不同扩展换热面传热、积灰、磨损特性对比

摘要

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 struc-tural 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 malnstream.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.%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.