XINGYu-lei,HUBin,LüHong-qing,et al.Development and Application of Mechanical Vapor Recompression Evaporation Crystallization Device with High Pressure Ratio[J].China Water & Wastewater,2023,39(24):46-52.
大压比MVR蒸发结晶装置研制与应用
- Title:
- Development and Application of Mechanical Vapor Recompression Evaporation Crystallization Device with High Pressure Ratio
- Keywords:
- wastewater treatment; evaporation crystallization; mechanical vapor recompression; twin-screw mechanical vapor compressor
- 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 m3/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 m3/h，进水TDS约100 000 mg/L、COD约9 200 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。
- Abstract:
- 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 24 m3/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 m3/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.
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