为使得整个机械蒸汽再压缩(MVR)蒸发系统的稳定性、节能性更好,借助Aspen Plus软件学习版,根据MVR运行原理,构建了MVR性能分析模型,并通过改变MVR节点的参数,模拟研究了蒸发量、补充新鲜蒸汽量与进料温度、蒸发压强的关系;蒸发量、沸点与进料浓度(NaCl质量分数)、蒸发压强的关系;蒸发器换热量、COP与蒸发压强、压缩机压力升的关系.通过分析模拟结果得出:适当减小压缩比,可以提高蒸发系统的COP;原料液应该加热到沸点后,再进入蒸发器中进行换热;从节能效果看,MVR蒸发系统更适合在低温低压下运行;在蒸发前,应对浓度较大的原料液进行适当的稀释.%Mechanical vapor recompression (MVR) system has been more and more popular because of its good energy-saving effect and small footprint,but how to make the stability and energy-saving of whole MVR evaporation system are better still need to further research on its performance.With the help of Aspen Plus software version,the MVR performance analysis model was set according to the operation principle of MVR to study the relationship between the amount of evaporation,the amount of fresh steam and feed temperature,evaporation pressure,and the relationship between evaporation and boiling temperature and feed concentration (NaCl mass fraction) and evaporation pressure,the relationship between heat transfer rate of evaporator,COP and evaporation pressure,pressure increase of compressor by changing the parameters of MVR node.Make conclusions by analyzing the simulation results:the COP can be improved by reducing the compression ratio properly;the feed should be heated to the boiling point temperature and then into the evaporator for heat transfer;MVR evaporation system is more suitable for operation at low temperature and low pressure from the view of energy saving;the feed with high concentration should be dilute before evaporation.
展开▼
