大压比MVR蒸发结晶装置研制与应用  

Development and Application of Mechanical Vapor Recompression Evaporation Crystallization Device with High Pressure Ratio

作　　者：邢玉雷 胡斌[3] 吕宏卿 韩克鑫 齐春华 谢春刚 XING Yu-lei;HU Bin;Lü Hong-qing;HAN Ke-xin;QI Chun-hua;XIE Chun-gang(The Institute of Seawater Desalination and Multipurpose Utilization,MNR,Tianjin 300192,China;Tianjin Haiyue Water Treatment High Tech Co.Ltd.,Tianjin 300192,China;School of Mechanical Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]自然资源部天津海水淡化与综合利用研究所,天津300192 [2]天津海跃水处理高科技有限公司,天津300192 [3]上海交通大学机械与动力工程学院,上海200240

出　　处：《中国给水排水》2023年第24期46-52,共7页China Water & Wastewater

基　　金：天津市技术创新引导专项(基金)(18YDYGHZ00100)。

摘　　要：设计开发了面积利用系数为0.85的4/4齿对称转子型线及相应双螺杆蒸汽压缩机,通过与强制循环蒸发工艺耦合,研制了一台处理负荷为24 m^(3)/d的大压比MVR蒸发结晶装置,并开展了高盐高COD工业废水处理应用和运行分析,顺利通过168 h性能测试。结果表明,装置自动运行稳定,各项技术参数均达到或优于设计值,平均废水处理负荷1 m^(3)/h,进水TDS约100000 mg/L、COD约9200 mg/L,出水TDS约17.4 mg/L、COD约60 mg/L,出水指标优于排放标准,吨水处理电耗约68 kW·h;压缩机蒸汽压缩温升22.3℃,压比为2.26,效率为71.2%,在母液沸点升为16℃工况下运行稳定。通过大压比双螺杆蒸汽压缩机的开发与应用,研制的MVR装置提升了蒸汽压缩温升,增强了其在高沸点升废水蒸发结晶中的实用性和可靠性。本研究对基于双螺杆蒸汽压缩机的大压比MVR蒸发结晶装置的技术集成、工艺开发和设计制造具有一定的指导意义。In this study,one 4-4 configuration symmetrical rotor profile with an area utilization coefficient of 0.85 and the twin-screw vapor compressor basing the profile was designed and developed.A device of mechanical vapor recompression(MVR) evaporation crystallization with a treatment load of 24m^(3)/d was developed with high pressure ratio by coupling of forced circulation evaporation process,and its application and operation analysis in industrial wastewater treatment with high salt and high COD were conducted,which passed through the 168-hour performance test smoothly.The results indicate that the MVR device can operate automatically and stably,with all technical indicators meeting or exceeding the design specifications.It handles a treatment load of approximately 1 m^(3)/h,resulting in discharged water with the total dissolved solid(TDS) and chemical oxygen demand(COD) at about 17.4 mg/L and 60 mg/L respectively,compared to the raw wastewater values of about 100 000 mg/L and 9 200 mg/L,respectively.These results are better than the discharge requirements.The power consumption of wastewater treatment is about 68 kW·h/m3.Meanwhile,the temperature rise of compressor compressing vapor is about 22.3 ℃with a pressure ratio of 2.26,and average compressing efficiency of about 71.2%.These specifications qualify the compressor for operation under the condition of 16 ℃ boiling point elevation in mother liquor.Through the innovation and application of twin-screw vapor compressor with high pressure ratio,the vapor compressing temperature rise of MVR device is improved obviously,that enhances its practicability and reliability in wastewater evaporation crystallization with high boiling point elevation.This study can serve as a guide for integrating technology,developing processes,and designing and manufacturing of MVR evaporation crystallization devices coupled with twin-screw vapor compressors.

关 键 词：废水处理 蒸发结晶 机械蒸汽再压缩 双螺杆蒸汽压缩机 

分 类 号：TU992[建筑科学—市政工程]