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对含有高浓度CO2的水蒸气在竖直平板上冷凝传热特性进行了实验研究,得到了混合蒸气流速为0.8m/s、CO2质量分数为60.0%~94.0%工况下的凝结传热特性曲线。结果表明,CO2的加入会极大恶化蒸汽的凝结传热,随过冷度的增加凝结传热系数逐渐降低,且随着CO2质量分数的增大,凝结传热系数受过冷度的影响越来越小;随着CO2质量分数的增加,凝结传热系数继续降低,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传热特性发现,珠状凝结并没有明显强化传热优势。
Condensation heat transfer characteristics of water vapor containing high concentration of CO2 on a vertical plate were experimentally studied, and the heat transfer characteristics of condensation under the conditions of flow rate of 0.8m / s and CO2 content of 60.0% ~ 94.0% curve. The results show that the addition of CO2 will greatly deteriorate the condensation heat transfer, the condensation heat transfer coefficient decreases with the increase of the undercooling degree, and as the mass fraction of CO2 increases, the condensation heat transfer coefficient is more affected by the degree of undercooling With the increase of CO2 mass fraction, the condensation heat transfer coefficient continues to decrease, but the decreasing extent decreases gradually. Comparing the heat transfer characteristics of film-like and bead-shaped condensate under high CO2 content, it was found that bead-like coagulation did not significantly enhance the heat transfer.