利用疏水性聚四氟乙烯(PTFE)中空纤维膜和PTFE毛细管换热器耦合组成的四效平流式真空膜蒸馏系统(ME-VMD)进行实验研究,重点考察了进料温度、进料流速和透过侧绝对压强对各效的膜通量和热效率及系统的产水量和造水比(GOR)的影响.实验结果表明,ME-VMD系统的效间温差随进料温度的升高而增大,随效数的增大而减小,系统的最佳效数与料液进口温度有直接关系;较高的进料温度、较低的料液流速及尽可能低的透过侧绝对压强均有助于膜通量、产水量及造水比的提高;而热效率则随进料温度的升高而逐步升高,随透过侧绝对压强及料液流速的升高而降低.当进料为温度90℃时,可采用四效真空膜蒸馏;当进料流速为0.30 m/s,透过侧绝对压强为3 kPa时,其造水比可达到2.15.
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