Removal of fine particles in coal fired power plant by chemical coagulation

Individual particles from the fine fraction of samples of entrained ash from a coal-burning power plant were analyzed using an automated scanning electron microscope with an energydispersive x-ray spectrometer. The particles were of concern as a probable cause of high levels of opacity in the plant emissions. Both the mass loading and the number size distribution of fine particles peak in the size range of 0.4 to 0.8 μm diameter.Most of the fine particles are Na-, S-, P-, or Cl-rich. The coal is likely to be the major source for these particles. Minerals and organically-associated metals in the coal can remain in the solid phase during combustion, forming ash particles of varied sizes, including those in the submicron range. Elements are also vaporized during combustion, and Na- and S-bearing particles may form when gas-phase Na2SO4 condenses homogeneously in the convective pass of the boiler. Phosphate and chloride particles may also condense homogeneously.

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06/02434 Morphology and chemistry of fine particles emitted from a Canadian coal-fired power plant

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(06)82442-2 ◽

2006 ◽

Vol 47 (5) ◽

pp. 368

Keyword(s):

Power Plant ◽

Fine Particles

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Agglomeration of ultra-fine particles from flue gas in coal-fired power plant using polymeric flocculants

Proceedings of the 2016 International Conference on Civil, Structure and Environmental Engineering ◽

10.2991/i3csee-16.2016.29 ◽

2016 ◽

Author(s):

Yi Zhang ◽

Kunqi Li ◽

Haoran Chen ◽

Yuanfeng Pan ◽

Huining Xiao ◽

...

Keyword(s):

Power Plant ◽

Flue Gas ◽

Fine Particles ◽

Ultra Fine Particles

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An Analytical Modeling Approach for Performance Evaluation of Electrostatic Precipitator (ESP)

Journal of Energy and Safety Technology (JEST) ◽

10.11113/jest.v1n2-2.33 ◽

2019 ◽

Vol 1 (2-2) ◽

Author(s):

Shanti Faridah Salleh ◽

Afrasyab Khan ◽

Cirilo Nolasco Hipolito ◽

Lennevey Kinidi ◽

Dayang Siti Herdawati Abang Hardin

Keyword(s):

Performance Evaluation ◽

Power Plant ◽

Flue Gas ◽

Analytical Modeling ◽

Fine Particles ◽

Electrostatic Precipitator ◽

Flow Rates ◽

Overall Performance ◽

High Concentrations ◽

Migration Velocities

A coal-fired flue gas contains high concentrations of fine particles which can pose a threat to the environment. In this study, an electrostatic precipitator is used to remove the fine particles of the flue gas from a 100MW coal fired power plant by using a model. A model has been presented to estimate the performance of the wet electrostatic precipitator (WEP) in terms of the number of plates, flow rates and velocity. The equations have been specified for the charging and charge on the single particle of some definite diameter. The effect of the measuring points for the calculation of the effective migration velocities and hence overall performance along with the re-entrainment and gas sneakage have been incorporated. Ranges for the above-mentioned parameters are well defined and it has been observed that after a certain range values across number of plates, velocities and flow rates there is no significant improvement in the performance of the WEP has been calculated.

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TEM study of fine particles from coal-fired power plant ambient air

World Journal of Engineering ◽

10.1108/wje-08-2016-042 ◽

2016 ◽

Vol 13 (4) ◽

pp. 311-316 ◽

Cited By ~ 5

Author(s):

Wei Pian ◽

Wenjing Cheng ◽

Hongya Niu ◽

Jingsen Fan

Keyword(s):

Power Plant ◽

Power Plants ◽

Fine Particles ◽

Scientific Information ◽

Ambient Air ◽

Submicron Particles ◽

Spherical Particles ◽

Particle Analysis ◽

Content Type ◽

Inhalable Particles

Purpose This study aims to focus on the submicron particles (with diameter of 0.2-1.0 μm) of the ambient air from a coal-fired power plant. A systematic examination of their morphology, particle size and chemical element will be analyzed, so as to provide more scientific information and theoretical basis for the formation and control method of inhalable particles, as well as data support for environmental impact and ecological effects assessments. Design/methodology/approach In this paper, the morphology, size distribution and elemental characteristics of submicron particles from ambient air of a coal-fired power plant are studied by single particle analysis. Findings The results show that atmospheric particles in coal-fired power plant are mainly spherical particles, and most of them are soot aggregates adhered or coated with other particles with few rectangle particles. The particles collected in the afternoon and evening are mainly of spherical particles, and small-sized particles collected in the morning are mainly spherical ones, while the overall concentration is larger than that of the spherical particles in the size range above 0.5 μm. The results indicated that the larger-sized spherical particles have a lower concentration. Originality/value Coal-fired power plants are still the main supply of electricity in China, but the inhalable particles, especially sub-micron particles (0.1-1.0 μm) cannot be effectively captured by the dust removal device from the coal-fired power plant. Thus, a large amount of inhalable particles is emitted into the atmosphere, becoming the major air pollutants in China.

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