| 摘要: |
| 由于密闭空间的特殊性，密闭空间大气中有害物质容易产生和富集。密闭空间中有害气体种类众多，其中二氧化碳对人体的健康影响最大。本文提出一种新的二氧化碳清除方法，通过降低被处理空气的温度使其中的二氧化碳冻结，从而与空气分离。通过与传统的二氧化碳清除方法对比，从理论上分析了冻结法清除有害气体的可行性与优势。为了进一步实验论证，本文还设计了一个利用液氮作为冷源的空气处理装置。实验表明，低温冻结法能快速地将空气中的二氧化碳冻结清除，当来流空气的二氧化碳体积浓度为1%，体积流量为100 L/min时，只需要18 min便能将出口处的二氧化碳浓度降低至0.1%以下。实验还表明，冻结法清除二氧化碳能达到并维持很低的二氧化碳体浓度，现阶段常用的乙醇胺吸附法仅能将二氧化碳浓度维持在0.5%，而实验过程中能将出口处二氧化碳的体积浓度降低至0.03%。 |
| 关键词: 空气净化 二氧化碳清除 冻结分离 密闭空间 |
| DOI： |
| Received:February 12, 2017 |
| 基金项目: |
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| Experimental Study on a System of Removing Carbon Dioxide by Freezing Method in Confined Space |
|
Xiao Ruxi, He Guogeng, Tian Qiqi, Cai Dehua, Li Keqiao, Niu Lijuan
|
| (School of Energy and Power Engineering, Huazhong University of Science and Technology) |
| Abstract: |
| The particular characteristics of confined space mean that it is easy for harmful substances to be produced and enriched. Moreover, the concentration of carbon dioxide in an enclosed space is strongly related with human health. In this paper, a new method is proposed in which carbon dioxide is removed from the air by reducing the air temperature to freeze and separate the carbon dioxide. Compared with traditional methods of removing carbon dioxide, the theoretical feasibility and advantages of the freezing method are analyzed. To verify the results of this theoretical analysis, an air purification system using liquid nitrogen as the cold source was designed. Experimental results show that the freezing method can remove carbon dioxide quickly. When the volume concentration of carbon dioxide is 1% and the volume flow of air is 100 L/min, it takes just 18 min to reduce the carbon dioxide concentration to less than 0.1%. The experiments also show that the freezing method of removing carbon dioxide can reach and maintain an extremely low carbon dioxide concentration of just 0.03%. This low concentration is hard to achieve by traditional methods. |
| Key words: air purification carbon dioxide removal frozen and separated confined space |
