立方型扰动硬链方程——应用于近临界流体相态行为预测

将立方型扰动硬链方程(CSPHC方程)扩展应用于流体在近临界区的相态行为预测.重新回归了十种常见的凝析气藏组份的CSPHC方程纯物质参数,对其从理想气体直至近临界点的饱和蒸汽压和液相密度的计算结果,平均相对误差分别为1.32和3.32%.对30种含近临界组份的烃-烃二元系VLE数据的预测精度,优于SRK和PR方程,与PT方程相当;对烃-硫化氢和烃-二氧化碳体系的含近临界区在内的VLE和PVT数据的计算精度优于SRK和PT方程.

Cubic Version of Perturbed Hard Chain Theory --Application to Near Critical Fluid Phase Behavior Prediction

The cubic version of the perturbed hard chain theory (CSPHCT)developed in our previous papers has been applied to the near critical fluid phase behavior prediction in this work. Three-pure-component parameters are evaluated by fitting simultaneously both vapor pressure and liquid density data for ten kinds of gas condensate components. The calculations of vapor pressure and liquid density and their average errors, over a wide range of temperature and pressurs up to the critical point,are about 1.32 and 3.32%, respectively. The VLE predicted resuits for alkane-alkane binary systems containing near critical components, are better than those of the SRX and PR equtions of state, and are equivalent to that of the PT equation of state; in terms of the VLE and ePVT calculation results of alkane-hydrogen sulfide and alkane-carbon dioxide binary systems including the near critical region, the CSPHC qution of state is superior to the SRK and PT equations of state.