The Study Of PvT_x Properties Of CO₂/Ar Mixtures

Increasing concentration of greenhouse gases in atmosphere caused the average global temperature rising and various environmental disaster occurred frequently, environmental issues were brought by the development of human society had attracted more attention, which had been called for solving urgently. CO2, as a main greenhouse gas, reduced its concentration in atmosphere can alleviate the influence brought by greenhouse effect efficiently and control the speed of rising global temperatures. Carbon dioxide capture and storage (CCS) is a critical technology amongst a portfolio of measures to limit climate change to a manageable level, along with improving the efficiency of energy conversion and/or utilization, and switching to renewable energy resources. However, application and development of CCS were greatly restrainted by the shortage of available accurate experimental data of CO2 mixtures. A better understanding of the thermodynamic properties of CO2 mixtures could provide a scientific basis to define a proper guideline of impure components for the CCS processes according to technical, safety, and environmental requirements.In this work, the temperature field and flow field of thermostatic bath was numerically simulated, the influence of rotating speed, vane angle of the stirrer and shield structure on three-dimensional temperature and flow field of thermostatic bath were analyzed. The best temperature and flow field distribution of thermostatic bath is obtained under the conditions of a pair stirrer with vane angle of 45°,30°,15° from top to bottom respectively, rotating speed of 1500 r/min and porosity of shield of 0.3071.A high precision experimental measurement system for the gaseous pvTx properties was developed. A pressure measurement system (range:0-13.8 MPa, the expanded (k=2) uncertainty was estimated to be within: ±800 Pa (0-6.9 MPa), ± 1600 Pa (6.9-13.8 MPa)), A temperature measurement system (Standard long-Stem platinum resistance thermometer range:-189～660 ℃, the uncertainty is better than ±2.1 mK), a high vaccum system and a gas distributing system were developed.The gaseous pv Tx properties of CO2 molar concentration of 95.73% CO2/Ar mixtures were measured via the Burnett-isochoric method. The second and third virial coefficients that were obtained through obtained, as well as a truncated viral equation of state were obtained.