变压吸附技术分离模拟油田火驱尾气中的CO_2

采用变压吸附技术分离模拟油田火驱尾气(CO_2-N_2-CH_4混合体系)中的CO_2。考察了吸附压力、吸附温度和气体流量对吸附效果的影响。实验结果表明:在吸附温度为25℃、吸附压力为0.6 MPa、气体流量为2 000m L/min、初始CO_2体积分数为13.01%的条件下,CO_2的穿透吸附量为60.34 m L/g,CO_2吸附率为78.92%,碳分子筛对CO_2的分离因子为8.233;在床层利用率为0.523的条件下进行降压解吸,当吸附压力降至0.1 MPa时,出口CO_2体积分数约为80%,CO_2的回收率可达96.38%。

Separation of CO2 from Simulated Oilfield Fireflood Exhaust by Pressure Swing Adsorption Process

CO₂ was separated from the simulated oilfield fireflood exhaust （CO₂-N₂-CH₄ mixed system） by pressure swing adsorption process. The effects of adsorption pressure,adsorption temperature and gas flow on separation were studied. The experimental results show that：Under the conditions of adsorption temperature 25 ℃,adsorption pressure 0.6 MPa,gas flow rate 2 000 mL/min and initial CO₂ volume fraction 13.01%,the breakthrough adsorption capacity of CO₂ is 60.34 mL/g,the CO₂ adsorption rate is 78.92%,the CO₂ separation factor of carbon molecular sieve is 8.233;Pressure-reducing desorption is carried out when the bed use ratio is 0.523 and when the adsorption pressure is reduced to 0.1 MPa,the outlet CO₂ volume fraction is about 80%,the CO₂ recover rate can reach 96.38%.