Numerical investigation of PM2.5 size enlargement by heterogeneous condensation for particulate abatement

Fan, Fei; Zhang, Sihong; Wang, Wenying; Yan, Jun; Su, Mingxu

doi:10.1016/j.psep.2019.03.018

Cited by 39 publications

(15 citation statements)

References 43 publications

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“…When the cluster size is larger than the critical embryo size, the cluster growth will be into the transition stage. In this stage, the direct addition of water molecules from the vapor and surface diffusion of adsorbed water molecules on the particle are both considered. , Additionally, the spherical cap shaped cluster B g forms on the surface of the particle, and the growth rate of clusters d r /d t can be approximately described by the following formula. where V L denotes the volume of one water molecule, r g is the cluster radius containing g molecules, and ψ g is half of the central angles of B g . Ke g is the g -cluster’s Kelvin number defined as Ke g = 2σ V L /( k B Tr g ).…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…Ke g is the g -cluster’s Kelvin number defined as Ke g = 2σ V L /( k B Tr g ). C g sat is the condensation coefficient. , where C g (α) and C g (β) denote the condensation coefficient in both mechanism of direct addition and surface diffusion, respectively. where δ is the mean jump distance of one water molecule, ν is the vibrational frequency of the adsorbed molecule, and Δ G diff is the surface diffusion energy per water molecule. The surface concentration of water molecules n is described as follows: where Δ G des is the desorption free energy per water molecule.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…In this stage, the direct addition of water molecules from the vapor and surface diffusion of adsorbed water molecules on the particle are both considered. 27,29 Additionally, the spherical cap shaped cluster B g forms on the surface of the particle, and the growth rate of clusters dr/dt can be approximately described by the following formula.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

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Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Zhang

et al. 2019

Energy Fuels

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The emission of fine particles from coal-fired power plants causing environmental and human health issues is a topic of concern. The enlargement of particles seems to be a promising pretreatment technology for fine particles removal with traditional electrostatic precipitator. The effects of magnetized Tween-20 solution (MTS) by heterogeneous condensation for particle growth were carried out based on the growth tube. The experimental results indicate that the particle growth is more favored by MTS compared with water and nonmagnetized solution. Additionally, the surface tension of magnetized solution is decreased, and the wettability of particles is improved. Furthermore, more effective particle growth is presented at lower mass concentration of MTS. Meanwhile, the initial particle concentration has great influence on the larger size grown particles on magnetized solution. Numerical calculation results demonstrate that the critical supersaturation is lower, but the nucleation rate in the nucleation stage and the growth rate of clusters in the transition stage are both elevated on the condition of magnetized solution. This work reveals that the facilitating process of particle growth by magnetized wetting agent solution is a potential physical and chemical method.

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Section: Theoretical Frameworkmentioning

confidence: 99%

Section: Theoretical Frameworkmentioning

confidence: 99%

Section: Theoretical Frameworkmentioning

confidence: 99%

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Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Zhang

et al. 2019

Energy Fuels

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“…Thus, increased research attention is being focused toward development of preconditioning technologies to enlarge PM 2.5 particles. Preconditioning technologies presently under development include acoustic agglomeration (Fan, Yang, and Kim 2013;Fan et al 2017;Hoffmann 2000;Sheng and Shen 2007;Shang et al 2018), electrical agglomeration (Chang et al 2017), magnetic agglomeration (Huang et al 2015;Zhao et al 2007), and heterogeneous condensation (Fan et al 2009a(Fan et al , 2009b(Fan et al , 2019a(Fan et al , 2019bSmith, Shaviv, and Svensmark 2016). Among these, acoustic agglomeration has attracted the greatest interest from researchers owing to its simple installation and ease of adaptation.…”

Section: Introductionmentioning

confidence: 99%

Modeling of particle interaction dynamics in standing wave acoustic field

Fan

Zhang

et al. 2019

Aerosol Science and Technology

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Interactions between fine particles (PM 2.5 ) suspended in flue gas can be promoted via application of acoustic fields. This may lead to particle collision and agglomeration, thereby facilitating possible realization of PM 2.5 abatement. The dynamic behavior of particle interactions in standing wave acoustic fields, however, is not well understood, and this severely restricts the development of practical acoustic agglomeration devices. Availability of limited information concerning PM 2.5 interactions, insufficient consideration of interaction mechanisms, and neglect of spatial variation in acoustic velocity under the standing wave condition are a few limitations of previous studies performed in this regard. To address these concerns, a theoretical model capable of accurately describing the interaction between two neighboring particles in a standing wave acoustic field was developed in this study. Experimentally obtained parameters, such as particle velocity due to acoustic entrainment, interaction pattern, and collision time, were reproduced via numerical simulations performed using the proposed model. Additionally, the influences of model improvements on PM 2.5 interaction dynamics were analyzed. Finally, the proposed model was adopted to investigate the effect of particle size on collision time. Results demonstrate that in cases involving identically sized particles, the collision time significantly reduces with increase in particle size. Maintaining the size of a particle constant whilst increasing that of the other particle causes the collision time to decrease. This is coupled with reduction in initial orientation angle range corresponding to particle collision. Consequently, no collisions occur when a substantial difference exists between particle sizes.

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“…Однако предельные возможности ультразвукового воздействия при коагуляции частиц размером менее 2,5 мкм до настоящего времени экспериментально не определены. Это не позволяет реализовывать конструкции ультразвуковых коагуляторов с максимальной эффективностью и не дает возможности выявлять пути решения проблемы повышения эффективности УЗ коагуляции мелких частиц [1][2][3]. Для исследования процесса ультразвуковой коагуляции тонкодисперсных частиц был создан стенд, реализующий различные условия воздействия ультразвуковыми колебаниями.…”

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Development and research of a new method of gas cleaning from particles less than 2.5 micron in size

Khmelev¹,

Shalunov²,

Nesterov³

et al. 2021

Proceedings of the International Scientific and Technical Symposium «Improving Energy and Resource Efficiency and Environmental

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Research was been carried out to develop a new method and device for gas cleaning from particles less than 2.5 µm in size by increasing the time of ultrasonic exposure to each particle and creating zones of local increase in the concentration of submicron particles. This was ensured by the formation of vortex flows between the disk flexural-oscillating radiator and the reflector. A local zone of increased concentration of particles w formed in the peripheral region of the vortex, due to the drift of particles under the action of centrifugal particles from the central region of the vortex to its periphery. This method increases the efficiency from 13% to 50% depending on the concentration of the particles.

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Numerical investigation of PM2.5 size enlargement by heterogeneous condensation for particulate abatement

Cited by 39 publications

References 43 publications

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Modeling of particle interaction dynamics in standing wave acoustic field

Development and research of a new method of gas cleaning from particles less than 2.5 micron in size

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Numerical investigation of PM2.5 size enlargement by heterogeneous condensation for particulate abatement

Cited by 39 publications

References 43 publications

Condensational Growth of Fine SiO2 Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Condensational Growth of Fine SiO2 Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Modeling of particle interaction dynamics in standing wave acoustic field

Development and research of a new method of gas cleaning from particles less than 2.5 micron in size

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Product

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Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor

Condensational Growth of Fine SiO₂ Particles by Magnetized Wetting Agent Tween-20 Solution Vapor