Effect Of Static Magnetic Field On Phase Transition Characteristics Of Carbon Dioxide Hydrate

Hydrate technology is safe and free of environmental pollution,and has unique advantages.Common hydrate technology utilization methods include natural gas hydrate mining?seawater desalination?carbon dioxide capture and storage?carbon dioxide hydrate slurry cold storage.Under the natural growth environment,the hydrate growth needs to be under strict low temperature and high pressure environment,and the hydrate generation induction period is long and the growth rate is slow.The researchers found that applying an external field environment to the hydrate,such as magnetic field,ultrasound,electric field,etc.,can make the hydrate form quickly.Therefore,under the self-designed test bed,this paper studies the effect of static magnetic field on the formation and decomposition of hydrates.The experimental data is used to illustrate the effect of magnetic field on the hydrate dynamic parameters,phase equilibrium and decomposition enthalpy.The effect of magnetic field on the phase transition of carbon dioxide hydrate under different experimental systems was studied in different experimental environments.The experimental environment system includes pure water,pure water+2500GS magnetic field strength,pure water+3900GS magnetic field strength,NaCl solution+3900GS magnetic field strength,CaCl2 solution+3900GS four different experimental environment systems of magnetic field strength.Through experiments,it was found that:(1)The magnetic field promotes the formation process of carbon dioxide hydrate.Under the action of the magnetic field,the induction time of carbon dioxide hydrate is shortened,and the gas consumption and gas consumption rate increase.The greater the promoting effect of the process.(2)The magnetic field can move the phase balance of carbon dioxide hydrate to the right,and the promotion effect of the magnetic field on carbon dioxide hydrate can neutralize the inhibitory effect of salt ions on carbon dioxide hydrate.The greater the salt ion concentration,the greater the influence of the magnetic field on the phase equilibrium of carbon dioxide hydrate.(3)The magnetic field strength of 3900GS can increase the decomposition enthalpy of carbon dioxide hydrate.