氧化亚氮和氧气二元组分气-液相平衡研究

Study of Gas-Liquid Equilibrium for Nitrous Oxide and Oxygen

为提高液体氧化亚氮的自增压性能,使用PR(Peng-Robinson)状态方程,求解不同百分含量、温度、压强条件下氧化亚氮和氧气的相平衡状态,得到-40~30℃下二元组分气-液相平衡数据,并与文献中的实验数据进行对比验证。结果表明:计算获得的相平衡数据与文献中的实验数据吻合程度较好,PR状态方程能较好地描述该二元组分气-液相状态;在相同的温度条件下,随着压强的升高,气相密度增大,而由于氧气的溶解度增大导致液相密度逐渐减小,-40℃时压强从1MPa增大到15 MPa,气相密度提高了28倍,液相密度从1 126kg/m3减小到767kg/m3;在一定压强条件下,与气相密度相比,液相密度受温度的影响更显著,8 MPa时气相密度从-40℃的200kg/m3升高到30℃的318kg/m3,液相密度从-40℃的1 035kg/m3减小到30℃的542kg/m3。

In order to improve the self-pressurization performance of liquid nitrous oxide,the phase equilibrium state of nitrous oxide and oxygen under the conditions of different proportion,temperature and pressure is solved by using the Peng-Robinson(PR)EOS.The gas-liquid phase equilibrium data of the binary components at-40-30℃are compared with the experimental data in the literature.The results show that the calculated data agree well with the experimental data.The PR EOS can describe the gas-liquid phase state of the binary component.The gas density increases with the increase of pressure under same temperature and the liquid density gradually decreases due to the increase of mass fraction of oxygen in the liquid.When the pressure increases from 1 MPa to 15 MPa,the gas density increases by 28 times,and the liquid density decreases from 1 126 kg/m3 to 767 kg/m3.The liquid density is more affected by temperature than the gas density under same pressure.The gas density increases from 200 kg/m3 to 318 kg/m3,and the liquid density decreases from 1 035 kg/m3 to 542 kg/m3 while the temperature increases from-40℃to 30℃at 8 MPa.