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Study on Explosion Index of Combustible Dust Detonated by Shock Wave

Author: BaoTao
Tutor: TanYingXin
School: University of North
Course: Safety Technology and Engineering
Keywords: Shock wave Diaphragm Dust explosion Explosion pressure The rate of explosion pressure rise
CLC: O643.22
Type: Master's thesis
Year: 2009
Downloads: 94
Quote: 2
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Abstract


Shock induced combustible dust explosion is an extremely complex physical phenomena . As a serious industrial accidents , industrial production , particularly in the coal mine production when there . Study of shock induced under conditions of dust explosion characteristics to identify factors that affect the characteristics of the explosion safety issues must be resolved to solve the coal mines and other industrial sectors have important practical significance . The transform laboratory 3.1m horizontal explosive device , shock induced coal dust explosion experiments and shock induced aluminum powder explosion experiments were carried out , the explosion law , major work and conclusions include : 1 . Calculated methane explosion maximum theoretical concentration , when the pressure to be validated by experimental determination . The experimentally measured results and theoretical calculations to compare both values ??, indicating the whole set of experimental device is stable , reliable, safe, and to further experiments . 2 the maximum pressure of the test methane , and depending on the measured pressure , is determined through theoretical calculations and experimental shock winch dust used in the material and the thickness of the diaphragm , on the diaphragm , a positive pressure testing and methane explosion test . The test results show that the withstand voltage capability of the 0.08mm thickness of the copper foil , but in the loss of more energy shockwave break the diaphragm process ; shock wave to break through the 0.05mm thickness of the copper foil loss less energy , generated shock strong. So choose 0.05mm thickness copper foil as blasting diaphragm to generate a shock wave . 3 , respectively, to change the dust concentration , dust particle size and strength of the shock , the shock-induced coal dust explosion experiments and analysis of the trend of coal dust explosion pressure . Experimental results show that the presence of a coal dust explosion desired concentration , the maximum coal dust explosion pressure at this concentration ; explosion pressure of pulverized coal with the decrease of its particle size increases ; shock strength is the stronger , the greater the pressure of coal dust explosion . 4 respectively , to change the dust concentration , the dust particle size and shape of the shock-induced aluminum powder explosion experiments , and analyze the change in trend of the explosion pressure of aluminum powder . The experimental results showed that the aluminum powder explosion pressure with the concentration increases , and when the concentration of more than 600g / m ~ 3 , the increasing trend slows and gradually leveled ; same shape as the explosion pressure of aluminum powder is increased with the size reduction and ; spherical aluminum powder explosion pressure is higher than the explosion pressure of the aluminum flake .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Burning, exploding and bursting > Explosion and blasting
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