The evolution of coal char structure under the oxy-fuel combustion containing high H 2 O

Yi, Baojun; Zhang, Liqi; Yuan, Qiaoxia; Yan, Shuiping; Chen, Zheng

doi:10.1016/j.fuproc.2016.06.017

Cited by 31 publications

(12 citation statements)

References 37 publications

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“…The carbon conversions of JAC are 100% for 1573 K and 40% for 1273 K in 5 min respectively. Therefore, it is worth noticing that the temperature has an important influence on the combustion process of coal char and the effect of coal types for char combustion cannot be negligible. At 1473 K, the combustion reaction of JAC is accomplished in above 10 min, which is slower than that of YBC.…”

Section: Resultsmentioning

confidence: 99%

Structural evolution and reactivity of coal chars during combustion in oxyfuel atmosphere

Fei

Yang

et al. 2016

Asia-Pacific J Chem Eng

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The coal chars were characterized by laboratory scale fixed bed, thermogravimetric analysis, ultimate analysis, N2 isothermal adsorption/desorption method and Brunauer–Emmett–Teller method. The specific surface area of two coal chars obtained by Brunauer–Emmett–Teller method could be estimated with the help of random pore model. It showed that random pore model had good ability to depict coal char combustion in oxyfuel, and the higher temperature increased the combustion rate of coal char. Specific surface area followed a similar trend to the micropore, indicating that the specific surface area was mainly determined by the micropore, which increased at the initial stage because of a large number of micropore expansion and generation of new pores. Total pore volume showed a maximum at a carbon conversion range of 0.2–0.4. The activation energy (AE) of Jiaozuo anthracite chars varied between 72 and 85 kJ/mol during combustion, and the values of the AE range between 46 and 77 kJ/mol for YBC. At the carbon conversion of >40%, the AE of two coal chars displayed a linear relationship, which was probably attributed to the pore structure variations of coal chars during combustion in oxyfuel. Copyright © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Structural evolution and reactivity of coal chars during combustion in oxyfuel atmosphere

Fei

Yang

et al. 2016

Asia-Pacific J Chem Eng

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“…Specic surface area and pore structure were analyzed using the Accelerated Surface Area and Porosimetry System (ASAP 2020) in accordance with a previously described method. 40 Thermogravimetric analysis (TGA) has been widely used in the study of thermochemical conversion processes. [41][42][43][44] Combustion reactivity experiments were conducted in the simultaneous DSC-TGA Q600.…”

Section: Experimental Methodsmentioning

confidence: 99%

Effect of alkali and alkaline earth metal species on the combustion characteristics of cattle manures

Yuan

Cao

et al. 2018

RSC Adv.

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“…The results indicate that char chemical structures are not only determined by the heating condition, including the heating rate, temperature, and time, but are also strongly dependent on the parent coal property [3,8]. Yi et al (2016) studied the structures of pyrolytic chars from coals of three ranks in a drop tube furnace at 1000°C in an N 2 atmosphere. Their results indicate that the char structures of these coals have significant differences [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Parent Coal Properties on the Pyrolytic Char Chemical Structure: Insights from Micro-Raman Spectroscopy Based on 32 Kinds of Chinese Coals

Chen

Ning²,

Tang³

et al. 2021

Processes

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The chemical structures of pyrolytic chars prepared from 32 kinds of Chinese coals were investigated with micro-Raman spectroscopy in this study. Both first-order and second-order Raman spectra of the chars were curve-fitted and analyzed. The effects of the parent coal properties, including coal rank, volatile, fixed carbon, and ash content, on the pyrolytic char structures were detailed discussed and the correlations between these coal properties and pyrolytic char chemical structures were set up. Multiple-factor analysis was done to propose a comprehensive coal property index that relates well to the pyrolytic char chemical structure. The results indicate that the aromatization degree is the key distinguishable structure of pyrolytic chars prepared from coals with various rank, and the alkyl C−H and aryl C−H structures have no significant difference. The aromatization degree of pyrolytic char decreases with the increase of coal rank, while it increases with the increase of the fixed carbon content in parent coals. The high content of moisture in parent coal can induce condensation of the pyrolytic char, but the inorganic composition probably prevents the condensation of the char. Limited correlations between the coal rank, fixed carbon, moisture and ash content, and the aromatization degree of pyrolytic chars were found. A comprehensive coal property index: (fixed carbon content + moisture content)/(volatile content + ash content) (in air dry basis) combining the coal properties together relates well to the aromatization degree of pyrolytic char and can act as a good indicator for the pyrolytic char chemical structure. This study reveals the effects of the parent coal properties, including coal rank, fixed carbon, moisture, and ash content, on the pyrolytic char chemical structure, and provides a new comprehensive coal property index to predict the pyrolytic char chemical structure.

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The evolution of coal char structure under the oxy-fuel combustion containing high H 2 O

Cited by 31 publications

References 37 publications

Structural evolution and reactivity of coal chars during combustion in oxyfuel atmosphere

Structural evolution and reactivity of coal chars during combustion in oxyfuel atmosphere

Effect of alkali and alkaline earth metal species on the combustion characteristics of cattle manures

Effects of Parent Coal Properties on the Pyrolytic Char Chemical Structure: Insights from Micro-Raman Spectroscopy Based on 32 Kinds of Chinese Coals

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