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1、 OutlineBackgroundExperimental ApparatusResults and DiscussionConclusions第1页/共10页 Background:Global WarmingVanishing IceExcess Emisson of CO2 第2页/共10页 What is CO2 Hydrate?A clathrate compoundThe framwork was formed by 46 water molecules Two small cavities and six big cavitiesCO2 is guest moleculesTh
2、e process of hydrates(CO2.nH2O)formation is described by the equation:第3页/共10页 Experimental ApparatusGas Cylinder 2.Stop Valve 3.Gas Sample Bag 4.Coolant Bath 5.Reactor 6.Stirrer 7.Gas Flowmeter 8.Data Acquisition System 8V=680ml P 20MPa T:-2030Work as a closed system第4页/共10页 CO2 Hydrate Formation w
3、ith Pure Water A to B:P and T decreaseedB to C:hydrate nucleation periodC to E:hydrate rapid growth periodTemperature and pressure trace of CO2 hydrates formation Induction timeThe supercooling degree:Tsub=Teq TTeq the equilibrium Temperature at the experimental pressureT the working temperatureThe
4、overpressure degree:Psub=P-P eq第5页/共10页 Effect of Supercooling DegreeInitial pressureNucleation periodInduction timeSupercooling degreeB3MpaAt point B14min5.8520min30min38min4.353.352.35第6页/共10页 Effect of overpressure Temperature risingInduction timeoverpressure4.63.12.216min25min第7页/共10页 Conclusion
5、sBoth supercooling and overpressure can promote the formation of CO2 hydrate.The induction time increased with the decreasing of supercooling degree and the increasing pressure.The hydrates formation process includes cool-down and gas dissolution,nucleation,rapid growth and stable periods.第8页/共10页第9页/共10页感谢您的观看！第10页/共10页