Experiment Study On Gas Explosion Suppression Based On Ferrocene In Ducts

As the improvement of mechanization level and production intensification degree,as well as the increase of mining depth, the gas concentration and emission quantity in coal mine also increased accordingly. The instantaneous gas outburst in the mining process often caused local gas accumulation, which could bring about gas explosion accident. Gas explosion accidents often cause huge property losses and casualties. With the propose of suitable for the studies of ferrocene explosion suppression,self-constructed experimental facility that based on explosion experimental scale was used to accomplish the experiment of gas explosion suppression and a series of gas explosion suppression experiments were conducted and the explosion suppression law of ferrocene was discussed.Considering experimental principle and method of gas explosion suppression by powder and in order to meet requirements of the gas explosion characteristic test and powder explosion suppression experiment, the experimental device which was suitable for experimental scale and useful for explosion suppression was set up. The sizes and structures of ferrocene and aluminum hydroxide were studied by scanning electron microscopy(SEM). The ferrocene powder has irregular filamentous structure and the aluminum hydroxide powder has regular particle shape. By means of thermogravimetric analysis, the thermal characteristics of ferrocene and aluminum hydroxide have been gotten and the gas explosion suppression mechanism of ferrocene has been analyzed.Ferrocene has weak inhibiton effect on explosion pressure and the flame propagation speed when the number of obstacles is small. Whereas, the explosion suppression effect of ferrocene gradually increases. With the increase of number of obstacles, the explosion pressure decreases by degrees and the time of flame arriving to exit of the tube increases gradually, which in turn shows that ferrocene has a more obvious explosion suppression effect on gas explosion. The explosion suppression performance of ferrocene with the increase of powder concentration at low concentration and the optimum suppression effect occurred when concentration is 80g/m3 and methane volume concentration is 9.5%. Then with the increase of powder concentration,explosion suppression performance of ferrocene decreased slightly. However, thepowder concentration has little influence on gas explosion suppression. In contrast to the maximum pressure and the time of flame arrived to exit at the action of different concentration of ferrocene and aluminum hydroxide, the ferrocene has a more obvious explosion suppression effect than aluminium hydroxide.The research findings in this paper will provide significant theoretical basis for decreasing gas explosion accident, reducing the damage degree and narrowing the scope of damage of gas explosion.