【作者】 翟丽华；

【导师】 林榕端；

【作者基本信息】 广西大学 ， 化工过程机械， 2004， 硕士

【摘要】 本文介绍了国内外防垢除垢技术的研究进展及现状分析。同时介绍了换热管内微型液轮机的结构及其自动除垢防垢并强化传热的原理。换热管内微型液轮机不需要外加动力，当管内液体流动时，液轮机自动连续旋转，不断擦刮、刷洗管壁，使换热管内壁难以形成垢层，此外液轮机有效扰乱了流体滞流边界层，从而达到防垢除垢、强化传热的目的。 在前期工作的基础上，本文将继续研究内置液轮机换热管的工作特性，包括换热管内置入液轮机传热性能。此外，在换热管内壁人工制造化学垢层后，还进行了相应的除垢试验。试验研究结果表明，液轮机的转速与管内流体流速近似成线性关系，操作弹性大，流体阻力小，可以满足换热设备对流量变化及流体阻力的要求。在相同的Re下，换热管内置液轮机时的总传热系数K明显比空管的高，K的提高率在24.15％～46.81％之间，液轮机起到了强化传热的作用。热工性能评价因子φ都是大于1的，表明换热管中置入液轮机后强化传热综合效果是比较好的。除垢试验也证明液轮机作为一种在线的机械清洗方法，具有良好的清洗防垢效果。这些试验都证明了内置微型液轮机换热管具有良好的工作特性。 同时，本文根据威尔逊法及修正威尔逊法，确定了空管和内置液轮机时换热管给热系数关联式中的C、P值。更多还原

【Abstract】 This paper introduces the present research situation in foul removing/preventing technologies of heat exchanger. The construction of the miniature hydraulic turbine inside tube, its operating principle in automatically removing and preventing fouling and enhancing heat transfer are introduced. Without the external force, the hydraulic turbine works itself while the fluid flow in the tube. As the insert continuously scrub the heat exchanger tube, it is hard to form the new foul. Furthermore, the hydraulic turbine disturb the boundary layer effectively, so it can realize the foul removing/preventing on line, constantly and automatically.Based on the former work, this paper keep on studying the working performance of built-in miniature hydraulic turbine heat exchanger tube, including the heat exchange performance of the miniature hydraulic turbine. Besides, the foul removing tests are also introduced. The results of the experiments show that the relation between the velocity of flow and the rotational speed of the miniature hydraulic turbine is approximating linear. The hydraulic turbine has big operated elasticity and small fluid resistance, it can satisfy the requirement of flow and resistance of the heat exchanger. And the heat transfer experiments show that the total heat transfer coefficient K is increased when the miniature hydraulic turbine is fixed in the heat exchange tube in the same Reynolds number, and the increasing ratio of the total heat transfer coefficient is between 24.15 % -46.81 %. Further, the value of is bigger than 1 which also prove the hydraulic turbine can achieve a high efficiency of heat transfer. Moreover, the results also prove that the hydraulic turbine can remove the foul constantly and automatically. These experiments all can prove that the working performance of built-in miniature hydraulic turbine heat exchanger tube is well.At the same time, using the method of Wilson, this paper confirm the value of C and P of the relating equation of the convection heat transfer coefficient in the heat exchanger tube with miniature hydraulic turbine and without insert.更多还原