Moisture swing adsorption(MSA)method uses water as a lever to efficiently drive direct air carbon capture.At present,its cycle theory and energy efficiency research are relatively scarce.In this paper,MSA process is analyzed from the perspective of thermodynamic cycle,and a 6-step MSA cycle is constructed in the three-dimensional coordinate system of temperature,humidity,and adsorption capacity.Ideal specific energy consumption,thermodynamic efficiency and adsorbent efficiency of basic isothermal MSA cycle and the 6-step MSA cycle are compared,and the effects of temperature and humidity on each indicator are analyzed.Under the adsorption condition of 25℃ and 30％RH,the introduction of temperature swing process can reduce capture energy consumption by 28％at most,and increase the limit of thermodynamic efficiency by 119％.
关键词
直接空气捕集/变湿吸附/热力学循环/能效分析
Key words
direct air capture/moisture swing adsorption/thermodynamic cycle/energy efficiency analysis
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