Abstract: In order to further strengthen the flow, mass transfer and mixing performance of the air lift loop reactor, a new type of annular air lift loop reactor was designed. The reactor is made of plexiglass. Outer tube height is 1 800 mm, the inner diameter of 90 mm, the length of the draft tube is 1 600 mm, the diameter of the main body is 50 mm, and the draft tube is attached with a number of groups spiral fins. when the superficial gas velocity is in the range of 0.37~2.59 cm/s, in the effect of bottom clearance, solid loading and different materials on the distributor of gas holdup in the reactor. The results show that the apparent gas velocity under the same conditions, with the increase of superficial gas velocity, rising area of local gas holdup increases; solid loading increases, rising area of local phase holdup increases; the bottom gap becomes larger, rate becomes larger with the local gas under low gas velocity; high gas velocity, gas the rate of change. At low superficial gas velocity, local gas holdup was lower than that of polymer materials with microporous local gas distributor; when the superficial gas velocity is high, the result is opposite.

Key words: Air lift, Loop reactor, Spiral fins, Gas hold-up, Draft tube

摘要： 为了进一步强化气升式环流反应器的流动、传质、混合性能,设计开发了新型的旋片环隙气升式环流反应器。该反应器以有机玻璃为材料,外管高1800mm、内径90mm、导流筒总长1600mm、主体直径50mm,其特征是导流筒上附有若干组旋片,每组旋片间距110mm。在表观气速为0.37~2.59cm/s的条件下,研究了底部间
隙、固体装载量以及不同分配器材料对该反应器内气含率的影响规律。结果表明,在相同轴向高度的条件下,随着表观气速的增大,上升区局部气含率增大;固体装载量增加,上升区局部气含率增加;底部间隙变大,低气速下局部气含率变大;在高气速下,气含率变小。在较低表观气速下,微孔分布器的局部气含率低于高分子材料的局部气含率;当表观气速较高时,结果相反。

关键词: 气升式, 环流反应器, 旋片式, 气含率, 导流筒