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管输CO2在临界点附近会出现物性参数发生剧烈波动的准临界特性,进而影响管道安全稳定运行。采用密度作为基准参数,拟合出大规模管输CO2密度波动最剧烈处的准临界温度关系式,分析杂质对管输CO2准临界温度关系的影响并提出安全控制方案,以国内首条CO2管道示范工程为实例,提出安全输送操作建议。研究表明:非极性及弱极性杂质将使准临界温度线向低温方向偏移,强极性杂质及水汽将使准临界温度线向高温方向偏移;管输含不同杂质的多组分CO2时,需要采用不同的起始温度、压力,以避免管内工况接近准临界温度线或进入两相区,采用高于14 MPa压力输送,管内介质可以保持安全稳定流动。国内首条大规模长距离超临界CO2管道示范工程输送燃煤电厂排放的烟气,需采用输送含非极性杂质CO2对应的安全控制技术。(图4,表1,参18)
Pipeline CO2 will appear in the critical point near the critical parameters of violent fluctuations in the quasi-critical characteristics, thus affecting the safe and stable operation of the pipeline. Using the density as a reference parameter, the quasi-critical temperature relationship of the most intense CO2 density fluctuation in a large-scale pipe is fitted to analyze the influence of impurities on the relationship between the CO2 sub-critical temperature and the safety control scheme. The first CO2 pipe Demonstration project as an example, put forward suggestions for safe transportation operation. The results show that the non-polar and weak polar impurities will shift the quasi-critical temperature line to low temperature, and the strong polar impurities and water vapor will shift the quasi-critical temperature line to high temperature. CO2, you need to use a different starting temperature and pressure, to avoid the tube conditions close to the quasi-critical temperature line or into the two-phase zone, the use of pressure higher than 14 MPa, the media can maintain a safe and stable flow tube. China’s first large-scale long-distance supercritical CO2 pipeline demonstration project to send flue gas emitted from coal-fired power plants, the need to adopt non-polar impurities containing CO2 transport safety control technology corresponding. (Figure 4, Table 1, reference 18)