温度扰动促进CO_2水合物生成特性的实验研究

Experimental Research on CO_2 Hydrate Formation Improved by Temperature Perturbation

根据水合物相区CO2气体溶解度的双重特性,在小型实验装置上研究了温度扰动对CO2水合物生成特性的影响。结果表明,纯水体系中实施温度扰动可以有效促进水合物的快速生成,气体压降提高了30%。在含0.3%十二烷基硫酸钠(sodium dodecyl sulfate,SDS)添加剂体系中采用温度扰动的促进效果更加明显,且生成量增多,反应更彻底。反应结束时的剩余气体压力非常接近设定温度下的的相平衡压力,系统的气体压降是未扰动的2.6倍。研究还发现,选择合适的温度扰动时机能够在很大程度上进一步缩短水合物的生成时间。

The effects of temperature perturbation on carbon dioxide hydrate formation were investigated in a small scale reactor based on the dual nature of CO2 solubility in hydrate-forming regions.The results show that the hydrate formation with distilled water in a quiescent system can be improved effectively by this way,and the pressure drop is increased by 30%.The effect is quite evident with 0.3% sodium dodecyl sulfate （SDS） additive using temperature perturbation method,and large amount of hydrates are formed.The rest gas pressure is very close to the phase equilibrium value at setting temperature,and the pressure drop of CO2 gas in the reactor is about 2.6 times of that without temperature perturbation.With appropriate operation time of temperature perturbation,hydrates formation period can be greatly reduced.