氯碱工业离子膜电解槽内气液两相流动特性Gas-Liquid Flow in an Ion-Exchange Membrane Electrolysis Cell from Chlor-Alkali Industry
张丽,戴俊,刘秀明,刘国桢,刘云义
摘要(Abstract):
为验证数值模拟结果的正确性,建立了氯碱工业离子膜电解槽冷模实验装置,对电解槽内液体速度和气含率进行了实验测量,实验数据验证了模拟结果。利用实验和数值模拟方法对不同工况下气含率和气体体积分布进行了研究;对循环板上开口处膜侧瞬时压力进行了监测,分析了该处压力波动特性。结果表明,随着气液流量增大,电解槽内气含率增大,顶部气体滞留层增厚。当电流密度为10 k A×m~(-2)时,槽内气含率达到9.08%,为4.5 k A×m~(-2)时的近3倍。气体体积分数沿电解槽竖直方向逐渐增大,在膜与槽板夹角处最大。循环板上开口处膜侧压力信号波动明显,高频脉动主要由液体流动引起,低频脉动主要由气体流动引起。
关键词(KeyWords): 氯碱工业;电解槽;两相流;压力波动
基金项目(Foundation): 辽宁省高校创新团队支持计划资助项目(LT2013010);; 国家自然科学基金(51406125);; 辽宁省自然科学基金(201602596)
作者(Author): 张丽,戴俊,刘秀明,刘国桢,刘云义
参考文献(References):
- [1]YI Bao-lian(衣宝廉),QU Tian-xi(曲天锡),ZHANG En-jun(张恩浚),et al.Plate filter press type chlor alkali cell with oxygen cathode(采用氧阴极的压滤机式氯碱电解槽)[J].Journal of Chemical Engineering of Chinese Universities(高校化学工程学报),1996,10(3):258-263.
- [2]LI Su-gai(李素改).Energy consumption status and application progress of energy saving technology of chlor alkali industry(氯碱行业能源消耗现状及节能技术应用进展)[J].China Chlor-Alkali(中国氯碱),2014,5(3):1-3.
- [3]ZHOU Qiang(周强),WANG Qi(王奇),JIANG Yong(江泳).Research on operation technologies of Asahi Kasei NCZ zero-polar distance electrolyzers(旭化成NCZ零极距电解槽应用技术研究)[J].Chlor-Alkali Industry(氯碱工业),2012,48(10):13-16.
- [4]Janssen L J J,Hoogland J G.The effect of electrolytically evolved gas bubbles on the thickness of the diffusion layer[J].Electrochimica Acta,1970,15(6):1013-1023.
- [5]Gijsbers H F M,Janssen L J J.Distribution of mass transfer over a 0.5-m-tall hydrogen-evolving electrode[J].Journal of Applied Electrochemistry,1989,19(5):637-648.
- [6]Vogt H.The incremental ohmic resistance caused by bubbles adhering to an electrode[J].Journal of Applied Electrochemistry,1983,13(1):87-88.
- [7]Xiong Y,Jialing L,Hong S.Bubble effects on ion exchange membranes-an electrochemical study[J].Journal of Applied Electrochemistry,1992,22(5):486-490.
- [8]Bergner D.Membrane cells for chlor-alkali electrolysis[J].Journal of Applied Electrochemistry,1982,12(6):631-644.
- [9]Chandran R R,Chin D T.Reactor analysis of a chlor-alkali membrane cell[J].Electrochimica Acta,1986,31(1):39-50.
- [10]Jalali A A,Mohannadi F,Ashrafizadeh S N.Effects of process conditions on cell voltage,current efficiency and voltage balance of a chlor-alkali membrane cell[J].Desalination,2009,237(1):126-139.
- [11]Dahlkild A A.Modeling the two-phase flow and current distribution along a vertical gas-evolving electrode[J].Journal of Fluid Mechanics,2001,428(2):249-272.
- [12]Wedin R,Dahlkild A A.Numerical and analytical hydrodynamic two-phase study of an industrial gas-lift chlorate reactor[J].American Society of Mechanical Engineers,Pressure Vessels and Piping Division,1999,397(1):125-136.
- [13]Zuber N,Findlay J A.Average volumetric concentration in two-phase flow systems[J].Journal of Heat Transfer,1965,87(4):453-462.
- [14]Hua J S,Wang C H.Numerical simulation of bubble-driven liquid flows[J].Chemical Engineering Science,2000,55(19):4159-4173.
- [15]Aldas K.Application of a two-phase flow model for hydrogen evolution in an electrochemical cell[J].Applied Mathematics and Computation,2004,154(2):507-519.
- [16]Mat M D,Aldas K.Application of a two-phase flow model for natural convection in an electrochemical cell[J].International Journal of Hydrogen Energy,2005,30(4):411-420.
- [17]Farshad A,Hasan R.Applying a modified two-fluid model to numerical simulation of two-phase flow in the membrane chlor-alkali cells[J].Iranian Journal of Chemistry and Chemical Engineering,2008,27(3):51-61.
- [18]YUE Wen-ting(岳雯婷),ZHANG Li(张丽),LIU Xiu-ming(刘秀明),et al.Influence of current density on transfer characteristics in electrolysis cell of chlor-alkali industry(电流密度对氯碱工业离子膜电解槽传递特性影响)[J].Journal of Chemical Industry and Engineering(China)(化工学报),2015,66(3):915-923.
- [19]Asahi Kasei Corporation.Used for alkali metal chloride aqueous solution of electrolyzer unit slots:Japan,JP 242002/99[P].1999-08-27.
- [20]Asahi Kasei Corporation.Bipolar press filter type electrolytic cell(双极压滤器型电解池):China,CN 92102754.0[P].1992-12-09.