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中文摘要：
本文分析了含CO2混合气体在低温下的相变特性，研究了CO2低温分离方法的改进思路，并在此基础上，提出一种新型的CO2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CO2以液态分离出来，既避免了CO2的冻结问题，又有效地降低了CO2的压缩耗功，从而大幅降低了新型一体化流程的CO2回收能耗。进一步研究表明，混合气中初压和初始CO2浓度越高、制冷循环性能越好，新型一体化方法的CO2回收能耗越低。本文研究成果为从具有较高CO2浓度的混合气体中分离回收CO2提供了新的思路与途径。
英文摘要：
In this paper, we analyzed the phase change characteristics of the CO2 mixed gases at the low temperature, and presented a novel CO2 separation and compression method. By this method, most of CO2 can be separated from the mixed gases at a relatively higher condensing temperature through multi-stage cryogenic separation and compression, which can not only avoid the problem of C02 frozing, but also reduce the compression work effectively. Accordingly, the energy consumption of the novel CO2 separation and compression process will decrease greatly. Further study indicates that the performance of the novel process will be better with the elevation of the refrigeration coefficient, CO2 concentration and the initial pressure of the mixed gas. This paper provides; a new idea and approach to separate and compress CO2 with low energy consumption from the mixed gases with higher CO2 concentration.
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