缠绕管中结晶结垢的模拟研究

Simulation of Crystal Scaling in Helical Tube

利用CFD模拟探究了缠绕管结构参数与操作参数对管内结垢的影响。结果表明,在相同的传热面积下,缠绕直径越小,传热效率越高,管内流体温度更高,管内更容易形成污垢。管径越小,管壁温度越容易传递到管内流体,管内更容易形成污垢。而缠绕角度则不会影响管内的结垢规律。与直管相比,当换热面积相同且恒定壁温或恒定热流时,缠绕管内流体温度较高,结垢率更大。当换热面积和换热量相同时,缠绕管内结垢率更小。

This work used CFD simulation to investigate the influence of helical pipe structure parameters and operating parameters on the fouling in the tube.Results showed that with the same heat exchange area, the smaller the helical tube diameter, the higher the heat transfer efficiency, and the higher the temperature of the fluid in the tube, which made it easier to form fouling in the tube. The smaller the pipe diameter, the easier it was for the pipe wall temperature to be transferred to the fluid in the pipe, leading to easier fouling in the pipe. The helical angle would not affect the fouling law in the tube. Compared with straight pipes, when the heat exchange area was the same with the constant wall temperature or the heat flow was constant, the fluid temperature in the helical pipe was higher, and the fouling rate was greater. When the heat exchange area and heat exchange amount were the same, the fouling rate in the helical pipe was smaller.