Catalytic effect of biomass ash on CO, CH 4 and HCN oxidation under fluidised bed combustor conditions

Löffler, G.; Wargadalam, Verina J.; Winter, Franz

doi:10.1016/s0016-2361(01)00203-4

Cited by 40 publications

(27 citation statements)

References 12 publications

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“…demonstrates another significant difference: ash enhances the volatile release of char significantly at the lower temperature range (300-350 °C) of BC combustion. It is also known that both the primary formation and secondary reactions of volatiles are sensitive to the presence of inorganic compounds [47,48] and heterogeneously catalysed oxidation of volatiles can explain this increase in weight loss in the presence of ash [49]. DeGroot et al…”

Section: Combustion Properties Of the Biomass Charmentioning

confidence: 99%

A comparative study on the pyrolysis of metal- and ash-enriched wood and the combustion properties of the gained char

Mayer

Apfelbacher

Hornung

2012

Journal of Analytical and Applied Pyrolysis

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This study aims to investigate the pyrolysis behaviour of metal-contaminated wood and the combustion properties of char derived from wood pyrolysis. Seven metals (Na, Mg, Ca, Zn, Cd, Pb and Fe(III)) were introduced to willow in cation form by ion-exchange and the thermal behaviour of demineralised samples and samples with additional ash were also investigated. The results show that the char yield increased from 21% to 24-28% and levoglucosan yield in vapour phase decreased from 88% to 62-29% after the addition of inorganic compounds, even though the metal binding capacity of wood varied from one metal ion to another. While char yield seems to be effected mainly by the concentration of the metal ions, levoglucosan yield was more dependent on the ionic species especially when sodium ions were present. When combustion experiments were carried out with char made of the metal enriched wood, two consecutive steps were observed, both effected by the presence of inorganic compounds. The first step was identified as the release and combustion of volatiles, while the second peak of the burning profile is the actual combustion of the fixed carbon. The burnout temperatures, estimated ignition indices and the conversion indicate that the type and not the amount of metal ions were the determining factors during the second step of combustion

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Section: Combustion Properties Of the Biomass Charmentioning

confidence: 99%

A comparative study on the pyrolysis of metal- and ash-enriched wood and the combustion properties of the gained char

Mayer

Apfelbacher

Hornung

2012

Journal of Analytical and Applied Pyrolysis

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“…Currently, various technologies are used for the thermo-chemical conversion of biomass. The most commonly used technologies include direct combustion, gasification, thermal pyrolysis, liquefaction, and hydrogen production (Brown et al 2000;Demirbas 2002;Loffler et al 2002;Sheth and Babu 2009;Iliuta et al 2010;Sun et al 2010).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Yao

Yan

et al. 2017

BioResources

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Three typical biomass fuels-rice husk, rice straw, and corn cobs-were combusted to understand the effects of ashing temperature on ash fouling and slagging characteristics. The ashes generated from combustion at 600 °C and 815 °C were characterized thoroughly with regard to their chemical composition. The systematic slagging/fouling indices of biomass were used to study the effects of ashing temperature on ash fouling and slagging propensities. The results showed that ashing temperature had a remarkable influence on ash composition, particle size distribution, ash morphology, ash fusibility, and thermal properties. Increased ashing temperature resulted in the expansion of ash particles together with the volatilization of alkali metals in the form of inorganic salts. Morphology analysis indicated that high ashing temperatures promoted biomass ash slagging. Ash fusion points increased at elevated ashing temperatures, while the ash content decreased. As a result of the volatilization and decomposition of biomass ash, a four-step mechanism of weight loss was clearly identified by thermal analysis. All prepared biomass ashes resulted in slagging and fouling problems at different levels during the thermochemical conversion of biomass.

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“…In addition, methylene reactions, where CH 2 radical reacts with H, O, OH, or CH 2 radicals can give CO as product. NO x are known to sensitise the oxidation of hydrocarbons to CO (Loeffler et al, 2002) among other products. Acetylene, ketyl, cyanoxy and isocyanic reactions also lead to CO products.…”

Section: Introductionmentioning

confidence: 99%

A theoretical prediction of non-methane gaseous emissions from natural gas combustion

Sonibare

Akeredolu

2004

Energy Policy

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Catalytic effect of biomass ash on CO, CH 4 and HCN oxidation under fluidised bed combustor conditions

Cited by 40 publications

References 12 publications

A comparative study on the pyrolysis of metal- and ash-enriched wood and the combustion properties of the gained char

A comparative study on the pyrolysis of metal- and ash-enriched wood and the combustion properties of the gained char

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

A theoretical prediction of non-methane gaseous emissions from natural gas combustion

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