Impact of Free Calcium Oxide Content of Fly Ash on Dust and Sulfur Dioxide Emissions in a Lignite-Fired Power Plant

Sotiropoulos, D. A.; Georgakopoulos, Andreas; Kolovos, Nestoras

doi:10.1080/10473289.2005.10464694

Cited by 13 publications

(14 citation statements)

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“…Using such fuels may produce huge amounts of flue gases and other types of wastes (i.e., bottom ash, fly ash, water polluted with radionuclides and PTEs, etc.) that are disposed off in the environment (Fernandez-Turiel et al 2004;Karamanis et al 2009;Kolovos et al 2002a;Papastergios et al 2005Papastergios et al , 2007Sotiropoulos et al 2005;Triantafyllou 2003; Vatalis and Kaliampakos 2006). Additionally, slagging and fouling severely affect the power plants' use of these lignites (Fernandez-Turiel et al 2004).…”

Section: Introductionmentioning

confidence: 93%

“…The lignite used in these power plants is characterized by high moisture levels, high calcium and ash content, and low calorific value and are thus considered as one of the poorest fossil fuels worldwide. The quality of the mined lignite is strongly connected to the quality of the organic matter (rank), the inorganic impurities, and the nature of the sterile layers that are excavated with the lignite (Christanis et al 1998;Fernandez-Turiel et al 2004;Filippidis et al 1996;Georgakopoulos et al 1995;Kolovos et al 2002a, b, c;Sotiropoulos et al 2005). Using such fuels may produce huge amounts of flue gases and other types of wastes (i.e., bottom ash, fly ash, water polluted with radionuclides and PTEs, etc.)…”

Section: Introductionmentioning

confidence: 96%

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Factors affecting the distribution of potentially toxic elements in surface soils around an industrialized area of northwestern Greece

et al. 2011

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In order to investigate the factors influencing the distribution of 32 potentially toxic elements in the Ptolemais-Kozani basin, northwestern Greece, 38 soil samples were collected and analyzed. Concentrations of Al, and Zn were determined by ICP-AES and concentrations of As, Bi, Cd, Cs, Mo, Rb, Sb, Th, Tl, and U by ICP-MS. Bivariate analysis, principal component analysis, and geostatistical analysis were employed to investigate the factors influencing the distribution of the elements determined in the study area. The results indicate that the distribution of the majority of elements determined, especially for Cr, Ni, and associated elements, is greatly influenced by the geology and geomorphology of the study area. Principal component analysis has yielded four factors that explain over 77% of the total variance in the data. These factors are as follows: lithophilic elements that are associated with Al silicates minerals of K (factor I: 29.4%), ultramafic rocks (factor II: 20.5%), elements that are coprecipitated with Fe and Mn oxides (factor III: 18.0%), and anthropogenic activities (factor IV: 9.3%). The anthropogenic activities that influence the distribution of several potentially toxic elements (i.e., Cd, Cu, Pb, Zn) are agricultural practices and the deposition of fly ash in the vicinity of the local power stations.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 96%

Factors affecting the distribution of potentially toxic elements in surface soils around an industrialized area of northwestern Greece

et al. 2011

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“…Calcium shows high values for all samples, since the feed lignite of Agios Dimitrios is characterized by high Ca contents [1,2,6]. The mineralogical analysis of the investigated samples showed that calcium minerals are dominant (anhydrite, calcite, portlandite, lime, high-calcium glass) [6].…”

Section: Resultsmentioning

confidence: 97%

“…These plants consume approximately 73 million tons of lignite per year and produce nearly 13 million tons of fly ash per year. Agios Dimitrios is a typical steam generating Power Plant, the biggest lignite fired Power Plant of Greece, having a total installed capacity of 1595 MW in five thermal units [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Slag and ash chemistry after high-calcium lignite combustion in a pulverized coal-fired power plant

Papastergios

Fernández-Turiel²,

Georgakopoulos³

et al. 2013

Global NEST Journal

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More than 73% of the electrical power requirements of Greece are generated in lignite-fired power plants. Greece is the thirteenth largest coal and the fifth largest lignite producer in the world. The lack of domestic high-rank coals makes necessary to use low quality lignite for power generation in Greece. These lignites are characterized by a high water and ash content and a low calorific value. The low quality of such lignites generates important technical and environmental problems during combustion. Slagging and fouling are common inside the power units and affect with particular severity the power plants performance. Slagging deposits take place in the high temperature radiant sections of the boiler, and are usually associated with some degree of melting of the ash. Fouling deposits are produced in the lower temperature convective sections of the boiler, and are generally related to condensation on the low temperature tube surfaces. Problems in boilers associated with ash deposits include modification of the heat transfer in different sections of the furnace, physical distortion of metal pieces due to the weight of the deposit, clogging of burners, and corrosion and erosion of metal walls. Feed lignite always carries more than 20% of inorganic matter, and its mineralogy and chemistry are originally related to geological factors. Five representative samples were collected from the inner surfaces of Unit 1 of the Agios Dimitrios Power Plant, Northern Greece, reflecting the main types of ash deposits occurring in the combustion facility. The chemistry of these high-calcium ash deposits has been investigated. Moreover, a fly ash and a bottom ash samples were taken and analyzed in order to investigate their possible impact on the environment after land-filling. All samples were digested by using 2.5 ml HNO 3 , 5ml HF and 2.5 ml HClO 4 (1:2:1). Sixty element concentrations were determined in all samples by inductively coupled plasma-mass spectrometry (ICP-MS) and inductively coupled plasma -optical emission spectrometry (ICP-OES). Calcium is the most abundant element in all samples due to the dominance of calcium phases. The chemical composition of the bottom ash, fly ash, slag and fouling deposits, is mainly influenced by the chemical composition of the feed lignite and the co-excavated sterile materials, which are marly limestones containing, on average, 93% of calcite.

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“…For this reason no measurements and information exist before this date. After 1980 the CO 2 content is taken into account in the calculations referred to in the evaluation of each deposit, based on the ash 2003, Sotiropoulos et al, 2005. The ash yield of each sample is due to the presence of various fossils shells, apart from the inorganic materials comprised into lignite and the thin barren layers (clay, marls, etc.)…”

Section: Co 2 Content In the Ashmentioning

confidence: 99%

Co2 Content of Greek Lignite: The Case of Proastio Lignite Deposit in Ptolemais Basin, Northern Greece

Μεταξάς¹,

Georgakopoulos²,

Καραγεωργίου³

et al. 2017

geosociety

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Impact of Free Calcium Oxide Content of Fly Ash on Dust and Sulfur Dioxide Emissions in a Lignite-Fired Power Plant

Cited by 13 publications

References 12 publications

Factors affecting the distribution of potentially toxic elements in surface soils around an industrialized area of northwestern Greece

Factors affecting the distribution of potentially toxic elements in surface soils around an industrialized area of northwestern Greece

Slag and ash chemistry after high-calcium lignite combustion in a pulverized coal-fired power plant

Co2 Content of Greek Lignite: The Case of Proastio Lignite Deposit in Ptolemais Basin, Northern Greece

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