煤矿瓦斯中H_2S气体的吸附特性及其对治理的影响

基于新疆和山西气煤及瘦煤对H_2S、CH_4和N_2的平衡水条件下的等温吸附实验及Langmuir模型和D-A模型对实验数据的模拟结果,来研究煤矿瓦斯中H_2S气体的吸附特性及其影响因素,并探讨其与H_2S异常矿井的治理关系。结果显示:不同于CH_4和N_2在煤中主要以微孔吸附为主(90%以上),煤中H_2S气体的微孔吸附量仅占Langmuir最大吸附量的36.26%~57.21%,平均为45.99%;气体分子本身的性质是影响煤中H_2S吸附的主要因素,尤其分子直径是影响H_2S气体V_0/V_L远小于CH_4和N2的这种现象的主要原因,也是造成微孔中H_2S气体难以解吸的主要原因;基于H_2S气体在煤中吸附解吸特征,提出应从H_2S气体分子本身入手,结合矿井煤层地质条件来治理煤矿中的硫化氢。

Adsorption characteristics of H2S in coal mine gas and their effect on H2S control in coal mines

This study was based on isothermal experiments on adsorption of H2S,CH4 and N2 under a balanced water condition for gas coal and lean coal in Xinjiang and Shanxi and simulations on the Langmuir and D-A models.The purpose was to reveal adsorption characteristics of H2 S in mine gas and their influence factors as well as the relationship with H2S in coal mines.The results show that different from CH4 and N2 adsorption characteristics which are dominated by microporous adsorption,H2 S micro-pore adsorption quantity accounts for 36.26％ ～ 57.21％ of the maximum Langmuir amount (VL),with 45.99％ on average.H2S adsorption was controlled by molecular properties to a large extent,particularly molecular diameter which decides that the micropore adsorption rate(Vo/VL) of H2S is much less than that of CH4 and N2.Based on the adsorption characteristics of H2S in micro-pores,this study suggested that H2S control in coal mines should start from H2S molecular itself and combine with geological conditions of coal seams.