Combustion behavior of granulated and pulverized coal in a PCI rig: combustibility and pressure variation analysis

Fragoso, Hector Picarte; Pohlmann, Juliana Gonçalves; Machado, Janaína Gonçalves Maria da Silva; Vilela, Antônio Cezar Faria; Osório, Eduardo

doi:10.1016/j.jmrt.2019.09.055

Cited by 5 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Outra razão pode ser o tamanho das partículas dos combustíveis. Sabe-se que a redução da granulometria dos carvões minerais pode melhorar substancialmente seu desempenho de combustão, devido ao favorecimento de fenômenos cinéticos e diminuição do gradiente térmico da superfície em relação ao centro da partícula, aumentando a queima [28].…”

Section: Combustíveis Individuaisunclassified

Avaliação Da Combustão E Co-Combustão De Pneu Inservível E Carvão Mineral Em Termobalança Visando À Injeção Em Altos-Fornos

Lima,

Fragoso,

Pohlmann

et al. 2023

ABM Proceedings

View full text Add to dashboard Cite

Neste trabalho, o comportamento de combustão de pneu inservível e de carvão mineral, assim como o comportamento de co-combustão de suas misturas (5%, 10% e 30% de adição de pneu inservível), foram avaliados a partir de ensaios de combustibilidade em um analisador termogravimétrico, com objetivo de estudar a substituição parcial do carvão pulverizado na sua injeção em altos-fornos (PCI). Também foi feita a caracterização e determinação do poder calorífico superior (PCS) dos combustíveis e suas misturas. O comportamento não aditivo do PCS das misturas revelou que houve um efeito sinérgico positivo pela adição de pneus inservíveis. Em geral, o comportamento de cocombustão das misturas correspondeu à soma dos comportamentos individuais de seus constituintes. Os testes de co-combustão indicaram que a adição do pneu gerou uma redução da temperatura de ignição do carvão. No início da combustão, a adição de pneu inservível aumentou o grau de conversão nos momentos iniciais, e garantiu a manutenção do grau de conversão nos momentos finais da combustão, gerando o efeito de suporte de combustão. A adição de 10% de pneu inservível apresentou o comportamento otimizado, com o melhor equilíbrio entre a melhora do comportamento da combustão e o limite de teor de cinzas requerido.

show abstract

Section: Combustíveis Individuaisunclassified

Avaliação Da Combustão E Co-Combustão De Pneu Inservível E Carvão Mineral Em Termobalança Visando À Injeção Em Altos-Fornos

Lima,

Fragoso,

Pohlmann

et al. 2023

ABM Proceedings

View full text Add to dashboard Cite

show abstract

“…The conditions are more severe due to the high-velocity plume of coal, which leads to coke degradation through mechanical means and chemical attack from alkali metals within the coal. Despite this, coal has an impact on reduction conditions within the furnace [33]. Coal injection will increase hydrogen within the furnace in the temperature range of 800 o C to 1100 o C.…”

Section: Coal Injection In the Blast Furnacementioning

confidence: 99%

“…Coals selected for injection are normally anthracitic high-rank coal or bituminous medium-ranked coals as per Figure 7[45]. The high fixed carbon within these types of coal provides the carbon for reaction with oxygen to form CO2 and CO for the reduction of iron ore to iron [33]. Injection coal properties are usually controlled through the blending of various coal types to achieve the desired criteria such as cost, slag formation, volatile matter and ash constituents which has been discussed further using the work of Shan Wen Du et al in section 2.8.3 of the literature review.…”

Section: Coal Properties For Injectionmentioning

confidence: 99%

Optimising Carbon Type Differentiation Techniques to Reduce Dust Emissions in Blast Furnace Ironmaking

