Importance of the textural characteristics of inert additives in the reduction of coal thermoplastic properties

Fernández, A. M.; Barriocanal, C.; Díez, M.A.; Álvarez, R.

doi:10.1016/j.fuel.2010.03.006

Cited by 24 publications

(22 citation statements)

References 27 publications

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“…Although the differences are small they are significant enough to suggest that heat treatment induces an increase in porosity. The results of this study corroborate those of a previous paper [32] that chars with a higher porosity induce greater reductions in coal fluidity.…”

Section: Influence Of Biomass On Coal Thermoplastic Propertiessupporting

confidence: 91%

“…The effect of carbonaceous additives on coal plastic properties can be considered a combination of two factors: on the one hand, the chemical interaction between the coal devolatilization products and the volatiles evolved by the additives during heating and on the other, the physical adsorption by the additive of the products responsible for the thermoplasticity of a coal. The inert additive that is blended with the softening coal may have the effect of reducing fluidity by adsorbing the primary decomposition products that act as coal plasticiziers [29,31,32].…”

Section: Influence Of Biomass On Coal Thermoplastic Propertiesmentioning

confidence: 99%

“…In a previous research work [32] the importance of the textural characteristics of various additives that had been thermally treated to 900 °C to avoid interaction between the volatile matter evolved by the additive during co-carbonization was studied and compared with the effect of the whole additive. In the present study it appears that it is the physical effect of the additive (i.e.…”

Section: Influence Of Biomass On Coal Thermoplastic Propertiesmentioning

confidence: 99%

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Effect of the addition of waste sawdust on thermoplastic properties of a coal

Montiano

Barriocanal

Álvarez

2013

Fuel

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Three different sawdusts obtained as wastes from the furniture and flooring industry were selected to study their influence on coal thermoplastic properties. A bituminous coal with a high volatile matter content was chosen as base coal. To investigate the effect of reducing the oxygen content of the sawdusts upon the coal's properties, the sawdusts were heat treated to 250 °C. Blends of the coal with the three as-received and then heat-treated sawdusts were tested. In order to gain a better insight into the subject, the sawdusts were pyrolyzed at 400 °C to determine the effect of the resulting char and bio-oil upon the plastic properties of the base coal. The Gieseler curves corresponding to the coal-sawdust blends were calculated from the curves corresponding to the coal-char and coal-bio-oil blends. The errors obtained were in all six cases lower than the repeatability allowed by the ASTM standard for the Gieseler test. Considering that the effect of the additives is the sum of both chemical and physical effects, it was possible to evaluate the contribution of each of these to the reduction of coal fluidity. In all cases it was found that the physical effects were more important. The textural properties of the chars obtained at 400 °C from the biomass were found to be important for determining the influence of biomass on the coal fluidity.

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Section: Influence Of Biomass On Coal Thermoplastic Propertiessupporting

confidence: 91%

Section: Influence Of Biomass On Coal Thermoplastic Propertiesmentioning

confidence: 99%

Section: Influence Of Biomass On Coal Thermoplastic Propertiesmentioning

confidence: 99%

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Effect of the addition of waste sawdust on thermoplastic properties of a coal

Montiano

Barriocanal

Álvarez

2013

Fuel

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“…Menéndez, et al, mostrou que o caráter totalmente inerte do coque verde de petróleo é discutível, uma vez que ele pode contribuir para aumentar a fração "líquida" do sistema devido a sua interação química com os carvões. A capacidade de adsorção de gases e líquidos de cada material também influem nas propriedades termoplásticas do sistema [6]. No entanto, não foi objetivo do nosso estudo propor um mecanismo completo para explicar a redução das propriedades termoplásticas das misturas devido à adição de coque verde de petróleo.…”

Section: Implicações Da Adição De Coque Verde De Petróleo No Fenômenounclassified

“…A adição do CVP atua como um depressor das propriedades termoplásticas da mistura de carvões para coqueificação. Esses efeitos podem ser vistos na redução dos parâmetros de testes termoplásticos, como na diminuição da máxima fluidez e intervalo plástico na plastometria Gieseler [4][5][6][7]. A redução das propriedades termoplásticas deve-se a interação química entre os produtos de desvolatilização do carvão e do material inerte (CVP), e também a adsorção física dos produtos da pirólise responsáveis pela termoplásticidade dos carvões [6].…”

Section: Introductionunclassified

Avaliação Do Efeito Da Adição De Coque De Petróleo Em Termoplasticidade De Misturas De Carvões Contendo Carvão Nacional

Agra¹,

Flores²,

Rückert³

et al. 2017

Anais Dos Seminários De Redução, Minério De Ferro E Aglomeração

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Resumo Esse trabalho teve como objetivo avaliar o efeito da adição de diferentes teores de coque verde de petróleo (5, 15 e 30%) nas propriedades termoplásticas de misturas de carvões contendo carvão nacional da camada barro branco. A caracterização termoplástica das misturas foi realizada a partir de testes de plastometria Gieseler e dilatometria Audibert-Arnu. A caracterização dos carvões mostrou que o carvão nacional possui propriedades termoplásticas muito superiores aos demais carvões. Por consequência, verifica-se que a sua introdução nas misturas causa aumento das propriedades termoplásticas nos testes de plastometria e dilatometria. O coque verde de petróleo, em contrapartida, é um aditivo inerte e atua como um depressor das propriedades termoplásticas. Constatou-se que a adição do coque verde de petróleo às misturas causa redução da fluidez, do intervalo plástico e dilatação nos testes realizados. A sinergia entre do carvão nacional de alta fluidez e o caráter inerte do coque de petróleo mostrou-se vantajoso.

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