A thermogravimetric analysis of the combustion of a Brazilian mineral coal

Filho, Claudionor Gomes da Silva; Milioli, Fernando Eduardo

doi:10.1590/s0100-40422008000100021

Cited by 28 publications

(17 citation statements)

References 34 publications

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“…Both fossil and renewable fuels have very different decomposition profiles. The decomposition behavior of mineral coal is well known and has been the object of study in the literature [54,55].…”

Section: Pure Materialsmentioning

confidence: 99%

Comparative study on combustion and oxy-fuel combustion environments using mixtures of coal with sugarcane bagasse and biomass sorghum bagasse by the thermogravimetric analysis

Galina¹,

Luna

Arce³

et al. 2019

Journal of the Energy Institute

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Biomass and coal have different physicochemical properties and thermal behavior. During the co-combustion of coal-biomass mixtures, their thermal behavior varies according to the percentage of each fuel in the mixture. Thereby, this research aims to characterize the thermal behavior of mixtures of coal, sugarcane bagasse, and biomass sorghum bagasse as biomass in simulated combustion (O 2 /N 2) and oxy-fuel combustion (O 2 /CO 2) environments. Experiments have been performed in duplicate on a thermogravimetric analyzer at heating rate of 10 C/min. A uniform granulometry was considered for all materials (63 mm) in order to ensure a homogeneous mixture. Four biomass percentages in the mixture (10, 25, 50 and 75%) have been studied. Based on thermogravimetric (TG) and thermogravimetric (DTG) analyses, parameters such as combustion index, synergism, and activation energy have been determined, as well as the combustion environment influence on these parameters. The results indicate that, although sugarcane bagasse has the lowest activation energy, the thermal behavior of both types of biomass is similar. Thus, biomass sorghum bagasse can be used as an alternative biomass to supply the power required during sugarcane off-season. For both mixtures, optimal results were obtained at 25% of biomass. By analyzing the environment influence on combustion behavior, the results indicate that when N 2 is replaced with CO 2 , it is observed an increase in reaction reactivity, a higher oxidation rate of materials and an improvement in evaluated parameters.

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Section: Pure Materialsmentioning

confidence: 99%

Comparative study on combustion and oxy-fuel combustion environments using mixtures of coal with sugarcane bagasse and biomass sorghum bagasse by the thermogravimetric analysis

Galina¹,

Luna

Arce³

et al. 2019

Journal of the Energy Institute

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“…O ombro observado próximo a 557 °C é identificado como uma decomposição térmica da pirita. 30,31 Segundo Calkins e colaboradores, 25 este pico é ausente em carvões que não contêm pirita ou que apresentam esse mineral em concentrações baixas. Este resultado está de acordo com os dados obtidos na determinação das formas de enxofre, que indicaram teor de 0,81% de enxofre pirítico.…”

Section: Figura 1 Curvas De Análise Térmica (Tg Dtg) Da Amostra De unclassified

Caracterização detalhada de material de referência certificado de carvão brasileiro

Fallavena¹,

Abreu²,

Inácio³

et al. 2013

Quím. Nova

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Recebido em 31/1/12; aceito em 7/12/12; publicado na web em 12/3/13 DETAILED CHARACTERIZATION OF CERTIFIED REFERENCE MATERIAL OF BRAZILIAN COAL. The use and characterization of the first Certified Reference Material (CRM) of Brazilian coal for analytical quality control are presented. All results were determined within the limits of repeatability and reproducibility allowed under the standards. Notable among the characterization parameters was the mineral matter content (45.39%) obtained by an alternative procedure showing a low relative error (-2.1%) compared to the standard technique (low ashing temperature). The possible expanded application of this CRM application in national laboratories, beyond the certificated and reference parameters, has advantages such as lower cost and easy availability, but round robin tests must be performed.

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“…To estimate the oxidation characteristics of coal, methods of evaluating temperature or mass variation of coal by oxidation [11][12][13][14][15], and methods analyzing the amount of O 2 consumed or the amount of CO/CO 2 generated by the oxidation of coal [16][17][18][19][20] are usually applied. Among the above methods, because of the simplicity, measuring and comparing a crossing-point temperature (CPT) to indicate the onset temperature of self-heating by oxidation and heat accumulation has been widely used to characterize the susceptibility of coal to spontaneous combustion [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Comparison of spontaneous combustion susceptibility of coal dried by different processes from low-rank coal

Choi

Kim

et al. 2014

Korean J. Chem. Eng.

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We compared the susceptibility to spontaneous combustion of low-rank coals dried by four different processes: flash drying, fluidized bed drying, non-fried carbon briquetting, and coal-oil slurry dewatering. The coals were characterized by FT-IR and XPS analysis. A crossing-point temperature (CPT) was estimated as a comparison criterion of the susceptibility of the coals to spontaneous combustion. O 2 , CO, and CO 2 emissions during the CPT measurement were also compared. The FT-IR and XPS analysis revealed that some of the oxygen functional groups on the surface of the coal were removed when the coal underwent the drying process. This phenomenon was particularly noticeable in the coal dried by oil. Accordingly, the CPT of the coal that went through this drying process was high. Among the samples, the coals dried by oil showed the highest CPT.

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A thermogravimetric analysis of the combustion of a Brazilian mineral coal

Cited by 28 publications

References 34 publications

Comparative study on combustion and oxy-fuel combustion environments using mixtures of coal with sugarcane bagasse and biomass sorghum bagasse by the thermogravimetric analysis

Comparative study on combustion and oxy-fuel combustion environments using mixtures of coal with sugarcane bagasse and biomass sorghum bagasse by the thermogravimetric analysis

Caracterização detalhada de material de referência certificado de carvão brasileiro

Comparison of spontaneous combustion susceptibility of coal dried by different processes from low-rank coal

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