Thermal Behavior and Kinetics of Shenmu Coal Pyrolyzed under Hydrogen-Rich or Methane-Gas-Rich Atmosphere

Chong Zou, Xi Li, Mengmeng Ren, Weian Wang and Hao Wu ()
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Chong Zou: School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710311, China
Xi Li: School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710311, China
Mengmeng Ren: School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710311, China
Weian Wang: School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710311, China
Hao Wu: School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710311, China

Energies, 2023, vol. 16, issue 5, 1-14

Abstract: The pyrolysis characteristics of Shenmu coal under an atmosphere containing H 2 (40%) and another containing CH 4 (40%) were studied via a thermogravimetric analysis, and the kinetic parameters of pyrolysis were calculated by using a distributed activation energy model (DAEM). The results showed that H 2 promoted the cleavage of CH-like functional groups by providing reactive hydrogen groups to combine with CH groups and –OH groups in the coal. However, the H 2 and CH 4 atmosphere inhibits the cleavage of oxygen-containing functional groups such as carbonyl groups and C–O groups, and this is unfavorable to the production of CO 2 and CO. The pyrolysis weight-loss rate of raw coal decreases with the increase of the heating rate, and the weight-loss curve shifts to the high-temperature region. At the same conversion rate and pyrolysis temperature, the activation energy of pyrolysis under the H 2 and CH 4 atmospheres is lower than that under the N 2 atmosphere, and the activation energy does not conform to the Gaussian distribution. The activation energy of pyrolysis was distributed in a narrow range, in which the activation energy of the H 2 and CH 4 atmospheres was concentrated in the range of 175–215 kJ/mol and 225–230 kJ/mol, respectively, and the activation energy of the H 2 atmosphere was lower than that of the CH 4 atmosphere under the same conversion rate.

Keywords: thermogravimetric analysis; pyrolytic atmosphere; pyrolytic properties; distributed activation energy model (DAEM); activation energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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