纳米流体中CO_2水合物生成特性实验研究

在自行设计的小型气体水合物反应装置上进行了纳米流体中CO2水合物生成特性的实验研究,探讨了纳米粒子的种类、粒径和质量分数对CO2水合物生成特性的影响。研究发现,与纯水相比,纳米粒子Cu O和Si O2增加了CO2耗气量,但延长了气体水合物生成的诱导时间。金属纳米粒子Cu和金属氧化物纳米粒子Al2O3对CO2水合物生成的诱导时间和耗气量有明显改善。对不同粒径的Al2O3纳米粒子对气体水合物生成特性的研究发现,30 nm的Al2O3纳米流体对水合物生成特性影响最大。与纯水相比,0.1%-30 nm-Al2O3纳米流体中水合物生成的诱导时间缩短了76.9%,耗气量增加了23.2%。CO2水合物耗气量随着Cu粒子质量分数的增加先增加后减少。最后进行了纳米粒子对CO2水合物生成特性的影响的理论分析。

Experimental Study on Characteristics of CO2 Hydrate Formation in Nanofluids

The characteristics of CO2 hydrate formation in nanofluids were investigated experimentally in a small scale reaction system. The effects of type, particle size and mass fraction of nanoparticles on CO2 hydrate formation characteristics were stuided . Compared with pure water, CuO and SiO2 nanoparticles increase gas consumption, but extend induction time of gas hydrate formation. Results show that metal nanoparticle Cu and metal oxide nanoparticle Al2O3 both have a significant impact on the induction time and gas consumption of CO2 hydrate formation. Al2O3 shows a remarkable effcet on characteristics of gas hydrate formation with a particle size of 30 nm. Compared with pure water, the induction time during hydrate formation in 0.1 %-30 nm- Al2O3 nanofluid is reduced by 76.9 %, and gas consumption is increased by 23.2 %. With the increase of Cu nanoparticle mass fraction, CO2 gas consumption is first increased and then decreased. The mechanism of the effect of nanoparticles on characteristics of CO2 hydrate formation was discussed.