工程科学学报.第42卷.第2期：154-162.2020年2月 Chinese Journal of Engineering,Vol.42,No.2:154-162,February 2020 https://doi.org/10.13374/j.issn2095-9389.2019.02.24.004;http://cje.ustb.edu.cn 磁场形式及参数对单纤维捕集钢铁行业粉尘中 PM25性能影响 张俪安，刁永发四，庄加玮，周发山，沈恒根 东华大学环境科学与工程学院，上海201620 通信作者，E-mail:diaoyongfa@dhu.edu.cn 摘要目前钢铁行业已成为大气污染防治的重点，为解决现有钢铁行业对于PM2:细颗粒难以捕集的雄题，实现粉尘的超 低排放.基于CFD-DPM(computational fluid dynamics-.discrete phase model)方法对磁性纤维产生的磁场以及高梯度磁场等不同 磁场形式下单纤维对钢铁行业捕集PM2性能的影响进行研究，通过X射线衍射图谱分析可知钢铁行业生产过程产生的粉 尘因含有F©3O4以及单质Fe而具有磁特性，进而提出了利用磁场来增强单纤维捕集PM2s性能的方法.计算结果表明，在运 动轨迹方面，磁性纤维产生的磁场会在纤维周围形成引力区，高梯度磁场会在纤维周围形成2个引力区和2个斥力区：在捕 集性能方面，当粉尘粒径d,为0.5~1.0um,入口风速v≤0.2ms时，高梯度磁场下磁性纤维的捕集能力要强于单一磁性纤维 的捕集能力，若磁场强度H=0.5T,磁感应强度B=0.01T,1=0.1ms,高梯度磁场可以使单纤维的捕集效率提高为传统单纤维 捕集的28.32倍，若B=0.01T,1=0.1ms.磁性纤维产生的磁场可以使捕集效率提高为传统单纤维捕集的4.037倍：在磁性纤 维产生的磁场中，当磁感应强度B≥0.03T时，磁性单纤维对PM2、的捕集效率随着入口风速的增加而减小，后趋于稳定，当 B<0.03T时，捕集效率随入口风速逐渐减小；捕集效率随粉尘粒径的增加而增大.而对于高梯度磁场，单纤维对PM25捕集效 率同样随着入口风速的增加而减小.当>0.4ms时，捕集效率为0.B越大.捕集效率下降越快：捕集效率随着粉尘粒径增大 呈现先增加后减小的趋势. 关键词磁性纤维；高梯度磁场：PM25;铁磁性；捕集性能 分类号TF701.3 Performance of single fiber collection PM25 under different magnetic field forms in the iron and steel industry ZHANG Li-an,DIAO Yong-fa,ZHUANG Jia-wei.ZHOU Fa-shan,SHEN Heng-gen School of Environmental Science and Engineering College,Dong Hua University,Shanghai 201620,China Corresponding author,E-mail:diaoyongfa@dhu.edu.cn ABSTRACT At present,the steel industry has become the focus of air pollution prevention and control.To solve the difficulty in collecting PM2s fine particles and achieving ultra-low emission of dust,based on the method of computational fluid dynamics-discrete phase model (CFD-DPM),the influence of different magnetic field forms,such as magnetic field generated by magnetic fiber and high- gradient magnetic field,on the performance of PM2s collection in the iron and steel industry was studied.Through X-ray diffraction (XRD)analysis,it was found out that the dust produced in the iron and steel industry production process has magnetic characteristics due to the presence of FeO and elemental Fe,furthermore,the method of using magnetic field to enhance the PM2s collection performance of single fiber was proposed.The results show that the magnetic field generated by the magnetic fiber will form a gravitational region 收稿日期：2019-02-24 基金项目：国家重点研发计划资助项目(2018YFC0705300):中央高校基本科研业务费重点资助项目(2232017A-09)磁场形式及参数对单纤维捕集钢铁行业粉尘中 PM2.5 性能影响 张俪安，刁永发苣，庄加玮，周发山，沈恒根 东华大学环境科学与工程学院，上海 201620 苣通信作者，E-mail: diaoyongfa@dhu.edu.cn 摘    要    目前钢铁行业已成为大气污染防治的重点，为解决现有钢铁行业对于 PM2.5 细颗粒难以捕集的难题，实现粉尘的超 低排放. 