| 含CO2的蒸汽凝结换热特性 |
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| 作者姓名： | 葛明慧 于冉冉 赵军 刘联胜 |
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| 作者单位： | 1. 河北工业大学能源与环境工程学院, 天津 300401;
2. 天津大学中低温热能高效利用教育部重点实验室, 天津 300072;
3. 天津生态城能源投资建设有限公司, 天津 300480 |
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| 基金项目： | 国家自然科学基金（51576059）、天津市科技支撑计划-科技服务业重大专项（14ZCDZGX00821）和河北省高等学校自然科学研究青年基金（QN2016065）资助 |
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| 摘 要： | 基于双边界层理论，建立含CO2的蒸汽在竖直平板表面凝结换热模型。CO2的存在极大恶化了凝结换热性能。在CO2浓度一定时，随着过冷度的增加，热流密度逐渐增大，凝结换热系数逐渐减小，界面温度近乎线性降低；随着CO2浓度的增大，凝结换热系数迅速降低，界面温度逐渐增大。CO2的存在使得凝结液膜表面形成一层气膜，随过冷度的增大，液膜厚度逐渐增加，气膜厚度逐渐减小，但气膜厚度要比液膜厚度大一个数量级；随着CO2浓度的增大，液膜厚度与气膜厚度均在减小，但气膜热阻与液膜热阻的比值逐渐增大，并且在高浓度CO2情况下，气膜热阻成为主导热阻。
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| 关 键 词： | CO2 混合蒸气 凝结换热 不凝气 |
| 收稿时间： | 2017-05-02 |
| 修稿时间： | 2017-08-15 |
Condensation heat transfer characteristics of steam with CO2 |
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| Authors: | GE Minghui YU Ranran ZHAO Jun LIU Liansheng |
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| Institution: | 1. School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China;
2. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education, Tianjin University, Tianjin 300072, China;
3. Tianjin Eco-city Energy Investment & Construction Co., Ltd, Tianjin 300480, China |
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| Abstract: | Based on the double boundary layer model, this work established a laminar condensation heat transfer model of steam with CO2 on a vertical plate. The condensation heat transfer performance is deteriorated greatly due to the presence of CO2. At a certain concentration of CO2, with the increase of surface sub-cooling, the heat flux increases, the heat transfer coefficient decreases, and the interface temperature decreases almost linearly. With the increase of CO2 concentration, the heat transfer coefficient decreases rapidly while the interface temperature increases gradually. In addition, the presence of CO2 results in the formation of a layer of gas film outside the liquid film. With the increase of surface sub-cooling, the thickness of liquid film increases and the thickness of gas film decreases. Hoowever the thickness of the gas film is one order of magnitude larger than that of the liquid film. With the increase of CO2 concentration, the thicknesses of liquid film and gas film both increase. However, the thermal resistance ratio of gas film to liquid film increases gradually, and the gas thermal resistance becomes dominant at high concentrations of CO2. |
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| Keywords: | CO2" target="_blank">2')">CO2 vapor mixture condensation heat transfer non-condensable gas |
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