Partitioning of selected trace elements in coal combustion products from two coal-burning power plants in the United States

Swanson, Sharon M.; Engle, Mark A.; Ruppert, Leslie F.; Affolter, Ronald H.; Jones, Kathleen W.

doi:10.1016/j.coal.2012.08.010

Cited by 65 publications

(36 citation statements)

References 52 publications

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“…According to Srivasta et al (2001), the combination of powdered activated carbon (PAC) injection and FF removes Hg better than the corresponding PAC injection and ESP combination because FF provides added residence time and a contact bed for increased absorption of mercury. Similar findings were reported by Wang et al (2008), Tian (2011), and Swanson et al (2013). Other control technologies include the combination of selective catalytic reactor (SCR), cold side (CS)-ESP, and wet FGD which shows better performance than the combination of ESP and FGD (Pudasainee et al, 2009).…”

Section: Introductionsupporting

confidence: 81%

“…Fly ash. In general, fly ash is reported to contain higher concentrations of most TEs compared to bottom ash, which is especially true for very volatile TEs in Class III and to some extent for TEs in Class II (note that some works reported higher TEs in bottom ash compared to fly ash) (Bhangare et al, 2011;Córdoba, Ochoa-Gonzalez, et al, 2012;Sushil and Batra, 2006;Depoi et al, 2008;Reddy et al, 2005;Swanson et al, 2013). This is due to the volatilization of TEs during combustion and condensation on the surface of fly ash particles.…”

Section: Resultsmentioning

confidence: 98%

“…But many studies have been conducted in countries that rely on coal to generate electricity, such as in China (Chen et al, 2013;Lee et al, 2006;Li et al, 2012;Tang et al, 2012;Wang et al, 2011;Wang et al, 2010;Wang et al, 2008;Zhong et al, 2010), the United States (Nyberg et al, 2009;Swanson et al, 2013), and India (Reddy et al, 2005;Sushil and Batra, 2006;Vejahati et al, 2010). The studies are mainly driven by the increasing number of coal-fired power plants, which leads to higher coal consumption and introduction of stringent regulation such as the Mercury and Air Toxic Standard (MATS) in the United States.…”

Section: Coal-fired Power Plants In Malaysiamentioning

confidence: 99%

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Understanding selected trace elements behavior in a coal-fired power plant in Malaysia for assessment of abatement technologies

Mokhtar

Taib

Hassim

2014

Journal of the Air & Waste Management Association

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The Proposed New Environmental Quality (Clean Air) Regulation 201X (Draft), which replaces the Malaysia Environmental Quality (Clean Air) 1978, specifies limits to additional pollutants from power generation using fossil fuel. The new pollutants include Hg, HCl, and HF with limits of 0.03, 100, and 15 mg/N-m 3 at 6% O 2 , respectively. These pollutants are normally present in very small concentrations (known as trace elements [TEs]), and hence are often neglected in environmental air quality monitoring in Malaysia. Following the enactment of the new regulation, it is now imperative to understand the TEs behavior and to assess the capability of the existing abatement technologies to comply with the new emission limits. This paper presents the comparison of TEs behavior of the most volatile (Hg, Cl, F) and less volatile (As, Be, Cd, Cr, Ni, Se, Pb) elements in subbituminous and bituminous coal and coal combustion products (CCP) (i.e., fly ash and bottom ash) from separate firing of subbituminous and bituminous coal in a coal-fired power plant in Malaysia. The effect of air pollution control devices configuration in removal of TEs was also investigated to evaluate the effectiveness of abatement technologies used in the plant. This study showed that subbituminous and bituminous coals and their CCPs have different TEs behavior. It is speculated that ash content could be a factor for such diverse behavior. In addition, the type of coal and the concentrations of TEs in feed coal were to some extent influenced by the emission of TEs in flue gas. The electrostatic precipitator (ESP) and seawater flue gas desulfurization (FGD) used in the studied coal-fired power plant were found effective in removing TEs in particulate and vapor form, respectively, as well as complying with the new specified emission limits. Implications: Coals used by power plants in Peninsular Malaysia come from the same supplier (Tenaga Nasional Berhad Fuel Services), which is a subsidiary of the Malaysia electricity provider (Tenaga Nasional Berhad). Therefore, this study on trace elements behavior in a coal-fired power plant in Malaysia could represent emission from other plants in Peninsular Malaysia. By adhering to the current coal specifications and installation of electrostatic precipitator (ESP) and flue gas desulfurization, the plants could comply with the limits specified in the Malaysian Department of Environment (DOE) Scheduled Waste Guideline for bottom ash and fly ash and the Proposed New Environmental Quality (Clean Air) Regulation 201X (Draft).

