盐酸对煤中甲烷吸附性能的影响特征Targeted Modification Effect of Hydrochloric Acid on Methane Adsorption in Coal
任威,张利军,乔磊
摘要(Abstract):
酸化是一种改善煤渗透性的常用化学改造方法,目前对酸化煤研究主要集中在矿物组成、孔隙结构和渗透性等方面,而对酸化煤吸附性能研究尚有不足。选择盐酸(HCl)作为改造试剂,探讨了酸化煤的孔隙和吸附演化特征。结果表明,HCl对碳酸盐矿物的溶蚀作用,导致孔隙结构的变化。HCl对大孔具有扩孔效应,表现为孔体积增大,而孔面积减小。介孔表现为扩孔和转化的双重效应,具体为孔体积和孔面积均减小。Langmuir常数表现为V_L减小而p_L增大。孔隙结构的变化进一步影响煤的吸附能力,即大孔和介孔面积的降低减少了气体的吸附位点,削弱了吸附能力。本研究从矿物成分和孔隙结构的角度阐明了HCl对吸附能力的靶向控制效应,促进煤层气的解吸,为HCl在储层改造和煤层气增产中的应用提供了理论依据。
关键词(KeyWords): 盐酸;孔隙结构;吸附常数;解吸效率;煤层气
基金项目(Foundation): 国家科技重大专项子课题“潞安矿区单一低渗煤层井上下联合开发技术集成与示范”(2016ZX05067/003)
作者(Author): 任威,张利军,乔磊
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