【作者】 李桂璇； 王军良； 陈乃安； 潘志彦；

【Author】 Li Gui-xuan;Wang Jun-liang;Chen Nai-an;Pan Zhi-yan;College of Environment, Zhejiang University of Technology;

【机构】 浙江工业大学环境学院；

【摘要】 实验采用耐高温高压微型可视石英毛细管作为平衡釜（FSCC）,结合冷热台、加压系统及拉曼光谱研究了地质封存条件下CO₂-正癸烷体系膨胀系数。实验通过在正癸烷与气相/超临界CO₂之间注入一段水柱（水封）以防止烷烃汽化,然后根据CO₂-正癸烷体系的拉曼峰高比(v_CO2/V_C-H)判断体系的相平衡情况。结果表明:CO₂-正癸烷体系的膨胀系数随温度（30～80℃）的升高而降低,随压力（3～15MPa）的增加而增加,且体系膨胀系数与其拉曼峰高比(v_CO2/v_C-H之间存在一定的相关性,通过拉曼峰高比的测定可得到不同温度压力条件下CO₂-正癸烷体系的膨胀系数。更多还原

【Abstract】 A fused silica capillary cell（FSCC）combined with heating-cooling stage,pressure generator,and Raman spectrometer has been developed to measure the volume expansion of C02-decane under geological storage conditions.And a slug of water was used to prevent the decane from evaporating.The Raman peak height ratio(v_CO2/v_C-H)was used to determine phase equilibrium of the system.The result has showed that the expansion coefficient of C02-decane system decreased with the temperature from 30 to 80 ℃,and increased as the pressure from 3 to 15 MPa.Meanwhile,there was a good correlation between the volume expansion coefficient and Raman peak height ratio(v_CO2/v_C-H)that additional volume expansion factor values could be obtained from this equation when utilizing the peak height ratio data to getting the volume expansion factor.更多还原