Experimental Study and Theoretical Prediction of Natural Gas Hydrate Formation Conditions
Sun Zhigao¹,Fan Shuanshi²,Guo Kaihua²,Shi Lei²,Wang Ruzhu¹
(1. School of Power and Energy Engineering,Shanghai Jiaotong Unviersity,Shanghai 200030,China;2. Guangzhou Institute of Energy Conversion the Chinese Academy of Sciences Guangzhou)

Abstract: A set of highª²pressure fluid visualization and measurement system is used to measure hydrate formation conditions of methane and synthetic natural gas (mixture of methane, ethane and propane)in the temperature range of 273.58¡«288.96 K. The experimental results show that the higher the temperature, the higher the equilibrium pressure, and the greater the slope of increasing pressure is. A calculation model for gas hydrate equilibrium has been developed based on van der Waalsª²Platteeuw isotherm adsorptiontheory. The hydrates formation conditions of the experimental system are calculated based on the model. The results show that the calculation model can well de pict gas hydrate equilibrium conditions (absolute average deviations in temperature (AADT) of methane hydrate is 0.1554%, AADT of synthetic natural gas hydrate is 0.2403%).
Keywords: gas hydrate;natural gas;equilibrium;prediction