换热器结垢工况下换热系数变化分析研究_高明.pdf

,,, , ( , 250061) : 介绍了换热器污垢热阻的数学模型, 包括污垢沉积模型和剥蚀模型分析了换热器结垢工况下的换热 系数的变化, 重 研究了时间流体雷诺数Re 和流体 污垢界面温度T 对换热系数K 的影响, 以及在结垢诱 s 导期内换热系数K 的变化得到了冷却水流速与污垢热阻之间的关系式, 界面温度 T 与污垢热阻和换热系数 s 之间关系的示意图, 并得出了诱导期内的换热系数K 大于结垢过程的其他四个阶段的结论最后, 阐述了分析 结果对工程的实际指导意义 :结垢; 模型;换热系数; 热阻 :TK124 :A : 1004- 3950(2003)04- 0009- 05 Variation of heat transfer coefficient and its mathematic model for heat exchangers in conditions of fouling GAO Ming, SHUN Fong-zhong, HUANG Xing- uan, SHI Yue-tao, WANG Na-i hua (School of Energy Dynamic Engineering, Shandong University, Jinan 250061, China) Abstract:This paper introduces the mathematic model of heat exchangers fouling resistance, including deposit model and corrosion model. And analyzes change of heat transfer coefficient, emphasizing to study the effect of time, Re and surface temperatureTs to heat transfer coefficient, and thevariety of heat transfer coefficient in inducement period. Then getting the relative formula of circularwatervelocity and fouling resistance, the sketch map of surface temperature Ts and fouling resis- tance, heat transfer coefficient. In addition, drawing the conclusion that compared to other period, inducement periods heat transfer coefficient is higher. Finally, the paper expounds the direction meaning to factual project. Ke words:fouling; model; heat transfer coefficient; heat resistance 0 , 1TD , , , , , , , ,, 1 , , [1] , 1 1,