煤层气分离富集吸附剂抑爆隔爆性能实验研究

Research on the role of adsorbent for coal mine methane separation in explosion suppression and flameproof

针对含氧煤层气变压吸附分离过程中存在的安全问题,通过实验的方法研究了吸附剂对瓦斯气体的抑爆和隔爆特性,旨在为煤矿抽排瓦斯分离过程中的安全生产提供参考。实验以甲烷与空气的混合气及甲烷与氧气的混合气为研究对象,其中甲烷体积分数分别为10%和36%。研究结果如下:当吸附剂处于爆炸气氛的环境中,在吸附剂装填区域进行点火引爆不会发生爆炸;对不装填吸附剂的区域进行点火引爆,火焰不能通过吸附剂层传递到其他区域;压力波通过吸附剂层时出现了较大的衰减,如甲烷与氧气的混合气在大气压下引爆后,压力由起爆容器的5.5 MPa迅速衰减到了0.03 MPa。研究结果表明:吸附剂具有抑爆和隔爆的特性,可对吸附分离系统起到安全防护作用。

Abstract： For the hazardous problem existing in the separation of oxygen-bearing coal mine methane during the process of pressure swing adsorption, the role of the adsorbent in suppression of explosion and flameproof was studied experimentally. The experimental results offer a reference to the safe production of methane separating from the coal mines gas. Two samples were adopted,they were CH4/Air and CH4/O2 with the volume fraction of methane account for 10% and 36% respectively. The results show that the ignition will not cause any explosions within the filling area of adsorbent, when the adsorbent is in an explosive atmosphere. The flame generating by ignition within the non-filling ar- ea of adsorbent will not go through the layer of adsorbent to pass on to other area. And there is a sharp decline after the pressure wave went through the adsorbent layer,the pressure has dropped to 0.03 MPa from 5.5 MPa rapidly after the mixed gas of methane and oxygen exploded under the condition of atmospheric pressure. The results illustrate the adsorbent has the characteristic of explosion suppresion and suppression of explosion and flameproof, it could provide protective effects for the separation process. Key words ： activated carbon ; carbon molecular sieve ; coal mine gas ; explosion suppression ; flameproof