水合物法油页岩干馏气制备民用天然气研究

Research on the Preparation of Civil Natural Gas from Oil Shale Retorting Gas by the Hydration Process

利用水合物气体分离技术回收和提浓油页岩干馏气中的甲烷,使其达到民用天然气的浓度标准。通过实验室自建的水合物相平衡实验测定装置,使用恒温压力搜索法确定水合分离的最佳操作条件,并在该条件下进行了多级水合分离实验。结果表明,与传统高用量(10 wt%)促进剂四丁基溴化铵(TBAB)相比,低浓度(2 wt%)的四氢呋喃(THF)即可显著促进油页岩干馏气生成水合物,仅用四级水合分离就可使CH_(4)含量由15.2%提高到92%以上。该研究结果为油页岩干馏气的水合回收利用提供了理论依据。

Methane in retorting gas of oil shale is recovered and concentrated via the hydrate formation-based gas separation process to produce natural gas with the concentration satisfying the civil use standard.The optimum operating conditions of hydrate separation have been determined in the laboratory by the isothermal pressure search method using a self-built hydrate phase equilibrium experimental measurement system.Multi-stage hydrate separation experiments have been conducted under the found optimum conditions.The results show that compared with the traditional practice using a high dosage(10 wt%)of the accelerant tetrabutylammonium bromide(TBAB),a low concentration(2 wt%)of tetrahydrofuran(THF)is enough to significantly promote hydrate formation of oil shale retorting gas.The CH_(4) content is improved from 15.2%to above 92%just by four-stage hydrate separation.The research results have provided the theoretical basis for the hydrate formation-based recovery of oil shale retorting gas.