钢铁废水零排放MVR系统稳定运行影响因素研究  

Causal factors influencing the stable operation of zero liquid dischargeMVR systems in steel wastewater treatment

作　　者：王文俊 WANG Wenjun(Baowu Water Technology,Co.,Ltd.,Shanghai 201999,China)

机构地区：[1]宝武水务科技有限公司,上海201999

出　　处：《能源环境保护》2024年第1期167-173,共7页Energy Environmental Protection

基　　金：国家重点研发计划资助项目(2022YFC3203005)。

摘　　要：为了确保钢铁废水零排放系统的顺利运行,主要装置机械蒸汽再压缩(Mechanical Vapor Recompression, MVR)系统的稳定运行是关键因素之一。MVR运行过程中,会出现结垢堵塞问题,主要发生在两级(或三级)板式换热器预热阶段、列管式换热器加热阶段和结晶器结晶阶段。这些问题需要频繁进行化学清洗或人工物理清理,从而影响了MVR系统的稳定运行。本研究通过分析总结实际工程案例中常见的结垢位置及结垢类型,指出原料液中离子浓度的变化会直接影响结垢速率和结垢质量,硫酸钙和碳酸钙两种结垢类型与温度之间存在不同关系,单位换热面积的换热流速对离子成垢速率的影响。本研究对原料液中有机物组成进行了三维荧光光谱分析,并对高温条件下阻垢剂选型标准等进行了分析与归纳,同时提出了针对性强的应对措施。通过控制这些关键因素,可以有效减少结垢问题,为MVR的调试和运行提供参考,有助于提高钢铁废水零排放系统的运行效率和可靠性,推动钢铁行业废水处理技术的发展。To ensure the smooth operation of the zero liquid discharge system in steel industry,the stable performance of the key apparatus,mechanical vapor recompression(MVR)system,is one of the critical factors.During the operation of MVR,issues such as scaling and blockages frequently arise during the stages of preheating in two-stage(or three-stage)plate heat exchangers,heating in shell and tube heat exchangers,and crystallization in crystallizers.These issues necessitate frequent chemical cleaning or manual physical cleaning,which affects the stable operation of the MVR system.This study,through the analysis and summarization of common scaling locations and types in actual engineering cases,identifies several aspects:The direct impact of variations in ion concentration in the feed liquid on scaling rate and quality,the distinct relationships between two types of scaling calcium sulfate and calcium carbonate and temperature,the influence of heat transfer velocity per unit heat exchange area on ion scaling rate,three-dimensional fluorescence spectroscopic analysis of organic components in the feed liquid,and the selection criteria for scale inhibitors under high-temperature conditions.Targeted countermeasures are also proposed.By controlling these key factors,the scaling issues can be effectively reduced,offering a reference for the commissioning and operation of MVR,thereby enhancing the operational efficiency and reliability of zero liquid discharge(ZLD)system and advancing the development of wastewater treatment technologies in the steel industry.

关 键 词：零排放 MVR 结垢 调试 钢铁工业废水 

分 类 号：X703[环境科学与工程—环境工程]