Numerical Simulation of In Situ Combustion of Oil Shale

Zheng, Huan; Shi, Weiping; Ding, Dali; Zhang, Chuangye

doi:10.1155/2017/3028974

Cited by 27 publications

(10 citation statements)

References 22 publications

(32 reference statements)

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“…The governing equations that describe the reacting multiphase flow, which occurs during the ISC process, are those of the continuity equation, the energy conservation equation, and the chemical reaction equation, which is modeled following the Arrhenius law. , The chemical reaction model is an important part of these equations and is presented in the subsequent discussions.…”

Section: Methodsmentioning

confidence: 99%

Kinetics of Thermal Decomposition of Tar in the Presence of Air and Nitrogen Gas

et al. 2019

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Thermogravimetric analysis (TGA) provides useful information, which can be used in thermal processing and conversion kinetic modeling of materials, including hydrocarbons. In the present study, a series of TGA experiments were conducted in the presence of air (combustion) and under inert conditions (pyrolysis) using nitrogen gas with the focus of obtaining quantitative information to compare thermal decomposition characteristics of the two processes. The analysis was performed at different gas injection rates (10–50 mL/min) and heating rates (10–30 °C/min) under non-isothermal conditions from 30 to 600 °C. It was observed that the gas injection rates did not have significant impact on the thermal decomposition of the tar sample. However, increasing the heating rate shifted the peak temperatures of the reactions to higher temperatures. In addition, the combustion process generally has a higher conversion and peak rate of conversion than the pyrolysis process. Moreover, the activation energy, E a (kJ mol–1), obtained for the combustion process was observed to be higher than those of the pyrolysis.

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Section: Methodsmentioning

confidence: 99%

Kinetics of Thermal Decomposition of Tar in the Presence of Air and Nitrogen Gas

et al. 2019

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“…Oil shale is a black or brown flaky structure with a dense texture, which is rich in organic kerogen. The shale oil produced from the pyrolysis of oil shale is similar to natural petroleum; thus, oil shale is a high-quality source rock [5]. And, oil shale has become an important strategic reserve resource and supplementary energy in China [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Atmosphere on the Pyrolysis Behavior and Oil Quality of Jimusar Oil Shale

Kang

Wang

et al. 2022

Geofluids

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High-temperature H2O and CO2 can improve the pyrolysis behavior of oil shale. Therefore, in this paper, Jimusar oil shale was selected as the research object and the effect of the reaction atmosphere (H2O, CO2, and N2) on its pyrolysis behavior, pyrolysate distribution, and pyrolysis oil quality was fully compared and studied. The results showed that compared with the N2 atmosphere, the presence of H2O and CO2 both increased the weight loss and weight loss rate during pyrolysis of oil shale and the existence of H2O advanced the initial precipitation temperature of volatiles by 17°C. The comprehensive release characteristic indices of volatiles during pyrolysis of oil shale in the CO2 and H2O atmospheres increased by 49.34% and 114.35%, respectively, which significantly improved its pyrolysis reactivity. Both H2O and CO2 atmospheres improved the pyrolysis oil yield of oil shale, and the pyrolysis oil yield in the H2O atmosphere performed better than that in the CO2 atmosphere. Especially, the H2O atmosphere could increase the pyrolysis oil yield by 41.42%. The existence of CO2 prevented methyl radicals from accepting hydrogen radicals during pyrolysis and reduced the alkane yield, while CO2 participated in the addition reaction of alkane, which increased the alkene yield. High-temperature H2O provided more hydrogen source, which increased the alkane yield and inhibited the alkene formation. Both H2O and CO2 atmospheres promoted the cracking of polycyclic aromatics and increased the yield of small-molecular aromatics in the pyrolysis oil. During the pyrolysis process of oil shale, CO2 and H2O underwent reforming reaction with the heavy oil, which increased the light component fraction, thereby increasing the H/C ratio of pyrolysis oil. Thus, the existence of H2O and CO2 atmospheres improved the quality of pyrolysis oil and the effect of H2O was better than CO2. The H2O and CO2 atmosphere promoted the formation of a well-developed pore structure, which was conducive to mass and heat transfer during pyrolysis of oil shale.

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“…Thus, thermal flows were included in numerical studies on porous media flows with heterogeneous reaction. Field-scale modeling of solid coke combustion suggested the important role of heat conduction in stabilizing the combustion front [29] and identified key factors influencing the coke combustion rate and the front sweep efficiency [30,31].…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann Simulation of Multicomponent Porous Media Flows With Chemical Reaction

Lei

Luo

2021

Front. Phys.

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Flows with chemical reactions in porous media are fundamental phenomena encountered in many natural, industrial, and scientific areas. For such flows, most existing studies use continuum assumptions and focus on volume-averaged properties on macroscopic scales. Considering the complex porous structures and fluid–solid interactions in realistic situations, this study develops a sophisticated lattice Boltzmann (LB) model for simulating reactive flows in porous media on the pore scale. In the present model, separate LB equations are built for multicomponent flows and chemical species evolutions, source terms are derived for heat and mass transfer, boundary schemes are formulated for surface reaction, and correction terms are introduced for temperature-dependent density. Thus, the present LB model offers a capability to capture pore-scale information of compressible/incompressible fluid motions, homogeneous reaction between miscible fluids, and heterogeneous reaction at the fluid–solid interface in porous media. Different scenarios of density fingering with homogeneous reaction are investigated, with effects of viscosity contrast being clarified. Furthermore, by introducing thermal flows, the solid coke combustion is modeled in porous media. During coke combustion, fluid viscosity is affected by heat and mass transfer, which results in unstable combustion fronts.

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Numerical Simulation of In Situ Combustion of Oil Shale

Cited by 27 publications

References 22 publications

Kinetics of Thermal Decomposition of Tar in the Presence of Air and Nitrogen Gas

Kinetics of Thermal Decomposition of Tar in the Presence of Air and Nitrogen Gas

Investigation on the Effect of Atmosphere on the Pyrolysis Behavior and Oil Quality of Jimusar Oil Shale

Lattice Boltzmann Simulation of Multicomponent Porous Media Flows With Chemical Reaction

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