烃露点分析在天然气标准气体制备中的应用

摘要

基于Peng-Robinson物性方程对天然气在不同组分组成条件下的烃露点进行模拟计算,并根据计算结果绘制了天然气的气液组成相平衡图.对比GB/T 5274-2008称量法制备气体标准物质中的饱和蒸汽压估算法,通过对相图中烃露点线的分析,可以准确地预测天然气在特定压力和温度条件下组分出现冷凝液化的可能性,可有效保证标气配制量值的可靠性.%Natural gas phase equilibrium diagram was drawn through analysis and simulated calculation of hydrocarbon dew point based on Peng-Robinson property equation.Compared to the saturated vapor pressure estimation suggested by GB/T 5274-2008,hydrocarbon dew point analysis of the phase could predict the liquefaction possibility accurately at certain pressure and temperature then to ensure the reliability of the standard gas mixture preparation values.