三维上流式反应器床层流动和返混特性

采用内径为280 mm的上流式反应器，以空气模拟气相、甘油和水混合溶液模拟渣油。用3种不同粒径的氧化铝球形工业催化剂颗粒为填充颗粒，考察了不同模拟物系的颗粒粒径、颗粒密度、液相黏度、不同床层的高径比和不同操作条件对上流式反应器内床层压降及其波动、床层轴向返混的影响规律。得到模拟工业运行物系和操作条件的上流式反应器床层总压降关联式，相对误差在12%以内。床层总压降均随床层高径比、颗粒密度和液相黏度增加而增大，但随颗粒粒径的增大而减小，床层压降波动随表观气速增加而增大。填充颗粒粒径越小、颗粒密度越小、高径比越大，床层内轴向返混越严重；床层内压降和轴向返混均随表观气速的增加而增大。

Flow and back-mixing characteristics in three dimensional up-flow reactor

Using an up-flow reactor with inner diameter of 280 mm, the industrial gas phase with air and the residual oil with the mixture of glycerol and water are simulated. The effects of particle size, particle density, liquid viscosity and the ratio of bed height to diameter under different operating conditions on the total bed pressure drop and its fluctuation, and the axial back-mixing were investigated in an up-flow reactor packed by alumina spherical catalyst particles. A correlation of pressure drop is obtained with the relative error below 12% which is suitable for gas-liquid-solid systems simulated industrial operating system and operating conditions in an up-flow reactor. The total pressure drop decreases with the increase of particle size, the ratio of height to diameter, particle density and liquid viscosity. The pressure fluctuation becomes stronger when the superficial gas velocity increases. The axial back-mixing in the reactor packed by smaller size and smaller density particles with the larger ratio of height to diameter is more serious. Both bed pressure drop and axial back-mixing increase with the increasing superficial gas velocity.