Several compositions of the Cu_(3)NbS_(4−x)Se_(x)(x=0,0.1,0.2,0.4,0.6,0.8,and 4)series were synthesized through combination of the elements using conventional solid-state reactions.X-ray powder diffraction patterns su...Several compositions of the Cu_(3)NbS_(4−x)Se_(x)(x=0,0.1,0.2,0.4,0.6,0.8,and 4)series were synthesized through combination of the elements using conventional solid-state reactions.X-ray powder diffraction patterns suggest that the synthesized polycrystalline powder samples are isostructural to sulvanite(Cu_(3)VS_(4)).展开更多
Pelletization reduces storage and transportation costs and improves the thermal efficiency,making it a key technology for the efficient utilization of biomass energy.However,there are few comparative investigations on...Pelletization reduces storage and transportation costs and improves the thermal efficiency,making it a key technology for the efficient utilization of biomass energy.However,there are few comparative investigations on how pelletization affects biomass thermal degradation in the combustion process.In this study,five types of fuels with different mixing ratios of wood sawdust and peanut shells were prepared.Powder and pellet samples were combusted using a custom-designed macro-TGA.The combustion characteristics,kinetics,and thermodynamic parameters were discussed.The results show that pelletization increases the ignition difficulty and prolongs combustion time.Compared with that of the powder sample,the weight loss peak of the pellet sample moved towards a higher temperature.The apparent activation energy for pellet samples was 20-38%lower than that of powder samples.The results prove that biomass pellets have better combustion performances than biomass powders in the macro-TGA.展开更多
基金supported by the National Science Foundation under Award DMR-1561008.E.C.and P.F.P.P.gratefully acknowledge financial support for electrical conductivity and thermopower measurements from the Department of Energy,Office of Basic Energy Sciences under Award#DE-SC-0008574.J.A.Aitken and S.S.Stoyko acknowledge funding from the National Science Foundation under grant DMR-1611198.
文摘Several compositions of the Cu_(3)NbS_(4−x)Se_(x)(x=0,0.1,0.2,0.4,0.6,0.8,and 4)series were synthesized through combination of the elements using conventional solid-state reactions.X-ray powder diffraction patterns suggest that the synthesized polycrystalline powder samples are isostructural to sulvanite(Cu_(3)VS_(4)).
基金supported by Tsinghua University-Toyota Research Center(TT-2022-S02)Beijing Key Laboratory of Indoor Air Quality Evaluation and Control,and Key Laboratory of Eco Planning&Green Building(Tsinghua University),Ministry of Education of China.
文摘Pelletization reduces storage and transportation costs and improves the thermal efficiency,making it a key technology for the efficient utilization of biomass energy.However,there are few comparative investigations on how pelletization affects biomass thermal degradation in the combustion process.In this study,five types of fuels with different mixing ratios of wood sawdust and peanut shells were prepared.Powder and pellet samples were combusted using a custom-designed macro-TGA.The combustion characteristics,kinetics,and thermodynamic parameters were discussed.The results show that pelletization increases the ignition difficulty and prolongs combustion time.Compared with that of the powder sample,the weight loss peak of the pellet sample moved towards a higher temperature.The apparent activation energy for pellet samples was 20-38%lower than that of powder samples.The results prove that biomass pellets have better combustion performances than biomass powders in the macro-TGA.
