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Kainakhone Pathoumthong. Scaling up of bubbling fluidized bed reactors for chemical production : a case study of dimethyl ether production from syngas. Master's Degree(Chemical Engineering). Kasetsart University. Office of the University Library. : Kasetsart University, 2022.
Scaling up of bubbling fluidized bed reactors for chemical production : a case study of dimethyl ether production from syngas
Name: Kainakhone Pathoumthong
Classification :.LCCS: TP156.F65
LCSH:
Fluidized reactors
LCSH:
Chemical reactors
LCSH:
Synthesis gas
LCSH:
Methyl ether
Abstract:
The flow pattern in a bubbling fluidized bed is complex leading to difficulty in modelling. Thus, scaling this type of reactor to commercial size is also complex and challenging. Mass transfer limitations are present in a large-scale bubbling fluidized bed reactor due to the formation of large bubbles. A two-phase model was developed for scaling up bubbling fluidized bed reactors for dimethyl ether production. This work demonstrates an approach for scaling up a bubbling fluidized bed reactor from a laboratory scale to industrial scale using the two-phase model combined with the mass transfer coefficient correlation to achieve similar reactor performance after scaling-up. Three criteria were used in scaling up: hydrodynamic similarity, constant residence time with similar bubble hydrodynamic behavior, and performance similarity. The hydrodynamic similarity criterion was shown to be inadequate due to low mass transfer and residence time in a large-scale. The low mass transfer is caused by too large bubble size leading to lower DME production yield in the large scale compared to that in the laboratory scale. The findings indicate that mass transfer has a significant effect on reactor performance, especially in large scales. The mass transfer in the reactor depends on bubble size. The criteria of similarities in performance and residence time provide the same dimethyl ether yield in all scales. Using the criterion of performance similarity, the bubble size should be increased accordingly in order to achieve the same DME production yield across all reactor scales. The proper bubble size is obtained from the two-phase model. The bubble size, the key parameter in adjusting mass transfer rate in the reactor was found smaller than that using the criterion of hydrodynamic similarity, leading to a higher DME production yield. Identical residence time should be considered in addition to same mass transfer behavior when scaling up bubbling fluidized bed reactors. The developed two-phase models, combined with the mass transfer parameters, are useful for analysis of laboratory and industrial-scale reactors, and provide information on scaling-up.
Kasetsart University. Office of the University Library
Address:
Bangkok
Email:
tdckulib@ku.ac.th
Name: Sunun Limtrakul
Role:
Thesis Advisor
Created:
2022
Modified:
2025-07-20
Issued:
2025-07-20
วิทยานิพนธ์/Thesis
application/pdf
URL: https://www.lib.ku.ac.th/KUthesis/2565/kainakhone-pat-all.pdf
CallNumber:
TP156.F65 .K35
eng
DegreeName: Master of Engineering
Level: Master's Degree
Descipline: Chemical Engineering
Grantor: Kasetsart University
©copyrights Kasetsart University
RightsAccess:
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0.023329 วินาที
Kainakhone Pathoumthong
| Title | Contributor | Type |
|---|---|---|
| Scaling up of bubbling fluidized bed reactors for chemical production : a case study of dimethyl ether production from syngas
มหาวิทยาลัยเกษตรศาสตร์ Kainakhone Pathoumthong | Sunun Limtrakul | วิทยานิพนธ์/Thesis |
Sunun Limtrakul