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在小型水合物反应装置上对含盐体系CO2水合物的相平衡特性进行了实验研究,并探讨盐度及pH值对CO2水合物的生成和分解特性的影响。结果表明,与纯水相比,含盐体系中CO2水合物的相平衡条件要求更高,CO2水合物的稳定存在区域缩小,且盐度越大越明显;盐类物质对CO2水合物的生成有抑制作用,增加了水合物的成核诱导时间,降低了水合物的生成量;pH值较高的含盐体系不利于CO2水合物的成核和生成;CO2水合物的分解速度随着温度的升高而增大,而盐度对水合物分解的影响并不明显。
The phase equilibrium properties of CO2 hydrate containing salt system were investigated in a small hydrate reactor and the effects of salinity and pH on the formation and decomposition of CO2 hydrate were investigated. The results show that the phase equilibrium conditions of CO2 hydrate in salt-containing system are higher than those in pure water, the stable existence area of CO2 hydrate shrinks, and the salinity becomes larger and more obvious. The formation of CO2 hydrate by salts Inhibition, increase the time of nucleation induction of hydrate and reduce the formation of hydrate. The salt system with higher pH value is not conducive to the nucleation and formation of CO2 hydrate. The decomposition rate of CO2 hydrate with temperature Increased and increased, and salinity on the hydrate decomposition is not obvious.