Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, People's Republic of China.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, People's Republic of China.
Environ Res. 2019 Feb;169:173-179. doi: 10.1016/j.envres.2018.11.010. Epub 2018 Nov 9.
The emission of fine particles from coal-fired power plants is one of the major healthy and environmental concerns. The enlargement of particles seems to be a promising pretreatment technology due to the low removal efficiency of traditional dusting devices. The study of particle amplification by heterogeneous condensation of magnetized water vapor was carried out based on the growth tube. And, the major component of particles from coal combustion SiO was tested. The experimental results indicate that the particle growth is more favored by the magnetized water compared with non-magnetized water. And the particle growth is closely related to the magnetic field strength. Additionally, the surface tension of magnetized water is reduced and the wettability of particle surface is improved to some extent. Meanwhile, the particle concentration has stronger effect on the particle growth with magnetized water at lower level of supersaturation. Numerical calculation results demonstrate that the critical supersaturation is lower and nucleation rate is elevated when the water magnetized. This work reveals the facilitating process of particle growth by magnetized water that is the physical method of ameliorating particle surface performance.
燃煤电厂细颗粒物的排放是健康和环境的主要关注点之一。由于传统除尘设备的去除效率较低，颗粒的放大似乎是一种很有前途的预处理技术。基于生长管研究了磁化水蒸气非均相冷凝促进颗粒放大的过程，并对煤燃烧产生的主要颗粒成分 SiO 进行了测试。实验结果表明，与非磁化水相比，磁化水更有利于颗粒生长。而且，颗粒生长与磁场强度密切相关。此外，磁化水的表面张力降低，颗粒表面的润湿性在一定程度上得到改善。同时，在较低过饱和度下，颗粒浓度对磁化水的颗粒生长有更强的影响。数值计算结果表明，水被磁化时，临界过饱和度降低，成核速率提高。这项工作揭示了磁化水促进颗粒生长的促进过程，这是改善颗粒表面性能的物理方法。
