Petrographic Characteristics of Coal Gasification and Combustion by-Products from High Volatile Bituminous Coal

Bielowicz, Barbara

doi:10.3390/en13174374

Cited by 9 publications

(3 citation statements)

References 47 publications

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“…The knowledge of the petrographic and mineral composition of the coal deposit, and the properties resulting from this composition, should be the basis for optimizing the conditions in coal preparation plants [6,19,20]. Such an approach makes it possible to control the properties of the final product in order to obtain concentrates with precisely Minerals 2021, 11, 1265 2 of 17 defined parameters and properties, usable in clean coal technologies (CCT), especially in combustion, coking, and gasification processes [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Application of Deep Learning in Petrographic Coal Images Segmentation

Iwaszenko¹,

Róg²

2021

Minerals

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The study of the petrographic structure of medium- and high-rank coals is important from both a cognitive and a utilitarian point of view. The petrographic constituents and their individual characteristics and features are responsible for the properties of coal and the way it behaves in various technological processes. This paper considers the application of convolutional neural networks for coal petrographic images segmentation. The U-Net-based model for segmentation was proposed. The network was trained to segment inertinite, liptinite, and vitrinite. The segmentations prepared manually by a domain expert were used as the ground truth. The results show that inertinite and vitrinite can be successfully segmented with minimal difference from the ground truth. The liptinite turned out to be much more difficult to segment. After usage of transfer learning, moderate results were obtained. Nevertheless, the application of the U-Net-based network for petrographic image segmentation was successful. The results are good enough to consider the method as a supporting tool for domain experts in everyday work.

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Section: Introductionmentioning

confidence: 99%

Application of Deep Learning in Petrographic Coal Images Segmentation

Iwaszenko¹,

Róg²

2021

Minerals

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“…O carvão mineral é definido como sendo uma rocha sedimentar composta por constituintes orgânicos (em menores frações) e inorgânicos, sendo caracterizado como uma mistura heterogênea complexa de fases sólidas, líquidas e gasosas [5,6]. No processo de queima do carvão mineral, em usinas termelétricas, para a produção de energia elétrica, são gerados subprodutos residuais como as escórias de caldeiras, monóxido e dióxido de carbono, e aumento da concentração de óxidos sulfurosos (SO X ), que tem impacto negativo sobre o meio ambiente e saúde humana [7,8] compostos orgânicos voláteis, cinzas de cinzas de combustão do carvão mineral (CCCM) como as cinzas de dessulfuração dos gases de combustão (FGD), e em maiores proporções, as cinzas leves (fly ash) e as cinzas de fundo (botton ash) [9], as quais são detalhadas conforme [10]: a) Escórias de caldeira (boiler slag) -são produzidas durante a combustão de carvão granulado em grelhas móveis, sendo geralmente retiradas pelo fundo da fornalha, após serem resfriadas com água.…”

Section: Introductionunclassified

Caracterização e avaliação da atividade pozolânica das cinzas provenientes da queima de carvão mineral das termelétricas do Pecém, Ceará, Brasil

et al. 2021

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RESUMO A tendência de estabilização do consumo de carvão mineral, observada até 2019, foi interrompida devido a pandemia de Sars-Cov 2 que afetou a produção energética baseada em carvão mineral, reduzindo a demanda mundial deste produto. A queima do carvão mineral para a produção energética em usinas termelétricas geram grandes quantidades de resíduos, como as cinzas leves (fly ash), proveniente de processos eletrostáticos e as cinzas de fundo (botton ash), provenientes de processos de dessulfuração do gás da chaminé (Flue Gas Desulfurization - FGD). Em muitos os resíduos são estocados em depósitos ao ar livre, tornando-se um potencial risco ao meio ambiente e aos ecossistemas circunvizinhos. Com vistas a melhorar compreensão das características destes resíduos, buscou-se caracterizar a cinza leve (CV1) e da cinza de fundo (CV2), resíduos provenientes das usinas termelétricas do Pecém I e II, localizadas no estado do Ceará/Brasil, quanto aos parâmetros químicos e físicos por meio de ensaios de composição química por FRX (Fluorescência de Raios X) e EDS (Espectroscopia de Energia Dispersiva), teor de umidade, perda ao fogo, teor de resíduos insolúveis, massa específica, finura pelo método de permeabilidade ao ar, caracterização granulométrica, avaliação microestrutura por MEV (Microscopia Eletrônica de Varredura), termogravimentria, determinação das fases mineralogia por DRX (Difração de Raios X) e avaliação da atividade pozolânica. Evidenciou-se que a CV1 apresenta características compatíveis com cinzas volantes tipo C e atividade pozolânica. Para a cinza CV2, observou-se que não foram atendidos aos requisitos químicos de atividade pozolânica, apresentando também altos teores de trióxido de enxofre e fases cristalinas como a Calcita, provenientes do processo de dessulfuração FGD. Em ambos os casos, as cinzas podem ser utilizadas em compostos cimentícios, desde que compatíveis com as características apresentadas, possibilitando assim a redução e acúmulo do material nas usinas, reduzindo os riscos ao meio ambiente.

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“…To ensure the sustainable and effective use of coal, an abundant fossil fuel, the environmental pollution issues associated with coal consumption are required to be adequately addressed [1][2][3][4], especially in China. Coal gasification technology which converts coal into electricity, hydrogen, chemical products, and other valuable energy is versatile and clean [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Coal Gasification in a Full-Scale Two-Stage Entrained-Flow Gasifier

Wang

et al. 2020

Energies

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In this paper, coal gasification characteristics in the reductor were investigated in a full-scale two-stage pressurized entrained-flow gasifier, which has been seldom conducted previously. The present study aimed at elucidating the effects of gasifying agent concentration, coal input rate, and operation period under full reductor load on the performance of a utility two-stage pressurized entrained-flow gasifier for the first time. When the steam input in the combustor was raised from 3318 kg/h to 5722 kg/h, the total outputs of H2, CO, and CO2 were increased by 1765 Nm3/h and 2063 Nm3/h, respectively, while the CH4 output was decreased by 49 Nm3/h. The coal conversion rate was minimal at low steam input. In addition, more coal gasified in the reductor could increase the output of CH4, while CH4 could reach 1.24% with the coal input in the range of 8000–10,000 kg/h. The present work can offer a further understanding of the gasification performance in the reductor of the full-scale two-stage pressurized entrained-flow gasifier, and motivates the potential for clean utilization of coal resource.

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Petrographic Characteristics of Coal Gasification and Combustion by-Products from High Volatile Bituminous Coal

Cited by 9 publications

References 47 publications

Application of Deep Learning in Petrographic Coal Images Segmentation

Application of Deep Learning in Petrographic Coal Images Segmentation

Caracterização e avaliação da atividade pozolânica das cinzas provenientes da queima de carvão mineral das termelétricas do Pecém, Ceará, Brasil

Experimental Study on Coal Gasification in a Full-Scale Two-Stage Entrained-Flow Gasifier

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