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Cao W.,Nanjing University of Science and Technology | Huang L.,Nanjing University of Science and Technology | Liang J.,Nanjing University of Science and Technology | Miao N.,Nanjing University of Science and Technology | And 3 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2014

In order to investigate the explosion parameters of coal dust in the spherical sealed container, the explosion rule and explosion mechanism of two kinds of coal dust with different volatile, ignition quality and explosion suppression agent were studied in a 20 L sphere explosion test units. The results show that the explosion pressure increased with the increasing of ignition energy. Under the same ignition quality, the explosion pressure firstly increased and then decreased. The explosion pressure of high volatile coal dust is bigger than that of low volatile coal dust. The explosion severity of coal dust with 9% methane-air mixtures is stronger than that with air mixture. Adding inert material SiO2 and NH4H2PO4 can effectively reduce coal dust explosion pressure. The explosion suppression results adding NH4H2PO4 is better than that adding SiO2. Source


Cai G.-W.,Nanjing University of Science and Technology | Xu S.,Nanjing University of Science and Technology | Xu S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | Chen X.,Shanghai Entry Exit Inspection and Quarantine Bureau | And 3 more authors.
Journal of Beijing Institute of Technology (English Edition) | Year: 2016

Using the cook-off oven, the experiment at setting heating rate of 3℃/h with different charge volume ratios studied influence of charge volume on temperature field distribution in slow cook-off oven, the results showed that the average deviations of heating rates were less than 5% basically and charge volume ratio isn't the main factors to temperature field distribution. The experiment on 64% charge volume ratio with five different heating rates explored influence of heating rates on temperature field distribution in slow cook-off oven, it could conclude that the uniformity of temperature field distribution become worse with the increase of heating rate, the average deviations were 1.8%, 3.7%, 4.6%, 8.0% and 10.4% at the heating rates of 3℃/h, 10℃/h, 60℃/h, 180℃/h and 300℃/h respectively. To ensure uniformity of temperature field distribution in the slow cook-off test oven, the heating rates need to be lower than 60℃/h. © 2016 Beijing Institute of Technology. Source


Cao W.,Nanjing University of Science and Technology | Gao W.,Dalian University of Technology | Liang J.,Nanjing University of Science and Technology | Xu S.,Nanjing University of Science and Technology | And 2 more authors.
Journal of Loss Prevention in the Process Industries | Year: 2014

To reveal the flame-propagation behavior and the thermal-radiation effects during coal-dust explosions, two coal-dust clouds were tested in a semi-enclosed vertical combustion tube. A high-speed video camera and a thermal infrared imaging device were used to record the flame-propagation process and the thermal-radiation effects of the fireball at the combustion-tube outlet. The flame propagated more quickly and with a higher temperature in the more volatile coal-dust cloud. The coal-dust concentration also significantly affected the propagation behavior of the combustion zone. When the coal-dust concentration was increased, the flame-propagation velocity and the fireball temperature increased before decreasing overall. Based on the experimental results, a dynamic model of the thermal radiation was employed to describe the changes in the fireballs quantitatively and to estimate the thermal-radiation effects during coal-dust explosions. © 2014 Elsevier Ltd. Source


Xu S.,Nanjing University of Science and Technology | Xu S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | Tan L.,Nanjing University of Science and Technology | Liu J.-P.,Nanjing University of Science and Technology | And 5 more authors.
Journal of Loss Prevention in the Process Industries | Year: 2016

Emulsion explosives (EE) have been widely used in the mining industry for their comparatively high detonation performance and exceptionally good safety characteristics. However, an accidental spontaneous burning of an emulsion explosive occurred in March 24, 2014. The investigation of the accident showed that the reaction between crystalloid sodium nitrite and ammonium nitrate (AN) was likely the cause of the spontaneous burning. To investigate the stability of the EE mixed with crystalloid sodium nitrite, AN, crystalloid Sodium nitrite, and EE, were analyzed by differential scanning calorimeter (DSC), accelerating rate calorimeter (ARC) and Dewar test. The results indicated that crystalloid sodium nitrite could decrease the onset decomposition temperature of AN and EE and the induced thermal runaway is the reason for the accident. © 2016 Elsevier Ltd. Source


Cao W.-G.,Nanjing University of Science and Technology | Xu S.,Nanjing University of Science and Technology | Xu S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | Liang J.-Y.,Nanjing University of Science and Technology | And 4 more authors.
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2014

Two kinds of different volatile pulverized coal were tested in a semi-enclosed vertical combustion tube. And a high-speed video camera and an infrared imager were used to record the flame propagation process and the spatial flame temperature distribution, respectively. The changes of the flame propagation velocity and temperature with time were analyzed for the two different coal dust clouds during combustion. Experimental results show that the flame propagation velocity and flame temperature of the high-volatile coal dust cloud are higher than those of the low-volatile coal dust cloud under the same experimental conditions. And the volumic mass of coal dust cloud as well as ignition energy can affect the flame propagation. With increasing the volumic mass of coal dust cloud, the flame propagation velocity and the flame temperature increase at first and then decrease, oscillating phenomena appear in the next process. With increasing the ignition energy, the flame propagation velocity and flame temperature increase. Based on the experimental data, an empirical formula was proposed for calculating the flame propagation velocity and flame temperature under certain conditions. ©, 2014, Explosion and Shock Waves. All right reserved. Source

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