Study On Shunting Technology Of Saline-alkali Water In Southern Xinjiang

In Southern Xinjiang,the precipitation is scarce which leads to the poor water resources.The saline-alkali water discharged from irrigated areas not only causes waste of water resources,but also triggers a series of ecological and environmental problems.Therefore,the research on the utilization of saline-alkali water resources in Southern Xinjiang is of great significance.Based on the stratification characteristics of saline-alkali water in the alkali draining ditches,a physical shunting device based on the buoyancy principle invents.The two floating buoyancy balls drive the left and right gates,which separate the upper water with lower salinity and the lower water with higher salinity.The buoyancy ball and the gate are made of hollow glass bead composites and monel alloy,respectively,both of which are in good corrosion resistance.The whole device has the advantages of simple structure and low cost.In order to improve the accuracy of separating saline water and to achieve fully automation,an automatic control of saline water shunting device invents to improve the physical shunt device.The primary objective of separating specified salinity of saline-alkali water is realized through two sensors,which drive the left and right gates to rise and fall based on the salinity of the upper and lower saline-alkali water in alkali draining ditches it detects.User Defined Functions(UDF)with salinity control equation and boundary condition are introduced.The numerical simulation of the saline-alkali water shunting process with FLUENT software shows that the shunting device can separate the water based on salinity.Low salinity water was get from the upper diversion trench,while higher salinity water was get from the lower diversion trench.The efficiency of the shunt depends on its size,stratification flow velocity and salinity distribution.Adjustment and optimization should be subjected to the actual situation.