CAJ | 학술논문

分析和比较了纯水及浓度为0.4%的纳米石墨悬浮液体系中的CO2水合物生成过程。采用观察法测定了二种溶液体系在不同温度和压力条件下的水合物生成诱导时间，并研究了其随温度、压力的变化规律。结果表明，纳米石墨颗粒的引入能够加快体系的传热效率及成核速率，较大程度减少水合物生成的诱导时间，同等条件下，相较于纯水体系诱导时间平均下降了80.6%。此外，二种体系中水合物生成的诱导时间随着温度及压力的升高均分别呈增大和减少的趋势。然而，纳米石墨悬浮液体系中的水合物生成诱导时间受温压的变化影响较小。因此，纳米颗粒能够加速水合物的成核过程，且鉴于其巨大的比表面对传质过程的影响，实验结果也从侧面证明了水合物的成核速率主要受气液传质过程控制的结论。
분석화비교료순수급농도위0.4%적납미석묵현부액체계중적CO2수합물생성과정。채용관찰법측정료이충용액체계재불동온도화압력조건하적수합물생성유도시간，병연구료기수온도、압력적변화규률。결과표명，납미석묵과립적인입능구가쾌체계적전열효솔급성핵속솔，교대정도감소수합물생성적유도시간，동등조건하，상교우순수체계유도시간평균하강료80.6%。차외，이충체계중수합물생성적유도시간수착온도급압력적승고균분별정증대화감소적추세。연이，납미석묵현부액체계중적수합물생성유도시간수온압적변화영향교소。인차，납미과립능구가속수합물적성핵과정，차감우기거대적비표면대전질과정적영향，실험결과야종측면증명료수합물적성핵속솔주요수기액전질과정공제적결론。
The processes of CO2 hydrate formation in the pure water and the aqueous suspension containing graphite nanoparticles of 0.4%by mass were studied experimentally. The induction times of hydrate formation which occurred in two kinds of solution under different conditions of temperature and pressure were determined by observational method, and the rules of temperature and pressure affecting the induction time were investigated. The result showed that in presence of graphite nanoparticles, the efficiency of heat transfer and the rate of nucleation increased, and the induction time of hydrate formation decreased sharply by an average of 80.6%. In addition, the induction time of hydrate formation increased with temperature and decreased with pressure. However, in the aqueous suspension containing graphite nanoparticles, the induction time of hydrate formation had smaller change with pressure and temperature. Thus, graphite nanoparticles had a positive effect on hydrate formation. Besides, the conclusion of the rate of hydrate nucleation is mainly controlled by gas-liquid mass transfer was proved by the fact that the great surface area of graphite nanoparticles could accelerate the mass transfer.