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

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. e explosion characteristics and flame propagation behavior of oil shale dust are worth studying. e 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. e explosion characteristics and microstructure changes of the explosive products in multiple explosions were examined. e experimental results show that the maximum explosion pressure (P max ) dropped, and simultaneously, the minimum ignition energy (MIE), the explosion time (t), and the maximum rate of pressure rise ((dp/dt) max ) 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. e 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.

Experimental study of explosion overpressure and flame propagation of micro‐sized and nanosized iron powder

“…In the second stage, the pressure rises and accelerates, reaching the maximum rate of pressure rise ((d P /d t ) ex ) and then the maximum explosion pressure ( P ex ). Finally, the pressure drops 16 . The increase of dust concentration has a great impact on the maximum rate of pressure rise and the maximum explosion pressure.…”

“…Finally, the pressure drops. 16 The increase of dust concentration has a great impact on the maximum rate of pressure rise and the maximum explosion pressure. At the same concentration, the burning time of nanosized iron powder is much smaller than that of micro-sized iron powder, and the (dP/dt) ex of nanosized iron powder is much larger than that of micro-sized iron powder.…”

Powder Explosion Inhibitor Prepared from Waste Incinerator Slag: Applied to Explosion Suppression of Oil Shale Dust Explosion

“…In order to study the chemical reaction forms in the process of the explosion, the types of functional groups in the pre-explosion and post-explosion dust samples were tested using a Vertex70 Fourier transform infrared spectrometer (FTIR) (Bruker). The 400-4000 cm −1 waveband of the infrared spectrum was selected [32].…”

Study on a New Type of Composite Powder Explosion Inhibitor Used to Suppress Underground Coal Dust Explosion

“…The variation of the maximum explosion pressure and maximum explosion pressure rising rate can reflect the inhibition effect of explosion inhibitor on coal dust explosion. According to the standard GB/T16425, the standard 20 L spherical explosion system was used for the explosion suppression experiment [26][27][28], as indicated in Figure 6. The test apparatus is composed of the following three parts: the main spherical tank, the control system and the data acquisition system.…”