Ash Properties of Alternative Biomass

Capablo, Joaquín; Jensen, Peter Arendt; Pedersen, Kim Hougaard; Hjuler, Klaus; Nikolaisen, Lars; Backman, Rainer; Frandsen, Flemming

doi:10.1021/ef8008426

Cited by 43 publications

(20 citation statements)

References 14 publications

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“…In the case of the straw/wood mixes, the ash content shows a similar (strong) correlation to DBU, but this trend was not observed for the straw/bark mixes. The latter trend, although based on two fuel mixes, is opposite to findings of Capablo et al [15] who showed that DBU was correlated to ash content and that all fuels with an ash content above 3.5 wt-% resulted in deposit rates above 100 g·m -2 h -1 . The DBU (550 o C) in this work are in the lower ranges compared to deposition data from other work on combustion of pulverised biomass in laboratory scale [15,6].…”

Section: Deposit Formationcontrasting

confidence: 96%

“…The latter trend, although based on two fuel mixes, is opposite to findings of Capablo et al [15] who showed that DBU was correlated to ash content and that all fuels with an ash content above 3.5 wt-% resulted in deposit rates above 100 g·m -2 h -1 . The DBU (550 o C) in this work are in the lower ranges compared to deposition data from other work on combustion of pulverised biomass in laboratory scale [15,6]. Skrifvars et al [10] reports that during (pf) combustion of wood, with ash content between 0.4-0.7 wt-%, in a 80 MW th boiler, the DBU were between 15-75 g·m -2 h -1 .…”

Section: Deposit Formationcontrasting

confidence: 96%

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Ash transformations in pulverised fuel co-combustion of straw and woody biomass

Nordgren

Hedman²,

Padban

et al. 2013

Fuel Processing Technology

100

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Ash transformation processes have been studied during co-firing of wheat straw and pine stem wood and softwood bark. Pilot-scale trials in a 150 kW pulverised-fuel-fired burner were performed. Thermodynamic equilibrium calculations were made to support the interpretation of the results. The results show that fast reactions involving gaseous ash compounds are favored at the expense of reactions where condensed components participate. Accordingly, the conditions promote gas phase reactions resulting in the formation of chlorides, sulfate and carbonates whereas reactions involving condensed reactants are suppressed. Both the slagging and fouling propensity of all co-firing mixes was reduced compared to that for pure straw. For the wood/straw mixes this was mainly due to a dilution of the ash forming elements of straw whereas for straw/bark, an additional effect from interaction between the fuel ash components was observed to primarily reduce slagging. In general it can be concluded that under powder combustion conditions equilibrium are approached selectively and that the ash matter are strongly fractionated. The general results in this paper are useful for straw-fired power stations looking for alternative co-firing fuels.

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Section: Deposit Formationcontrasting

confidence: 96%

Section: Deposit Formationcontrasting

confidence: 96%

Ash transformations in pulverised fuel co-combustion of straw and woody biomass

Nordgren

Hedman²,

Padban

et al. 2013

Fuel Processing Technology

100

View full text Add to dashboard Cite

show abstract

“…The spherical shape of the LFA particles is suggestive of the solidification of these particles from a viscous liquid. The absence of needle crystallites on glass spheres in LFA indicates the formation of mullite from kaolinite (Capablo et al, 2009). During FBC, mostly quartz crystals remain intact due to the low operating temperature.…”

Section: Morphological Studymentioning

confidence: 99%

“…The lignite-based pulverized fuel combustion (PFC) power plant at Neyveli; coal washery rejects-based FBC power plant of Tata Steel, Jamadoba; and mustard-stalk-based power plant, Kalpataru Power Transmission Limited (KPTL), Rajasthan have been in operation for a long time in India. The mineral matters present in these fuel feeds during their combustion are of technological and economic concern for utilities due to slagging and fouling, severe ash depositions, reduction in the heat transfer, and enhancement in the corrosion of boiler tubes (Capablo et al, 2009). Several studies on such aspects have been made (Ram, 1992;Vassileva and Vassilev, 2006;Khan et al, 2009;Koukouzasa et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

The Mineralogical Characteristics of the Ashes Derived from the Combustion of Lignite, Coal Washery Rejects, and Mustard Stalk

Singh¹,

Ram²,

Sarkar³

2013

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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With coal being the predominant and limited source of energy, extraction of energy from lignite, coalwashery rejects, and agro-wastes through combustion is being attempted globally. During combustion, minerals in the fuels undergo various transformations with corresponding impact on the process. Lignite fly ash, Jamadoba fly ash, and Kalptaru fly ash and corresponding fuels like lignite, coal-washery rejects, and mustard stalk from pulverized fuel, fluidized bed, and grate system of combustion at Neyveli, Jamadoba, Kalpataru, respectively, were characterized. Lignite has better fuel characteristics than washery rejects and mustard stalk. Of the major phases, SiO 2 , Al 2 O 3 , and CaO are common, besides Fe 2 O 3 in lignite fly ash and Jamadoba fly ash, and K 2 O in Kalptaru fly ash. Among minor phases, MgO, Na 2 O, SO 3 , P 2 O 5 , and TiO 2 are common, despite K 2 O in lignite fly ash and Jamadoba fly ash, and Fe 2 O 3 in Kalptaru fly ash. Other minerals are mullite, silicates, sulphates, and carbonates of Ca in lignite fly ash; K-Al-Si species in Jamadoba fly ash; K/Ca-Al-Si species, and sulphates and carbonates of Ca in Kalptaru fly ash. These minerals are the product of mineralogical transformations, where source and composition of the fuels and operating conditions are crucial. Overall the combustion of lignite is more successful than that of washery rejects and mustard.

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“…When various forms of biomass were burned in a pilot furnace, Capablo et al [6] found that the concentration of ash in the gas flow was proportional to the mineral matter content of the original fuel.…”

Section: Erosion Corrosion and Foulingmentioning

confidence: 99%

Generation of Energy from Sugarcane Bagasse by Thermal Treatment

Stanmore

2010

Waste Biomass Valor

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The worldwide harvest of sugarcane for sucrose production represents a major agricultural industry, with approximately Mt 1500 produced annually. The cane yields about 13.5% of its weight as sugar, together with an equal amount (dry weight) of fibrous bagasse as waste. The bagasse, which is predominantly cellulose, is burned at the mills to generate steam for sugar processing. The global drive towards renewable energy has seen bagasse recognised as a large resource of readily-available fuel which could be better utilised to generate electricity. This review examines current methods of burning the bagasse for steam generation, and also the possibilities for steam gasification to produce a biogas suitable for combustion in gas turbines.

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Ash Properties of Alternative Biomass

Cited by 43 publications

References 14 publications

Ash transformations in pulverised fuel co-combustion of straw and woody biomass

Ash transformations in pulverised fuel co-combustion of straw and woody biomass

The Mineralogical Characteristics of the Ashes Derived from the Combustion of Lignite, Coal Washery Rejects, and Mustard Stalk

Generation of Energy from Sugarcane Bagasse by Thermal Treatment

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