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Section: Introductionsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 98%

Section: Coal-fired Power Plants In Malaysiamentioning

confidence: 99%

See 1 more Smart Citation

Understanding selected trace elements behavior in a coal-fired power plant in Malaysia for assessment of abatement technologies

Mokhtar

Taib

Hassim

2014

Journal of the Air & Waste Management Association

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“…It is reported that the emission of trace elements is influenced by the thermodynamic properties of elements, the forms of elements in the feed fuel as well as the combustion environment [22][23][24][25][26][27]. Besides the experimental investigation, thermodynamic equilibrium calculation is also widely used to study the trace element behavior during coal combustion [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Trace Elements in Coal Gangue: A Review

Guo¹

2018

Contributions to Mineralization

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Coal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. Now, coal gangue utilization is a matter of great concern and has attracted wide interest. However, some toxic trace elements in coal gangue should be paid more attention during the utilization of coal gangue. In this article, the modes of occurrence and the leaching characters of trace elements in coal gangue were introduced according to the result of the sequential extraction method and the leaching method. The release character of trace elements during combustion of coal gangue and the environmental implication of trace elements in coal gangue were also discussed. The sulfide-bound trace elements are dominant form in coal gangue. Leaching behavior of trace elements from coal gangue is affected by many factors. Different trace elements presented different transformation behaviors. Trace elements in coal gangue could release out and produce environmental implication in various degrees, depending on the type of trace elements.

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“…A study by Liu et al [12] showed that U, Mo, Re, Se, Cr, and V are mainly associated with organic components and are less associated with illite or mixed-layer illite/smectite. Extensive work on the partitioning behavior of TEs during coal combustion has been carried out [13,14], such as on the concentration and distribution of TEs in combustion products [15][16][17], the volatilization or enrichment behavior and chemical composition of TEs in ash [18,19], and the morphology and control technologies of TEs [20,21]. However, information about the behavior and the physical and chemical forms of TEs emitted during coal pyrolysis and gasification is scarce [22].…”

Section: Introductionmentioning

confidence: 99%

The Fate of Trace Elements in Yanshan Coal during Fast Pyrolysis

et al. 2016

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Abstract:In this study, a high-sulfur and high-ash yield coal sample obtained from the Yanshan coalfield in Yunnan, China was analyzed. A series of char samples was obtained by pyrolysis at various temperatures (300, 400, 500, 600, 700, 800, and 900˝C) and at a fast heating rate (1000˝C/min). A comprehensive investigation using inductively coupled plasma mass spectrometry (ICP-MS), a mercury analyzer, ion-selective electrode (ISE) measurements, X-ray diffraction (XRD) analysis, and Fourier transform infrared (FTIR) spectroscopy was performed to reveal the effects of the pyrolysis temperature on the transformation behavior of trace elements (TEs) and the change in the mineralogical characteristics and functional groups in the samples. The results show that the TE concentrations in the raw coal are higher than the average contents of Chinese coal. The concentrations of Be, Li, and U in the char samples are higher than those in raw coal, while the opposite was observed for As, Ga, Hg, and Rb. The F and Se concentrations are initially higher but decrease with pyrolysis temperature, which is likely caused by associated fracturing with fluoride and selenide minerals. Uranium shows the highest enrichment degree, and Hg shows the highest volatilization degree compared to the other studied TEs. As the temperature increases, the number of OH groups decreases, and the mineral composition changes; for example, pyrite decomposes, while oldhamite and hematite occur in the chars. It is suggested that the behavior and fate of TEs in coal during fast pyrolysis are synergistically influenced by self-characteristic modes of occurrence and mineralogical characteristics.

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Partitioning of selected trace elements in coal combustion products from two coal-burning power plants in the United States

Cited by 65 publications

References 52 publications

Understanding selected trace elements behavior in a coal-fired power plant in Malaysia for assessment of abatement technologies

Understanding selected trace elements behavior in a coal-fired power plant in Malaysia for assessment of abatement technologies

Trace Elements in Coal Gangue: A Review

The Fate of Trace Elements in Yanshan Coal during Fast Pyrolysis

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