A trial system of 20 L spherical stainless explosion container was used to investigate the effect of Al(OH)_3 ultrafine powder with different concentration suppressing gas explosion. The experimental results show that with the increase of the concentration of Al( OH)_3 powder, the maximum explosion pressure of methane first decreases then increases, that is, existing the best concentration of powder which can control methane explosion. When the concentration of methane is 9. 5% , the best concentration of Al(OH)_3 ultrafine powder with 1. 3 μm is about 250 g/m~3, the maximum explosion pressure, the rise speed of maximum pressure and the time from collecting pressure to arriving the maximum explosion pressure is 0. 583 Mpa, 9. 082 Mpa/s, 190 ms respectively. When the concentration of methane is 7. 0% , the best concentration is about 200 g/m~3, the maximum explosion pressure, the rise speed of maximum pressure and the time from collecting pressure to arriving the maximum explosion pressure is 0.474 Mpa, 3. 76 Mpa/s, 400 ms respectively.%采用20 L的球形不锈钢爆炸罐试验系统,考察不同浓度Al(OH)_3超细粉体抑制瓦斯爆炸的效果.实验结果表明,随着Al(OH)_3粉体浓度的增加,甲烷最大爆炸压力先减小后增大,即存在控制瓦斯爆炸的最佳的粉体浓度.当甲烷浓度为9.5%时,1.3μm超细粉体Al(OH)_3的最佳控爆浓度约为250 g/m~3,此粉体浓度下的最大爆炸压力、最大压力上升速率、到达最大爆炸压力的时间分别为0.583 MPa,9.082 MPa/s,190 ms;当甲烷浓度为7.0%时的最佳控爆浓度约为200 g/m~3,此粉体浓度下的最大爆炸压力、最大压力上升速率、到达最大爆炸压力的时间分别为0.474 MPa,3.76 MPa/s,400 ms.
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