Enhancement of Gas Absorption by utilizing Solution Effect and Mist Formation

保护地球环境是21世纪最受关注的问题。高效吸收CO2气体是保护地球环境的重要技术之一。与一般的物理气体吸收一样，下降液膜和/或喷雾方法受液膜中气体扩散输运速率的支配。因此，吸收率的提高是有限的，即使施加任何改进，如声波对液膜的外部扰动，表面的增加是由于分散的小液滴等。从这个角度来看，本研究已经进行了追求一个高性能的CO2气体吸收方法。提出了以K2 CO 3颗粒为核，利用溶液效应和雾化作用进行气体吸收的新概念，并对K2 CO 3溶液的冷凝率和垂直冷却管内CO2气体吸收率（包括雾化率）进行了验证实验。对冷凝液和雾滴在冷却管表面的吸收速率进行了理论分析，并与实验数据进行了比较，验证了本文提出的概念，阐明了冷凝液和雾滴吸收CO2气体的机理。在此基础上，获得了物理气体吸收过程的基本知识.

Protection of global environment is the gravest concern in the 21st century. High efficiency of CO2 gas absorption may be one of the important techniques for protection of global environment. The falling liquid film and/or the spray methods as the general physical gas absorption were dominated by the rate of gas diffusion transport in the liquid film. So that the enhancement of absorption rate is limited, even if any improvement such as the external disturbance of liquid film by a sound wave, the increase of surface are due to dispersed small droplets and so on were applied.From this standpoint, this study has been conducted to pursue a high-performance CO2 gas absorption method. A new concept of gas absorption by utilizing solution effect and mist formation as nuclei of K2CO3 particles was proposed, and its proof experiment was conducted with regard to the K2CO3 solution condensation rate and the CO2 gas absorption rates in vertical cooling tube including mist formation rate. Theoretical analyses were performed on the gas absorption rates of the condensate formed on the cooling tube surface and of the mist droplets in the tube.Comparing the analytical results with the experimental data, the concept proposed in this paper was identified and mechanism of the CO2 gas absorption through the condensate and/or the mist droplets was clarified. On the basis of these findings, the fundamental knowledge of physical gas absorption process was obtained.