全钒氧化还原液流电池流场及其传质模拟研究

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	全钒氧化还原液流电池流场及其传质模拟研究
	田野
学位类型	硕士
导师	严川伟
	2012
学位授予单位	中国科学院金属研究所
学位授予地点	北京
学位专业	腐蚀科学与防护
关键词	钒电池流场结构传质计算机模拟二次开发 Vanadium Redox Flow Battery Flow Field Species Transport Simulation Further Development
摘要	"全钒氧化还原液流电池（All Vanadium Redox Flow Battery）因其循环寿命长、功率容量相对独立、可快速大电流充放电等特点，成为最具潜力的可满足风能、太阳能等新能源发电系统规模储能需求的电池。论文首先从钒电池流场结构设计和优化入手，利用商业有限元软件建立了钒电池流场结构和钒离子传输的三维模型，依据此模型设计不同的钒液流电池流场结构，研究流场结构对压力、物质浓度传输和电池性能的影响。模拟结果表明，对称的出入口结构可以有效降低压损；非对称结构可提高物质传输的均匀性并进一步提高反应的均一性，在应用于小规模钒电池及电堆时后者不失为一种提高电池性能的有效方法。并且可根据流速来调整进出口的间隔从而改善电解液分配及传质的均匀性。在此基础上提出以反应物（或生成物）浓度体积分数衡量传质均匀性。基于模拟结果，分别加工了五种不同结构的流场，组装电池并测试其性能。通过观察不同进出口间隔和对称情况对电池性能的影响来判断流场是否适用。实验结果表明非对称的流场结构电池性能优于对称结构，并且容量衰减较慢；间隔为1cm的四进口结构电池传质强于间隔为1.3cm进出口的电池，实验测得其库伦效率达95%，与模拟结果的预测趋势吻合较好。针对现今的有限元软件指令繁复不易上手等问题，封装模块没有专门针对钒电池的模块，本文探索性的将MATLAB与有限元软件结合，利用MATLAB简洁高效的代码和强大的可视化功能开发用户图形界面（GUI），建立了具有简易图形界面的钒电池计算的独立模块。该独立模块易于上手，可用于迅速计算流场分配、物质传输和支路电流计算等，并可进一步扩展。"
其他摘要	"All vanadium redox flow battery has many advantages, such as long theoretical life, relatively independent power and capacity, quick high-current charge and discharge, these unique advantages make VRB become the most potential battery which can meet the demand of large scale power storage of wind energy, solar and other new energy power generation systems. With the development of the national power security and strategic technology reserve, there is a rigid demand for new energy, it gives VRB a great driving force. Now days, VRB still has three major challenges: material, assembly and control. Firstly, this paper starts from the almost blank field of assembly: optimization and design of VRB’s flow field, built a three-dimension model of VRB’s flow field and vanadium ion transmission by using the commercial FEM software. This paper designs five kinds of flow field base on the 3-D model, then we studies the influence of different structure of flow field on pressure, concentration transmission and battery performance. The simulation result shows: the symmetry structure can effectively reduce pressure loss; asymmetric structure can improve the transmission and uniformity of ions distribution, asymmetric structure is suitable for small-scale VRB stack. And we can improve the uniformity of electrolyte distribution by adjusting the import and export. On this basis, this paper put forward a standard for measuring the uniformity of transmission, that is reactants (or resultant) volume fraction of concentration. Under the guidance of simulation, we produce five kinds of structure, then assemble battery and test their performance. So we can judge whether the flow field is appropriate or not through their performance. The experimental data indicates that asymmetric structure is better than symmetric structure, its capacity loss is much slower; the transmission of structure that has 4 inlet and there is 1cm interval between each inlet, which is much stronger than the structure that has 3 inlet and each inlet has 1.3cm interval, the 4 inlet structure’s coulombic efficiency achieved 95%, this value had a good agreement with the simulation results. Finally, because of FEM software’s complex orders and without ready model for VRB, we tentatively combinates Matlab and Comsol, develope a graphical user interface by using the efficient code and powerful visualization capabilities of Matlab, our target is laying the foundation for building an independent VRB model. This GUI is easy to use and can be quickly used to calculate the electrolyte distribution, material transmission and shunt current. And this method can give a good guidance to VRB stacks by some adjustment.
文献类型	学位论文
条目标识符	http://ir.imr.ac.cn/handle/321006/64531
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	田野. 全钒氧化还原液流电池流场及其传质模拟研究[D]. 北京. 中国科学院金属研究所,2012.