Assessment of the pyrolysis, combustion and fractal dimension of fragmented oil shale particles

Haki, A.; Hadi, Manzoor; Bouhafid, A.

doi:10.1016/j.powtec.2017.06.004

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…The fractal concept was put forward to characterize the intricate geometry found in nature . With traditional Euclidean geometry theory, it is difficult to adequately describe heterogeneous porous materials, which has led to fractal theory to quantitatively analyze the heterogeneity of pore structures through fractal dimensions. ,,, Multiple pore characterization techniques are available for calculating fractal dimensions. ,, Commonly, the data derived from mercury intrusion and N 2 gas adsorption is employed to calculate fractal dimensions by the Menger sponge model , and Frenkel–Halsey–Hill (FHH) model, , respectively. In fact, fractal dimensions obtained from different data ranges inherently carry specific physical implications. , Hence, fractal analysis can elucidate the physical processes underlying experiments .…”

Section: Introductionmentioning

confidence: 99%

“…33 With traditional Euclidean geometry theory, it is difficult to adequately describe heterogeneous porous materials, which has led to fractal theory to quantitatively analyze the heterogeneity of pore structures through fractal dimensions. 5,27,34,35 Multiple pore characterization techniques are available for calculating fractal dimensions. 17,19,36 Commonly, the data derived from mercury intrusion and N 2 gas adsorption is employed to calculate fractal dimensions by the Menger sponge model 18,32 and Frenkel− Halsey−Hill (FHH) model, 5,37 respectively.…”

Section: Introductionmentioning

confidence: 99%

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Scale-Dependent Fractal Properties and Geological Factors for the Pore Structure in Shale: Insights from Field Emission Scanning Electron Microscopy and Fluid Intrusion

Feng,

Li,

Zhu

et al. 2023

Energy Fuels

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Cost-effective pore characterization is essential for understanding gas storage and flow in shale reservoirs. Herein, we thoroughly investigated the pore structure of Qiongzhusi shale from Northeastern Yunnan, China, utilizing field emission scanning electron microscopy, high-pressure mercury intrusion porosimetry (HP-MIP), and low-pressure gas adsorption (LP-N 2 /CO 2 GA). Scale-dependent fractal properties were identified to evaluate the applicability of fluid intrusion methods. Furthermore, geological factors controlling the pore structure were analyzed. Fractal analysis via the Menger sponge model and the Frenkel−Halsey− Hill model revealed scale-dependent fractal features that act as a "fingerprint" to identify sequential stages during measurements. Mercury intrusion was identified in three stages: pore volume filling, matrix compression, and pore structure damage. Matrix compression appeared at approximately 25 MPa, corresponding to 50 nm in pore size; thereby, HP-MIP is unreliable for characterizing pores below 50 nm. Likewise, N 2 adsorption was identified in four stages: micropore filling, monolayer adsorption, multilayer adsorption, and capillary condensation. As the fractal dimensions from the micropore filling stage are invalid for certain samples, LP-N 2 GA is inadequate for micropore characterization. To cover full-scale pore size distribution (PSD), LP-CO 2 GA, LP-N 2 GA, and HP-MIP were employed to characterize micropores (<2 nm), mesopores (2−50 nm), and macropores (>50 nm), relatively. The resulting PSDs are unimodal or bimodal, with peaks at 0.3−1.0 and 5−20 nm. The Qiongzhusi shale contains interparticle pores along brittle mineral edges and within clay interlayers, intraparticle pores within pyrite framboids and dissolutionrelated minerals, and organic matter (OM) pores with varying morphologies influenced by surrounding minerals. OM and quartz were found to promote pore development, with quartz-based frameworks protecting internal OM pores from compaction-induced damage. However, clays demonstrate a multifaceted impact on pore structure, with interlayer pores between illite−smectite mixed layers contributing to pore volume, while illites negatively affect pore volume. This study provides valuable insights into full-scale pore characterization and shale reservoir evaluation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scale-Dependent Fractal Properties and Geological Factors for the Pore Structure in Shale: Insights from Field Emission Scanning Electron Microscopy and Fluid Intrusion

Feng,

Li,

Zhu

et al. 2023

Energy Fuels

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“…The floc structure and formation carried typical fractal features, due to the high irregularity of floc surface and interior. Therefore, the fractal theory was introduced to depict the floc realistically and illustrate its formation process [20][21][22]. The fractal dimension of flocs can be calculated based on the relationship between the maximum floc length and the projected area [23].…”

