CFD modeling of municipal solid waste gasification in a fixed-bed plasma gasification melting reactor
2011 (English)In: Air Waste Manage. Assoc. - Int. Conf. Therm. Treat. Technol. Hazard. Waste Combustors, 2011, 252-278 p.Conference paper (Refereed)
A steady CFD model is developed to simulate the gasification of municipal solid waste (MSW) in a moving-bed Plasma Gasification Melting (PGM) reactor. In this model, the Eulerian-Eulerian multiphase model is conducted, and the solid phase is treated as a plastic fluid. The conservation equations of both gas and solid phases are solved respectively. The momentum conservation equations of the solid phase are simplified by disregarding the interphase forces between gas and solid. Both heterogeneous reactions and homogeneous reactions are defined in this model to express the detailed gasification chemistry inside the reactor. A two-step pyrolysis model was used in this work, and the pyrolysis mechanisms of cellulosic and plastic fractions are considered separately. The predicted results of a base case are compared with the measured data of the trial reactor. The temperature distribution inside the PGM reactor is introduced. Based on the variation of temperature, the whole reaction shaft was divided into five layers. The 2D effect of the reactor is also discussed. The influence of two dimensionless parameters: the equivalence ratio (ER) and dimensionless plasma energy ratio (DPER) are introduced and discussed. With the variation of ER, two typical temperature distributions can be found for PGM reactor. The turning point of these two distributions stands in the ER range 0.120-0.133. This turning point is the optimal operation condition of PGM air gasification. It is also found that when the energy request for gasification is satisfied, further increment of DPER value does not significantly influence the characters of PGM process.
Place, publisher, year, edition, pages
2011. 252-278 p.
, Air and Waste Management Association - International Conference on Thermal Treatment Technologies and Hazardous Waste Combustors 2011
2D effect, Air gasification, CFD modeling, CFD models, Conservation equations, Dimensionless parameters, Equivalence ratios, Eulerian-Eulerian multiphase model, Fixed-bed, Heterogeneous reactions, Homogeneous reaction, Measured data, Momentum conservation equations, Optimal operation conditions, Plasma energy, Plasma gasification, Plastic fluids, Pyrolysis mechanism, Solid phasis, Solid-phase, Turning points, Two-step pyrolysis, Combustion, Combustors, Gasification, Hazardous materials, Heat treatment, Melting, Pyrolysis, Temperature distribution, Waste treatment, Municipal solid waste
IdentifiersURN: urn:nbn:se:kth:diva-151161ScopusID: 2-s2.0-80051682876ISBN: 9781617829536OAI: oai:DiVA.org:kth-151161DiVA: diva2:747727
International Conference on Thermal Treatment Technologies and Hazardous Waste Combustors 2011, 10-13 May 2011, Jacksonville, FL, USA
QC 201409172014-09-172014-09-152014-09-17Bibliographically approved