文献类型：期刊文献

英文题名：Process analysis and kinetic modeling of coconut shell hydrothermal carbonization

作者：Cheng, Chen[1];Ding, Lu[1];Guo, Qinghua[1];He, Qing[1];Gong, Yan[1];Alexander, Kozlov N.[2];Yu, Guangsuo[1,3]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Russian Acad Sci, Siberian Branch, Melentiev Energy Syst Inst, Irkutsk, Russia;[3]Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gre, Yinchuan 750021, Ningxia, Peoples R China

年份：2022

卷号：315

外文期刊名：APPLIED ENERGY

收录：;EI(收录号：20221411925525);WOS:【SCI-EXPANDED(收录号:WOS:000793705900002)】；

基金：This work was supported by Program and International Science and Technology Innovation Project between Governments (2021YFE0108900), National Natural Science Foundation of China (21878093), Belt & Road Young Scientist Exchange Project Supported by Fund of Shanghai Science and Technology Committee (20230742400), and Pujiang Talent Program Supported by Fund of Shanghai Science and Technology Committee (20PJ1402800).

语种：英文

外文关键词：Hydrothermal carbonization; Kinetics; Coconut shell; Potassium migration

摘要：Hydrothermal carbonization is a promising renewable technology to produce high quality solid biofuel with characters of sterilization, micronization, and homogeneous. In this work, coconut shell was used as feedstock to investigate the products distribution, reaction kinetics and the migration of potassium during HTC process. Experiments were carried out in 180-240 ? with residence time of 0-5 h. The results showed that the content of fixed carbon increased from 20.76 wt% to 49.80 wt%, and HHV increased from 20.75 MJ/kg to 31.77 MJ/kg at 240 ? with the holding time of 3 h. The ratio of H/C dropped from 1.78 to 0.86 and O/C dropped from 0.68 to 0.16 which all indicated the improvement of fuel performance. The effects of increasing temperature and prolonging residence time on the products were in the same direction but different in severity. The properties of the products changed little after the residence time was more than 1 h. In addition, chemical fractionation method was used to investigate migration behavior of potassium. The best removal temperature of potassium was 200 C which decreased potassium concentration from 2.7 mg/g to 0.6 mg/g specifically. Due to the increase of specific surface and porosity caused by high temperature, the content of potassium rose slightly at 220 and 240 C. A kinetic model was adopted to predict the products distribution and yield of solid phase and gas phase. The activation energies (Ea) of different reaction paths were calculated and the results showed that Ea of gas formation is greater than that of solid. Migration behavior of potassium and modeling of HTC process is of great significance for design, optimization of industrial HTC reactor and selecting the best time for discharging and feeding to achieve better performance.