Modeling On-Grate MSW Incineration with Experimental Validation in a Batch Incinerator

Abstract

This Article presents a 2-D steady-state model developed for simulating on-grate municipal solid waste incineration, termed GARBED-ss. Gas-solid reactions, gas flow through the porous waste particle bed, conductive, convective, and radiative heat transfer, drying and pyrolysis of the feed, the emission of volatile species, combustion of the pyrolysis gases, the formation and oxidation of char and its gasification by water vapor and carbon dioxide, and the consequent reduction of the bed volume are described in the bed model. The kinetics of the pyrolysis of cellulosic and noncellulosic materials were experimentally derived from experimental measurements. The simulation results provide a deep insight into the various phenomena involved in incineration, for example, the complete consumption of oxygen in a large zone of the bed and a consequent char-gasification zone. The model was successfully validated against experimental measurements in a laboratory batch reactor, using an adapted sister version in a transient regime.

Modeling Kinetics of Cd, Pb, and Zn Vaporization during Municipal Solid Waste Bed Incineration

“…More details are given in the Supporting Information of our previous work. 10 The highest temperatures were found above the pyrolysis front (approximately 1100°C, z ) 2-5 m), in the narrow zone where the pyrolysis gases burn and where char, the carbonaceous residue of the pyrolysis, is formed, and above the front of combustion of char (the hottest zone, approximately 1250°C, z ) 5-7 m).…”

A study on the dynamic combustion behavior of a biomass fuel bed

“…Yang et al [5] developed a 2-D model to simulate MSW incineration on a traveling bed and the results showed that the effect of channeling can increase the concentrations of hydrocarbons in flue gas due to poor mixing. Ashtana et al [6] has developed a static model to describe grate combustion in an MSW boiler. The modeling work revealed the presence of two combustion fronts above which char reduction reactions occur.…”

Coupling scales for modelling heavy metal vaporization from municipal solid waste incineration in a fluid bed by CFD

“…Zhang et al, 2008;Yu et al, 2012Yu et al, , 2013 and theoretically -by thermodynamic modelling - (Zhou et al, 2002;Sørum et al, 2003;Ménard et al, 2006;Mazza et al, 2009Mazza et al, , 2010), the heavy metal release from different kinds of particles. The metal speciation can be predicted from the waste and the gas compositions, but the transient system evolution cannot be predicted by thermodynamics calculations Asthana et al, 2010b). Thus, the HM evolution must be investigated by kinetic studies in burning conditions.…”