文献类型：期刊文献

英文题名：Structure characteristics and combustion kinetics of the co-pyrolytic char of rice straw and coal gangue

作者：Xu, Chunyan Luo, Chengjia Du, Jun Liu, Lang Wang, Jingjing Yuan, Chenhong Guo, Junjiang

第一作者：Xu, Chunyan

通信作者：Liu, L[1];Liu, L[2]

机构：[1]Guangxi Minzu Univ, Sch Mat & Environm, Nanning 530006, Guangxi, Peoples R China;[2]Guangxi Key Lab Adv Struct Mat & Carbon Neutral, Nanning 530006, Guangxi, Peoples R China;[3]Guangxi Coll & Univ Key Lab Environm Friendly Mat, Nanning 530006, Guangxi, Peoples R China;[4]Guizhou Inst Technol, Chem Engn Inst, Guiyang 550003, Guizhou, Peoples R China

第一机构：Guangxi Minzu Univ, Sch Mat & Environm, Nanning 530006, Guangxi, Peoples R China

通信机构：corresponding author), Guangxi Minzu Univ, Sch Mat & Environm, Nanning 530006, Guangxi, Peoples R China;corresponding author), Guangxi Key Lab Adv Struct Mat & Carbon Neutral, Nanning 530006, Guangxi, Peoples R China.

年份：2024

卷号：14

期号：1

外文期刊名：SCIENTIFIC REPORTS

收录：;Scopus(收录号：2-s2.0-85198659629);WOS:【SCI-EXPANDED(收录号:WOS:001272561200054)】；

基金：This work was supported by the Natural Science Foundation of Guangxi Zhuang Autonomous Region (Guike ZY23055023, 2024GXNSFAA010510), the National Natural Science Foundation of China (52164033) and the Natural Science Foundation of Guizhou Province (Qiankehezhicheng [2022] yiban032) for financial support.DAS:The datasets used and/or analyzed during the current study available from the corresponding author on reasonable request.

语种：英文

外文关键词：Coal gangue; Co-pyrolytic char; Char characteristics; Combustion kinetics

摘要：Co-combustion is a technology that enables the simultaneous and efficient utilization of biomass and coal gangue (CG). Nevertheless, the factors that affect the combustibility of co-pyrolytic char, which represents the rate-determining step of the entire co-combustion process, remain unclear. This study investigates the impact of the physicochemical properties of co-pyrolytic char, including pore structure, carbon structure, and alkali metals, on the combustion characteristics. The TGA analysis indicates that the ignition and burnout temperatures of the co-pyrolytic char increase as the CG mixing ratio increases, resulting in a prolonged combustion. This is due to the fact that the carbon structure of the co-pyrolytic char becomes increasingly aromatic, accompanied by a reduction in aliphatic hydrocarbons and oxygen-containing groups as the CG mixing ratio increases. Furthermore, the high ash content of the CG is another significant factor contributing to the observed reduction in combustibility. The reaction between mullite, quartz in CG, and alkali metals in biomass results in the formation of aluminosilicate, which reduces the catalytic ability of alkali metals. Furthermore, the char combustion kinetics are analyzed by the KAS method, and the results indicate that the introduction of CG increases the activation energy of the entire char combustion process. The activation energy of the 80RS20CG is within the range of 102.22-164.99 kJ/mol, while the RS char is within the range of 89.87-144.67 kJ/mol.