运行工况对多向扰流强化管CaSO4污垢特性的影响  

Operating conditions affecting CaSO4 fouling characteristics in multi-spiral groove enhanced tube

作　　者：范波 熊扬恒[1] 薛海鹏 王家林 FAN Bo;XIONG Yangheng;XUE Haipeng;WANG Jialin(School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072

出　　处：《热科学与技术》2020年第2期185-192,共8页Journal of Thermal Science and Technology

摘　　要：为更深入并准确研究运行工况条件对多向扰流强化管CaSO4污垢特性的影响,基于FLUENT软件的UDF功能构建了恒壁温条件下结垢传质过程与温度场的耦合作用关系,进一步采用田口法对运行工况致垢的贡献率进行了模拟比较,分析了贡献率较大的运行工况对污垢特性的影响。结果表明:溶液溶度致垢的贡献率占53.2%,而壁面温度、进口流速和进口温度的贡献率分别为22.2%、19.3%和5.3%;溶液溶度在4.0~2.5 kg/m^3,污垢热阻降低达90.47%,并且随溶度降低其相邻溶度间降低比例基本不变;壁面温度在340.0~315.0 K时,污垢热阻降低了65.22%,在前一阶段相邻温度间降低比例基本上不变,当达到320.0 K后降低明显;流速在1.0~2.5 m/s时,随流速的增加,污垢热阻降低68.65%,且随流速的增加,相邻流速间降低的速度明显减缓。In order to more deeply and accurately study the effect of operating conditions on the fouling characteristics of CaSO4 in multi-spiral groove enhanced tube, the coupling function between the fouling mass transfer process and the temperature field under constant wall temperature conditions was constructed based on the UDF function of FLUENT software. The Taguchi method was used to simulate and compare the contribution rate of operating conditions to fouling, and the impact of operating conditions with large contribution rate on fouling characteristics was analyzed. The results show that the contribution rate of solution solubility to fouling is 53.2%, while the contribution rates of wall surface temperature, inlet flow rate and inlet temperature are 22.2%, 19.3% and 5.3%, respectively.When the solution solubility is in the range of 4.0-2.5 kg/m^3, the thermal resistance of the fouling is reduced by 90.47%, and the decreasing ratio between the adjacent solubility is almost constant with decreasing solubility.When the wall surface temperature is in the range of 340.0-315.0 K, the fouling thermal resistance is reduced by 65.22% and in the previous stage the reduction ratio between adjacent temperatures is almost the same, but decreases significantly when the wall temperature reaches 320.0 K.When the flow rate is in the range of 1.0-2.5 m/s, the thermal resistance of fouling is reduced by 68.65% with the increase of flow rate, and with the increase of flow velocity, the rate of decrease between adjoining flow rates has slowed down significantly.

关 键 词：多向扰流强化管 运行工况 污垢特性 数值模拟 耦合计算 

分 类 号：TK124[动力工程及工程热物理—工程热物理]