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以水合物的方式分离/储存CO2气体是一项具有挑战性的新技术。为了提高水合物的生成速率和储气密度,在小型可视化的水合物反应装置上实验研究了不同种类的添加剂对CO2水合物生成特性的影响。结果表明,实验用有机硅系列添加剂可以有效降低气—水界面的表面张力,提高水合物的生成速率。CO2水合物的生成量随着添加剂浓度的增大而增大,但当浓度高于0.1%以后,其生成量增长非常缓慢。单组分添加剂SilwetL-77效果最好,而单组分添加剂THF对CO2水合物的生成没有任何改善,但将浓度为4%的THF和1%的SilwetL-77混合后却对水合物的生成起到了显著的改善效果,12h内的气体压降可达到0.27MPa,是纯水体系的10倍之多,照片显示有大量的水合物生成。研究结果对寻找适合于CO2水合物快速生成的添加剂,为其应用于高效分离储存CO2气体技术等方面提供了指导。
Separation / storage of CO2 gas as a hydrate is a challenging new technology. In order to increase the hydrate formation rate and the gas storage density, the effect of different kinds of additives on the formation characteristics of CO2 hydrate was experimentally studied on a small visualized hydrate reactor. The experimental results show that the experimental silicone additives can effectively reduce the surface tension of the gas-water interface and increase the hydrate formation rate. The amount of CO2 hydrate increased with the concentration of additive, but its production increased very slowly when the concentration was higher than 0.1%. One-component additive, Silwet L-77, was the best, while THF, a one-component additive, did not improve the CO2 hydrate formation but mixed 4% THF and 1% Silwet L-77 to hydrate Played a significant improvement effect, gas pressure drop within 12h can reach 0.27MPa, is 10 times as much as pure water system, the photo shows a large number of hydrate formation. The results provide guidance for finding additives that are suitable for the rapid formation of CO2 hydrate and for their application in the highly efficient separation and storage of CO2 gas technology.