板式换热器颗粒污垢特性的实验研究  

Experimental Study on Particle Fouling in Plate Heat Exchangers

作　　者：徐志明[1] 董兵[1] 杜祥云[1] 王丙林[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林132012

出　　处：《动力工程学报》2013年第7期539-543,共5页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51076025)

摘　　要：以纳米氧化镁颗粒溶液为实验工质,进行了板式换热器颗粒污垢特性的实验研究,分析了颗粒质量浓度、颗粒粒径、流速和低温介质温度对颗粒污垢热阻的影响.结果表明:板式换热器颗粒污垢无明显诱导期存在,结垢速率和污垢热阻渐进值均随颗粒质量浓度的增大而增大,且增大幅度逐渐减小;颗粒粒径对污垢热阻的影响较明显,在相同质量浓度下,颗粒粒径越小,结垢速率越快,且污垢热阻越大;流速对污垢热阻的影响较为复杂,高流速下的结垢速率略大于低流速下,且高流速下达到稳定时的污垢热阻渐进值小于低流速下;低温介质温度对颗粒污垢热阻的影响不明显.Taking the solution of nano magnesium oxide particles as the working medium, experimental study on particle fouling in plate heat exchangers was carried out so as to analyze the influence of particle concentration, particle size, flow velocity and medium temperature on the particle fouling resistance. Re suits show that the particle fouling in plate heat exchangers has no obvious induction period; both the scaling rate and the asymptotic fouling resistance increase with the rise of particle concentration, in a lowering gradient; the particle size has relatively obvious effect on the fouling resistance; for a fixed mass concentration of particles, the smaller the particle size is, the higher the scaling rate and fouling resistance will be; the influence of flow velocity on the fouling resistances is relatively complex; the scaling rate at a higher flow velocity is slightly greater than that at a lower flow velocity, and the asymptotic fouling resistance is smaller under the former condition than that under the latter condition; the temperature of low-temperature medium has no obvious effect on the particle fouling resistance.

关 键 词：板式换热器 纳米颗粒 污垢特性 诱导期 

分 类 号：TK124[动力工程及工程热物理—工程热物理]