Section: Fractal Dimension Of Hematite Flocsmentioning

confidence: 99%

Selective Flocculation Separation of Fine Hematite from Quartz Using a Novel Grafted Copolymer Flocculant

et al. 2018

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Beneficiation of ultrafine mineral particles (typically with an average size less than 20 µm) remains a critical problem for the mineral processing industry. Selective flocculation technique has been found to show great potential to tackle this problem, whose success mainly depends on the selective adsorption of a flocculant on the target mineral particles. In this work, a novel copolymer flocculant was synthesized by grafting starch and acrylamide, which for the first time, was employed in the flocculation separation of fine hematite from quartz. The composites of the grafted copolymer flocculant (GCF) were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The single mineral flocculation results showed that at the pH of 10-11 and GCF concentration of 125 mg/L, hematite flocs with a compact texture were formed, whose average diameter and fractal dimension reached 36 µm and 2.02, respectively; while quartz flocs were barely observed, and the average diameter of particles stayed at approximately 20 µm. Furthermore, the selective flocculation separation was confirmed in the mixed mineral flocculation. From adsorption tests and zeta potential measurements, it is shown that GCF tended to adsorb more selectively and intensely on hematite surfaces compared with quartz. This study provides a valuable reference for the efficient recovery of fine hematite particles.

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“…O aumento da área superficial específica BET mostra que a superfície BET está relacionada com o teor de matéria orgânica e a sua evolução durante o tratamento térmico. Quanto maior for o teor de matéria orgânica, menor é a área de superfície específica(HAKI et al, 2017) Haki et al (2017). comentam também que, para temperaturas acima de 300 °C, o querogênio se decompõe em novas fases de hidrocarbonetos no interior das partículas de xisto, tornando-se quebradiços.…”

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Estudo do xisto avaliando a modelagem cinética e caracterização da pirólise

Foltin¹

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Agradeço primeiramente a Deus por me guiar, iluminar e me dar tranquilidade para seguir em frente com os meus objetivos e não desanimar com as dificuldades.Ao Guilherme Nardin Prado, meu eterno namorado e futuro esposo, sei que sem ele este trabalho não seria o mesmo. Obrigada pela motivação, pela insistência em continuar trabalhando nos erros, pela paciência e ajuda.A minha família e amigos, que fizeram parte durante todo esse trajeto do doutorado, desde as aulas até este trabalho final, e a todas as pessoas que fizeram de alguma forma parte deste trabalho, contribuindo para o meu crescimento e desenvolvimento pessoal. Às pessoas as quais conheci durante minha experiência fora do país, que colaboraram e ajudaram no meu crescimento profissional durante o doutorado sanduíche na Universidade de Alberta. Ao professor Doutor Arno de Klerk, que orientou o trabalho durante minha permanência na Universidade de Alberta. Ao meu orientador e amigo, Antonio Carlos Luz Lisbôa. Acredito que para realmente dar certo, ter uma ligação pessoal e profissional com quem trabalha é sinal de que estamos no caminho certo. Ao Conselho Nacional de Pesquisa e Desenvolvimento CNPq, pelo apoio financeiro e ao Ciências sem Fronteiras pelo doutorado sanduíche. RESUMO A matéria orgânica no xisto está estreitamente disseminada com a matéria mineral, podendo ser liberada por pirólise. O xisto possui querogênio, matéria orgânica que pode ser convertida em óleo de xisto através do processo de pirólise. Alternativas estão sendo estudadas para o petróleo, entre as quais o xisto, que por meio do processo de pirólise possibilita produzir os similares derivados do petróleo. Este trabalho descreve as características da cinética de pirólise de xisto da Formação Irati, através de ajuste dos modelos dos parâmetros do processo e de sua caracterização, fornecido pela Unidade de Negócios da Industrialização do Xisto (SIX), PETROBRAS, localizada na cidade de São Mateus do Sul, Paraná. Análise Termogravimétrica (TGA) foi utilizada para estudar o comportamento da pirólise de xisto utilizando-se temperaturas de 100 °C a 900 °C. Os parâmetros cinéticos energia de ativação e fator pré-exponencial foram calculados através dos modelos de Coats-Redfern, Friedman, Kissinger, Kissinger-Akahira-Sunose (KAS) e o método de Flynn-Wall-Ozawa (FWO). A partir destes modelos propostos pela literatura foram estudados os dados a fim de se obter resultados compatíveis para uma possível otimização do processo. Além disso, outras análises como Difração de Raio -X, Fluorescência de Raio-X, Calorimetria de Varredura Diferencial (DSC) e Espectroscopia de Infravermelho por Transformada de Fourier (FT-IR), foram de fundamental importância para as conclusões. Os resultados obtidos foram correlacionados entre si e mostraram o comportamento do xisto no processo de pirólise. Palavras-chave: cinética, model fitting, model-free, pirólise, xisto.

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Assessment of the pyrolysis, combustion and fractal dimension of fragmented oil shale particles

Cited by 11 publications

References 22 publications

Scale-Dependent Fractal Properties and Geological Factors for the Pore Structure in Shale: Insights from Field Emission Scanning Electron Microscopy and Fluid Intrusion

Scale-Dependent Fractal Properties and Geological Factors for the Pore Structure in Shale: Insights from Field Emission Scanning Electron Microscopy and Fluid Intrusion

Selective Flocculation Separation of Fine Hematite from Quartz Using a Novel Grafted Copolymer Flocculant

Estudo do xisto avaliando a modelagem cinética e caracterização da pirólise

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