流化床内氧化钛铁矿过程的非等温行为

NONISOTHERMAL BEHAVIOR OF THE OXIDATION OF ILMENITE IN FLUIDIZED BED

本文以流化床反应器的两相模型理论为基础．建立了描述在流化床内氧化钛铁矿反应的非等温数学模型．根据由实验测定的氧化反应表观速率常数和反应热效应，以及用经验公式估算的其它参数值，采用Ｒｕｎｇｅ－Ｋｕｔｔａ法求解该动力学模型．计算结果表明，床层内温度的计算值与实测值基本吻合．流化床内最高温度值随人炉气体（Ｏ２－Ｎ２）中氧气浓度线性增大，流化床的散热主要是通过床展与器壁间的传热实现的．

A nonisothermal kinetic model describing the oxidation of ilmenite in the fluidized bed has been developed on the basis of the two-phase theory of a fluidized-bed reactor, and it has then been solved numerically by means of the Runge-Kutta Method with parameters which were measured experimentally or estimated with empirical correlations. The calculation results reveal that the temperature inside the fluidized bed fit generally with that of the mathematical simulation, and the maximum temperature of the bed is increased linearly with the concentration of oxygen fed into the furnace. It has further been found that heat dissipation of the bed occur mainly at the wall.