自动清洗强化斜齿扭带的工程应用研究

Research on the Twisted Strip with Teeth to Enhance Self-cleaning Ability of Condensing Tubes

自动清洗强化斜齿扭带, 其原理是在扭带表面上按一定规律排列不对称斜齿 使被导向的传热流体对扭带的不对称反作用力形成一个旋转力矩 解决了现有的塑料扭带不能用于低流速传热设备的自动清洗问题 试验结果表明 与现有光滑扭带相比 斜齿型扭带自转清洗力矩增大了 倍多 传热系数平均提高了 30 即使 6 m 长传热管 4 管程的传热设备的阻力也只有 0.15 MPa 左右 仍然在一般的工程许可的范围内

The present smooth twisted strip without teeth cannot be used to self-clean away fouling for heat exchangers at low flowing velocity. For this reason, the authors develop a new kind of twisted strip with oblique teeth, which can enhance the force moment of self-cleaning. The principle is that there are dissymmetrical oblique teeth distributed evenly on both surfaces of strip and the heat transfer flowing fluid led by the strip has a dissymmetrical reacting force on the strip, thus the force moment of self-rotation is formed. The overall operation moment is increased by 277% and the overall heat transfer coefficient is increased by 30% over the smooth twisted strip. For a heat exchanger of 6m heat transfer tubes and 4 tube circuits, the flowing resistance is about 0.15 MPa at the flowing velocity of 0.5m/s. Therefore this new technique has a good application prospect.