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Problem 3 . 1 0 . AW 0 5 En fast produkt P bildas genom reaktionen mellan en gas A vars koncentration f rblir konstant

Problem 3.10. AW05 En fast produkt P bildas genom reaktionen mellan en gas A vars koncentration frblir konstant under reaktionen och ett fast B (sfriska partiklar) enligt stkiometrin g +2s ->. Reaktionen ska utfras i en ugn i vilken fasta mnen och gas kontinuerligt tillfrs och rr sig i pluggflde. Om ugnen har en hjd p2 m och en diameter p10 cm, berkna omvandlingen som uppns av det fasta mnet i operationen.
Data: Partikeldiameter: 1 cm; gasflde: 100L/h; fldeshastighet fr fasta mnen: 5 kg/h; Fast MW: 300 g/mol; massverfringskoefficient: 10-4 m/s; specifik reaktionshastighetskonstant K: 10 m/sek; effektiv diffusivitet De: 5x10-5 m2/s; temperatur: 200\deg C. NSR-modellen kan anvndas fr partiklar av konstant storlek.
NSR-modell (Ctte-storlek sfrisk partikel):
1/3 kg\cong gasfilmsdiffusionsmotstnd (seg.m-1)
R/6De\cong askdiffusionsmotstnd(seg.m-1)
1/k\cong motstnd mot kemisk reaktion (seg.m-1)

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