Nowadays, the amount of waste textiles (WT) was increasing due to the increase in population, thermochemical processes owe the potential to process WT on large-scale. However, tar removal is the key to industrial thermochemical treatment. Molten carbonates pyrolysis technology is proposed to remove WT tar in this study. The result showed that molten carbonates favor catalytic reaction medium for turning tar into char and small molecular pyrolysis gases (including H 2 , CO, and CO 2 ), meanwhile, excellent heat and mass transfer performance of molten carbonates can also reinforce the reaction. 94.95 wt% of tar was removed at 550 °C with flow rate of 0.15 L/min. Molten carbonates not only promoted decarboxylation of acid in tar, but also enhanced the reaction between coke and carbon dioxide, which in return benefits lifetime of molten carbonates, so after recycling eight times, tar removal rate was still above 90 %. The kinetic study suggested that lower flow rate laid positive influence on tar elimination by contributing to mass and heat transfer inside the bubbles.
Deng Zhao,Tianyu Wu,Jiantao Wang,Shuo Ling,Huashan Wang,Hua Liu,Hui Liu,Shuai Guo,Xiudong Wei
Currently the thermal effect of light has received extensive attention in the field of concentrating solar power gasification, but the non-thermal effect of light has been neglected. In this study, a high-flux solar simulator was coupled with a thermogravimetric analyzer and the thermal effects of concentrating solar power were effectively controlled. The non-thermal effect of concentrating solar power on the gasification of char was studied for the first time. It was found that the non-thermal effect of concentrating solar power significantly reduced the gasification reaction temperature and activation energy of the samples. The reaction mechanism of non-thermal effect was proposed by analyzing the microstructure and chemical structure of the samples with equal conversion rate. The self-catalysis of graphite carbon under high radiation intensity promotes the pyrolysis of biomass carbon to form a highly active carbon chain structure to promote the gasification reaction. This study proves the importance of non-thermal effects in the field of concentrating solar power gasification research, and direct irradiation may have higher economic benefits than indirect irradiation. However, the quantitative description of this non-thermal effect needs further study.
Haoran Xu,Bin Chen,Houcheng Zhang,Peng Tan,Guangming Yang,John T.S. Irvine,Meng Ni
In this paper, 2D models for direct carbon solid oxide fuel cells (DC-SOFCs) with in situ catalytic steam-carbon gasification reaction are developed. The simulation results are found to be in good agreement with experimental data. The performance of DC-SOFCs with and without catalyst are compared at different operating potential, anode inlet gas flow rate and operating temperature. It is found that adding suitable catalyst can significantly speed up the in situ steam-carbon gasification reaction and improve the performance of DC-SOFC with H 2 O as gasification agent . The potential of syngas and electricity co-generation from the fuel cell is also evaluated, where the composition of H 2 and CO in syngas can be adjusted by controlling the anode inlet gas flow rate. In addition, the performance DC-SOFCs and the percentage of fuel in the outlet gas are both increased with increasing operating temperature. At a reduced temperature (below 800 °C), good performance of DC-SOFC can still be obtained with in-situ catalytic carbon gasification by steam. The results of this study form a solid foundation to understand the important effect of catalyst and related operating conditions on H 2 O-assisted DC-SOFCs.
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