文献类型：期刊文献

英文题名：Hydrothermal carbonization of rape straw: Effect of reaction parameters on hydrochar and migration of AAEMs

作者：Cheng, Chen[1];He, Qing[1];Ismail, Tamer M.[2];Mosqueda, Alexander[3];Ding, Lu[1];Yu, Junqin[1];Yu, Guangsuo[1,4]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Suez Canal Univ, Dept Mech Engn, Ismailia, Egypt;[3]Mindanao State Univ Iligan Inst Technol, Dept Chem Engn & Technol, Iligan 9200, Philippines;[4]Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gre, Yinchuan 750021, Ningxia, Peoples R China

年份：2022

卷号：291

外文期刊名：CHEMOSPHERE

收录：;EI(收录号：20214611155000);WOS:【SCI-EXPANDED(收录号:WOS:000757882300001)】；

基金：This work was supported by National Natural Science Foundation of China (21878093) , Project of the Key research plan of Ningxia (2021BEE03011) , Program and International Science and Technology Innovation Project between Governments (2021YFE0108900) and the Fundamental Research Funds for the Central Universities (JKB012011013) .

语种：英文

外文关键词：Hydrothermal carbonization; Structure; Kinetics; AAEMs; Hydrochar

摘要：Hydrothermal carbonization (HTC) can improve biomass quality in both physical and chemical aspects for energy application. This study aims to investigate the characteristics and reactivities of rape straw (RS) hydrochars. Hydrochars were prepared at 160-240 degrees C with residence time of 15-120 min. Mass yield, energy yield, microstructure, functional group and migration of alkali and alkaline earth metals (AAEMs) were studied to evaluate the influence of different conditions on properties of hydrochar. The results showed that O/C and H/C ratio decreased, while the higher heating value (HHV) increased with increasing temperature and residence time. The effect of increasing temperature on hydrochar properties was more significant than residence time. The structure was changed, and hydrochar possessed a more stable form after the aromatization reaction. For the gasification reactivity of hydrochar, decomposition rate curves showed that the peak of pyrolysis and gasification moved to a higher temperature region with the increasing of HTC temperature because of the developed aromatic structures in hydrochar. The pyrolysis activation energy decreased from raw RS 71.68 to 41.03 kJ/mol in 240 degrees C, while gasification activation energy increased from 80.42 to 251.30 kJ/mol. Moreover, it was found that HTC can reduce the content of AAEMs efficiently and the best removal condition is 200 degrees C. Ca content dropped to a minimum value at 200 degrees C and then increased at higher temperature which may be caused by well-developed pore structure in hydrochars. This study provides basic data for comprehensive utilization of rape straw and migration mechanism of AAEMs in HTC process.