Multistep process kinetics of the non-isothermal pyrolysis of Moroccan Rif oil shale

Moine, Ely Cheikh; Groune, Khalihena; Hamidi, Adnane El; Khachani, Mariam; Halim, Mohammed; Arsalane, Saı̈d

doi:10.1016/j.energy.2016.09.033

Cited by 74 publications

(25 citation statements)

References 50 publications

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“…Recently, other models based on the Fraser-Suzuki function have allowed new and improved ways to fit kinetic curves. In these studies, independent decomposition profiles of the main components of lignocellulosic biomass were obtained, and the thermal degradation of samples was successfully described after applying the Fraser-Suzuki function [27][28][29][30].…”

Section: Thermogravimetric Data Processing: Deconvolutionmentioning

confidence: 99%

Parametrization of a Modified Friedman Kinetic Method to Assess Vine Wood Pyrolysis Using Thermogravimetric Analysis

et al. 2019

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Common kinetic parameters were obtained for leached and non-leached samples of vine wood biomass. Both samples were considered to have different proportions of cellulose, hemicellulose, and lignin compositions as a result of the leaching process. The two samples were analyzed in terms of pyrolysis kinetic parameters using non-isothermal thermogravimetric analysis. Furthermore, the classic Friedman isoconversional method, a deconvolution procedure using the Fraser–Suzuki function, and a modified Friedman method from a previous study on the delay in conversion degree were satisfactorily applied. The observed difference when the deconvolution technique was applied suggests that the classic Friedman method is not adequate for studying the pyrolysis of individual vine wood biomass components. However, this issue was solved by studying the delay in conversion degree of both biomasses and calculating the kinetic parameters using the resulting information. This procedure was found to be useful for studying and comparing the kinetics of heterogeneous biomasses and has a sound scientific explanation, making this research a basis for future similar studies.

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Section: Thermogravimetric Data Processing: Deconvolutionmentioning

confidence: 99%

Parametrization of a Modified Friedman Kinetic Method to Assess Vine Wood Pyrolysis Using Thermogravimetric Analysis

et al. 2019

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“…decomposition of kerogen into gas and pyrolytic bitumen which further decomposes into oil, gas, and carbonaceous solid residue . Li and Yue have suggested that the parallel reaction model is more feasible to describe the oil shale pyrolysis than overall reaction model, and two and three steps for organic matter decomposition of oil shale have been proposed by Bai et al and Moine et al, respectively . Reaction orders for each step of the first pyrolysis stage are found identically from both oil shales, however the corresponding activation energies of JOS are lower than that of EOS.…”

Section: Resultsmentioning

confidence: 99%

“…The rate equation can be expressed by the Arrhenius equation as:

\frac{d α}{d t} = A e x p true(- \frac{E}{R T} true) {true(1 - α true)}^{n}

where

E

is the activation energy;

R

is the universal gas constant of 8.314 Jmol · K; and

T

is the absolute temperature. However, since the thermal decomposition of solid fuel involves numerous reactions in parallel and in series over the process, multi‐step kinetic models have been proposed to evaluate the pyrolysis behaviour of coal and oil shale in literature, and so the other approach is carried out by a simplified multi‐step model assuming a number of paralleled n th ‐order reactions. The number of steps referring to the amount of kinetic pathways can be typically postulated to be two or three, while a larger number of steps has a risk of overfitting regardless of longer computation times .…”

Section: Methodsmentioning

confidence: 99%

Pyrolysis and char oxidation characteristics of oil shales and coal in a thermogravimetric analyzer

Park

Song

2017

Can J Chem Eng

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Non‐isothermal thermogravimetric analysis was carried out on two different oil shales and sub‐bituminous coal in order to evaluate effects of the fuel properties and compare the reaction characteristics. The samples and their chars after the devolatilization were heated up to 900 °C at a constant heating rate of 10 K/min under inert and oxidizing atmospheres, respectively. Experimental results exhibit distinct behaviour between the samples for both pyrolysis and char oxidation processes. Pyrolysis of oil shale occurs in two temperature regimes corresponding to its organic and mineral degradation, and mineral matter plays important roles in production of the residual char at the second pyrolysis stage and its reactivity to the subsequent char oxidation. Kinetic analysis was performed using the global one‐ and multi‐step models with nth order reaction mechanism. Organic devolatilization processes of coal and oil shale are analyzed by three‐ and two‐step models, respectively, however mineral degradation of oil shale and char oxidation are analyzed by a one‐step model. Finally, a reasonable fit to the experimental data can be achieved for all the samples and their chars at different atmospheres.

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“…In the early stage of oil shale pyrolysis (<200 • C), the heat of the oil shale layer is mainly used to evaporate the interbedded and adsorbed water of clay minerals [31][32][33][34]. To shorten the time of oil shale dehydration, heater H50 is the best choice for heating an oil shale reservoir in the preheating stage.…”

Section: Comprehensive Performancementioning

confidence: 99%

“…In the second stage of oil shale pyrolysis (300-550 • C), kerogen is converted into oil. In the third stage (>600 • C), carbonate and clay minerals decompose [31][32][33][34]. To make full use of the heat injected into an oil shale formation and produce more oil, the heater H50 with a packer at its outlet should be selected to maintain the oil shale in the second stage of pyrolysis.…”

Section: Performance Evaluation Based On the Second Law Of Thermodynamentioning

confidence: 99%

Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis

et al. 2020

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A downhole electric heater, which reduces heat loss along a heat insulation pipe, is a key apparatus used to ignite oil shale underground. Downhole heaters working together with packers can improve the heating efficiency of high-temperature gases, while different packer locations will directly affect the external air temperature of the heater shell and, subsequently, the performance and total cost of the downhole heaters. A device was developed to simulate the external conditions of heater shells at different packer locations. Then, the effects of external air temperature on the performance of a downhole heater with pitches of 50, 160, and 210 mm were experimentally studied. In the test, results indicated that the heater with a packer at its outlet had an accelerated heating rate in the initial stage and decreased temperature in the final stage. Additionally, the lowest heating rod surface temperature and highest comprehensive performance were achieved with minimal irreversible loss and lower total cost when using a downhole electric heater with a packer set at its outlet. In addition, the downhole electric heater with a helical pitch of 50 mm and a packer at its outlet was more effective than other schemes in the high Reynolds number region. These findings are beneficial for shortening the oil production time in oil shale in situ pyrolysis and heavy oil thermal recovery.

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Multistep process kinetics of the non-isothermal pyrolysis of Moroccan Rif oil shale

Cited by 74 publications

References 50 publications

Parametrization of a Modified Friedman Kinetic Method to Assess Vine Wood Pyrolysis Using Thermogravimetric Analysis

Parametrization of a Modified Friedman Kinetic Method to Assess Vine Wood Pyrolysis Using Thermogravimetric Analysis

Pyrolysis and char oxidation characteristics of oil shales and coal in a thermogravimetric analyzer

Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis

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