Simulation and energy analysis of CO2 capture from CO2-EOR extraction gas using cryogenic fractionation

Publication date: Available online 19 July 2019Source: Journal of the Taiwan Institute of Chemical EngineersAuthor(s): Bingcheng Liu, Mengmeng Zhang, Xuan Yang, Ting WangAbstractCO2-EOR is a recognized effective technology to enhance oil recovery by injecting CO2 into the reservoir to increase layer pressure. With the exploitation of oil, the overflow of large amount of CO2 has caused great difficulties to gas treatment and transportation, even affects the climate if it is discharged directly. CO2 capture from extraction gas plays an increasingly important role in oilfield due to these problems. Compared with other methods, cryogenic fractionation is an ideal method for large extraction gas volume and high CO2 content. In the presented work, Aspen HYSYS was used to simulate the cryogenic fractionation separation process with 100,000 Nm3/d extraction gas and 81.4% CO2 content. Meanwhile, the main factors including pressure of fractionating tower, condensation temperature, reboiling temperature, and CO2 content in raw gas which effect system cooling consumption are also analyzed. The simulation results show that the CO2 purity and recovery can reach over 95% and 90% respectively for high CO2 concentration. The effect of these parameters on system overall cooling consumption is significant and the reasonable parameters are obtained in this work. The results will provide some improvements for scale-up application of cryogenic fractionation in extraction gas CO2 capture.

Source: Journal of the Taiwan Institute of Chemical Engineers - July 20, 2019 Category: Chemistry Source Type: research