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液体在重力作用下从布液装置向换热管内壁呈膜状流动的现象即为降膜流动,其成膜效果直接影响降膜蒸发器的传热性能,合理的布液装置结构与设计是决定降膜流动成膜效果的重要因素。当液体流量一定时,影响布液装置结构与设计是不同物性孔流系数。因此,建立降膜流动实验平台对布液装置进行研究,拟合不同物性下孔流系数C及成膜效果最佳的孔流系数范围,在此范围内设计布液装置结构与尺寸。结果表明:乙二醇物料小孔孔流系数C_(01)范围是0.718~0.754,布膜器开口孔流系数C_(02)范围是0.905~0.951,通过建立孔流系数C模型及范围,为工业乙二醇装置降膜蒸发器设计提供了重要的理论依据。
Liquid under the action of gravity flow from the cloth device to the inner wall of the heat exchange tube membrane flow is the falling film flow, and its film-forming effect directly affects the heat transfer performance of the falling film evaporator, reasonable cloth structure and design of the device is An important factor that determines the filming effect of falling film flow. When the liquid flow rate is constant, the fabric structure and design of the fluid device is different physical properties of flow coefficient. Therefore, a falling-film flow experiment platform was established to study the cloth liquid device and fit the flow coefficient C under different physical properties and the optimal flow-rate coefficient range of the film-forming effect. The structure and size of the liquid distributing device were designed within this range. The results showed that the pore water flow coefficient C 01 of ethylene glycol material ranged from 0.718 to 0.754, and the flow coefficient C 02 ranged from 0.905 to 0.951. By establishing the model and the range of flow coefficient C Industrial ethylene glycol plant falling film evaporator design provides an important theoretical basis.