钙铜复合吸收剂CO_(2)捕集性能优化研究进展

The Progress in the Research on Optimizing CO_(2) Capture Performance of CaO/CuO Composites

开发高效、低成本的CO_(2)捕集技术是我国实现“碳达峰、碳中和”目标的重要途径。基于钙铜复合吸收剂的钙循环耦合化学链燃烧工艺是一种改进的钙循环技术,通过耦合化学链燃烧来替代钙循环技术中高能耗的空气分离器,可显著降低系统能耗、提高其经济性,受到了国内外学者的广泛关注。介绍了钙循环耦合化学链燃烧工艺的基本原理,阐述了目前钙循环耦合化学链燃烧工艺面临的重大挑战——钙铜复合吸收剂CO_(2)捕集性能在循环过程中的急剧衰减;综述了提高钙铜复合吸收剂CO_(2)捕集性能的改性措施,主要包括载体负载法、水蒸气活化、高温热预处理等;综合分析了各种改性方法的优缺点并指明了今后的研究方向。

The development of efficient and low-cost CO_(2) capture technology is an important approach for China to achieve the goal of“carbon peak and carbon neutrality”.The process of calcium looping integrated with chemical looping combustion based on CaO/CuO composites is a modified calcium looping process.In such a process,chemical looping combustion is coupled to substitute the energy-intensive air separation unit commonly used in the calcium looping,thus significantly reducing the system's energy consumption and improving the economy.The calcium looping integrated with chemical looping combustion process has attracted great attention worldwide.The basic principle of the calcium looping integrated with chemical looping combustion process is introduced,and the major challenge that the process faces is described,i.e.,a rapid decline in CO_(2) capture performance of CaO/CuO composites during cycling operations.Moreover,the modification methods to enhance the CO_(2) capture performance of CaO/CuO composites are reviewed,mainly including the incorporation of stabilizer,steam activation and high-temperature thermal pretreatment.Finally,the advantages and disadvantages of various modification methods are analyzed comprehensively,and the direction to future research is discussed.