超声波对CO2水合物生成过程的影响

CO2捕集、利用与封存（carbon capture utilization and storage, CCUS）是控制温室气体排放的重要途径之一，是实现碳达峰、碳中和目标的重要举措。为研究超声波对水合物法捕集CO2的作用效果，搭建了一套高压条件下超声波作用于CO2水合物生成实验装置。实验过程中超声参数设置为功率比70%、总作用时间8 min、每次作用时间8.0 s、间隙时间4.5 s。结果表明：超声可以大大促进CO2水合物的生成，其原因可能是超声能够增大气液界面传质系数、溶液过饱和度以及对溶液产生扰动并不断更新反应面积；在超声作用下，CO2水合物生长前期存在一个快速反应阶段，该阶段持续时间与驱动力成正比；此外，CO2水合物生成量和生长速率都与驱动力成正相关。

Effects of Ultrasonic on CO2 Hydrate Formation

Carbon capture utilization and storage (CCUS) is one of the important ways to control greenhouse gas emissions, and a crucial measure to fulfill the goal of carbon peak and carbon neutrality. In order to investigate the effect of ultrasonic on hydrate-based CO2 capture, an experimental apparatus was built for CO2 hydrate formation with ultrasonic under high pressure. In experiments, the ultrasonic power ratio, total action time, each action time and gap time were 70%, 8 min, 8.0 s and 4.5 s, respectively. The results show that the CO2 hydrate formation can be improved effectively by ultrasonic. It might be due to the increased mass transfer coefficient at gas-liquid interface and solution supersaturation by ultrasonic, and the solution can be continuously disturbed to renew the reaction area. In ultrasonic field, there is a rapid reaction stage in the early growth of CO2 hydrate, which is proportional to the driving force. In addition, the growth rate and production of CO2 hydrate are positively correlated with the driving force.