强化换热管内污垢特性的数值研究  

Numerical Study of Fouling Characteristics of Intensified Heat Exchange Tubes

作　　者：张艾萍[1] 王新灵[1] 沈忠良[1] 

机构地区：[1]东北电力大学能源与动力工程学院

出　　处：《化工机械》2016年第5期631-640,共10页Chemical Engineering & Machinery

基　　金：国家自然科学基金项目(51076025);东北电力大学博士科研启动基金项目(BSJXM-201207)

摘　　要：运用FLUENT软件对CaCO_3析晶污垢在圆管和强化换热管内不同工况下的污垢特性进行了数值模拟,计算出CaCO_3溶液在各管内的温度场和浓度场,进而计算出CaCO_3析晶污垢的沉积率和剥蚀率随时间的变化规律,并在不考虑诱导期的情况下,从污垢沉积质量出发计算出污垢热阻随时间的变化规律。通过比较分析发现:CaCO_3析晶污垢在圆管及其强化换热管内的沉积率、剥蚀率与污垢热阻随入口浓度和入口速度的增大而增大,但是随入口溶液温度的增大而减小,强化换热管的抑垢效果要好于圆管。Through making use of FLUENT software, the characteristics of CaCO3 crystallization fouling in both circular tube and the intensified heat exchange tube under different working conditions were simulated and the CaCO3 solution＇ s temperature field and concentration field in these tubes were calculated, including the deposition rate and denudation rate of the CaCO3 crystallization fouling which changing with the time; and starting with the fouling deposition quality, calculating the fouling resistance which changing with the time was implemented without regard to the induction period. Comparative results show that, the deposition rate, denu- dation rate and the fouling resistance of CaCO3 crystallization fouling in tubes become increased with the rise of inlet concentration and inlet velocity and decreased with the increase of inlet solution temperature. The scale inhibition effect of intensified heat exchange tube outperforms that of the circular tube.

关 键 词：换热器 强化换热管 CaCO3析晶污垢 沉积率 剥蚀率 污垢热阻 

分 类 号：TQ051.5[化学工程]