煤火区域典型岩石对CO_2、CH_4和N_2的吸附实验研究

Experimental Study on Adsorption of Typical of Rock for CO_2、CH_4 and N_2 in Coal Fire Area

采用ISO-300型气体吸附仪,对不同温度、压强下煤田火区上覆岩石的典型温室气体吸附量进行了实验,根据实验数据讨论CO_2、CH_4和N_2的吸附规律。结果表明:温度不变时,压力增大,吸附量增加;压力不变时,温度升高,吸附量减少。页岩比砂岩吸附气体量大。吸附纯气体时,CO_2最易被吸附,CH_4次之,N_2最不易被吸附。砂岩和页岩吸附混合气体的过程中,其中某种气体的含量发生改变,对本气体的吸附有影响。强(弱)吸附质气体在混合气体中占的比例越多,吸附量越靠近强(弱)吸附质。

Using IS0-300 type gas absorption analyzer,experiments were carried out on the adsorption of typical greenhouse gas from the overlying rock coal fire area in the conditions of different temperatures and pressures. Adsorption laws of CO2 ,CH4 and N2 were dis- cussed according to the experimental data. At constant temperature,adsorption capacity increased with the increase of pressure ; at con- stant pressure, adsorption capacity decreased with the increase of temperature. Gas adsorption amount of shale was higher than that of the sandstone. When pure gas was adsorbed,the most easily adsorbed was CO2, followed by CH4, and the most difficult adsorbed was N2. During the gas mixture adsorption of sandstone and shale process, the content of which a gas was changed, the impact on the adsorp- tion of the gas has influenced. The more proportion of the strong （weak） adsorbate in the mixed gas, the adsorption amount was closer to strong （weak） adsorbate.