Liquid velocity in a high-solids-loading three-phase external-loop airlift reactor
Само за регистроване кориснике
2012
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
BACKGROUND: Airlift reactors are of interest for many different processes, especially for three-phase systems. In this study the behavior of a high-loading three-phase external-loop airlift reactor was examined. In particular, the effect of parameters such as airflow rate (riser superficial gas velocities between 0.003 and 0.017 m s-1), solids loading (up to 50%, v/v) on liquid circulation velocity in the air-water-alginate beads system as a crucial hydrodynamic parameter was studied. RESULTS: It was observed that increase of the airflow rate resulted in increase of the liquid velocity in the system. The same result but less pronounced was observed by introducing small amounts of solid particles up to 7.5% v/v. However, further introduction of solids caused decrease of the liquid velocity. Laminar regime for the liquid circulation was observed for low gas velocities. Minimum gas velocities for recirculation initiation in the reactor were determined for all solid loadings and linear dep...endence on the solid content was found. Gas holdups for the three-phase system were larger than for the two-phase system in all experiments. A simple model for predicting the liquid circulation velocity in the three-phase system with high solid loading of low-density particles was developed. This model is based on the viscosity of integrated medium (solid + liquid) which is a new aspect to analyze this phenomenon. CONCLUSIONS: The developed model shows very good agreement with the experimental results for all solid loadings. It also includes the influence of reactor geometry on the liquid circulation velocity thus enabling optimization.
Кључне речи:
bioreactors / multiphase reactors / air-lift / hydrodynamics / liquid velocity correlation / alginate beadsИзвор:
Journal of Chemical Technology and Biotechnology, 2012, 87, 11, 1529-1540Издавач:
- Wiley-Blackwell, Hoboken
DOI: 10.1002/jctb.3783
ISSN: 0268-2575
WoS: 000310251200003
Scopus: 2-s2.0-84867651717
Институција/група
Tehnološko-metalurški fakultetTY - JOUR AU - Milivojević, Milan AU - Pavlou, Stavros AU - Bugarski, Branko PY - 2012 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2182 AB - BACKGROUND: Airlift reactors are of interest for many different processes, especially for three-phase systems. In this study the behavior of a high-loading three-phase external-loop airlift reactor was examined. In particular, the effect of parameters such as airflow rate (riser superficial gas velocities between 0.003 and 0.017 m s-1), solids loading (up to 50%, v/v) on liquid circulation velocity in the air-water-alginate beads system as a crucial hydrodynamic parameter was studied. RESULTS: It was observed that increase of the airflow rate resulted in increase of the liquid velocity in the system. The same result but less pronounced was observed by introducing small amounts of solid particles up to 7.5% v/v. However, further introduction of solids caused decrease of the liquid velocity. Laminar regime for the liquid circulation was observed for low gas velocities. Minimum gas velocities for recirculation initiation in the reactor were determined for all solid loadings and linear dependence on the solid content was found. Gas holdups for the three-phase system were larger than for the two-phase system in all experiments. A simple model for predicting the liquid circulation velocity in the three-phase system with high solid loading of low-density particles was developed. This model is based on the viscosity of integrated medium (solid + liquid) which is a new aspect to analyze this phenomenon. CONCLUSIONS: The developed model shows very good agreement with the experimental results for all solid loadings. It also includes the influence of reactor geometry on the liquid circulation velocity thus enabling optimization. PB - Wiley-Blackwell, Hoboken T2 - Journal of Chemical Technology and Biotechnology T1 - Liquid velocity in a high-solids-loading three-phase external-loop airlift reactor EP - 1540 IS - 11 SP - 1529 VL - 87 DO - 10.1002/jctb.3783 ER -
@article{ author = "Milivojević, Milan and Pavlou, Stavros and Bugarski, Branko", year = "2012", abstract = "BACKGROUND: Airlift reactors are of interest for many different processes, especially for three-phase systems. In this study the behavior of a high-loading three-phase external-loop airlift reactor was examined. In particular, the effect of parameters such as airflow rate (riser superficial gas velocities between 0.003 and 0.017 m s-1), solids loading (up to 50%, v/v) on liquid circulation velocity in the air-water-alginate beads system as a crucial hydrodynamic parameter was studied. RESULTS: It was observed that increase of the airflow rate resulted in increase of the liquid velocity in the system. The same result but less pronounced was observed by introducing small amounts of solid particles up to 7.5% v/v. However, further introduction of solids caused decrease of the liquid velocity. Laminar regime for the liquid circulation was observed for low gas velocities. Minimum gas velocities for recirculation initiation in the reactor were determined for all solid loadings and linear dependence on the solid content was found. Gas holdups for the three-phase system were larger than for the two-phase system in all experiments. A simple model for predicting the liquid circulation velocity in the three-phase system with high solid loading of low-density particles was developed. This model is based on the viscosity of integrated medium (solid + liquid) which is a new aspect to analyze this phenomenon. CONCLUSIONS: The developed model shows very good agreement with the experimental results for all solid loadings. It also includes the influence of reactor geometry on the liquid circulation velocity thus enabling optimization.", publisher = "Wiley-Blackwell, Hoboken", journal = "Journal of Chemical Technology and Biotechnology", title = "Liquid velocity in a high-solids-loading three-phase external-loop airlift reactor", pages = "1540-1529", number = "11", volume = "87", doi = "10.1002/jctb.3783" }
Milivojević, M., Pavlou, S.,& Bugarski, B.. (2012). Liquid velocity in a high-solids-loading three-phase external-loop airlift reactor. in Journal of Chemical Technology and Biotechnology Wiley-Blackwell, Hoboken., 87(11), 1529-1540. https://doi.org/10.1002/jctb.3783
Milivojević M, Pavlou S, Bugarski B. Liquid velocity in a high-solids-loading three-phase external-loop airlift reactor. in Journal of Chemical Technology and Biotechnology. 2012;87(11):1529-1540. doi:10.1002/jctb.3783 .
Milivojević, Milan, Pavlou, Stavros, Bugarski, Branko, "Liquid velocity in a high-solids-loading three-phase external-loop airlift reactor" in Journal of Chemical Technology and Biotechnology, 87, no. 11 (2012):1529-1540, https://doi.org/10.1002/jctb.3783 . .