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本文分析了含CO_2混合气体在低温下的相变特性,研究了CO_2低温分离方法的改进思路,并在此基础上,提出一种新型的CO_2分离压缩一体化方法。该方法通过多级压缩、多级冷却以及多级分离相结合,可在相对较高的冷凝温度下将混合气体中绝大部分CO_2以液态分离出来,既避免了CO_2的冻结问题,又有效地降低了CO_2的压缩耗功,从而大幅降低了新型一体化流程的CO_2回收能耗。进一步研究表明,混合气中初压和初始CO_2浓度越高、制冷循环性能越好,新型一体化方法的CO_2回收能耗越低。本文研究成果为从具有较高CO_2浓度的混合气体中分离回收CO_2提供了新的思路与途径。
In this paper, the phase transition characteristics of CO 2 -containing mixed gases at low temperature were analyzed. The improved method of CO 2 cryogenic separation was also studied. Based on this, a new CO 2 separation and compression integrated method was proposed. The method combines multi-stage compression, multi-stage cooling and multi-stage separation to separate most of the CO 2 in the mixed gas liquid at a relatively high condensation temperature, thereby avoiding the CO 2 freezing problem and effectively Reducing the compression power consumption of CO 2, thereby drastically reducing the CO 2 recovery energy consumption of the new integrated process. Further studies have shown that the higher the initial pressure and the initial CO 2 concentration in the mixture, the better the refrigeration cycle performance, and the lower the CO 2 recovery energy consumption of the new integrated process. The research results in this paper provide new ideas and approaches for the separation and recovery of CO 2 from the mixed gas with higher CO 2 concentration.