Bohlender, Lukas

Dercho, Stefan

Stapf, Dieter

Tavakkol, Salar

Vogt, Jonas

Zeller, Michael

Zhang, Feichi

Zirwes, Thorsten

English

KITopen

KIT – The Research University in the Helmholtz AssociationContact: Dr.-Ing. Feichi Zhang feichi.zhang@kit.eduExperiment SimulationsModel setupsMultiphysicsMultiphaseMultiscaleHydrodynamicsHeat-/mass transferReaction kineticsDigital twinsDevelopment of fluidized bed technology for plastic pyrolysis via numerical simulations Enhanced bubble formation at constant ℎ𝐵 and p Multiple arrays of rising bubbles at dR = 10 cm Inner recirculating of particles at dR = 10 cm Increase of kinetic energy & bubble frequency Proportional correlation of KS with mSFuture work: contact heat transfer, pyrolysis reactionSimulation of up-scaled fluidized bedA numerical study of a cold-mode fluidized bed reactor designed for pyrolysis of plasticsF. Zhang1,*, S. Tavakkol1, S. Dercho1, L. Bohlender1, T. Zirwes2, M. Zeller1, J. Vogt1, D. Stapf11Institute for Technical Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany2Institute for Combustion Technology, University of Stuttgart, Stuttgart, Germany31. Deutscher Flammentag27. – 28. Sept. 2023Technische Universität BerlinWhy fluidized bed- Enhanced heating- Homogeneous temperature- Continuous operation mode- Potential for scale-upComputational particle fluid dynamics (CPFD) simulations of fluidized bedhttps://www.drugplastics.com/an-introduction-to-advanced-plastic-recycling/   Operating conditionsCyl. reactor: dR = 5 cmIsothermal: T = 25 °CBed mat.: quartz sandFluidizing agent: airNumerical setupsEuler-Lagrange 4-way coupling (MPPIC)150,000 cells, ∆ = 1 mmUp to 16 mil. Lagrange parcelsObjective: HydrodynamicsParticle size distributionValidationScale-up of fluidized bed- Constant pressure drop- Same fluidization regimeTotal kinetic energy of sanddR∆𝑝∗=∆𝑝𝜌𝑠𝑔ℎℎ𝐵∗ =ℎ𝐵𝐿𝑢𝐺∗0.5 , 𝐿 =𝑚𝑆𝐴𝜌𝑆Bed height Pressure dropmS↑𝜀 [−]Scale-up Time-mean porosity3 cm     5 cm 10 cmIso-surface 𝜀 = 0.65𝑑𝑅 [cm] 3 5 10ℎ𝐵 [cm] 18.0 17.5 17.4p [mbar] 21.0 20.2 20.0𝐾𝑆 [mJ] 2.6 7.6 30.9ത𝑘𝑆 [mJ/kg] 18.8 19.6 19.3𝑓𝐵 [Hz] 2.0 3.2 3.8Gas volume fraction𝐾𝑆 =12෍𝑖=1𝑁𝑝𝑚𝑝,𝑖𝑢𝑝,𝑖2𝑑𝑅 3 cm 5 cm 10 cm𝑚𝑆 140 g 390 g 1600 g𝑢𝐺 21 cm/s 21 cm/s 21 cm/s𝑁𝑃 2.9 mil. 8.0 mil. 32.0 mil.

A numerical study of a cold-mode fluidized bed reactor designed for pyrolysis of plastics

https://publikationen.bibliothek.kit.edu/1000165897/151901907

A numerical study of a cold-mode fluidized bed reactor designed for pyrolysis of plastics

Abstract

Similar works

Full text

Available Versions

KITopen