Study On Methane Hydration Promoted By Slurry Of N-Tetradecane

In order to solve the problem of obtaining experimental data difficultly for depressurization hydration, we designed a set of semibatch constant pressure hydration experimental setup. And in allusion to removing the hydration heat slowly in relevant references, we used the phase change material(n-tetradecane) to absorb the heat directly. Increasing the rate of heat transfer made the temperature change in1℃ in hydrator. Thus we studied the effect of slurry of n-tetradecane on methane hydration in this work.Firstly, we explored the hydration experimental conditions including the choice of n-tetradecane emulsion formula, determining the solidify point of n-tetradecane in emulsion and the melting point of n-tetradecane in slurry, choosing the stirring rate of hydration, determining the equilibrium temperature of both sides of hydrator,calibrating the gas mass flow controller and mass flow meter.Secondly, we studied the effect of experimental pressures, stirring rate, hydration time, phase change material on methane hydrate storage capacity; we also investigated the methane hydration rate characteristics and hydration induce time in slurry of solid n-tetradecane. We concluded that the existing of phase change materials made the increase of hydration rate, decease of induce time and high hydrate storage capacity.Finally, the methane hydrate thermodynamics in our experiment system were investigated. We added the activity of water in liquid phase in hydration balance equation and we used Patel-Teja equation to calculate the fugacity of methane in gas phase. What’s more, the Krichevsky-Kasarnovsy equation was used to calculate the solubility of methane in n-tetradecane at 277.15 K and the relevant solubility formula was obtained. The fugacity of water in liquid phase and in hydrate phase was calculated by the hydration balance equation and the deviation was less than 9.1%.The hydration had reached balance.