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Analysis of plate multi-effect distillation system coupled with thermal power generating unit

机译：板式多效蒸馏系统与火电机组耦合分析

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摘要

In order to explore the practical potential of plate exchanger as evaporator in multi-effect distillation (MED) system, the physico-mathematical model is established for a plate MED system coupled with thermal power generating unit. A MED seawater desalination system with shell and tube evaporator in operation producing freshwater 10,000 ton/day is selected as comparison. The system design with different types of plate evaporators and off-design operating performance are conducted. The results indicate that the overall area can be significantly reduced with plate evaporator compared with that of shell and tube evaporator. The plate MED system can achieve a greater gain of ratio (GOR) than that of original tubular system by selecting suitable entrainment ratio of the last effect. The performance of the plate MED system can be improved by reducing the length of single plate of evaporators, for more channels with shorter plate can enhance heat transfer in evaporator and restrain the boiling point evaluation of evaporating brine. Influences of inlet temperature and flow rate of feed brine, flow rate of extracting source vapor from steam turbine under off-design conditions on the performance of plate MED system are investigated either. The investigations may provide a reference for the application of plate MED technology coupled with waste heat utilization of thermal power generating unit.
机译：为了探索板式换热器作为蒸发器在多效蒸馏（MED）系统中的实际应用潜力，建立了与热力发电装置耦合的板式MED系统的物理数学模型。选择使用运行中的带管壳式蒸发器的MED海水淡化系统作为比较，每天产生10,000吨/天的淡水。进行了具有不同类型的板式蒸发器和偏离设计的运行性能的系统设计。结果表明，与壳管式蒸发器相比，平板蒸发器的总面积可以明显减少。通过选择合适的最后效应夹带比率，平板MED系统可以获得比原始管状系统更大的比率增益（GOR）。板式MED系统的性能可以通过减少蒸发器的单板长度来提高，因为板短的更多通道可以增强蒸发器中的热传递并限制蒸发盐水的沸点评估。研究了非设计条件下进水温度，进料盐水流量，汽轮机抽汽源蒸汽流量对平板MED系统性能的影响。该研究可为平板MED技术与火力发电厂余热利用的结合提供参考。

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