不同扩展换热面传热、积灰、磨损特性对比  

Comparative analysis of heat transfer,ash deposition and attrition performances on different extended surfaces

作　　者：赵虹[1] 周霭琳[1] 施浩勋 陈理帅 邓芙蓉 杨建国[1] 胡劲逸[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]浙江浙能技术研究院有限公司,浙江杭州310003 [3]浙江天地环保工程有限公司,浙江杭州310009

出　　处：《热力发电》2015年第4期33-38,共6页Thermal Power Generation

摘　　要：为了对低温换热器优化选型,利用热力计算和数值模拟的方法,对比分析了螺旋肋片管和H型鳍片管的传热、积灰、磨损特性。结果表明:常规结构参数下,单位长度的螺旋肋片管具有更大的换热效率,在达到相同换热量时,其钢材消耗是H型鳍片管的42.87%,烟气阻力是H型鳍片管的61.45%;H型鳍片管由于其特殊的沟槽结构,形成的涡流方向与主流速度相反,垂直冲刷基管背风面,达到自清灰的目的,其鳍片无侧向气流冲刷,整体磨损较轻。因此,螺旋肋片管的换热性能更好,但H型鳍片管的防积灰和耐磨性均优于螺旋肋片管。To optimize and select the low temperature heat exchanger, comparative analysis on heat transfer, ash deposition and attrition performances of H-finned tubes and spiral finned tubes was conducted, by ther- modynamic calculation and numerical simulation methods. The results show that, with conventional structural parameters, the spiral finned tube with unit length has higher heat transfer efficiency, and its steel consumption （flow resistance） is only 42.87% （61.45%） of that of the H-finned tube when heat transfer rate is the same. Due to the special groove structure, the swirling generated in the H-finned tube has the opposite direction to the mainstream. It shocks to the tube lee side vertically, so the H-finned tube can a- chieve ash self-removing. The abrasion of the H-finned tubes is lighter overall, and the fin has no sideway scouring. Therefore, the spiral finned tube has better heat transfer property while the H-finned tube has ad- vantages in ash deposition and attrition resistance.

关 键 词：低温换热器 优化选型 螺旋肋片管 H型鳍片管 传热 阻力 积灰 磨损 

分 类 号：TK172[动力工程及工程热物理—热能工程]