to obtain explosion characteristics of relevant gases and liquids. Based on the traditional 20 L spherical explosion test apparatus, the maximum explosion pressure(pmax), the maximum explosion pressure rise rate((dp/dt)max) and the deflagration index (KG) of methane and n-heptane with different concentrations were measured and analyzed under quiescent and flowing conditions. The results show that the pmax and (dp/dt)max values of methane are increased with latter decreasing and reach the peak values at 11%concentration under both conditions. The pmax and (dp/dt)max values of n-heptane show the same rule under flowing conditions and reach the peak values at 4% concentration. The optimal explosive concentrations of two alkanes are about 11% and 4%, respectively. The pmax values of two alkanes at optimal explosive concentrations are increased slightly by about 5% to 10% under flowing conditions, and the corresponding (dp/dt)max values are significantly increased by about 4 to 5 times, which leads to large explosion energy release and high explosion reaction rate. The KG values are also increased by 4 to 5 times, resulting in high destructiveness and hazard of explosions.
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2021, Vol. 42 
