含大量不凝气的蒸汽冷凝传热.pdf

* A051 含大量不凝气的蒸汽冷凝传热 ∗∗ 朱爱梅 王立国 熊日华 王世昌 李凭力 王志 （天津大学化工学院化学工程研究所，化学工程联合国家重点实验室 天津 300072） 摘 要 蒸汽冷凝传热中，不凝气的存在将导致传热过程的严重恶化。过去的研究大多只涉及极 少量或微量不凝气问题，而实际应用中这种情况常有突破。本文工作系在不凝气含量高达 70~90% 为了研究含大量不凝气的蒸汽冷凝传热过程，我们设计并建立适宜的实 的条件下进行冷凝传热。 验装置。通过调节干空气与常压蒸汽的配比和流量，改变混合气的进料条件，考察了混合气进料 中不凝气含量、混合气气速、冷却水温度对传热过程的影响。实验表明适当提高混合气的流速和 提高操作温度将有利于传热系数的提高，但需在实际设计中综合考虑其利弊。 关键词 不凝气 冷凝传热 传热系数 中图分类号 TQ028 文献标识码 A 文章编号 A STUDY ON HEAT-TRANSFER OF STEAM CONDENSATION IN HUMIDIFIED AIR ZHU Aimei ， WANG Liguo ， XIONG Rihua ，WANG Shichang ， LI Pingli and Wang Zhi Chemical Engineering Research Center，United State Key Laboratory, College of Chemical Engineering, Tianjin University, Tianjin, 300072, China ABSTRACT The presence of noncondensable gas sharply decreases the heat transfer coefficient in the heat-transfer of steam condensation. However, a few researchers only investigated on the effect little or trace noncondensable gas in the humidified air. In fact, there is a great deal of noncondensable gas in this system. The article investigated heat transfer of steam condensation with 70~90% noncondensable gas in the mixture gas. So we designed and set up appropriate experimental facility to investigate the effect of some factors, such as ratio of noncondensable gas in the mixture gas feed, gas velocity, the temperature of cool water, on heat transfer of steam condensation. Results show that total heat transfer coefficient can be improved by properly increasing mixture gas v