Solid/liquid — gas separation with wet scrubbers and wet electrostatic precipitators: A review

doi:10.1016/s0015-1882(00)88897-7

Cited by 7 publications

(1 citation statement)

References 14 publications

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“…Previous relevant work shows that the studies on particle collection involving Stefan flow mostly focus on the removal of aerosol particles by raindrops or ice crystals in the atmosphere and by wet scrubbers in the industrial field. ,− In these research directions, condensation or evaporation will occur and influence the particle collection; therefore, Stefan flow cannot be ignored. Stefan flow caused by evaporation can push the particles away from the phase interface, and Stefan flow caused by condensation drags the particles close to the phase interface.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Stefan Flow in the Collection of Particles on Evaporating/Condensing Surfaces: A Review

Gan

Zhang

Nie

et al. 2021

Ind. Eng. Chem. Res.

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Evaporation and condensation are important in the field of heat and mass transfer. Particle collection by an evaporating or condensing surface is an interesting phenomenon. The Stefan flow generated on the phase change surface has a significant effect on the movement of particles. The transport mechanism of Stefan flow in previous studies lacks a systematic review. This study introduces the Stefan flow mechanism in particle collection, and the different theoretical models of particle collection are systematically summarized. The differences between the theoretical calculation and the experimental results of the effect of the phoretic forces (thermophoresis and Stefan flow) in particle collection on evaporating/condensing surfaces are pointed out. The variations are discussed from the viewpoint of Stefan flow. This study also emphasizes that Stefan flow on the condensing surface may become an important mechanism to further improve the particle collection efficiency.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Stefan Flow in the Collection of Particles on Evaporating/Condensing Surfaces: A Review

Gan

Zhang

Nie

et al. 2021

Ind. Eng. Chem. Res.

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Modeling of Gravitational Wet Scrubbers with Electrostatic Enhancement

Zhao

Chen

2008

Chem Eng & Technol

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Conventional gravitational wet scrubbers, which generally perform removal of fine particles with low efficiency, cannot meet new standards for pollution emissions. One way of improving the collection efficiency of fine particles is to impose additional electrostatic forces upon particles by means of particle-charging, or droplet-charging, or even opposite-charging of particles and droplets. A Monte Carlo method for population balance modeling is presented to describe the particle removal processes of gravitational wet scrubbers with electrostatic enhancement, in such a way that the grade collection efficiency and particle size distribution are calculated quantitatively. Numerical results show that, the grade collection efficiency of submicron particles is only ca. 5 % in conventional wet scrubbers. However, it reaches ca. 25 % in particle-charging wet scrubbers, ca. 70 % in droplet-charging wet scrubbers, and even above 99 % in opposite-charging wet scrubbers. Furthermore, population balance modeling is used to optimize the operational parameters of the droplet-charging wet scrubbers by means of the quantitative comparison of the grade collection efficiency. It is found that the operational parameters that are beneficial to the high-efficiency removal of fine particles are faster gas velocity, slower droplet velocity, larger liquid-to-gas flow ratio, larger charge-to-mass ratio of droplets, smaller geometric mean diameter and smaller geometric standard deviation of droplets.

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Theoretical model and preliminary design of an innovative wet scrubber for the separation of fine particulate matter produced by biomass combustion in small size boilers

Bianchini

Pellegrini

Rossi

et al. 2018

Biomass and Bioenergy

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Solid/liquid — gas separation with wet scrubbers and wet electrostatic precipitators: A review

Cited by 7 publications

References 14 publications

Mechanism of Stefan Flow in the Collection of Particles on Evaporating/Condensing Surfaces: A Review

Mechanism of Stefan Flow in the Collection of Particles on Evaporating/Condensing Surfaces: A Review

Modeling of Gravitational Wet Scrubbers with Electrostatic Enhancement

Theoretical model and preliminary design of an innovative wet scrubber for the separation of fine particulate matter produced by biomass combustion in small size boilers

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