浆态床鼓泡反应器中气含率的分布

Distribution of gas holdup in slurry bubble column reactor

为了解浆态床鼓泡反应器中气含率的分布规律,在浆态床鼓泡反应器冷模试验装置中,以空气-液体石蜡-氧化铝微球为试验介质对装置内部的气含率进行研究。利用压差法研究了表观气速、浆液固含量等操作条件对反应器床层总体气含率的影响,利用光纤探针法研究了浆态床反应器不同操作条件对局部气含率的影响,总结了反应器内部气含率的分布规律,并由此对工业浆态床鼓泡反应器的设计进行了研究。结果表明:浆态床反应器的总体气含率随表观气速的增大而增大,固体细颗粒的加入能适当降低总体气含率;在反应器底部,分布器对气体的均布作用明显,但表观气速的增大能够弱化分布器的作用;在反应器的中上部气含率不受分布器的影响,沿反应器径向呈现"中间高,边缘低"的分布趋势;在工业费托浆态床中,表观气速不宜低于0.12 m/s,内过滤系统适宜设置于反应器中上部靠近器壁的位置。

In order to study distribution law of gas holdup in slurry bubble column reactor, the gas holdup in slurry bubble column reactor was studied under cold-state experiment with the aid of an air-liquid paraffin-alumina microspheres 3-phase system. The effects of super- ficial gas velocity and solid concentration on total gas holdup were investigated using differential pressure transmitter. The distribution of lo- cal gas holdup under different operating condition was also systematically elucidated by means of an optical fiber probe. Based on these ex- perimental results, the design of an industrial slurry bubble column reactor was also proposed. Results show that total gas holdup increases with increasing of superficial gas velocity, while the addition of solid fine particles slightly decreases the total gas holdup. In the bottom area of the reactor,a significant effect of gas sparger on gas holdup distribution presents. Such effects partly decrease with the increasing of su- perficial gas velocity. In the middle and upper area of the reactor, the gas holdup shows higher in the middle, while lower at the edge distri- bution status along the radial direction, which means there is no obvious effect from the gas sparger in this area. For an industrial Fischer- Tropsch synthesis reactor,the filtration system should be better located at the area near the middle/upper reactor wall, with the operating superficial velocity higher than 0.12 m/s.