Fly ash characteristics in co-combustion of wood with coal, oil or peat

Steenari, Britt‐Marie; Lindqvist, Oliver

doi:10.1016/s0016-2361(98)00177-x

Cited by 52 publications

(22 citation statements)

References 7 publications

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“…This is also in accordance with literature review (Steenari and Lindqvist 1999). The addition of coal in the fuel mixture enriches the ash composition in Fe.…”

Section: Chemical Compositionsupporting

confidence: 92%

“…On the other hand wood fly ash is rich in phosphorous, as seen in the aforementioned tables. This phosphorous originates from the raw material (wood) used (Steenari and Lindqvist 1999). Consequently, P 2 0 5 was significant enriched in the fly ash samples originating from this material.…”

Section: Chemical Compositionmentioning

confidence: 97%

“…It is generally noticed that when the proportion of wood in the coal -wood mixture is increased, the concentration of alkalis (Na and especially K) is also elevated. In the following table (Table 8) According to the literature (Steenari and Lindqvist 1999), the concentration of trace elements of the coal ash from fluidised bed ranges between 1-300 mg/kg, while the concentration of Cr ranges between 1-500 mg/kg. Co concentrations range in the same orders of magnitude.…”

Section: Chemical Compositionmentioning

confidence: 99%

See 2 more Smart Citations

Mineralogical and Chemical Composition of CFB Fly Ash Derived From Co-Combustion of Xylite and Biomass

Koukouzas

Hämäläinen²,

Papanikolaou

et al. 2007

geosociety

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“…This is also in accordance with literature review (Steenari and Lindqvist 1999). The addition of coal in the fuel mixture enriches the ash composition in Fe.…”

Section: Chemical Compositionsupporting

confidence: 92%

Section: Chemical Compositionmentioning

confidence: 97%

Section: Chemical Compositionmentioning

confidence: 99%

See 1 more Smart Citation

Mineralogical and Chemical Composition of CFB Fly Ash Derived From Co-Combustion of Xylite and Biomass

Koukouzas

Hämäläinen²,

Papanikolaou

et al. 2007

geosociety

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show abstract

“…Only small amounts of Mn, Al, Cu, Fe, P, and Zn were released from the pellets, in agreement with earlier studies [8]. At high pH levels, calcium binds with P in calcium phosphate compounds that have a low solubility, and becomes more mobile when the pH decreases below pH =8 [30].…”

Section: Leachingsupporting

confidence: 91%

Reactivity and Leaching of Wood Ash Pellets Dehydrated by Hot Air and Flue Gas

Sarenbo¹,

Mellbo²,

Stålnacke³

et al. 2009

TOWMJ

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Abstract:Companies that generate a large amount of wood ash will need an industrial process to agglomerate the ash and lower its reactivity, because untreated ash is a dust hazard for workers and is difficult to spread evenly on forest soil. In addition, untreated ash can cause burning damage to vegetation owing to its alkalinity and rapid release of salts. Production of large amounts of wood ash agglomerates demands an effective dehydration process. The reactivity and release of inorganic constituents from wood ash pellets dehydrated at room temperature using hot air and flue gas was investigated. Our results imply that flue gas-treated pellets have significantly lower reactivity in terms of pH and electrical conductivity, and release less Ca 2+ and more Mg 2+ compared to pellets dried at room temperature or in hot air. Ash pellets dehydrated in hot air are very reactive, and release more Ca 2+ than pellets dried in other ways. The formation of syngenite during the flue-gas treatment decreases K + release from the ash pellets.

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“…Several studies have been carried out on ashes from coals co-fired with petroleum coke, sewage sludge, and different types of biomass (e.g. Izquierdo et al, 2007Izquierdo et al, , 2008Hower et al 2005b;Jia et al 2002;Steenari and Lindqvist 1999;Diaz-Somoano et al, 2006;Wolski et al 2004;Lapa et al 2007), but little attention has been paid to the effects of co-firing with oil during start-up, even though this process may also have a significant impact on fly ash characteristics (Navarrette et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Mineralogy and Leaching Characteristics of Coal Ash from a Major Brazilian Power Plant

Silva¹,

Ward²,

Hower³

et al. 2010

CCGP

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A B S T R A C TThe feed coals, fly ashes and bottom ashes collected from seven different units in a major Brazilian PF power plant have been subjected to comprehensive mineralogical, geochemical, and petrographic studies, to investigate the links between feed coal and ash characteristics. Ashes from two of the units were collected while the coal was being co-fired with oil as part of the boiler start-up procedure, allowing the impact of oil co-firing on ash characteristics also to be evaluated. High proportions of unburnt carbon and high proportions of retained sulphur were found in the fly ashes produced during oil co-firing, probably reflecting less efficient combustion and associated lower combustion temperatures. Higher concentrations of a number of relatively volatile trace elements were also noted in these fly ashes, compared to the fly ashes collected from units under normal operating conditions.The fly ashes produced during oil co-firing gave rise to acid pH conditions in water-based leaching tests, in contrast to the alkaline pH associated with fly ashes produced during normal operations. This probably reflects higher SO 3 contents relative to total CaO + MgO for the co-fired ash samples. Many trace elements that are typically mobilised as cations were also more abundant in leachates from the co-fired fly ashes. This is due, most likely, to the more acid pH conditions involved. Despite similar or even higher total concentrations, however, elements that are typically released from coal ash as oxy-anions were less mobile from the co-fired fly ashes than from the normally-fired fly ash materials.

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Fly ash characteristics in co-combustion of wood with coal, oil or peat

Cited by 52 publications

References 7 publications

Mineralogical and Chemical Composition of CFB Fly Ash Derived From Co-Combustion of Xylite and Biomass

Mineralogical and Chemical Composition of CFB Fly Ash Derived From Co-Combustion of Xylite and Biomass

Reactivity and Leaching of Wood Ash Pellets Dehydrated by Hot Air and Flue Gas

Mineralogy and Leaching Characteristics of Coal Ash from a Major Brazilian Power Plant

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