非均匀磁场对零价铁吸附性能影响的计算流体动力学模拟分析  

CFD simulation analysis of impact of non-uniform magnetic field on ZVI adsorption performance

作　　者：郭幸斐[1,2] 王连进 马瑞远 GUO Xingfei;WANG Lianjin;MA Ruiyuan(School of Environmental Science and Engineering,Tiangong University,Tianjin 300387,China;Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学环境科学与工程学院,天津300387 [2]天津工业大学分离膜与膜过程国家重点实验室,天津300387

出　　处：《天津工业大学学报》2025年第1期47-52,共6页Journal of Tiangong University

基　　金：天津市科技计划项目(20ZYJDJC00100)。

摘　　要：针对零价铁(ZVI)易钝化性限制了其吸附能力的问题。利用计算流体动力学(CFD)实现磁场和流场的耦合,通过仿真模拟分析磁场对ZVI分布特征和吸附特性的影响机理,同时优化磁场条件以提高ZVI的吸附效率,并进行实验验证。模拟结果表明:与均匀磁场相比,效用距离为0 mm的两段式非均匀磁场中磁梯度力的存在提高了反应器内的流体压力,有利于降低ZVI的钝化率,对磁性颗粒的防沉积效果明显,可进一步提高ZVI对于4-氯苯酚(4-CP)的去除能力。验证实验表明:均匀磁场下4-CP降解率为13.05%,非均匀磁场下4-CP降解率为20.55%,非均匀磁场降解能力是均匀磁场的1.57倍,与模拟分析结论一致。Aiming at the question of limited adsorption capacity due to the passivity of zero-valent iron ZVI,the computational fluid dynamics(CFD)was used to couple magnetic and flow fields,and the mechanism of how the magnetic field affects the distribution characteristics and adsorption properties of ZVI was analyzed by simulation.Simultaneously,the conditions of magnetic field were optimized to enhance the adsorption efficiency of ZVI,which was then verified through experiments.The simulation results indicate that,compared to a uniform magnetic field,the presence of magnetic gradient force in a two-segment non-uniform magnetic field with a utility distance of 0 mm increases the fluid pressure within the reactor,which is beneficial for reducing the passivation rate of ZVI.The anti-deposition effect on magnetic particles is evident.It can further improve the removal ability of ZVI for 4-chlorophenol(4-CP).The verification experiment shows that the degradation rate of 4-CP is 13.05%in a uniform magnetic field and 20.55%in a non-uniform magnetic field.The degradation capacity of the non-uniform magnetic field is 1.57 times that of the uniform magnetic field,which is consistent with the simulation analysis conclusion.

关 键 词：零价铁 非均匀磁场 计算流体力学 4-氯苯酚 吸附性能 

分 类 号：TQ426.8[化学工程]