标题： 热力学（$p,ρ,T$）特性研究一种参考高热值天然气混合物，当加入氢气至20%（mol/mol）时 显示英文标题

标题： Thermodynamic ($p,ρ,T$) characterization of a reference high-calorific natural gas mixture when hydrogen is added up to 20 % (mol/mol)

摘要： 将氢气注入天然气管网是在逐步实现供热和供电脱碳过程中的一个替代方案。 在处理富氢天然气混合物时，通常用于天然气的参考状态方程的性能应通过使用由最低可能组成不确定性的多组分参考混合物制备的高精度实验热物理数据进行验证。 在本工作中，我们提供了11组分高热值（不含氢）天然气混合物以及通过向原始标准天然气混合物中添加（10和20）mol-%氢气制备的两种衍生富氢天然气混合物的实验密度数据。 这三个混合物根据ISO 6142-1进行重量法制备，以获得其组成的最高精度，因此可作为参考物质。 使用单沉子密度计在(250-350) K温度范围和高达20 MPa的压力下测定混合物的密度。 本工作的实验密度结果已与三种不同的天然气相关混合物参考状态方程计算的密度进行了比较：AGA8-DC92 EoS、GERG-2008 EoS以及GERG-2008 EoS的改进版本。 虽然对于不含氢的天然气混合物的实验密度数据的相对偏差始终在所考虑的三种状态方程的声称不确定度范围内，但在任何三种状态方程中，富氢天然气混合物的实验密度数据都显示出较大的偏差，尤其是在最低温度和最高压力下。 显示英文摘要

摘要： The injection of hydrogen into the natural-gas grid is an alternative during the process of a gradual decarbonization of the heat and power supply. When dealing with hydrogen-enriched natural gas mixtures, the performance of the reference equations of state habitually used for natural gas should be validated by using high-precision experimental thermophysical data from multicomponent reference mixtures prepared with the lowest possible uncertainty in composition. In this work, we present experimental density data for an 11-compound high-calorific (hydrogen-free) natural gas mixture and for two derived hydrogen-enriched natural gas mixtures prepared by adding (10 and 20) mol-% of hydrogen to the original standard natural gas mixture. The three mixtures were prepared gravimetrically according to ISO 6142-1 for maximum precision in their composition and thus qualify for reference materials. A single-sinker densimeter was used to determine the density of the mixtures from (250-350) K and up to 20 MPa. The experimental density results of this work have been compared to the densities calculated by three different reference equations of state for natural gas related mixtures: the AGA8-DC92 EoS, the GERG-2008 EoS, and an improved version of the GERG-2008 EoS. While relative deviations of the experimental density data for the hydrogen-free natural gas mixture are always within the claimed uncertainty of the three considered equations of state, larger deviations can be observed for the hydrogen-enriched natural gas mixtures from any of the three equations of state, especially for the lowest temperature and the highest pressures.