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CFD Characerization of Monolithic Reactors for Kinetic Studies

Soheil Soltani (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK)) ; Carolin Wang-Hansen ; Ronnie Andersson (Kompetenscentrum katalys (KCK) ; Institutionen för kemi- och bioteknik, Kemisk apparatteknik ; Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Bengt Andersson (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK))
Canadian Journal of Chemical Engineering (0008-4034). Vol. 92 (2014), 9, p. 1570-1578.
[Artikel, refereegranskad vetenskaplig]

A laboratory reactor for kinetic studies has been simulated using computational fluid dynamics (CFD). Analysis of temperature distribution within the system shows that adding an inert monolith upstream the catalyst enhances heat conduction and therefore significantly reduces radial temperature gradients. Adjustment of the heating coil plays an important role as well by allowing the gas phase to smooth out the radial temperature profile. Radiative heat transfer and its effects on both the heat losses from the catalyst and on the measurements with an unprotected thermocouple have been particularly investigated. In order to prevent both the falsifying effect of radiation and the influences from the ongoing reaction, thermocouples should be placed and shielded inside a clogged channel. An inert monolith that is placed downstream the catalyst effectively serves as a radiation shield and drastically reduces both axial and radial gradients. Studies of the dispersion in the system reveal that the FTIR's gas cell is the most important source of the overall broadening in the concentration signal, with the reactor tube being the next major source of the distortion. An algorithm based on the Tikhonov regularization method has been developed for calculating the deconvolution of the concentration data, which has refined the time-resolution in transient experiments from 20 to 2 s.

Nyckelord: computational fluid dynamic; heat transfer; radiation; dispersion; signal reconstruction



Denna post skapades 2014-09-26. Senast ändrad 2016-07-13.
CPL Pubid: 203367

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik (2005-2014)
Kompetenscentrum katalys (KCK)
Institutionen för kemi- och bioteknik, Kemisk apparatteknik (2005-2014)

Ämnesområden

Kinetik
Kemiteknik
Katalys

Chalmers infrastruktur