在氢气液化工艺中，预冷循环是重要的一环，其中混合制冷剂(mixed refrigerant，MR)预冷循环是单位能耗比较低的，故对MR性能的优化显得尤为重要。为此利用液相单相循环法搭建汽液相平衡(Vapor-liquid equilibrium，VLE)实验系统，研究了 R290+R600a+N2 三元体系的 VLE 性质，在 273。15 K～323。15 K的温度范围内，对三元混合工质R290+R600a+N2进行实验研究，并获得18组实验数据。同时使用 Peng-Pobinson-Stryjek-Vera(PRSV)状态方程结合 van der Waals(vdW)混合法则对 R290+R600a、R290+N2、R600a+N2三组二元体系的VLE文献数据进行了拟合计算，得到二元交互作用系数，拟合结果与文献数据吻合良好。以此为基础，推算该三元体系的VLE性质。最后将实验数据与计算结果对比表明，体系压力平均相对偏差AARDp为0。85％，系统组分R290、R600a和N2的气相平均绝对偏差AADy1、AADy2和AADy3分别为0。0064、0。0027和0。0063，证明实验结果数据合理可靠，可以满足工程上的应用。
Measurement of vapor liquid equilibrium for ternary refrigerant mixture R290+R600a+N2
In hydrogen liquefaction process,precooling cycle is an important link,among which the unit energy consumption of MR is relatively low,so it is particularly important to optimize the performance of MR.In this pa-per,the experimental system of VLE was built by the method of single-phase liquid phase cycle,and the prop-erties of VLE in the ternary system R290+R600a+N2 were studied.The temperature range of 273.15 K～323.15 K was used to study the ternary mixing medium R290+R600a+N2,and 18 groups of experimental data were obtained.At the same time,Peng-Pobinson-Stryjek-Vera(PRSV)equation of state combined with van der Waals(vdW)mixing rule was used to calculate the VLE properties of the ternary system.By comparing the experimental data with the calculated results,the average absolute relative deviation AARDp of the system pres-sure is 0.85％,and the average absolute deviation AADy1,AADy2 and AADy3 of the system components R290,R600a and N2 are 0.0064,0.0027 and 0.0063,respectively.
国家科技期刊平台
NSTL
万方数据
维普
