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Chen D.,Anhui Key Laboratory for Biomass Clean Energy at USTC | Zhang D.,Anhui Key Laboratory for Biomass Clean Energy at USTC | Zhu X.,Anhui Key Laboratory for Biomass Clean Energy at USTC
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2010

To study the influence of hot air dry pretreatment for rice husk, the thermogravimetric experimental were carried out in different heating rates. The results showed that the pyrolysis process could be separated into four stages. The TG and DTG curves were moved to the higher temperature scale with the heating rate increasing and the maximum pyrolysis rate was increased obviously. Component analysis, FTIR analysis and scanning electron microscopy results showed that chemical structure had few changes, but the surfaces structure of the rice husk were changed obviously. Drying is conducive to the generation of volatile. At last, the kinetic parameters such as activation energy and frequency factor were presented. Source


Chen D.,Anhui Key Laboratory for Biomass Clean Energy at USTC | Zhang D.,Anhui Key Laboratory for Biomass Clean Energy at USTC | Zhu X.,Anhui Key Laboratory for Biomass Clean Energy at USTC
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2011

The research progresses of kinetic analysis and heat transfer of biomass drying were summarized. As the main research method, empirical or semi-empirical models were widely used in drying kinetics. Six empirical models which were used to simulate the drying process of corn stalk powder were evaluated based on the coefficient of determination and reduced chi-square. Midilli et al. model was found to be the best for describing the isothermal drying kinetics. Moisture transport is accompanied by heat transfer. Heat flow of drying included three different parts, and the main part corresponded to moisture evaporation. The simulation results of heat requirements were in good agreement with the experimental data. Source


Chen D.,Anhui Key Laboratory for Biomass Clean Energy at USTC | Zhang D.,Anhui Key Laboratory for Biomass Clean Energy at USTC | Zhu X.,Anhui Key Laboratory for Biomass Clean Energy at USTC
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2011

Ultimate analysis and component analysis were carried out for corn stalk powder. Isothermal drying experiments and caloric requirement experiments were carried out by thermal analyzer to study the drying mechanism of heat and mass transfer. And then quantitative analysis was studied for drying heat flow. The results showed that taking the maximum drying rate as the threshold, the process of drying could be divided into raising rate stage and falling rate stage. DSC curve and the drying process had a clear correlation. Drying caloric from 380 kJ to 620 kJ was required for 1 kg wet stalk (moisture content 20%~40%) drying at 90°C, and from 210 kJ to 610 kJ was required for 1kg wet stalk (moisture cntent 25%) drying at 50~110°C. Source

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