摘要
防凝胶污染是膜脱盐技术的难点之一。本文采用化学交联法对海水淡化实际操作条件下产生的凝胶污染物进行了重构,并对凝胶的各种理化性质进行了测试和表征。重构既解决了真实海水实验时需要长时间运行的缺点,又优化了使用简单自制盐水实验时不能有效解释凝胶污染真实特征的问题。测试结果表明,凝胶层的低热导率使膜两侧温差减小,这与凝胶的致密结构共同导致了产水系统阻力的增加。凝胶层的亲水性质和兼具黏弹性的特点,使其具有较强的抗拉压应力和抗冲刷能力,容易黏附在膜表面上。粗粒化模拟所构建的模型可以反应凝胶的部分真实参数,可用于后续计算。
Gel fouling is a key problem in membrane desalination.In this study,gel contaminants generated under the actual operating conditions of seawater desalination were reconstructed by a chemical crosslinking method,and the various physical and chemical properties of the gel were tested and characterized.The reconstruction not only solves the disadvantage of requiring long operation in real seawater experiments,but also optimizes the problem that the real characteristics of gel contamination cannot be effectively explained in experiments with simple synthetic seawater.The results show that the mass transfer resistance of the water-producing system was not only caused by the dense structure of gel,but also the decrease of the temperature difference on both sides of the membrane caused by the low heat conduction of the gel layer.The gel contaminant exhibited hydrophilic and viscoelastic properties,which confer strong tensile strength,compressive stress,and anti-scouring ability.The characteristics of gel make it easy to adhere to the membrane surface.The model constructed by coarse-grained simulation can reflect some real parameters of gel and could be used for subsequent calculation.
作者
王琦
张立志
WANG Qi;ZHANG Lizhi(School of Electric Power Engineering,South China University of Technology,Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry,Guangzhou 510641,China;School of Chemistry and Chemical Engineering,South China University of Technology,Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry,Guangzhou 510641,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2024年第9期2814-2821,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.51936005)。
关键词
污染物凝胶
重构技术
热质传递
黏弹性
耗散粒子动力学模拟
contaminant gel
reconstruction
heat and mass transfer
viscoelastic
dissipative particle dynamics(DPD)simulation
