Baowu Water Technology, Co., Ltd.

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 VaporRecompression,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 sta⁃ble performance of the key apparatus, mechanical vapor recompression (MVR) system, is one of thecritical factors. During the operation of MVR, issues such as scaling and blockages frequently arise dur⁃ing the stages of preheating in two-stage (or three-stage) plate heat exchangers, heating in shell andtube heat exchangers, and crystallization in crystallizers. These issues necessitate frequent chemicalcleaning or manual physical cleaning, which affects the stable operation of the MVR system. Thisstudy, through the analysis and summarization of common scaling locations and types in actual engi⁃neering cases, identifies several aspects: The direct impact of variations in ion concentration in the feedliquid on scaling rate and quality, the distinct relationships between two types of scaling calcium sulfateand calcium carbonate and temperature, the influence of heat transfer velocity per unit heat exchangearea on ion scaling rate, three-dimensional fluorescence spectroscopic analysis of organic componentsin 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 beeffectively reduced, offering a reference for the commissioning and operation of MVR, thereby enhan⁃cing the operational efficiency and reliability of zero liquid discharge (ZLD) system and advancing thedevelopment of wastewater treatment technologies in the steel industry.

国家重点研发计划资助项目(2022YFC3203005)

王文俊. 钢铁废水零排放 MVR 系统稳定运行影响因素研究[J]. 能源环境保护, 2024, 38(1): 167-173.

WANG Wenjun. Causal factors influencing the stable operation of zero liquid discharge MVR systems in steelwastewater treatment[J]. Energy Environmental Protection, 2024, 38(1): 167-173.