Experimental investigation on removal of coal-fired fine particles by a condensation scrubber

Fan, Fei; Yang, Linjun; Yan, Jun; Bao, Jianchun; Shen, Xiangqian

doi:10.1016/j.cep.2009.06.011

Cited by 57 publications

(21 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In industrial and practical processes, although some particle abatement devices are designed to remove the particles, they are far less efficient in sub-micron particles collection. The removal efficiency of traditional abatement systems decreases to approximately 25% (Fan et al 2009;Bao et al 2012;De Joannon et al 2013). Pretreatment measures are used to enlarge fine particles and improve the removal efficiency of these traditional devices (Jaworek et al 2006;Hering and Stolzenburg 2005).…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous condensation process observed by environmental scanning electron microscopy (ESEM): On smooth single aerosol particle

Zhang

et al. 2020

Aerosol Science and Technology

View full text Add to dashboard Cite

Heterogeneous condensation of water vapor on the aerosol particles is a very important phenomenon in natural and industrial processes such as the formation of cloud droplets, the measurement of aerosol number concentrations and particulate abatement. In the present work, a mixed surface is created, where the hydrophilic SiO 2 particles are dispersed on the super-hydrophobic substrate. The direct visualization of the heterogeneous condensation process on a smooth spherical single particle is realized by adopting an Environmental Scanning Electron Microscopy (ESEM) system. The time-resolved images captured by ESEM show that only one embryo drop formed at a random position of the particle surface, and the single particle could be gradually contained with the formation of an embryo drop, the enlargement of the spherical-cap shaped drop and the spherical drop. A physical model of heterogeneous condensation is established, and in good agreement with Fletcher's classical nucleation model. Meanwhile, the growth rate of a droplet is obtained experimentally based on the time-resolved images. Then the condensational growth of the droplet is numerically predicted by Kulmala's equations and the numerical results agree well with the experimental data. The growth rate of a droplet decreases with the increase of the droplet size. Finally Lee's condensation mechanisms and the concept of surface free energy are presented to explain the decrease of the growth rate of the droplet.

show abstract

Section: Introductionmentioning

confidence: 99%

Heterogeneous condensation process observed by environmental scanning electron microscopy (ESEM): On smooth single aerosol particle

Zhang

et al. 2020

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

“…Heterogeneous condensation has drawn growing attention from researchers in different areas of chemical engineering, e.g., crystal formation, material processing, and gas cleaning technology, particularly, in the abatement of particulate matters (PM) suspended in the flue gas. PM with a diameter D p ≤ 10 μm, namely PM 10 , are considered inhalable and dangerous.…”

Section: Introductionmentioning

confidence: 99%

“…The enlarged particles can be captured using conventional particulate removal devices. Extensive experiments have been conducted previously focusing on the influence of operating conditions on the particle removal efficiency in condensation scrubbers and various wet flue gas desulphurization systems, and under the combined effect of heterogeneous condensation with acoustic agglomeration . These studies have demonstrated that heterogeneous condensation is a promising method to promoting the removal of PM.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of heterogeneous nucleation of water vapour on PM₁₀ for particulate abatement

et al. 2018

Self Cite

View full text Add to dashboard Cite

A heterogeneous nucleation model with inclusions of the line tension effect, the particle roughness effect, and the surface diffusion mechanism was presented. Effects of the particle roughness and the wetting agent on the heterogeneous nucleation behaviour were examined. The scaled nucleation barrier was analyzed and subsequently implications of the nucleation behaviour in the particulate abatement by vapour condensation were discussed. It was found that the effect of particle roughness on the nucleation behaviour was greatly affected by the line tension. There existed an optimal concentration of wetting agent at which the lowest nucleation barrier and critical saturation ratio could be obtained. The surface diffusion mechanism played an overwhelmingly important role in governing the embryo growth for hydrophilic particles with a diameter D p > 0.1 mm and an embryo size smaller than the critical size, otherwise the contribution of direct vapour deposition mechanism could be significant. Based on the scaled nucleation barrier, three distinct nucleation regimes, i.e. athermal heterogeneous nucleation, thermal heterogeneous-dominant nucleation, and homogeneous-dominant nucleation, have been identified. When the contact angle was large, the wetting agent might need to be added to reduce the contact angle so as to reach the athermal heterogeneous and thermal heterogeneousdominant nucleation regimes, thus achieving efficient particulate abatement at low cost. The prediction results matched reasonably with the experimental data.

show abstract

“…However, the scavenging coefficients of AP with the diameter between 0.1 and 2.5 um are still limited in theory. Vapor condensation has been proposed as one of the most promising techniques to promote AP collision, growth, and deposition [5,6] . However, these methods cannot be directly applied due to the limitation of the experiment technique.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Wet Removal Properties of Superfine Aerosol Particles

Li¹,

Zhao²,

Wang³

et al. 2017

dtetr

View full text Add to dashboard Cite

Wet removal efficiency of aerosol particles (AP) are investigated in this paper, three main theory models of AP coalescence, water droplets (WD) capture, and supersaturated vapor phase are introduced. Grade removal efficiency (GRE) versus AP diameter is numerical obtained and compared with experimental data only under the WD capture. Then, the influence of WD diameter on GRE is examined. Simulation results show that GRE can be effectively improved with decreasing WD diameter especially for AP in the 0.1-2.5um diameter range. Furthermore, the removal rate under three mechanisms is increased greatly. Therefore, taking advantage of multiple mechanisms and exploring the proper wet removal technical will provide the guide for the future application.

show abstract

Experimental investigation on removal of coal-fired fine particles by a condensation scrubber

Cited by 57 publications

References 14 publications

Heterogeneous condensation process observed by environmental scanning electron microscopy (ESEM): On smooth single aerosol particle

Heterogeneous condensation process observed by environmental scanning electron microscopy (ESEM): On smooth single aerosol particle

Numerical investigation of heterogeneous nucleation of water vapour on PM₁₀ for particulate abatement

Numerical Investigation on Wet Removal Properties of Superfine Aerosol Particles

Contact Info

Product

Resources

About

Experimental investigation on removal of coal-fired fine particles by a condensation scrubber

Cited by 57 publications

References 14 publications

Heterogeneous condensation process observed by environmental scanning electron microscopy (ESEM): On smooth single aerosol particle

Heterogeneous condensation process observed by environmental scanning electron microscopy (ESEM): On smooth single aerosol particle

Numerical investigation of heterogeneous nucleation of water vapour on PM10 for particulate abatement

Numerical Investigation on Wet Removal Properties of Superfine Aerosol Particles

Contact Info

Product

Resources

About

Numerical investigation of heterogeneous nucleation of water vapour on PM₁₀ for particulate abatement