CO2 gasification of char derived from waste tire pyrolysis: Kinetic models comparison

Betancur, Mariluz; Arenas, Cindy Natalia; Martínez, Juan Daniel; Navarro, M.V.; Murillo, R.

doi:10.1016/j.fuel.2020.117745

Cited by 43 publications

(14 citation statements)

References 46 publications

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“…The obtained values of the R 2 determination coefficient were high, whi good fit of the measurement data to the models used. The mean values of ki eters for the CO2 tire char gasification (Ea: 182-225 kJ/mol and A: 1.3 × 10 8 -5.8 are similar to some presented in the literature [34][35][36]).…”

Section: Analysis Of Kinetics Of Char Gasification Processsupporting

confidence: 85%

Effect of Pyrolysis Atmosphere on the Gasification of Waste Tire Char

2021

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The aim of the study is to assess the influence of the atmosphere during pyrolysis on the course of CO2 gasification of a tire waste char. Two approaches were used: the pyrolysis step was carried out in an inert atmosphere of argon (I) or in an atmosphere of carbon dioxide (II). The examinations were carried out in non-isothermal conditions using a Rubotherm DynTherm thermobalance in the temperature range of 20–1100 °C and three heating rates: 5, 10 and 15 K/min. Based on the results of the gasification examinations, the TG (Thermogravimetry) and DTG (Derivative Thermogravimetry) curves were developed and the kinetic parameters were calculated using the KAS (Kissinger-Akahira-Sunose) and FWO (Flynn-Wall-Ozawa) methods. Additionally, the CO2 gasification of tire chars reaction order (n), was evaluated, and the kinetic parameters were calculated with the use of Coats and Redfern method. Tire waste char obtained in an argon atmosphere was characterized by lower reactivity, which was reflected in shift of conversion and DTG curves to higher temperatures and higher mean values of activation energy. A variability of activation energy values with the progress of the reaction was observed. For char obtained in an argon atmosphere, the activation energy varied in the range of 191.1–277.2 kJ/mol and, for a char obtained in an atmosphere of CO2, in the range of 148.0–284.8 kJ/mol. The highest activation energy values were observed at the beginning of the gasification process and the lowest for the conversion degree 0.5–0.7.

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Section: Analysis Of Kinetics Of Char Gasification Processsupporting

confidence: 85%

Effect of Pyrolysis Atmosphere on the Gasification of Waste Tire Char

2021

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“…46 In a recent study, the HERPM was found to perform better than the RPM, wherein accurate estimations were possible for conversion rates below 20%; however, the estimations obtained for higher conversion rates were not fully discussed. 47 Table 5. Common Models for the Surface Function f(X) (eqs 3−13) from Romero Millań et al and Dahou et al 34,35 and Gasification Kinetic Models Considering the Effects of Inorganic Elements (eqs 14a−17) from Dahou et al 35 model…”

Section: Co 2 Gasification Kineticsmentioning

confidence: 99%

“…More specifically, the hybrid-extended RPM (HERPM) was proposed to more accurately model the higher conversion rates observed at lower conversion rates . In a recent study, the HERPM was found to perform better than the RPM, wherein accurate estimations were possible for conversion rates below 20%; however, the estimations obtained for higher conversion rates were not fully discussed …”

Section: Kinetic Theorymentioning

confidence: 99%

Hardwood Branch Char Gasification with CO₂: Characterization of Reactivity and Proposal of a Semiempirical Kinetic Model

Koido,

Hoshi,

Sato

2023

Energy Fuels

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Pruned branches (PBs) from fruit trees are the only woody biomass produced in agriculture in Japan and are thus considered a local resource. Yet, the use of fruit-tree PBs to produce energy on a small scale has not been investigated. Here, fuel characteristics of PB char were studied considering its use in gasification for heat and power generation, and a gas−solid reaction model was proposed to describe the CO 2 gasification of char produced from PBs. The reaction rate patterns generated during the CO 2 gasification of the studied char can be broadly classified into those associated with cultivated fruit-tree PBs, park tree PBs, and timber waste. The porous structure of the char indicated that the CO 2 molecules diffused into the pores via Knudsen diffusion, and fruit-tree PBs had a smaller average pore diameter but a higher Brunauer−Emmett−Teller (BET) surface area. In addition, the extended modified random pore model (eMRPM) was proposed as a new gas−solid reaction model. This model describes the peak of gasification rate at the end of gasification more accurately than conventional models. Furthermore, higher K and Ca contents in char resulted in a higher degree of correlation between the eMRPM and experimental data at 800 °C.

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“…The value of ψ is related to the solid material and the formation condition. ,, Moreover, the modified random pore model (MRPM) is the improved pore structure model to simulate the evolution of the superficial area of carbon particles during CO 2 reaction. Different forms of MRPM have been proposed in the literature by introducing a new conversion term and a time function with two or three dimensionless parameters into the original random pore model. ,− We used the equation, which is proposed by Gómez-Barea and Ollero in which the new conversion term and time function have a linear relation with time. It simplifies the equations and lets us find the analytical solution with reasonable results.…”

Section: Mathematical Modelingmentioning

confidence: 99%

Reaction–Diffusion Model for Gasification of a Shrinking Single Carbon-Anode Particle

et al. 2021

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The present work focuses on the gasification of a single carbon-anode particle with CO2, using a detailed reaction-transport model based on the reaction intrinsic kinetics and transport of gaseous species. The model includes the mass conservation equations for the gas components and solid carbon particles, resulting in a set of nonlinear partial differential equations, being solved using numerical techniques. The model may predict the gas generation rate, the gas compositions, and the carbon consumption rate during the gasification of a carbon particle. Five kinetic models were compared to describe the gasification behavior of carbon particles. It was found that the random pore model (RPM) provided the best description of the reactivity of anode particles. The model also predicted the particle shrinkage during the gasification process. The model was validated using experimental results obtained with different particle size ranges, being gasified with CO2 at 1233 K. The experiments were performed in a thermogravimetric analyzer (TGA). Good agreement between the model results and the experimental data showed that this approach could quantify with success the gasification kinetics and the gas distribution within the anode particle. In addition, the Langmuir–Hinshelwood (L–H) model is used in order to capture the inhibition effect of carbon monoxide on the gasification reaction. The effectiveness factor and Thiele modulus simulated for various particle sizes helped assess the evolution of the relative dominance of diffusion and chemical reactions during the gasification process.

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CO2 gasification of char derived from waste tire pyrolysis: Kinetic models comparison

Cited by 43 publications

References 46 publications

Effect of Pyrolysis Atmosphere on the Gasification of Waste Tire Char

Effect of Pyrolysis Atmosphere on the Gasification of Waste Tire Char

Hardwood Branch Char Gasification with CO₂: Characterization of Reactivity and Proposal of a Semiempirical Kinetic Model

Reaction–Diffusion Model for Gasification of a Shrinking Single Carbon-Anode Particle

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CO2 gasification of char derived from waste tire pyrolysis: Kinetic models comparison

Cited by 43 publications

References 46 publications

Effect of Pyrolysis Atmosphere on the Gasification of Waste Tire Char

Effect of Pyrolysis Atmosphere on the Gasification of Waste Tire Char

Hardwood Branch Char Gasification with CO2: Characterization of Reactivity and Proposal of a Semiempirical Kinetic Model

Reaction–Diffusion Model for Gasification of a Shrinking Single Carbon-Anode Particle

Contact Info

Product

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Hardwood Branch Char Gasification with CO₂: Characterization of Reactivity and Proposal of a Semiempirical Kinetic Model