换热器壳程结构的实验研究及节能分析  

An Experimental Study and Energy Saving Analysis of Shell-side Structure for Shell-and-tube Exchanger

作　　者：邹静[1] 曾力丁[1] 于洋[1] 郑伟业[1] 朱冬生[1] 

机构地区：[1]华东理工大学,上海200237

出　　处：《制冷与空调（四川）》2011年第5期466-470,共5页Refrigeration and Air Conditioning

摘　　要：为对管壳式换热器不同壳程结构进行实验研究,设计建造了普通单弓形折流板圆管换热器和无折流板的椭圆扭曲管换热器实验台。通过测试换热器管壳两侧的传热系数、压降和换热量等参数,对比分析了两种不同壳程结构的换热器在相同尺寸下、相同工况的传热性能。实验结果表明椭圆扭曲管管侧的表面传热系数比普通圆管和折流板换热器均有大幅度提高,随雷诺数的增大,管内表面传热系数约为普通圆管的1.27～1.43倍,管外壳程表面传热系数约为普通圆管的1.36～1.76倍,能够有效提高换热效率。另外与传统的单弓形折流板换热器相比,壳程压降显著减小,约为折流板换热器的30～35%。椭圆扭曲管换热器既强化了管内传热,又减小了壳程压降,是一种非常有效的提高换热效率的手段。综合比较管壳侧的传热效率,发现在低雷诺数工况椭圆扭曲管换热器的节能效果更好。A test platform of shell-and-tube exchanger was designed and established to conduct an experimental research.With the same size and operating condition,heat transfer properties including pressure drop and heat transfer coefficient of heat transfers with twisted tubes,plain tubes and baffles were analyzed and compared.The experimental result indicated that heat transfer coefficient of twisted tubes has been vastly improved.As Reynolds number adding,tube-side heat transfer coefficient of twisted tube bundle is about 1.27 to 1.43 times that of plain tubes,also its shell-side heat transfer coefficient is as about 1.36 to 1.76 times as plain tubes.And compared with traditional single segmental baffled heat exchanger,the pressure drop of twisted tube heat exchanger decreased significantly.It＇s about 30 to 35 percent of baffled heat exchanger varying with different Reynolds number.Due to its higher heat transfer coefficient in tubes,lower pressure drop in shell,twisted elliptic tubes heat exchanger is definitely an effective method to enhance heat transfer,and it shows better intensification of energy saving at low Reynolds number.

关 键 词：椭圆扭曲管 强化传热 节能 高效 

分 类 号：TQ051.5[化学工程]