| Our country's secure producing situation of the coalmine is very grim, especially the accident of gas explosion, which would result in a large quantity of casualties and property losses, and has absorbed high attention of the government. However, there hasn't been a technology or material which can control gas explosion efficiently, when gas fill all three explosion elements. Thus, it's very important for controlling gas explosion to find better materials and new technologies.In this paper, firstly the research status of gas explosion prevention techniques and controlling materials is introduced roundly, afterward the mechanism of the gas explosion is stated systemically. With analysis of feasibility of ultrafine flame retardant controlling gas explosion, ultrafine magnesium hydroxide and aluminum hydroxide is determined to being used to experiment as explosion-control material. Based on the building of gas explosion experiment system by self, ultrafine powders of different concentration are spouted into tube of gas explosion by comminuting machine of air current and high speed photography is adopted to take seriate pictures of flame transmission after igniting the mixed gas. With these seriate pictures, we study on the characteristic of the earlier flame transmission and the effect of controlling gas explosion with ultrafine powders.The results of experiments not only demonstrate the feasibility of gas explosion experiment system, but also validate the capability and effect of controlling gas explosion with the materials that we have selected. With the ultrafine powders spouted into tube of gas explosion, the indexes, which are used to appraise the characteristic of the flame transmission, are all improved and the indexes become better with more inert powders. At the same time, the aluminum hydroxide's effect of controlling gas explosion is superior to magnesium hydroxide's. When the concentration of aluminum hydroxide is 56.781g/m~3, comparing with...
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