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Experimental Research on Suppressing Premixed Methane-air Explosion by Ultrafine Particles

Author: ChengFangMing
Tutor: DengJun
School: Xi'an University of Science and Technology
Course: Safety Technology and Engineering
Keywords: Gas explosion Explosion suppression Suppressant Ultrafine particles
CLC: TD712.7
Type: Master's thesis
Year: 2008
Downloads: 203
Quote: 3
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Abstract


Gas explosion, one of the most serious mine disasters, are serious endangering the lives of mining workers, and restraining the mining production. The complex underground work environment and the randomness of accidents bring about great difficulties to accident prevention, and therefore it is very necessary to control accidents with effective technologies, especially controlling gas explosion which will cause serious consequences and is less easily preventable has practical significance. At present, there is not any technique which can efficiently stop the gas explosion whether three explosion elements have been met. So it is greatly important to research and develop the new explosion suppressant for gas explosion disaster prevention and mitigation.Based on the mechanism of powder suppressing explosion and some basic properties of explosion suppressant, the feasibility analysis and characteristic analysis of ultrafine particles as explosion suppressant were completed, and a series of experiments of powder suppressing explosion were carried out using a 20L spherical device (steel container) builded independently in this paper. Firstly, the explosion basic parameters of static and turbulent premixed methane-air were tested, to verify the feasibility of the experiment device, to show that the initial turbulence will promote gas explosion and analyse the effect of turbulence upon gas explosion to provide guidance for solving turbulence problem resulted from the powder suppressant insufflation in experiments of powder suppressing explosion; Secondly, the effect of ultrafine silicon dioxide and diatomite powder suppressing gas explosion was measured and compared with the method using explosion property parameters tested as characterization of suppressant effectiveness and efficiency, and researched the law of the effect of suppressant powder nature and discharge process factors upon explosion suppression effect .The results of this research show that the ultrafine powder in which primary component is silicon dioxide is effective for explosion prevention and initial explosion suppression. The explosion suppression effect of nometer silicon dioxide and micron diatomite is more obvious than micron silicon dioxide, and the effect of nanometer silicon dioxide is the best. After insufflating ultrafine powder, the explosion limit scope of metha turns narrow, and explosion pressure reduces , but the effect is clear when the powder density proper in reaction container and only during the fixed period of time. The built experiment system of powder suppressing explosion and related experiments provide guidance for the design of suppressant powder discharge process and optimizing effectiveness of suppressant, and lay a foundation for the development of the ultrafine powder suppressant.

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CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine atmosphere > Mine Gas > Prevention and treatment of gas explosion
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