Experimental Study on the Formation Characteristics of CO2 Hydrate in Porous Media
CO2 hydrate is considered as one of the most promising cold storage materials in the future due to its high latent heat value of 500 kJ/kg at constant low temperature.However,its high equilibrium pressure,slow formation kinetics and low thermal conductivity limit its application.In this paper,by introducing the thermodynamic accelerator tetrahydrofuran(THF),a significant effect on reducing the formation pressure of CO2 hydrate is found.When the mass fraction of THF is 0.32,the synthesis of CO2 hydrate can be achieved under temperature of-3℃ and pressure of 0.6 MPa.In addition,supporting porous media with high thermal conductivity is combined with CO2 hydrate,and results show that compared with the condition without copper foam,the average gas consumption at 20 PPI,50 PPI and 90 PPI increases by 17.7％,28.7％and 111.08％,respectively.On the one hand,increasing the pore density of copper foam can increase the production rate of CO2 hydrate and improve the normalized cold storage density of materials.On the other hand,the synthesis time can be prolonged,increasing the preparation time of the cold storage cycle,which will indirectly increase the space volume and weight of the cold storage system.
cold storagegas hydrateCO2 hydratesporous mediaexperimental research
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