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实验搭建了一套高压条件下超声波作用于天然气水合物反应的装置系统,该系统中超声波的频率为20kHz,功率为0~150W可调。利用该装置研究了超声波对天然气水合物生成过程和引导时间的影响。实验发现声场中生成特征曲线诸如温度、压力、流量等随着时间的推迟与静态反应时不同,反应引导时间约缩短至静态时的1/6,分解后重新反应引导时间甚至缩短至静态的1/10。水合物成核速率提高是由于超声波提高了传质系数、成核点浓度和过饱和度,而降低了界面能。
The experiment set up a set of device system of the reaction of gas under high pressure with natural gas hydrate. The frequency of ultrasonic wave is 20kHz and the power is 0 ~ 150W. The effect of ultrasonic wave on gas hydrate generation and piloting time was studied by using this device. The experimental results show that the characteristic curves such as temperature, pressure and flow rate in the sound field are different from the static response with time delay, the lead time of the reaction is shortened to about 1/6 of the static one, and the reaction time after the decomposition is shortened to 1 / 10. The rate of hydrate nucleation increases due to the ultrasonic enhancement of the mass transfer coefficient, nucleation point concentration and supersaturation, which reduces the interfacial energy.