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Hu Y.-S.,Gansu Yinguang Chemistry Corporation | Zhang Y.-X.,Nanjing University of Science and Technology | Zhou S.-W.,Gansu Yinguang Chemistry Corporation | Zhang L.-Y.,Gansu Yinguang Chemistry Corporation | Chen H.-H.,Nanjing University of Science and Technology
Tuijin Jishu/Journal of Propulsion Technology | Year: 2015

Experiments and numerical calculations were conducted to investigate the continuous drying characteristics and dynamics of RDX. The drying characteristics of RDX with initial moisture content 6% were investigated in a continuous drying equipment. In order to estimate and select the suitable form of RDX drying curves, the curves were fitted to some different semi-theoretical and/or empirical thin-layer drying models and coefficients are evaluated by non-linear regression analysis. Moisture content, static electricity and temperature in the drying process were on-line monitored. Furthermore, Fick diffusion equation was used to determine the effective diffusion coefficient in the drying process of RDX. The results indicate that, there is a falling rate period after a short warm-up period and no constant rate period is observed. The moisture content of the product obtained is less than 0.1%, satisfying the product demand. It is deduced that Midilli-Kucuk model has shown a better fit to the experimental drying data as compared to other models. The surface electrostatic charge and temperature distribution of the drying and cooling layer of RDX is rather acceptable for the safe operation. The drying efficiency is improved with the effective diffusion coefficient up to the order of 10-8. ©, 2015, Editorial Office of Journal of Propulsion Technology. All right reserved. Source


Zhang Y.-X.,Nanjing University of Science and Technology | Chen H.-H.,Nanjing University of Science and Technology | Hu Y.-S.,Gansu Yinguang Chemistry Corporation | Zhou S.-W.,Gansu Yinguang Chemistry Corporation | Zhang L.-Y.,Gansu Yinguang Chemistry Corporation
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2014

The drying experiments of RDX were conducted in a newly developed drying-cooling integrated machine. Distribution of moisture content, static electricity and temperature in the drying process were on-line monitored. A diffusion model was used to fit the experimental data and the effective diffusion coefficient for RDX drying was determined. The results indicate that there is a falling rate period after a short warm-up period and no constant rate period is observed. The moisture content of the obtained product is less than 0.1%, satisfying the product demand. The surface static electricity and temperature distribution in the drying process is rather acceptable for the safe operation. The drying efficiency is greatly improved with the effective diffusion coefficient up to the order of 10-8. It manifests preferable drying capacity and stability in the continuous drying of RDX. Source

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