Compositional penetration of pulverized coal combustion fly ash through the electrostatic precipitator

Lind, Tm; Kauppinen, Esko I.; Valmari, T; Klippel, Norbert; Mauritzson, Christer

doi:10.1016/0021-8502(95)96914-s

Cited by 3 publications

(4 citation statements)

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“…This particle size dependent penetration through the ESP during pulverized coal combustion has been investigated. [20][21][22] Furthermore, composition dependent selective penetration, where particles of the same size but with different composition, show different degrees of penetration, was also reported. 6,7 In one study a South African coal was used to fire a power plant equipped with a highly efficient ESP.…”

Section: Introductionmentioning

confidence: 99%

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Fly Ash Penetration through Electrostatic Precipitator and Flue Gas Condenser in a 6 MW Biomass Fired Boiler

et al. 2002

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The effects of an electrostatic precipitator and a flue gas condenser on size resolved fly ash particle concentration and composition were studied in a 6 MW biomass combustion unit, fired with moist forest residue. The boiler was of moving grate type. The fly ash particles were sampled upstream and downstream of the electrostatic precipitator and flue gas condenser, respectively. Fine particle number size distributions were measured using an electric mobility spectrometer (SMPS) and coarse particle number size distributions were measured using a time-of-flight instrument (APS). The mass size distributions were measured using a multi-jet low pressure cascade impactor (DLPI). For chemical analyses of the impactor substrates particle induced X-ray emission analysis (PIXE) was used. After the flue gas passed the electrostatic precipitator (ESP), the fly ash particle concentration was reduced by approximately 96% by number and 83% by mass. After the particles passed the flue gas condenser, particle number concentration was only marginally altered, whereas the mass concentration was reduced by half. Both the ESP and the condenser showed, size dependent particle separation efficiency. The main elements (Z > 12) in the fine fly ash fraction were K, S, and Cl, whereas the main elements in the coarse fraction were Ca, K, S, and Cl. After passing the ESP the mass ratio of Ca decreased in the coarse fraction, while the ratios of K, S, and Cl increased, indicating transference of fly ash material from the fine to the coarse particle fraction. There was no significant difference in the elemental composition for any particle size fraction sampled upstream or downstream of the condenser.

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Section: Introductionmentioning

confidence: 99%

“…Since the efficiency for particle removal by the ESP is size dependent, the total fly ash will be enriched in components more abundant in the size fractions that are less effectively separated. This particle size dependent penetration through the ESP during pulverized coal combustion has been investigated. − …”

Section: Introductionmentioning

confidence: 99%

Fly Ash Penetration through Electrostatic Precipitator and Flue Gas Condenser in a 6 MW Biomass Fired Boiler

et al. 2002

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“…Either an electrostatic precipitator (ESP) or fabric filter (FF) would be employed. A search of the literature for ESP efficiencies shows that in all cases the least efficient collection is when the particle size is in the 0.1-1 lm range [42][43][44][45][46], which is the very range identified here. For fabric filters, the result is similar, as the 0.1-1 range falls between two effects which determine FF performance i.e.…”

Section: The Effect Of Gas Cleaning On Aerosol Removalmentioning

confidence: 76%

The Formation of Aerosols During the Co-combustion of Coal and Biomass

Nzihou

Stanmore

2015

Waste Biomass Valor

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The global drive to lessen the emission of greenhouse gases in the power industry has seen an increase in the co-combustion of coal with various types of biomass. The practice ''represent possibly the best (cheapest and lowest risk) renewable energy option for many power producers''. Most reviews of the practice cite environmental benefits coupled with satisfactory technological performance. One environmental aspect which has been virtually ignored is the formation and release of ultrafine aerosol particles, which have a damaging effect on the respiratory system. The emission of respirable aerosols during the combustion of both coal and biomass has received considerable attention, but there is little information available for the combustion of their mixture. The available evidence, reviewed here, indicates that the extent of their formation is increased by co-combustion, due to the high ash and sulphur content of coals, and the high alkali metal content of biomass.

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“…This U-shape collection efficiency curve has been verified in many experimental (11,(16)(17)(18) and theoretical (12) studies. Furthermore, the collection efficiency of an ESP is dependent also on the elemental composition of particles (19,20). Although the mass collection efficiency can exceed 99%, penetration of submicrometer particles easily reaches tens of percent when calculated in terms of number concentrations (13,14).…”

Section: Introductionmentioning

confidence: 99%

Particle Collection Efficiency and Particle Re-entrainment of an Electrostatic Precipitator in a Sewage Sludge Incineration Plant

Ferge

Maguhn

Felber

et al. 2004

Environ. Sci. Technol.

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In several recent studies it was shown that high atmospheric loads of submicrometer particles in the size range below 500 nm have strong impact on human health. Therefore, extensive research concerning the reduction of fine particle emissions is needed to further improve air quality. Regarding health effects, especially the emission characteristics of fine and ultrafine particles emerging from anthropogenic sources such as combustion processes are of special interest. This study shows that the emission characteristic of an electrostatic precipitator (ESP) due to re-entrainment of fine particles and their subsequent release into the atmosphere can be significantly lowered by application of different operating conditions. For this purpose the particle collection efficiency of an ESP was studied in a municipal sewage sludge incineration plant. Particles were sampled under different operating conditions upstream and downstream from the ESP, and the particle number concentrations were measured simultaneously with aerodynamic particle sizers. In addition, the size distribution of the particles downstream from the ESP was measured with high time resolution by an electrical low-pressure impactor to investigate the particle re-entrainment into the flue gas. To determine the influence of operating conditions, different rapping cycles were investigated regarding their impact on the collection efficiency and the subsequent particle re-entrainment.

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Compositional penetration of pulverized coal combustion fly ash through the electrostatic precipitator

Cited by 3 publications

References 0 publications

Fly Ash Penetration through Electrostatic Precipitator and Flue Gas Condenser in a 6 MW Biomass Fired Boiler

Fly Ash Penetration through Electrostatic Precipitator and Flue Gas Condenser in a 6 MW Biomass Fired Boiler

The Formation of Aerosols During the Co-combustion of Coal and Biomass

Particle Collection Efficiency and Particle Re-entrainment of an Electrostatic Precipitator in a Sewage Sludge Incineration Plant

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