南疆盐碱水分流技术研究

发布时间：2018-08-04 08:31

【摘要】：南疆地区降水稀少,水资源匮乏,灌区排出的盐碱水不仅造成水资源浪费,而且引发一系列生态环境问题。因此,南疆盐碱水资源化利用的研究具有十分重要的意义。论文根据排碱渠中盐碱水的分层特点,发明了基于浮力原理的物理分流装置,其两个浮力球带动左右闸门工作,可将排碱渠上层低盐度水体和下层较高盐度的水体分流。浮力球和闸门分别采用耐蚀性好的中空玻璃微珠复合材料与蒙乃尔合金。整个装置具有结构简单、造价低廉的优点。发明了自动控制盐水分流装置,对物理分流装置作了改进,以提高盐碱水分流的精度,并实现完全自动化。用两个传感器对排碱渠中上下层盐碱水的盐度分别进行实时监测,然后驱动左右闸门上升和下降,从而使得符合设定阈值要求的盐碱水流过,进而达到上下层盐碱水分流的目的。引入盐度控制方程和边界条件的自定义函数(UDF),用FLUENT软件对盐碱水分流过程进行数值模拟,结果表明,分流装置确能将不同盐度的水体分流。上导流槽得到低盐度水体,下导流槽得到较高盐度水体。分流的效率和效果取决于装置尺寸、分层流流速和盐度分布等因素。应根据实际情况进行调整和优化。
[Abstract]:In southern Xinjiang, precipitation is scarce and water resources are scarce. Saline-alkali water discharged from irrigated areas not only causes waste of water resources, but also causes a series of ecological and environmental problems. Therefore, the study on the utilization of saline-alkali water in southern Xinjiang is of great significance. According to the delamination characteristics of saline-alkali water in the drainage canal, a physical distributary device based on buoyancy principle is invented in this paper. The two buoyancy spheres drive the work of the left and right gates, which can separate the upper low salinity water body of the drainage canal from the lower higher salinity water body. The buoyancy ball and gate were made of hollow glass bead composite and Monel alloy with good corrosion resistance respectively. The whole device has the advantages of simple structure and low cost. An automatic control brine shunt device is invented and the physical shunt device is improved to improve the accuracy of saline-alkali water flow and to realize complete automation. Two sensors are used to monitor the salinity of the upper and lower layers of saline-alkali water in the drainage channel in real time, and then drive the left and right gates to rise and decrease, thus making the saline-alkali water flow through the required threshold. Then the purpose of saline-alkali water flow in the upper and lower layers is achieved. The salinization control equation and the self-defined function of boundary condition (UDF), are introduced to simulate the saline-alkali water diversion process by using FLUENT software. The results show that the distributary device can actually distribute the water body with different salinity. Low salinity water was obtained in the upper channel and higher salinity water in the lower channel. The efficiency and effect of the distributary depend on the size of the unit, the velocity of stratified flow and the distribution of salinity. Should be adjusted and optimized according to the actual situation.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV213.9

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