| The gas hydrate formation conditions are moderate and high rate of gas storage, further study of the gas hydrate curing technology are beneficial to the prevention and control of mine gas disasters, optimize our energy structure, reducing greenhouse gas emissions. Gas hydrate rapidly nucleation and growth, efficiently separation and enrichment are the key to realize the gas hydrate curing technology in industrial application, so the study on kinetics of gas hydrates and the promoter has important scientific significance and engineering value.The coalfield complex geological conditions in our country,the concentration of CH4 is high and low in the occurrence of coal seam gas, the current dynamics research about gas hydrates more about low concentration CH4 gas, and the study about high concentrations of CH4 gas is less, so this article chooses the content of CH4 are 60% and 70% of the gas mixture as the research object, calculated the hase equilibrium pressure value of the two kinds of gas sample at 2℃ in pure water system by Chen-Guo model. On the basis of calculated value given four driving forces respectively, using the experiment device of high pressure visual mixing hydrate separation, to carry out the dynamics experiment of the two kinds of gas sample in pure water system and promoter of SDS system（100mg/L）and oil/water emulsion system（Voil:Vwater =1:1） respectively, studying the effect of driving force of induction time and growth rate and recovery rate and separation factor then analysis the influence mechanism.The experimental results in pure water system show that, gas hydrate nucleation induction time are decreased with the increase of driving forces and growth rate are increased with the increase of driving forces in systems of G1 and G2, CH4 recovery and separation factor are increased with the increase of driving forces.The experimental results in SDS promoter system show that, the hydrate nucleation induction time were decreased with the increase of driving forces and the growth rate were increased with the increase of driving forces. In the system of G1 gas sample, the CH4 recovery with the driving forces increases, the separation factor first increases then decreases with the increase of driving force. In the system of G2 gas sample, the CH4 recovery and the separation factor decreases first increases then decreases with the increase of driving force. Comparative the the system of SDS to the system of pure water, the hydrate nucleation induction time which the gas G1 and G2 in the system of SDS were far less than the system of pure water, the growth rate in the system of SDS were greater than system of pure water, and the gas hydrate separation effect were better than in the system of pure water.The oil/water emulsion system experimental results show that, the growth rate were increased with the increase of driving forces in the gas sample of G1 and G2 systems. The CH4 recovery and the separation factor decreases first increases then decreases with the increase of driving force which the gas sample of G1 and G2 system. The comparison results show that, the hydrate growth rate which the gas sample of G1 and G2 in oil/water emulsion system were greater than in pure water system, but less than SDS promoter system, the hydrate separation effect which the gas sample of G1 and G2 in oil-water emulsion system were better than in pure water system, but not as good as SDS promoter system. |
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