高盐矿井水处理系统的节能优化设计研究

Study on Energy Saving Optimization Design of Mine Water Treatment System in High Salt Mine

为解决高盐废水治理系统运行电耗成本高的难题,围绕工艺选择、系统余热余压回收进行了设计研究。以龙固煤矿高盐废水治理项目为研究对象,从系统整体能耗角度综合考虑,分别选择了分步协同预处理技术、电渗析处理工艺、MVR蒸发结晶工艺,采用透平式能量回收装置回收二级反渗透三段浓水余压为二段浓水升压,提取电渗析转化的热能用于补充蒸发结晶系统用热,利用蒸发器母液加热进入蒸发结晶系统的浓盐水实现冷热需求互补降低系统电耗,降低水流阻力,合理利用地势高差,降低输送水能耗。

In order to solve the problem of high power consumption and cost in the operation of high salt wastewater treatment system, the process selection and the recovery of waste heat and pressure of the system were designed and studied. Taking the high salt wastewater treatment project of Longgu Coal Mine as the research object, from the point of view of the overall energy consumption of the system, the step-by-step cooperative pre-treatment technology,electrodialysis treatment process and MVR evaporation crystallization process are selected respectively. The turbine energy recovery device is used to recover the residual pressure of the second stage reverse osmosis and the third stage concentrated water as the second stage concentrated water pressure, and the heat energy converted by electrodialysis is extracted to supplement the heat used in the evaporation crystallization system. The evaporator mother liquor is used to heat the concentrated brine entering the evaporation crystallization system to realize the complementary cold and hot demand to reduce the power consumption of the system, reduce the flow resistance, make rational use of the height difference of topography, and reduce the energy consumption of conveying water.