Investigation of co-combustion behavior of Robinia pseudoacacia char with anthracite in oxygen-enriched condition

Guang Yang, Yiran Liu, Lijuan Gao, Yingjie Su

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Co-combustion of biochar with coal has the high potential to increase renewables in the carbon-intensive and energy-intensive industries. In this study, the combustion behavior of anthracite (AN), Robinia pseudoacacia char (RPC) and their blends were studied by thermogravimetry analysis. The ignition temperature (647 K) of RPC was lower than AN (723 K), lower ignition temperature and a longer burning time were observed by adding RPC. Simultaneously, the flammability index (C) and comprehensive combustion characteristic index (S) of RPC and AN were analogous, such as CRPC (7.506 × 10−5), CAN (6.244 × 10−5), SRPC (11.525 × 10−7) and SAN (11.143 × 10−7). At a same time, the interaction effect were observed during the co-combustion process, and the positive interaction effect was found to be strongest at 763 K with a blending ratio of 20RPC80AN. The kinetic methods of Coats–Redfern, MacCallum–Tanner, Freeman–Carroll, Madhusudanan–Krishan–Ninan, Flynn–Wall–Ozawa and Zavkovic were applied to calculate the kinetic parameters and the mechanism function models of co-combustion was determined by Malek method. The activation energy (102.91 kJ mol−1) of RPC was lower than AN (165.36 kJ mol−1), it has been found that the activation energy their blends was reduced by adding RPC. In addition, based on these six models, the rationality of kinetic results was verified by Kinetic Compensation Effect, indicating that the activation energy of the blends of different proportions has a good compensation relationship with the pre-exponential factor. Graphical abstract: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)12883-12895
Number of pages13
JournalJournal of Thermal Analysis and Calorimetry
Volume147
Issue number22
DOIs
Publication statusPublished - Nov 2022
Externally publishedYes

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