Structural features and gasification reactivity of biomass chars pyrolyzed in different atmospheres at high temperature

Wang, Guangwei; Zhang, Jianliang; Chang, Weiwei; Li, Rongpeng; Li, Yanjiang; Wang, Chuan

doi:10.1016/j.energy.2018.01.025

Cited by 93 publications

(34 citation statements)

References 27 publications

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“…In general, there is a kinetic phenomenon existing in the process of gasification that activation energy and preexponential factor have the same variation trend, called compensation effect. The compensation effect is considered to occur when there is a linear relationship between ln k 0 and E in the reaction processes . Therefore, according to the values in Table , the fitting straight are plotted in Figure and the values of compensation effect parameter are shown in the figure, it is seen that the values of correlation coefficients are over 0.98.…”

Section: Resultsmentioning

confidence: 99%

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Wei

Liu

Ren

et al. 2018

Asia-Pacific J Chem Eng

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The mechanism on CO 2 gasification reactivity of pine sawdust chars (PS chars) obtained from the different pyrolysis temperatures (873, 973, and 1073 K) is studied on the basis of nonisothermal thermogravimetric method. The order of gasification reactivity is PS char-873 > PS char-973 > PS char-1073. The effect of pyrolysis temperature is depicted by microstructure characterization, and the gasification reactivity is analyzed with nonisothermal kinetic models. The microstructure characterizations of chars are characterized by scanning electron micrograph, Brunauer-Emmett-Teller, Fourier transform infrared, and X-ray diffraction. Results show that the microcrystalline structure of biomass char is the dominant factor for the effect of gasification reactivity with the pyrolysis temperature rising. The kinetic models of Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose are applied to describe the kinetics of gasification process.The average values of activation energy are in close agreement with the two methods. Both of the methods prove that F2 mechanism is applicable to the gasification of PS chars at lower pyrolysis temperature and F1 mechanism at higher pyrolysis temperature. Besides, there is a compensation effect between activation energy and preexponential factor in the CO 2 gasification process.

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Section: Resultsmentioning

confidence: 99%

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Wei

Liu

Ren

et al. 2018

Asia-Pacific J Chem Eng

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“…The microcrystalline structure of char had a great influence on the gasification reaction. Wang et al [24] investigated the gasification characteristics of chars obtained under different conditions. It showed that the gasification reactivity decreased with the increasing of char production temperature, the gasification reactivity of chars was decreased with the increase of ordering degree of carbonaceous structure.…”

Section: Introductionmentioning

confidence: 99%

Steam gasification of Miscanthus derived char: the reaction kinetics and reactivity with correlation to the material composition and microstructure

Tian

Wang

et al. 2020

Energy Conversion and Management

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This work presents a comprehensive study on the steam gasification kinetics and reactivity of Miscanthus chars (MC) prepared at different temperatures (600 °C, 800 °C and 1000 °C) with the correlations to their composition and microstructure. The results showed that the order of gasification reactivity was MC600 > MC800 > MC1000, and the microcrystalline structure and the content of inherent alkali and alkaline earth metals in the MC were the main factors affecting their reactivity under steam gasification. The reactivity also increased with the increase of gasification temperature, and the effect of gasification temperature on the reactivity of MC was far greater than that of the char production temperature. High heating rate could also effectively promote the gasification reactivity of MC. The kinetics of the steam gasification process were analyzed by different modelling methods. The Random pore model (RPM), among the three methods compared, was the most suitable one to describe the kinetics of isothermal gasification process, of which, the activation energies were in the range of 176-203 kJ/mol with a good kinetic compensation effect between activation energy and pre-exponential factor. The master-plots method proved that the F 2 mechanism was suitable for describing the early stage (X<50%) of the MC gasification reaction, and the D 1 mechanism was suitable to the late stage (X >50%) of the MC gasification process.

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“…However, the band frequency of S3 with lowest I D /I G and highest I V /I G is similar to the pure graphite spectra in the published paper. 7,19) It can be indicated that with the deadman coke descending, the degree of coke graphitization increases, especially in the coke and hot metal regions. So the iron permeated into the coke leads to the change of carbon microstructure.…”

Section: Graphitization Of Deadman Cokementioning

confidence: 99%

Coke Microstructure and Graphitization Across the Hearth Deadman Regions in a Commercial Blast Furnace

et al. 2019

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Structural features and gasification reactivity of biomass chars pyrolyzed in different atmospheres at high temperature

Cited by 93 publications

References 27 publications

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Steam gasification of Miscanthus derived char: the reaction kinetics and reactivity with correlation to the material composition and microstructure

Coke Microstructure and Graphitization Across the Hearth Deadman Regions in a Commercial Blast Furnace

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Structural features and gasification reactivity of biomass chars pyrolyzed in different atmospheres at high temperature

Cited by 93 publications

References 27 publications

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO2

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO2

Steam gasification of Miscanthus derived char: the reaction kinetics and reactivity with correlation to the material composition and microstructure

Coke Microstructure and Graphitization Across the Hearth Deadman Regions in a Commercial Blast Furnace

Contact Info

Product

Resources

About

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