Effect of Voltage and Initial Temperature on Thermodynamics and Kinetics of CO 2 Hydrate Formation in an Electrostatic Spraying Reactor

The effect of electrostatic spraying on the formation of CO2 hydrate was experimentally studied. The effects of voltage (0, 0.5, 1.0, 1.5, 2.0KV) and initial temperature (285.15, 282.15, 279.15K) on the morphology, phase equilibrium temperature, induction time, rapid growth time, gas consumption, water to hydrate conversion and gas uptake rate of CO2 hydrate were analyzed. The hydrate primarily took the wall of the vessel as the nucleation site and grew from wall to the center of the reactor. The main morphological structure of CO2 hydrate were white filaments stacked in arcs, branches, and clusters. Low voltage-high initial temperature and high voltage-low initial temperature were conducive to improving the phase equilibrium temperature of hydrate. The application of voltage would prolong the induction time and shorten the rapid growth time of CO2 hydrate, and the effect would be more apparent with the increase of voltage. Lowering the initial temperature would shorten the induction time, 23 min was observed at 1.0KV and the initial temperature of 279.15K. The gas consumption and water to hydrate conversion change with voltage were in an order of 1.0>0>2.0>1.5>0.5KV at the same temperature. Only 1.0KV could enhance CO2 gas consumption, water to hydrate conversion and gas consumption rate.