化工学报2016，Vol.67Issue(4)：1303-1312,10.DOI:10.11949/j.issn.0438-1157.20151270
废弃咖啡渣化学链气化反应特性
Reaction characteristics of chemical-looping gasification for waste coffee grounds
摘要
Abstract
Iron-based composite oxygen carrier (OC) (Fe4ATP6K1) was prepared by sol-gel method, which features Fe2O3 as an active component, and natural attapugite (ATP) as an inert support, as well as being modified by KNO3. Effects of reaction temperature, flow rate of steam and molar ratio of O/C on chemical looping gasification (CLG) of coffee grounds were investigated in a high temperature fluidized bed using steam as gasification agent. It suggests that the Fe4ATP6K1 oxygen carrier as bed material could facilitate carbon conversion in CLG of coffee grounds from 71.38% to 86.25%, compared with that of SiO2. Under optimized conditions for CLG such as 900℃, 0.23 g·min−1of steam flow rate and 1 of molar ratio of O/C, up to 52.75% of average concentration of H2, 83.79 g·kg−1 of H2 production rate, and 1.30 m3·kg−1 of syngas production rate were achieved. The OC samples before and after reaction at 900℃ were characterized by X-ray diffraction (XRD) and scanning electron microscope-energy dispersive spectrometer (SEM-EDS). The interactions within phases of Fe, K and Si, and K in presence of KFeSi3O8 phase in the OCs were observed. Twenty redox cycles testing demonstrated that the Fe4ATP6K1 oxygen carrier possessed a good cyclic stability, over 75% of both carbon conversion and cold gas efficiency, while the average concentration of each gas kept almost stable.关键词
咖啡渣/颗粒物料/废物处理/化学链气化/铁基载氧体/合成气/流化床Key words
coffee grounds/particle material/waste treatment/chemical-looping gasification/Fe-based oxygen carrier/syngas/fluidized bed分类
能源科技引用本文复制引用
张云鹏,刘永卓,杨勤勤,郭庆杰..废弃咖啡渣化学链气化反应特性[J].化工学报,2016,67(4):1303-1312,10.基金项目
国家自然科学基金项目(21276129)；青岛市应用基础研究计划项目(14-2-4-5-jch)；山东省自然科学基金重点项目（ZR2015QZ02）。@@@@supported by the National Natural Science Foundation of China (21276129), the Applied Basic Research Programs of Science and Technology Commission Foundation of Qingdao(14-2-4-5-jch) and the Natural Science Foundation of Shandong Province(ZR2015QZ02) （21276129）
