Biomass pyrolysis TGA assessment with an international round robin

Anca-Couce, Andrés; Tsekos, C.; Retschitzegger, Stefan; Zimbardi, Francesco; Funke, Axel; Banks, Scott W.; Kraia, Tzouliana; Marques, Paula; Scharler, Robert; Jong, Wiebren de; Kienzl, Norbert

doi:10.1016/j.fuel.2020.118002

Cited by 95 publications

(43 citation statements)

References 52 publications

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“…The corresponding TGA and DTG profiles were given in Figures 2 and 3, respectively. For all the followed biomasses, the curves revealed the presence of three identical degradation zones corresponding to the moisture evaporation, the decomposition of the volatile matter and the production of the solid residue, in agreement with previous findings [47,48]. The deshydratation zone is observed at temperature values between room temperature and 105 °C, 108 °C, 90 °C, 145 °C, 90 °C and 110 °C respectively for ZW, AS, OS, VS, DPL and DPT.…”

Section: Thermal Analysissupporting

confidence: 90%

Investigations on potential Tunisian biomasses energetic valorization: thermogravimetric characterization and kinetic degradation analysis

Mabrouki¹,

Abbassi²,

Khiari³

et al. 2022

Comptes Rendus. Chimie

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In this work, six Tunisian local biomasses, namely ziziphus wood (ZW), almond shells (AS), olive stones (OS), vine stems (VS) and date palm leaflets (DPL) and trunks (DPT) were slowly pyrolyzed under inert atmosphere at a heating rate of 5 °C/min through thermogravimetric (TG) analyses. The thermal degradation of samples involves the interaction in a porous media of heat, mass and momentum transfer with chemical reactions. Heat is transported by conduction, convection and radiation and, mass transfer is driven by pressure and concentration gradients. Thermal degradation curves have been studied with minute details for each degradation step. The Coats-Redfern model was used to extract the kinetic parameters from the TG data, then the kinetic parameters such as the activation energy, the pre-exponential factor and the order of the reaction were calculated. Results showed that the total mass losses amounts and kinetics are dependent on the type of the used biomass. Moreover, the devolatilization could be described by the first order model, while the char formation stage was better described by the second and third order reactions model. The physicochemical characteristics of these samples were also determined. The volatile matter (VM) content varies considerably, with values ranging from 67.19% for AS to 77.4% for ZW. The maximum values were obtained for ZW and VS with values of 77.4% and 71.9%, respectively. The lowest value (67.19%) was determined for AS. In addition, the ash contents vary between 0.8% for OS and 5.66% for DPT.

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Section: Thermal Analysissupporting

confidence: 90%

Investigations on potential Tunisian biomasses energetic valorization: thermogravimetric characterization and kinetic degradation analysis

Mabrouki¹,

Abbassi²,

Khiari³

et al. 2022

Comptes Rendus. Chimie

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“…Here, 𝐴 refers to the pre-exponential factor ( 𝑠 −1 ), 𝑅 is the ideal gas constant ( 𝐽 (𝑚𝑜𝑙 𝐾) ⁄ ), and 𝑇 is the reaction temperature ( 𝐾 ). This equation is usually determined by thermogravimetric analysis (TGA) [5]. However, there are many methods such as integral method and differential method to solve the activation energy E value by knowing the conversion degree on the basis of experiments.…”

Section: Forewordmentioning

confidence: 99%

Estimation Method of Biomass Energy Reserves in China: A Case Study of Corn Straw

Miao

2022

J. Phys.: Conf. Ser.

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Nowadays, biomass resources are the best choice to replace fossil resources. Energy development in biomass is mainly through pyrolysis of biomass. At present, no one has estimated how much biomass energy there is for a country. In this article, taking corn as an example, China as the production country, the potential biomass resources in China are speculated, in which Lignocellulose is the main experimental biomass and pyrolyzed to obtain biomass energy. The most common method of biomass energy conversion is isothermal conversion. The first-order reaction model is used for kinetic analysis of the conversion. The sample is subjected to powder falling pyrolysis at 480 degrees. In order to overcome the regional differences in China, the data of 30 degrees north latitude are used. Finally, the reaction time and the total amount of biomass energy available for development and utilization in China in 2020 are obtained.

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“…Samples with around 6 mg were used in each experiment and they were subjected to thermal decomposition from ambient temperature up to 750 °C at 10 °C/min. This low heating rate was applied to avoid transport effects and to ensure that reaction is temperature dependent only, and therefore, the experiments are performed in a pure kinetic regime [6]. These initial conditions were based on previous experiments that were performed to ensure there was no possible effect on mass and heat transfer during the biomass decomposition.…”

Section: Thermogravimentric Experimentsmentioning

confidence: 99%

“…These results depend on several factors, but studies with a low heating rate are able to determine the temperatures from which the pyrolytic reactions start more precisely and to avoid transport effects [6]. In addition to factors such as final temperature and heating rate, first stated by Williams et al [7] as parameters that influence thermal decomposition and the composition of the final products, the atmosphere is also a factor that influences the thermal behavior of biomass.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conversion of Pine Wood and Kinetic Analysis under Oxidative and Non-Oxidative Environments at Low Heating Rate

Fraga¹,

Silva²,

Teixeira³

et al. 2020

The First World Energies Forum—Current and Future Energy Issues

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Atmosphere is one of the most significant factors in the thermal decomposition of biomass. In domestic or industrial biomass boilers, ambient oxygen concentration varies through time, which means that the reaction will change from pyrolysis to combustion. In this way, to analyze and compare each thermochemical conversion process, a simple analytical method, the non-isothermal thermogravimetric analysis, is carried out under oxidative (air) and non-oxidative (argon) environments at 10 °C/min and as a function of different flow rates (2 to 150 mL/min). Additionally, this work was complemented by a kinetic analysis considering a first-order reaction to each conversion stage and using the Coats–Redfern method. The effect of the atmosphere on the thermal decomposition behavior was evident. It was observed that the thermal decomposition of pine wood particles varied from three to two stages when the oxidative or inert atmosphere was applied. The presence of oxygen changes the mass loss curve mainly at high temperature, around 350 °C, where char reacts with oxygen. The maximum mass loss rate from experiments with the oxidative atmosphere is 15% higher than in an inert atmosphere, the average char combustion rate is approximately 5 times higher and the heat released reaches levels 3.44 times higher than in an inert atmosphere. Ignition and combustion indexes were also defined, and results revealed that particles are ignited faster under oxidative atmosphere and that, on average, the combustion index is 1.7 times higher, which reinforces the more vigorous way that the samples are burned and how char is burned out faster in the experiments with air. Regarding the kinetics analysis, higher activation energies, and consequently, lower reactivity was obtained under the oxidative atmosphere for the second stage (~125 kJ/mol) and under the inert atmosphere for the third thermal conversion stage (~190 kJ/mol).

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Biomass pyrolysis TGA assessment with an international round robin

Cited by 95 publications

References 52 publications

Investigations on potential Tunisian biomasses energetic valorization: thermogravimetric characterization and kinetic degradation analysis

Investigations on potential Tunisian biomasses energetic valorization: thermogravimetric characterization and kinetic degradation analysis

Estimation Method of Biomass Energy Reserves in China: A Case Study of Corn Straw

Thermal Conversion of Pine Wood and Kinetic Analysis under Oxidative and Non-Oxidative Environments at Low Heating Rate

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