沸腾转化催化剂床内气泡特性研究与工业反应器的模拟和优化

Study of Bubble Behavior in a Fluidized Bed Catalytic Reactor and Simulation and Optimization of an Industrial Reactor

在直径190mm的有机玻璃塔内,对填装0.27～0.79mm的以球形硅胶为载体的钒催化剂(B类粒子)流化床进行了实验研究。用直射式光纤探头连接微机采样和分析。结果表明,气泡直径和上升速度与A类粒子流化床获得的关联式基本相符。但气泡分率随床高增加而明显增加。根据实验结果,确定了B类粒子流化床反应器的模型参数。用两相平推流模型与本研究所获得的气泡参数及反应动力学方程相结合,对直径为1500mm的工业反应器进行了模拟,得到令人满意的结果,并进一步优化了工业操作条件。

The fluidized bed of vanadium catalyst of 0.27~0.79mm diameter(group B particles) supported on spherical silica gel was experimentally studied in an organic glass tower (diameter 190mm) with a vertically aligned fibre-optic probe connected to a microcomputer for sampling and analysis. The tesults indicated that the correlations obtained for bubble diameter and rising velocity were generally in agreement with those of group A particles, whereas bubble fraction increased considerably with bed height.The model parameters of the fluidized bed reactor of group B particles were determined from the experimental data. The two phase plug flow model, combined with the bubble parameters and reaction kinetic equation obtained in this study, was used to simulate an industrial reactor of 1500mm diameter. The results were satisfactory and the industrial operation conditions were further optimized.