Department of Mechanical Engineering, Chiang Mai University, Chiang Mai 50200, Thailand.
Department of Chemical Engineering, University of South Carolina, Columbia, SC 29201, USA.
Bioresour Technol. 2019 Aug;285:121330. doi: 10.1016/j.biortech.2019.121330. Epub 2019 Apr 10.
Corn residue pellets were torrefied with wet flue gas, simulated by steam (0-21% v/v), CO (12% v/v), and O (4% v/v), balanced with N as reactive gas, in a fixed bed reactor at 260 °C of temperature and at 10-40 min of residence time. The distribution and yields of torrefied pellets, liquid, and gas products were examined. The microstructural changes of torrefied pellets were evaluated by Raman spectroscopy and scanning electron microscopy, while the components of gas products were analyzed by mass spectrometry. Residence time and steam concentration in the reactive gas were found to have significant effects on the products yield distribution, the porosity of the torrefied pellets, and the concentrations of CO, CH, H, and CO in the gas products. At high steam concentrations, the decomposition reaction of hemicellulose and lignin in the raw pellets, and the formation of the graphene structures in torrefied pellets occurred faster.
玉米秸秆颗粒用湿烟道气进行热解，烟道气模拟物为蒸汽（0-21%v/v）、CO（12%v/v）和 O（4%v/v），氮气作为反应性气体平衡，在温度为 260°C 和停留时间为 10-40min 的固定床反应器中进行。考察了热解颗粒、液体和气体产物的分布和产率。通过拉曼光谱和扫描电子显微镜评估了热解颗粒的微观结构变化，通过质谱分析了气体产物的成分。发现反应性气体中的停留时间和蒸汽浓度对产物产率分布、热解颗粒的孔隙率以及气体产物中 CO、CH、H 和 CO 的浓度有显著影响。在高蒸汽浓度下，原颗粒中的半纤维素和木质素分解反应以及热解颗粒中石墨烯结构的形成更快。
