组合转子阻垢特性的实验研究

Experimental study of the anti-fouling characteristics of assembled rotors

针对在换热器运行中起强化传热与自清洁作用的内插件组合转子进行了实验研究。实验测得光管、内置螺旋两叶片开槽转子和螺旋纽带的换热管内单位面积污垢沉积量随时间的变化趋势,并得出内置组合转子换热管在不同流速和不同水浴温度下的阻垢特性。实验结果表明:相较于光管,螺旋两叶片开槽转子与螺旋纽带都具有较好的阻垢特性,而螺旋两叶片开槽转子阻垢性能更优,污垢渐近值为螺旋纽带的72%;随着流速的增加,内置组合转子换热管内污垢渐近值减小,且达到渐近值所需时间延长,阻垢性能增强;水浴温度的提高使污垢渐近值增大,达到渐近值所需时间缩短,阻垢性能减弱。

Assembled rotors can enhance efficiency of heating and anti-fouling during the running of heat exchangers. In this work we research the anti-fouling characteristics of assembled rotors. The experimental results show that a helical blade rotor with grooves and a twisted stripe both have better anti-fouling characteristics than a smooth tube, and the anti-fouling characteristics of the helical blade rotor with grooves is better than that of the twisted stripe. The dirt asymptotic value is 72% of the twisted stripe. The dirt asymptotic value of tube decreased with increasing velocity, and longer times are required to attain the dirt asymptotic value, which means the anti-fouling characteristics increased. In addition, the dirt asymptotic value of tube increased with increasing water bath temperature, the less time was required to attain the dirt asymptotic value, which means the anti-fouling characteristics decreased.