脱盐水系统极高回收率工艺包的设计及工程应用  

Design and Engineering Application of a High-recovery Process Package for DI Water System

作　　者：胡俊辉 安康 李建华 曾雄辉 陈然 Hu Junhui;An Kang;Li Jianhua;Zeng Xionghui;Chen Ran(Huixinying(Jiaxing)Environmental Protection Technology Co.,Ltd.,Jiaxing Zhejiang 314201,China)

机构地区：[1]汇信盈(嘉兴)环保技术有限公司,浙江嘉兴314201

出　　处：《山西化工》2024年第6期242-246,共5页Shanxi Chemical Industry

摘　　要：针对脱盐水系统中水的利用率普遍较低的问题[1],设计了一种提高回收率的脱盐水工艺包,通过采用优质的高回收率超滤单元和对预处理工艺段的高浊排放水进行降浊处理回用[2],同时对脱盐水工艺段的高盐排放水进行深度除硬脱盐回用[3],使系统水的利用率大于92%。运行结果表明,通过采用高强度、耐污染的超滤膜产品,经过优化其运行模式,可以使超滤单元做到95%以上的回收率,并通过回用超滤排放的高浊排污水能使预处理段的回收率做到99.5%;通过对RO浓水的深度软化,再用浓水RO进行脱盐回用,可以把脱盐段的回收率做到92%,这样整个脱盐水系统就能轻松实现92%以上的极高回收率。产水水质能满足高温高压锅炉补给水电导率<0.2μS/cm,ρ(SiO_(2))<0.02 mg/L的水质标准[4],可作为厂区锅炉补给水使用。成本分析表明,该脱盐水工艺包的吨水运行成本约13元(含税及其它全部费用),具有较好的经济性。In view of the problem of generally low recovery rate of deionization water system,a DI(deionization)water process package is developed and designed to improve the recovery rate.The recovery rate of this process package is greater than 92%,by using a high-recovery UF unit,reusing its high-turbidity discharge water in the pretreatment process section,and reusing the high salinity discharge water in the desalination process section with deeply soften and desalination.The operation result of the project shows that the recovery rate of the pretreatment section can achieve 99.5%,by using a high recovery rate of 95%for UF unit and reusing UF discharged high turbidity water.The specific measure is to use high-strength,anti-fouling UF membrane products and optimize the operation mode of the UF unit,and the recovery rate of the desalination section can meet 92%,by reusing deeply-softened and desalination for RO concentration.So it makes easy to achieve extremely high recovery rate of more than 92%for the whole DI system.Moreover,the water quality of the system production can meet the standards of high temperature and pressure boiler make-up water<0.2μS/cm,ρ(SiO_(2))<0.02 mg/L,and can be used as boiler make-up water in the plant.Additionally,the project cost analysis shows that the operation cost of this DI water process package is about 13 yuan(total costs)per cubic meter DI water,which has high economy.

关 键 词：脱盐水系统 极高回收率工艺包 优质超滤 降浊除硬 

分 类 号：X703[环境科学与工程—环境工程]