Oil shale reactor: process analysis and design by CFD

[Display omitted] •Oil shale reactor was modeled by using a reactive moving bed approach.•Three models for the interphase thermal exchange were evaluated.•Drying, heating, reaction and cooling zones were identified.•Hot gas injection temperature and flow rate have the greatest effect on the process....

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Bibliographic Details
Published in:Chemical engineering research & design 2019-12, Vol.152, p.180-192
Main Authors: Stahnke, C., Silva, M.K., Rosa, L.M., Noriler, D., Martignoni, W.P., Bastos, J.C.S.C, Meier, H.F.
Format: Article
Language:English
Subjects:
Chemical reactions
Computational fluid dynamics
Design analysis
Energy consumption
Fluid dynamics
Heat transfer
Mass transfer
Mathematical models
Moving beds
Multiphase and reactive flows
Multiphase flow
Oil shale
Oil shale reactor
Organic chemistry
Organic matter
Parameter sensitivity
Porous media
Porous moving bed
Process analysis
Pyrolysis
Reaction mechanisms
Reactors
Response surface methodology
Scaling-Up effects
Sensitivity analysis
Shale pyrolysis
Three dimensional models
Turbulent flow
Viability
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Summary:[Display omitted] •Oil shale reactor was modeled by using a reactive moving bed approach.•Three models for the interphase thermal exchange were evaluated.•Drying, heating, reaction and cooling zones were identified.•Hot gas injection temperature and flow rate have the greatest effect on the process.•Scale effects were observed for pilot and industrial-scale reactors. The oil shale pyrolysis process using a moving bed reactor was investigated with a three-dimensional mathematical model considering turbulent and multiphase flow in a porous moving bed, under non-isothermal and reactive conditions. Mass, heat and momentum balances involving chemical reactions of interest were formulated following a Eulerian approach to represent the process behavior. In the present approach, the shale bed was modeled as a porous medium and the advection due to its movement was implemented. Process analysis via CFD enabled the location of the drying, heating, reacting and cooling zones to be identified in the pilot-scale reactor. Moreover, it was possible to analyze in detail the conversion of organic matter to products, according to the reaction mechanism. The effects of heat and mass transfer inside the reactor were assessed through parametric sensitivity analysis, considering five parameters and five response values. The results were analyzed using the response surface method, which established the influence of each variable. The best values obtained for the thermal-energy consumption and the mechanical-energy consumption were 126.16 and 12.39kJ/kg, respectively. Considering the best operational conditions, scaling-up effects were also evaluated to shed light on the technical viability as well to carry out the design and analysis of the process.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2019.09.043