含高浓度CO2的水蒸气在竖直平板上的凝结换热实验研究

Experimental Investigation of Steam Condensation with High Concentration CO2 on Vertical Plate

中文关键词: 不凝性气体,CO₂,凝结换热特性,竖直平板

英文关键词: Non-condensable  gas, CO₂, Condensation  heat transfer  characteristics, Vertical  plate

中文摘要:

      本文对含有高浓度CO₂的水蒸气在竖直平板上冷凝换热特性进行了实验研究,得到了混合蒸气流速为0.8m/s,CO₂质量浓度为60%～94%工况下的凝结换热特性曲线。结果表明,CO₂的加入会极大恶化蒸汽的凝结换热,随过冷度的增加凝结换热系数逐渐降低,且随着CO₂质量浓度的增大,凝结换热系数受过冷度的影响越来越小；随着CO₂质量浓度的增加,凝结换热系数继续降低,但降低幅度逐渐减缓。对比高CO₂质量分数下膜状和珠状凝结换热特性发现,珠状凝结并没有明显强化传热优势。

英文摘要:

      An investigation was conducted for steam condensation with high fractional CO₂ on a vertical plate. Condensation heat transfer characteristics were obtained with a steam mixture velocity of 0.8m/s and CO₂ mass fraction of 30%～94%. The condensation heat transfer performance significantly deteriorated with the increase of the concentration of CO₂, decreased with the increase of surface sub-cooling and this influence decreased as the CO₂ mass fraction increased. Also, the variation amplitude of heat transfer coefficient deceased with the increase of CO₂ concentration. Compared with film condensation, the drop condensation almost has no significant superiority in heat transfer characteristics under high fractional CO₂.