气-固环流反应器内窜气现象的研究

Study on Gas Bypass in a Gas-Solid Airlift Loop Reactor

为研究气固环流反应器内普遍存在的窜气现象对反应器的性能的影响,在一套外环流筒内径(?)286 mm,高2 900 mm,内筒外径(?)220 mm,高1 200 mm的空气-流化催化裂化颗粒的气固环流反应器冷态实验装置内测量了反应器内的窜气行为。结果发现,环隙区的窜气量和导流筒区的窜气量均随着环隙区和导流筒区操作气速的增加而增加,环隙区的窜气分率随着导流筒区操作气速(u_(g,D))的增大而增大,随着环隙区操作气速(u_(g,A))的增大而减小;导流筒区的窜气分率(F_(DA))随着u_(g,D)的增大而减小,随着u_(g,A)的增大而增大。通过非线性回归得到了导流筒区和环隙区的窜气分率与操作气速的关系。

Gas bypassing has a significant influence on the performance of an airlift loop reactor. Gas bypassing behaviors were investigated in an air-fluidized catalytic cracking （FCC） solid loop reactor with the column of 0286 mmx2 900 mm and the draft tube of Ф220 minx I 200 ram. Results showed that flow rates of gas bypassing in the draft tube and the annulus increase with increasing the superficial gas velocity in both regions. Fraction of gas bypassing from the annulus region to the draft tube region increases with increase of superficial gas velocity in the draft tube region （ug,D）, but decreases as superficial gas velocity in the annulus （Ug,A） increases. While the fraction of gas bypassing from the draft robe region to the annulus region decreases with increasing Ug, D, but decrease when Ug, a increases. A correlation was proposed to predict the fraction of gas bypassing between the draft tube and annulus regions.