Trace elements in fly ash. Dependence of concentration on particle size

Davison, Richard L.; Natusch, D. F. S.; Wallace, John R.; Evans, C. A.

doi:10.1021/es60098a003

Cited by 657 publications

(344 citation statements)

References 12 publications

(14 reference statements)

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“…Davison et al (1974) reported a definite trace-element trend with decreasing particle size in fly ash collected from a power plant burning southern Indiana coal. Volatile species such as As, Ni, and Cd all showed an increasing mass fraction with decreasing particle size, and a mechanism of preferential condensation on small particles was proposed to explain the data.…”

Section: Field Studiesmentioning

confidence: 99%

Effect of Coal Type and Residence Time on the Submicron Aerosol Distribution from Pulverized Coal Combustion

Linak

Peterson

1984

Aerosol Science and Technology

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Three types of pulverized coal were burned in a laboratory furnace under various combustion configurations. Pulverized samples of Utah bituminous, Beulah (North Dakota) lignite, and Texas lignite coals were burned at a rate of 2.5 kg/hr in a laboratory furnace. Aerosol sue distributions were measured at various positions within the convection section, and temperature and gas compositions were measured throughout. The evolution of the submicron particle size distribution within the convection section for the three coals was similar, although the location of the initial particle mode at the convection section inlet varied with coal type. While staged combustion of Utah bituminous coal had a variable effect on the volume of submicron aerosol produced, staged combustion of the lignites caused a definite increase in the submicron aerosol volume. Vapor enhancement due to a localized reducing atmosphere, yhich would effect coals of higher ash volatility, is thought to explain this behavior.

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Section: Field Studiesmentioning

confidence: 99%

Effect of Coal Type and Residence Time on the Submicron Aerosol Distribution from Pulverized Coal Combustion

Linak

Peterson

1984

Aerosol Science and Technology

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“…Of these wastes, especially the fly ashes, cling to the surface of the elements [1][2][3]. These toxic pollutants can leach out and contaminate soils, as well as surface water and groundwater [2,[4][5][6][7][8][9][10][11][12]. Fluidized bed combustion technology is a clean and effective technology to burn coals with high sulphur and ash contents, but with low calorific values.…”

Section: Introductionmentioning

confidence: 99%

Leaching characteristics of fly ash from fluidized bed combustion thermal power plant: Case study: Çan (Çanakkale-Turkey)

Baba

Gürdal

Sengunalp

2010

Fuel Processing Technology

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It is known that the concentration of elements of fly ash varies due to the used-coal and the used-lime qualities varying in different periods. In the Çan Thermal Power Plant (CTPP) located at northwestern Turkey, Çan (Çanakkale) basin coals, which are classified as lignite to sub-bituminous C coal with high total sulphur (0.4-12.22%) and a broad range of ash contents (3.2-44.6%) are mainly used. Performed studies reveal that some toxic elements exit in the coal, including As, U and V. Also, while the As, Cu, Co and Hg contents in coal increases, the sulphur contents in coal also increase. Additionally, trace elements that have inorganic compounds in coal are mobilized into air during the combustion process. This poses a big risk for human health and keeping the environment when Çan Basins low quality lignite is burned, it's the fly ash that contains several toxic elements which can leach out and contaminate the water resources. In this study, toxicity tests were conducted on the fly ash samples that were obtained from the fluidized bed combustion of Çan Thermal Power Plant. The results showed that water temperature, pH and the quality of the limestone used were the most important factors affecting the leaching properties. Concentration of some toxic elements found in the fly ash, such as; As, Cd, Cr, Pb, Se and Zn were analyzed. Concentration richness of some heavy metals were attributed to the increase of water temperature, especially when pH is lower than 5. At pH = 5 value, there is no clear explanation of each heavy metal presence in the fly ash from fluidized bed combustion thermal power plant.

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“…As the temperature decreases downstream, they may nucleate and grow to form a submicrometer-sized aerosol that is difficult to capture in conventional air-pollution control devices. [1][2][3][4][5][6] Fine particles may pose enhanced health risks; 7 thus, EPA is considering modifying the National Ambient Air Quality Standards for particulate matter. 8 The metallic species have been reported to be enriched in combustion exhausts (compared to their concentrations in the feed).…”

Section: Introductionmentioning

confidence: 99%

Control of Toxic Metal Emissions from Combustors Using Sorbents: A Review

Biswas

1998

Journal of the Air & Waste Management Association

172

123

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This paper constitutes a review of the control of toxic metal emissions using sorbents. The objective of sorbent-injection methods is to effectively capture the metal species (preferably transform it to an environmentally benign form) and to suppress the fraction in the submicrometer mode. The design of an effective sorbent-injection methodology thus requires an understanding of the fate of the metallic species and its transformation pathways (transfer to the gas phase, subsequent chemistry at high temperatures, and aerosol formation and growth dynamics) in the combustor. Several different sorbent methodologies used for metals capture are discussed, and a mechanistic description is provided. The need for further experimentation and pilot scale testing is also emphasized.

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Trace elements in fly ash. Dependence of concentration on particle size

Abstract: or adsorption onto the smallest particles is proposed to account for the trace element concentration dependence on particle size. The environmental significance of the results is discussed.

Cited by 657 publications

References 12 publications

Effect of Coal Type and Residence Time on the Submicron Aerosol Distribution from Pulverized Coal Combustion

Effect of Coal Type and Residence Time on the Submicron Aerosol Distribution from Pulverized Coal Combustion

Leaching characteristics of fly ash from fluidized bed combustion thermal power plant: Case study: Çan (Çanakkale-Turkey)

Control of Toxic Metal Emissions from Combustors Using Sorbents: A Review

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