Sažetak
U radu je izložen model određivanja sastava heterogeneravnotežne mešavine pri odvijanju reakcije C + 2×H2 = CH4.
Razmatra se uticaj reakcione tem per a ture na sastav ravnotežne
mešavine. Već pri ambijentalnoj temperaturi udeo metana u
ravnotežnoj mešavini je 100%. Ravnoteža reakcije je pomerena
skroz u desno (Kp = 6048,76 Pa‡1 o1). Stepen konverzije reaktanata
(C i H2) pri ambijentalnoj temperaturi je tako|e 100%. Sa
porastom temperature stepen konverzije ugqenika i vodonika
opada a pri 1100 K stepen konverzije praktično iznosi 0%.
Prikazani model omogućava određivanje uslova pri kome u
ravnotežnoj mešavini prestaje da postoji čvrsta faza (xC = 0).
Prikazan je nov način proračuna sastava homogene (gasovite)
mešavine, jednačine (30) do (37), koji je identičan sa rezultatima
klasičnog proračuna samo gasovite faze, jednačine (24) do (29).
Reference
Melgar, A., et al., Thermochemical Equilibrium Modelling of Gasifying Process, Energy Conversion Management, 48 (2007), 1, pp. 59-67
Huang, H. J., Ramaswamy, S., Modeling Biomass Gasification Using Thermodynamic Equilibrium Approach, Applied Biochemistry and Biotechnology, 154 (2009), 1-3, pp. 14-25
Venkata, R. M., et al., Performance Prediction and Validation of Equilibrium Modeling for Gasification of Ca shew Nut Shell Char, Brazilian Journal of Chemical Engineering, 25 (2008), 3, pp. 585-601
Jarungthammachote, S., Dutta, A., Thermodynamic Equilibrium Model and Second Law Analysis of a Downdraft Waste Gasifier, Energy, 32 (2007), 9, pp. 1660-1669
Zainal, Z. A., et al., Prediction of Performance of a Downdraft Gasifier Using Equilibrium Modeling for Different Biomass Materials, Energy Conversion and Management, 42 (2001), 12, pp. 1499-1515
Haryanto, A., et al., Upgrading of Syngas Derived from Bio mass Gasification, A Thermodynamic Analysis, Biomass and Bioenergy, 33 (2009), 5, pp. 882-889
Kozaczka, J., Procesy Zgazowania, Inzynierskie Metody Obliezen, Gasification Processes, Engineering Calculation Methods, Krakow: Wydaw, AGH, 1994
Prins, M. J., Ptasinski, K. J., Janssen, F. J. J., Thermodynamics of Gas-Char Reactions: First and Second Law Analysis, Chemical Engineering Science, 58, Issues 3-6, (2003), pp. 1003-1011
Li, X., et al., Equilibrium Modeling of Gasification: a Free Energy Minimization Approach and Its Application to Circulating Fluidized Bed Coal Gasifier, Fuel, 80 (2001), 2, pp. 195-207
Djurić S., Kuburović, M., Jovović, A., The Model for Theoretical Determination of Composition of a Heterogenous Equilibrium Mixture in the Course of Chemical Reactions C + H2O = CO + H2 and C + 2H2 = CH4, FME Transactions, 30 (2002), 2, pp. 47-52
Gumz, W., Kurzes Handbuch der Brennstoff und Feuerungstechnik, Springer-Verlag, Berlin, 1962