SJ状态方程预测流体转换曲线的比较

Comparison of Predicting Fluid Transition Curves by SJ Equation of State

运用SJ状态方程[1],预测氮、二氧化碳、甲烷、乙烷和丙烷等流体的转换曲线,SJ状态方程给出了转换曲线低温分支的良好预测,并与文献转换曲线有较好的相吻合。此外还比较SRK、RK和vd W状态方程的转换曲线,并通过状态方程计算了上述几种流体最大转换温度和最大转换压强。从几种流体的转换曲线来看SJ、SRK和RK状态方程在一定程度上能较好描述流体转换曲线的性质。

SJ equation of state[1]is used to predict the transition curves of nitrogen,carbon dioxide,methane,ethane and propane.The SJ equation of state gives a good prediction of the low temperature branch of the transition curve,which is in good agreement with the conversion curve in literature.In addition,the conversion curves of SRK,rk and VDW equations of state are compared,and the maximum conversion temperature and pressure of the above fluids are calculated by the equation of state.From the conversion curves of several fluids,SJ,SRK and rk equations of state can better describe the properties of fluid transition curves to a certain extent.