凹凸板换热器内含不凝气的蒸汽冷凝特性研究  

Study on condensation of steam containing non-condensable gas in concave-convex plate heat exchanger

作　　者：李中阳 孟彦孝 刘炳成[2] 李强[2] LI Zhongyang;MENG Yanxiao;LIU Bingcheng;LI Qiang(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 266061,Shandong,China;Institute of Climate and Energy Sustainable Development,Qingdao University of Science and Technology,Qingdao 266061,Shandong,China)

机构地区：[1]青岛科技大学机电工程学院,山东青岛266061 [2]青岛科技大学气候变迁与能源可持续发展研究院,山东青岛266061

出　　处：《能源化工》2023年第4期32-38,共7页Energy Chemical Industry

摘　　要：凹凸板式换热器作为一种新型高效换热设备,其强化传热效果在于其板片的结构。鉴于不凝气的掺入对蒸汽在换热器内的冷凝传热效果也会产生影响,通过数值模拟对凹凸板换热器内含不凝气蒸汽冷凝特性进行研究。采用控制变量法研究了不凝气含量、凹凸台高度、间距以及倾角对凹凸板换热器冷凝传热的影响。结果表明,当不凝气体积分数从0增大到30%时,蒸汽冷凝水质量分数降低了41.05%。通过分析不同凹凸板片参数对换热器内冷凝换热的影响,发现冷凝水质量分数会随凹凸台间距增大而增大、凹凸台倾角减小而增大,随着凹凸台高度先增加后减少。当凹凸台间距为1.3 mm,凹凸台高度为4mm,凹凸台倾角为130°时,凹凸板换热器综合传热效果最好。Concave-convex plate heat exchanger is a new type of high efficiency heat transfer equipment,its enhanced heat transfer effect lies in its plate structure.In view of the incorporation of non-condensable gas will also affect the condensing heat transfer effect of steam in the heat exchanger,so the condensation characteristics of steam containing non-condensable gas in concave-convex plate heat exchanger are studied by numerical simulation.The control variable method is used to study the influence of non-condensable gas content,height,spacing and angle of concave-convex plate heat exchanger on condensing heat transfer through numerical simulation.The simulation results show that when the content increases from 0 to 30%,and the mass fraction of steam condensate water decreases by 41.05%.By analyzing the influence of different concave-convex plate parameters on the condensation heat transfer in heat exchanger,it is found that the mass fraction of steam condensate water increases with the distance between concave-convex platforms,and the angle of concave-convex platform decreases,and it increases first and then decreases with the height of concave-convex platforms.When the distance between concave-convex plate is 1.3 mm,the height of concave-convex plate is 4 mm,and the angle between concave-convex plate is 130°,the concave convex plate heat exchanger has the best heat transfer effect.

关 键 词：竖直板域通道 传热特性 蒸汽冷凝 凹凸板片 

分 类 号：TQ051.5[化学工程]