【摘要】 采用水冷压缩式CO₂水合物蓄冷实验台,研究了不同TBAB质量分数下CO₂水合物的相平衡特性,绘制出不同TBAB质量分数下压力随温度的变化曲线。经过分析发现:与纯水溶液相比,在相同的温度下,TBAB可以降低CO₂水合物的相平衡压力,且随着TBAB质量分数的增加,相平衡条件越趋向于低压高温,然而这种作用的幅度不断减小:当温度为282 K时,TBAB质量分数为5%,10%,15%的溶液相平衡压力分别相对于纯水溶液降低了2.1,2.8,2.9 MPa。以Chen-Guo模型为基础,提出了一个新的相平衡模型,这一模型考虑到了水的相变以及TBAB的添加生成半笼型水合物等因素,使其更接近本系统的水合物生成时的真实状态,改进后的水合物相平衡模型与实验数据的误差最高有8.03%,证明了此模型有一定的参考价值。更多还原

【Abstract】 The phase equilibria of CO₂ hydrate with different mass fractions of TBAB were investigated in water-cooled compressive cool storage test bench. The curves of temperature and pressure at different TBAB concentrations were plotted. It is found that compared with the pure water solution, TBAB can decrease the phase equilibria pressure of CO₂ hydrate under the same temperature. And with the increase of TBAB mass fraction, phase equilibria conditions migrates to lower pressure and higher temperature, but the magnitude of the effect is diminishing: when the temperature is 282 K, the equilibria pressure of the solution at the TBAB mass fraction of 5%, 10% and 15% decreased by 2.1, 2.8 and 2.9 MPa, respectively. Based on Chen-Guo model, a new phase equilibria model was proposed. This model took into account factors such aswater phase transition and the addition of TBAB to form semiclathrate hydrates to make it closer to the real state of hydrate formation in this system. The highest error between the improved model data and the experimental data is 8.03%, proving that this model has certain reference value.更多还原