Experimental Study on Multiple Explosions during the Development and Utilization of Oil Shale Dust

Bo Liu,Yansong Zhang,Xiangbao Meng,Jinshe Chen,Yuyuan Zhang

doi:10.1155/2019/8679724

Bo Liu, Yansong Zhang + Show 3 more

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https://doi.org/10.1155/2019/8679724

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Abstract

Oil shale is a kind of high-combustion heat mineral; in the process of exploitation, storage, and utilization, oil shale dust has the risk of explosion. The explosion characteristics and flame propagation behavior of oil shale dust are worth studying. The difference between the multiple explosion behaviors of oil shale dust was investigated with the use of a 20 L explosive spherical tank and a dust MIE experimental device. The explosion characteristics and microstructure changes of the explosive products in multiple explosions were examined. The experimental results show that the maximum explosion pressure (Pmax) dropped, and simultaneously, the minimum ignition energy (MIE), the explosion time (t), and the maximum rate of pressure rise (dp/dtmax) increased as the explosions continued. Furthermore, the oil shale continued exploding until the third explosion. Some original oil shale dust (OOSD) and explosive residues were analyzed using a scanning electron microscope (SEM) and Fourier transform infrared (FT-IR) spectrometer. The SEM images of the explosive residues indicate a high fragmentation degree and well-developed pore structure during the entire multiexplosion process. Oxygen-containing functional groups, the aliphatic C-H bond, and the aromatic C-H bond in oil shale dust all participated in the oil shale dust explosion process.

Highlights

Fossil fuel is the main energy used in modern industry
An Analysis of the Experimental Results in the 20 L Explosive Spherical Tank. e explosion characteristics of oil shale dust with a particle size of under 75 μm were examined in a 20 L explosive spherical tank, during which the concentration of oil shale dust and ignition energy was set as 1000 g/m3 and 10 kJ, respectively. e residues after each explosion were collected for the explosion experiment under the same conditions. e results show that, after three explosions, the residue of oil shale dust underwent no explosion
C-O- stretching Aromatic C-H out-of-plane deformation Calcium carbonate, phosphate, and sulfate groups measured in a dust minimum ignition energy (MIE) experimental device. e measured MIE values of the original oil shale dust, the first explosive residue, and the second explosive residue were 40 mJ, 60 mJ, and 130 mJ, respectively, and the third explosive residue did not explode

Summary

Introduction

Fossil fuel is the main energy used in modern industry. As an alternative resource of oil, oil shale is more and more widely used in the world. e proven reserves of oil shale in the world are more than 400 billion [1]. Hamdan’s team, who were scholars from Jordan, experimentally investigated the minimum ignition temperatures (MIT) and minimum explosion concentrations (MEC) of oil shale dust particles with different sizes and compared the explosibility of oil shale dust with that of olive fuel dust. Having reviewed the extant literature on dust explosions, it can be concluded that scholars have mainly focused on secondary explosions in the explosion venting period, but have rarely conducted experimental simulations on the multiexplosion process of oil shale dust in an initial explosion site and have neglected the variation rules of the explosive’s ignition energy in the multiexplosion process. In this study, using the dust MIE experimental device and a 20 L explosive spherical tank, the evolution laws of the explosion characteristics and ignition energy of oil shale dust and the variations of the contents of the main chemical elements in the explosive residues were systematically evaluated. In this study, using the dust MIE experimental device and a 20 L explosive spherical tank, the evolution laws of the explosion characteristics and ignition energy of oil shale dust and the variations of the contents of the main chemical elements in the explosive residues were systematically evaluated. is research can provide insightful references for the prevention of accidents

The Experimental Methods

Results and Discussion

Conclusions