Lewis¹

View full text Add to dashboard Cite

The manufacturing process of iron, using the blast furnace (BF) generates dust as a byproduct, which is recycled, however, the generation of the dust in excess is undesirable.A comprehensive review of the dust has determined that each of the raw materials for blast furnace ironmaking contributes to its formation, including several forms of carbon thus addressing the hypothesis 'The raw materials that feed the blast furnace are expelled into the gas stream and all influence the blast furnace dust.' The current technique for quantifying coal originating carbon type mostly in the form of coal char, referred to as the nominal term Low Order Carbon (LOC) within BF dust consists of thermogravimetric analysis (TGA) however, this technique does not allow for samples of dust to be analysed in a timely manner, in line with the ever-changing conditions of the blast furnace. In this work, the TGA method has been trialled for use with BF dust, with improvements offered to the heating profile, allowing for faster analysis.Moreover, alternative techniques have been trialled, in combination with various characterisation methods such as X-ray diffraction, Scanning Electron Microscopy, total carbon and Optical Emission Spectroscopy. The 'Winkler Method' which was originally designed to quantify charcoal in soil sediment has been successfully adapted and optimised to suit LOC quantification in BF dust, showing a good correlation with the original benchmark technique. This answered the hypothesis, 'Thermal techniques can be used to differentiate carbon sources in dust generated in blast furnaces that use granulated coal injection.' The techniques for LOC quantification were applied to dust samples spanning a 9 month period. to determine the process parameters that influence the LOC presence within the dust. It was found that the resolution of sampling is key to identify relationships between process parameters and LOC within the dust. A novel technique to continuously monitor the dust output of the furnace found that the dust output and the LOC within the dust are related, where the increasing dust output leads to increasing concentrations of LOC within the carbon profile of the dust itself. Process parameters including blast pressure, blast volume, and production rate were considered to increase the dust output from the furnace based on the work of the dust probe, thus answering the hypothesis 'Coal combustion in the raceway can be impacted by process parameters and the evidence can be found in the fingerprint of blast furnace dust.' A node mapping exercise was used to model an ideal set of process conditions for low dust operations. The foundations to make macro advances in carbon and dust output reduction in blast furnace ironmaking are laid out in this thesis. iii Acknowledgements The academic guidance provided by Dr Hollie Cockings has been totally faultless, her enthusiasm for the subject has kept me motivated throughout this thesis and her direction has been second to none. My gratitude to the staff of the Materials and Manuf...

show abstract

Evaluation of Singrauli Coals for Sustainable Energy Utilisation: Insight From Geochemical and Petrographic Perspectives

Gopinathan,

Mahato,

Kumar

et al. 2024

Geological Journal

View full text Add to dashboard Cite

The study investigated 50 Permian coals from the Singrauli Coalfields in the Son Valley Basin, India, using advanced petro‐geochemical techniques to assess their source rock properties, energy and utilisation potential and to reconstruct the paleodepositional environment. Petrological analysis indicated vitrinite reflectance values between 0.39% and 0.49%, classifying the Singrauli coals as sub‐bituminous to high volatile bituminous rank and indicating a thermally immature state. The results of geochemical analysis (volatile matter: 36.8%–46.5% and Tmax: 420°C–425°C) further support the above contention. High carbon content (average 77.89%), low sulphur content (average 0.46%) and varying nitrogen and oxygen levels in studied coal enhance its environmental suitability. The hydrogen index (HI: 163–279 mg HC/g TOC) values suggest a predominance of type‐III kerogen with mixed type‐II–III kerogen, further supported by petrographic data. Moreover, geochemical and petrographic data suggested the suitability of Singrauli coals for gasification. The high total organic carbon (TOC ≥ 38 wt%) indicated admirable potential as a source rock for hydrocarbon generation, particularly within the gas‐source rock zone, highlighting their suitability for energy production. Petrographic indices indicated a wet forest swamp origin with a telmatic source and bog region under ombrotrophic to mesotrophic hydrological circumstances. The association of macerals and total sulphur content further supported the conclusion of a freshwater environment during peat deposition.

show abstract

Combustion behavior of granulated and pulverized coal in a PCI rig: combustibility and pressure variation analysis

Cited by 5 publications

References 18 publications

Avaliação Da Combustão E Co-Combustão De Pneu Inservível E Carvão Mineral Em Termobalança Visando À Injeção Em Altos-Fornos

Avaliação Da Combustão E Co-Combustão De Pneu Inservível E Carvão Mineral Em Termobalança Visando À Injeção Em Altos-Fornos

Optimising Carbon Type Differentiation Techniques to Reduce Dust Emissions in Blast Furnace Ironmaking

Evaluation of Singrauli Coals for Sustainable Energy Utilisation: Insight From Geochemical and Petrographic Perspectives

Contact Info

Product

Resources

About