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设计了1种基于流道式隔板的新型板式空气隙膜蒸馏组件,以质量分数3.5%的模拟海水为原料液,进行了海水淡化过程性能研究,主要考察了热料液进口温度、热料液流量等工艺参数和空气隙厚度、流道宽度、流道表面粗糙度等膜组件设计参数对膜组件性能的影响。结果表明,膜通量和热效率随着热料液温度的升高而增大;随着热料液流量的增加,膜通量增大,热效率减小;随着空气隙厚度和流道宽度的增加,膜通量减小,热效率增大;随着流道表面粗糙度的增加,膜通量增大,热效率基本不变。在空气隙厚度为1 mm,流道表面为锯齿状,流道宽度为24 mm,热料液进口温度为70℃时,膜通量和热效率最高分别达到13.0 kg/(m~2·h)和0.88,产水电导率始终低于12.0μS/cm,基于电导率的离子去除率高于99.99%。新型板式空气隙膜组件组装方便,结构紧凑,易于放大,有望发展成为一种有竞争力的新型海水及苦咸水淡化技术。
A new type of air gap membrane distillation unit based on flow channel separator was designed. The simulated seawater with mass fraction of 3.5% was used as raw material to study the performance of desalination process. The effects of hot liquid inlet temperature, hot material Liquid flow rate and other process parameters and air gap thickness, flow channel width, flow channel surface roughness of the membrane module design parameters of the performance of the membrane module. The results showed that the flux and thermal efficiency increased with the increase of hot liquid temperature. With the increase of hot liquid flow rate, the membrane flux increased and the thermal efficiency decreased. With the increase of air gap thickness and flow channel width Increase, membrane flux decreases, thermal efficiency increases; with the increase of flow channel surface roughness, membrane flux increases, the thermal efficiency of the same. When the air gap thickness is 1 mm, the surface of the runner is jagged, the width of the runner is 24 mm, and the inlet temperature of hot liquid is 70 ℃, the flux and thermal efficiency of the membrane reach 13.0 kg / (m ~ 2 · h) And 0.88, the conductivity of the produced water is always lower than 12.0 μS / cm, and the ionic conductivity based on the conductivity is higher than 99.99%. The new panel air gap membrane assembly easy to assemble, compact, easy to enlarge, is expected to develop into a competitive new seawater and brackish water desalination technology.