鼠李糖脂与多孔介质对天然气水合物生成影响

Effects of rhamnolipid and porous media on natural gas hydrate formation

天然气水合物在甲烷储运方面具有巨大的发展潜力。研究了生物型表面活性剂鼠李糖脂与多孔的铜和二氧化硅粒子介质在275.15 K和6 MPa的条件下对水合物生成的影响。结果表明,随着鼠李糖脂溶液浓度的增大,储气密度呈现逐渐下降的趋势,100 mg/L的鼠李糖脂溶液效果最佳,储气密度可达104.3 Vg/Vw,但具有较长的诱导时间,多孔介质的加入显著降低了水合物生成过程的诱导时间,二氧化硅颗粒中观察不到诱导期的存在,储气密度增加至106.2 Vg/Vw,而铜颗粒却降低了水合物的储气密度。因此,合理选择鼠李糖脂溶液的浓度和多孔介质的种类可提高水合物的生成速率和储气密度。

Natural gas hydrate has great potential in methane storage and transportation.The effects of biosurfactant rhamnolipid and the porous media of copper and silica particles on hydrate formation under the conditions of 275.15 K and 6 MPa were investigated.The results showed that with the increase of rhamnolipid solution concentration,the gas storage density exhibited a gradual decrease trend.The rhamnolipid solution with a concentration of 100 mg/L was determined to be the best,which obtained a gas storage density of 104.3 Vg/Vw,but having a longer induction time.The addition of porous media significantly reduced the induction time of the hydrate formation.In the system adding silica particles,no induction period was observed,and the gas storage density increased to 106.2 Vg/Vw,while in the system adding copper particles,the gas storage density decreased.Therefore,reasonable selection of the concentration of rhamnolipid solution and the type of porous media can improve the hydrate formation rate and gas storage density.