摘要：Airlift reactors are frequently preferred in biochemical engineering, and related investigations are almost performed using bench-scale reactors. However, in industrial-scale reactors, multiphase fluid usually exhibits unique mixing and transfer behaviors. Therefore, we studied the flow regimes characteristics in an industrial-scale center-rising airlift reactor (CRALR) with a diameter of 1.2 m. The results show that the available jet hole area of the gas distributor gradually increases along with the superficial gas velocity in the plateau range of the total pressure drop. Since the rise in initial liquid height enlarges the available jet hole area, the flow regime can be transformed from a pure heterogeneous regime to other regimes. Meanwhile, the total gas holdup plunges within the transition regime range, which can be interpreted by the gas-liquid oscillations in the gas distributor with a large free gas volume. When the oscillations cannot maintain the small bubble ratio, the rapid transition from a homogeneous regime to heterogeneous regime is affected. Compared with previous results, the bubble stream rotates in advance in the homogeneous regime of the industrial-scale CRALR. The rotational structure helps to reduce the flow resistance and improves the radial bubble distribution. Furthermore, the total gas holdup curves under various operating conditions converge into one curve at which a limit, determined by equipment parameters, is ultimately reached in the course of increasing the superficial gas velocity. It turns out that the fluids have similar hydrodynamic behaviors in flow fields of different scales when the limit is reached.

关键字：Airlift reactor; Flow regimes; Scale-up effect; Pressure drop plateau; Gas-liquid oscillations; Preformed rotational structure

ISSN号：1385-8947

卷、期、页：卷: 430子辑: 4

发表日期：2022-02-15

影响因子：13.272900

期刊分区（SCI为中科院分区）：一区

收录情况：SCIE（科学引文索引网络版）

发表期刊名称：CHEMICAL ENGINEERING JOURNAL

通讯作者：钟帆,邢中彬,麻羽嘉,尚伟康,梁明友,梅馨元

第一作者：曹睿,刘艳升

论文类型：期刊论文

论文概要：钟帆,邢中彬,曹睿,刘艳升,麻羽嘉,尚伟康,梁明友,梅馨元，Flow regimes characteristics of industrial-scale center-rising airlift reactor，CHEMICAL ENGINEERING JOURNAL，2022，卷: 430子辑: 4

论文题目：Flow regimes characteristics of industrial-scale center-rising airlift reactor