Combustion of eucalyptus charcoals and coals of similar volatile yields aiming at blast furnace injection in a CO2 mitigation environment

Pohlmann, Juliana Gonçalves; Borrego, Ángeles G.; Osório, Eduardo; Díez, M.A.; Vilela, Antônio Cezar Faria

doi:10.1016/j.jclepro.2016.04.138

Cited by 44 publications

(18 citation statements)

References 35 publications

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“…Gross calorific values for briquettes produced ranged between 27.15 and 30.67 MJ/kg, which compares well with the values obtained for wood char by other researchers [28][29][30][31].…”

Section: Gross Calorific Value Of Briquettessupporting

confidence: 89%

“…Ash content of the produced briquettes ranged between a minimum of 1.3% and a maximum of 4.6%. A survey of the literature for eucalyptus wood char (primary raw material for briquettes in this study) ash content reports a minimum of 1.9% and a maximum of 2.44% [29,30,33]. This indicates that the processing parameters had both negative and positive impact on the ash content of briquettes.…”

Section: Ash Content Of Briquettesmentioning

confidence: 50%

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Influence of processing conditions on the quality of briquettes produced by recycling charcoal dust

Tanui

Kioni

Kariuki

et al. 2018

Int J Energy Environ Eng

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Physical and thermal properties of briquettes produced by recycling charcoal dust under different processing conditions have been reported in this study. The main aim was to investigate the effects of the binder and processing conditions on the properties of briquettes. The effect of adding molasses binder on combustion properties of the briquette was first assessed. Then by fitting experimental data, mathematical models to predict gross calorific value, ash content, moisture content, relaxed density and shatter index with respect to binder mass fraction, drying temperature and compaction pressure were developed. All briquettes properties were predominantly affected by amount of molasses used. Molasses mass fraction increment in briquette results in significant increment in ash content, moisture content, relaxed density and shatter index and significant reduction in gross calorific value. Drying temperature did not have major influence on briquette properties except moisture content. Compaction pressure (50-150 MPa) used in this study had negligible influences on all briquette properties. Therefore, such high pressure which involves energy consumption is not necessary during production of charcoal dust briquettes. Optimized values of gross calorific value and shatter index were 29.031 MJ/kg and 80.363%, respectively, for 50 MPa compaction pressure, 29.512 °C drying temperature and 10% molasses mass ratio.

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“…Gross calorific values for briquettes produced ranged between 27.15 and 30.67 MJ/kg, which compares well with the values obtained for wood char by other researchers [28][29][30][31].…”

Section: Gross Calorific Value Of Briquettessupporting

confidence: 89%

Section: Ash Content Of Briquettesmentioning

confidence: 50%

Influence of processing conditions on the quality of briquettes produced by recycling charcoal dust

Tanui

Kioni

Kariuki

et al. 2018

Int J Energy Environ Eng

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“…[8]. Most studies focusing on biomass applications in ironmaking refer to the volatiles as an adjacent energy source or their effects on reactivity [9]. The role of biomass as a reducing agent to iron oxides has been typically approached through iron ore-carbon composites [3,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Iron Ore Reduction by Biomass Volatiles

Bagatini

Kan

Evans

et al. 2021

J. Sustain. Metall.

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The use of biomass in different routes of ironmaking has been recently investigated. Although the volatile matter is the major constituent of the biomass, its contribution as reducing agent has not been explored in detail. This work aimed to investigate the reduction of iron ore by biomass volatiles and elucidate the steps involved, searching for optimization of its use in the ironmaking industry. Experiments with biomass and iron ore packed beds placed separately were carried out in the interval between 200 and 1000 °C in an infrared furnace. Iron ore reduction was observed at low temperatures (< 800 °C) and increased up to 1000 °C, where wustite, metallic iron and cementite were detected by XRD. Carbon deposition at low temperatures and carbothermic reduction at high temperatures were identified through carbon analysis and thermal profile measures. At low temperature the reduction occurred mainly by the non-condensable gases (CO, H 2 ) from biomass pyrolysis and tar cracking reactions, while from 800 °C the reduction advanced by carbon deposited on the iron ore. The activation energy for the carbothermic reduction indicated the carbon gasification as the reaction-limiting step. The deposited carbon proved to be more reactive than other carbon sources commonly used in the ironmaking.

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“…O carvão metalúrgico, transformado em coque, é o principal redutor em uso no mundo, mas o Brasil não dispõe de reservas por isso utilizam o carvão vegetal como combustível, pois no Brasil, além do clima ser favorável ao plantio de florestas de eucalipto para a produção de carvão vegetal, existem áreas disponíveis para a plantação 3 . A fim de se diminuir os impactos ambientais associados às emissões atmoféricas, pesquisas ao redor do mundo estão investindo fortemente na incerção de biomassa como fonte energética [4][5][6] .…”

Section: Introductionunclassified

Incorporação De Escória De Alto Forno a Carvão Vegetal Em Massa De Cerâmica Vermelha

Zaccaron¹,

Fernandes²,

Nandi³

et al. 2020

Cerâm. ind.

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O presente estudo propõe a adição do resíduo gerado no processo metalúrgico, mais precisamente a escória de alto forno a carvão vegetal usado como agente redutor na cadeia produtiva. Além da massa padrão, foram feitas 3 formulações com a incorporação desse resíduo, em 5, 10 e 20%. As peças foram queimadas em três temperaturas, 850, 900 e 950 ºC e as propriedades tecnológicas estudadas foram: retração térmica linear de secagem e queima, absorção de água, perda ao fogo e resistência mecânica à compressão na peça seca e na peça queimada. Os resultados obtidos, mostram que até 20% de adição do resíduo na massa padrão, consegue-se atingir os limites estabelecidos por norma na fabricação de blocos de vedação, em escala laboratorial, dentro das três temperaturas estudadas. Palavas-chave: Valorização de resíduos, cerâmica vermelha, escória de carvão.

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Combustion of eucalyptus charcoals and coals of similar volatile yields aiming at blast furnace injection in a CO2 mitigation environment

Cited by 44 publications

References 35 publications

Influence of processing conditions on the quality of briquettes produced by recycling charcoal dust

Influence of processing conditions on the quality of briquettes produced by recycling charcoal dust

Iron Ore Reduction by Biomass Volatiles

Incorporação De Escória De Alto Forno a Carvão Vegetal Em Massa De Cerâmica Vermelha

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