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为了探究水合物法分离混合气的分离效果,以CO2+N2混合气作为原料气进行了分离实验与模拟计算。基于Chen-Guo水合物相平衡理论建立了分离预测模型,并通过实验验证了模型的可靠性;通过实验与模拟计算分析了温度、初始压力、初始组成对分离效果的影响,结果表明:59%CO2+41%N2混合气(摩尔分数)的较佳分离温度为1.0～4.0℃,压力为4.5～6.0 MPa;分离温压一定时,CO2的回收率随原料气中CO2浓度的升高而升高,分离因子变化不明显。另外,进行了多级分离模拟,结果显示原料气中CO2的摩尔分数为0.3～0.85时宜采用水合物法分离,经过2～3级分离可达到较好的分离效果。
In order to explore the separation effect of hydrate separation gas mixture, CO2 + N2 gas mixture was used as the feed gas for separation experiment and simulation calculation. The separation prediction model was established based on Chen-Guo hydrate phase equilibrium theory, and the reliability of the model was verified by experiments. The effects of temperature, initial pressure and initial composition on the separation efficiency were analyzed by experiments and simulations. The results showed that 59% The optimal separation temperature of CO2 + 41% N2 mixture (mole fraction) is 1.0 ~ 4.0 ℃ and pressure is 4.5 ~ 6.0 MPa. When the temperature and pressure of separation are constant, the recovery of CO2 increases with the increase of CO2 concentration in feed gas High, the separation factor change is not obvious. In addition, a multi-stage separation simulation was carried out. The results showed that when the molar fraction of CO2 in the feed gas was 0.3-0.85, it was better to separate it by hydrate method. After 2 ~ 3 separation, better separation effect could be achieved.