基于CFD模拟的某煤矿矿井水膜浓缩单元工艺优化与分析

Process optimization and analysis of a membrane concentration unit of coal mine water based on CFD simulation

针对高矿化度矿井水零排放过程中多级反渗透系统易结垢、易污染的问题,基于CFD模拟技术优化了某煤矿矿井水多级反渗透系统,针对两级膜浓缩单元膜元件排列组合形式提出了优化方案,分析了技术性和经济性。结果表明:优化前后多级反渗透系统膜内离子污染分布与阻垢剂用量基本保持一致;优化后的一级膜浓缩单元和二级膜浓缩单元分别减少6支膜(减少率约为5%),节省初始膜元件投入48 000元;矿井水回收率由96.5%提高到97%,吨水电力消耗升高了0.017元/m^(3),但吨水蒸发结晶费用降低了0.395元/m^(3),节省运行费用0.378元/m^(3)。

In order to solve the membrane scaling and fouling problem of a multi-stage reverse osmosis(RO) system in the zero discharge process of high salinity coal mine water,the multi-stage reverse osmosis(RO) system was optimized based on computational fluid dynamics(CFD) simulation.An optimization scheme was proposed regarding the arrangement and combination of membrane elements in twostage membrane concentration unit.Technical analysis and economic analysis were carried out.The results show that,after optimization,the distribution of ion pollution in the membrane element and the dosage of scale inhibitors remain the same.Six membrane elements are reduced in each of the primary membrane concentration unit and secondary membrane concentration unit,which accounting for approximately 5% of the whole membranes elements of the multi-stage reverse osmosis(RO) system.The total initial investment of membrane elements is saved by 48 000 yuan.The recovery rate of coal mine water increases from 96.5% to 97%.The power cost rises by 0.017 yuan/m^(3),while the evaporation and crystallization cost is reduced by 0.395 yuan/m^(3).Therefore,the total operation cost is saved by 0.379 yuan/m^(3).