基于 CFD-DPM（computational fluid dynamics-discrete phase model）方法对磁性纤维产生的磁场以及高梯度磁场等不同 磁场形式下单纤维对钢铁行业捕集 PM2.5 性能的影响进行研究，通过 X 射线衍射图谱分析可知钢铁行业生产过程产生的粉 尘因含有 Fe3O4 以及单质 Fe 而具有磁特性，进而提出了利用磁场来增强单纤维捕集 PM2.5 性能的方法. 计算结果表明，在运 动轨迹方面，磁性纤维产生的磁场会在纤维周围形成引力区，高梯度磁场会在纤维周围形成 2 个引力区和 2 个斥力区；在捕 集性能方面，当粉尘粒径 dp 为 0.5～1.0 μm，入口风速 v≤0.2 m·s−1 时，高梯度磁场下磁性纤维的捕集能力要强于单一磁性纤维 的捕集能力，若磁场强度 H=0.5 T，磁感应强度 B=0.01 T，v=0.1 m·s−1，高梯度磁场可以使单纤维的捕集效率提高为传统单纤维 捕集的 28.32 倍，若 B=0.01 T，v=0.1 m·s−1，磁性纤维产生的磁场可以使捕集效率提高为传统单纤维捕集的 4.037 倍；在磁性纤 维产生的磁场中，当磁感应强度 B≥0.03 T 时，磁性单纤维对 PM2.5 的捕集效率随着入口风速的增加而减小，后趋于稳定，当 B<0.03 T 时，捕集效率随入口风速逐渐减小；捕集效率随粉尘粒径的增加而增大. 而对于高梯度磁场，单纤维对 PM2.5 捕集效 率同样随着入口风速的增加而减小，当 v>0.4 m·s−1 时，捕集效率为 0，B 越大，捕集效率下降越快；捕集效率随着粉尘粒径增大 呈现先增加后减小的趋势. 关键词    磁性纤维；高梯度磁场；PM2.5；铁磁性；捕集性能 分类号    TF701.3 Performance of single fiber collection PM2.5 under different magnetic field forms in the iron and steel industry ZHANG Li-an，DIAO Yong-fa苣 ，ZHUANG Jia-wei，ZHOU Fa-shan，SHEN Heng-gen School of Environmental Science and Engineering College, Dong Hua University, Shanghai 201620, China 苣 Corresponding author, E-mail: diaoyongfa@dhu.edu.cn ABSTRACT    At present, the steel industry has become the focus of air pollution prevention and control. To solve the difficulty in collecting PM2.5 fine particles and achieving ultra-low emission of dust, based on the method of computational fluid dynamics-discrete phase model (CFD-DPM), the influence of different magnetic field forms, such as magnetic field generated by magnetic fiber and high￾gradient magnetic field, on the performance of PM2.5 collection in the iron and steel industry was studied. Through X-ray diffraction (XRD) analysis, it was found out that the dust produced in the iron and steel industry production process has magnetic characteristics due to the presence of Fe3O4 and elemental Fe, furthermore, the method of using magnetic field to enhance the PM2.5 collection performance of single fiber was proposed. The results show that the magnetic field generated by the magnetic fiber will form a gravitational region 收稿日期: 2019−02−24 基金项目: 国家重点研发计划资助项目（2018YFC0705300）；中央高校基本科研业务费重点资助项目（2232017A-09） 工程科学学报，第 42 卷，第 2 期：154−162，2020 年 2 月 Chinese Journal of Engineering, Vol. 42, No. 2: 154−162, February 2020 https://doi.org/10.13374/j.issn2095-9389.2019.02.24.004; http://cje.ustb.edu.cn