Comments on: 用建模推进钒氧化还原液流电池研发 - 优米账号 //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling 发布博客 Wed, 05 Feb 2025 02:04:31 +0000 hourly 1 https://wordpress.org/?v=6.7.2 By: 王 刚 //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling/#comment-39633 Wed, 05 Feb 2025 02:04:31 +0000 http://cn.staging.comsol.com/blogs?p=196411#comment-39633 In reply to 博文 靖.

按照您的设想,似乎是想进行电池的简化建模,即,通过单个条件(例如,集总类型)的电池来表征。如果是这种需求,不妨考虑使用集总电池接口,典型示例://www.co2jys.com/models?q=%E9%9B%86%E6%80%BB%E7%94%B5%E6%B1%A0。

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By: 博文 靖 //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling/#comment-39443 Thu, 16 Jan 2025 06:45:46 +0000 http://cn.staging.comsol.com/blogs?p=196411#comment-39443 您好,我对该案例中多孔电极的“过电位tcd.eta_per1”云图存在疑惑,过电位云图能反应正、负极各个点的极化程度,如果我想使用一个数值来代表整个电池的过电位,请问我该如何得到呢?对正、负电极各个点的过电位进行(面积)加权平均后再做差值是否能表征整个电池的过电位?如果这么做不合理,请问应该使用什么样的方法呢?

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By: D 陈 //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling/#comment-34483 Thu, 22 Aug 2024 01:36:24 +0000 http://cn.staging.comsol.com/blogs?p=196411#comment-34483 In reply to yongchao wang.

好嘞,感谢~

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By: yongchao wang //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling/#comment-34463 Wed, 21 Aug 2024 02:50:05 +0000 http://cn.staging.comsol.com/blogs?p=196411#comment-34463 In reply to D 陈.

从反应方程式的角度来说,应该将正极|隔膜界面上的两个电极反应中的快速不可逆电极反应的速率限制物质浓度clim,进行调换;在此模型中因为两个物质浓度在该边界均为0,所以对计算结果没有影响

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By: D 陈 //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling/#comment-34333 Fri, 16 Aug 2024 06:14:38 +0000 http://cn.staging.comsol.com/blogs?p=196411#comment-34333 您好,我还想请问一下案例库中的VRFB模型。在它的Tertiary Current Distribution, Nernst-Planck (Ion Exchange Membrane)接口中,正极|隔膜界面上的两个电极反应,他们的快速不可逆电极反应的速率限制物质浓度clim,我感觉互相交换一下似乎更合理一些?
比如涉及到vcv3mem和vcv4mem的电极反应,clim似乎是cv3mem而不是cv2mem?

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By: D 陈 //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling/#comment-33243 Mon, 15 Jul 2024 10:19:20 +0000 http://cn.staging.comsol.com/blogs?p=196411#comment-33243 In reply to Yi Fan Wang.

好嘞谢谢~

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By: Yi Fan Wang //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling/#comment-33213 Mon, 15 Jul 2024 06:15:44 +0000 http://cn.staging.comsol.com/blogs?p=196411#comment-33213 In reply to D 陈.

是的,有关案例内容的更多介绍,您可以参阅文献“K. Knehr, E Agar, C. Dennison, A. Kalidindi, and E. Kumbur, “A Transient Vanadium FlowBattery Model Incorporating Vanadium Crossover and Water Transport through theMembrane”, J. Electrochem. Soc., vol. 159, no. 9, pp A1446–A1459, 2012.”和“A.A. Shah, M.J. Watt-Smith, and F.C. Walsh “A dynamic performance model for redox-flow
batteries involving soluble species”, Electrochimica Acta vol. 53, pp 8087–8100, 2008.”

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By: D 陈 //www.co2jys.com/blogs/advancing-vanadium-redox-flow-batteries-with-modeling/#comment-33073 Thu, 11 Jul 2024 02:46:15 +0000 http://cn.staging.comsol.com/blogs?p=196411#comment-33073 您好,这个案例给了我很大的帮助,非常感谢。另外,我想问问“co2jys Multiphysics® 模拟钒氧化还原液流电池”这个文档第5页里面关于硫酸解离源项的公式有个地方我这么理解是否正确,恳请解答一下。
假设硫酸初始活度是a,第一步解离后,硫酸、氢离子、硫酸氢根的活度分别是0 a a。第二步解离刚开始,硫酸氢根、氢离子、硫酸根的活度分别是a a 0,某时刻解离程度是x,那么中间他们的变化分别是-ax ax ax,解离平衡时,硫酸、氢离子、硫酸氢根的活度分别是a-ax a+ax ax。
然后按照解离源项rd里的公式,aH+ – aHSO4 -=a+ax –(a-ax)=2ax,aH+ + aHSO4 -=a+ax +(a-ax)=2a,两者相除就是x,接着又-β。。那是不是这样:x离β越接近,就越达到解离平衡,各离子的变化速率就越小,反之亦然?

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