| Gas-liquid-solid stirred reactor can be applied in fine chemical engineering, petrochemical engineering, bio-engineering and other engineering. Because current multi-phase reactor study focuses on room temperature, there is few research on hot condition, resulting in actual design of stirred reactor depends on research result of normal temperature.Therefore, this paper mainly concentrates on the characteristics of mass transfer in three-phase and hot condition in a stirred reactor. The research in this thesis was completed in a stirred reactor where diameter of the stirred reactor is 0.3m and level of water is 0.54m with an elliptical head, in which stirred reactor, the upper and the middle are WHU, namely a wide blade hydrofoil up-pumping impeller and the bottom one is a HEDT, namely a half elliptical disk turbine. The operation condition are as followings:solid content are 0～0.12; gas-flow rate are 4m3/h～10m3/h; temperature are 25℃～80℃ speed are 8s-1～13s-1The results showed that, critical suspension speed increases with the amount of ventilation and solids content, decreasing with turbine diameter. Ventilation power number increases with solids content and temperature. Mass transfer coefficient increases with power, temperature and gas rate, and has a negative relationship with solids content. While, under condition of high solids, low speed and high speed gas, temperature effects on the mass transfer coefficient obviously. Based on these experimental results, gas power number and mass transfer coefficient empirical correlation are gained, which contains temperature, superficial gas velocity, stirring power and solids content. |
