Gas holdup and bubble size behavior in a large-scale slurry bubble column reactor operating with an organic liquid under elevated pressures and temperatures

详细信息	查看全文 | 推荐本文 |

• 作者：Arsam Behkish ; Romain Lemoine ; Laurent Sehabiague ; Rachid Oukaci ; Badie I. Morsi
• 关键词：Slurry bubble column reactor ; Gas holdup ; Bubble size distribution ; Sauter-mean bubble diameter ; Dynamic gas disengagement ; Fischer– ; Tropsch synthesis
• 刊名：Chemical Engineering Journal
• 出版年：2007
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：1 April 2007
• 卷：128
• 期：2-3
• 页码：69-84
• 文件大小：2601 K

摘要

The holdups of small and large gas bubbles, bubble size distribution and the Sauter-mean bubble diameter were measured for N₂ and He in isoparaffinic organic liquid mixture (Isopar-M) in the absence and presence of Alumina powder under various pressures (0.67–3 MPa), temperatures (300–473 K), superficial gas velocities (0.07–0.39 m/s), and solid concentrations (0–20 vol.%) in a large-scale bubble column and slurry bubble column reactor (SBCR) (0.29 m diameter, 3 m height). The gas holdup was measured using the manometric method and the bubble size distribution, and Sauter-mean bubble diameter were obtained using the dynamic gas disengagement (DGD) technique and the photographic method.

The experimental data showed that the total gas holdup increased with pressure and superficial gas velocity due to the increase of gas momentum which shifted the bubble size distribution towards smaller gas bubbles. The total gas holdup was also found to increase with temperature due to the decrease of liquid viscosity and surface tension. Increasing the solid concentration, on the other hand, resulted in a significant decrease of the total gas holdup and significantly increased the Sauter-mean bubble diameter. The online monitoring of the swarm using the high-speed camera showed a decrease of the froth stability in the reactor with increasing solid concentration and temperature which were responsible for the decrease of the total gas holdup.