Two-fluid simulation of moving grate waste incinerator: Comparison of 2D and 3D bed models

CFD-based simulation models of large-scale moving grate combustor for biomass and municipal solid waste are not well established. Although a 3D transient two-fluid model provides dynamic coupling between the fuel bed and the freeboard, simulation of a whole incinerator is extremely computational int...

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Veröffentlicht in:Energy (Oxford) Jg. 216; S. 119257
Hauptverfasser: Xia, Zihong, Long, Jisheng, Yan, Shuai, Bai, Li, Du, Hailiang, Chen, Caixia
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Oxford Elsevier Ltd 01.02.2021
Elsevier BV
Schlagworte:
2D and 3D bed models
biomass
Biomass burning
Combustion
Combustion chambers
Computational efficiency
Computational fluid dynamics
Computer applications
Coupling
Direct bed-furnace coupling
energy
Fluid flow
Freeboard
fuel bed
Fuels
furnaces
geometry
heat
Incineration
Incinerators
Industrial applications
Moving grate combustor
Municipal solid waste
Municipal waste management
particle size
Simulation
Solid waste management
Steady and transient simulations
Three dimensional models
throat
Two dimensional models
Two fluid models
Two-fluid simulation
Direct bed-furnace coupling
2D and 3D bed models
Moving grate combustor
Steady and transient simulations
Two-fluid simulation
ISSN:0360-5442, 1873-6785
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Zusammenfassung:CFD-based simulation models of large-scale moving grate combustor for biomass and municipal solid waste are not well established. Although a 3D transient two-fluid model provides dynamic coupling between the fuel bed and the freeboard, simulation of a whole incinerator is extremely computational intensive and difficult for industrial applications. In this paper, an efficient computational method is proposed where a 2D bed model is combined with a 3D steady furnace model. In the new approach, the bed model includes a transient two-fluid simulation using realistic grate geometry cut by the incinerator throat, which includes a dynamic coupling of heat and mass transfers between the fuel bed and the lower combustion chamber. The simulated bedtop profiles are then used as inlet conditions to run a 3D steady simulation of turbulent gas combustion for the whole furnace. The simulation results are validated with our previous 3D transient full-incinerator results (Xia et al., 2020) [1] and on-site measurement data. In addition, effects of particle size, waste throughput, and residence time on the bed incineration performance are investigated. Overall, the current computational method highly promotes the efficiency of modelling industrial moving grate combustors. •An efficient computational method for moving grate incinerators is proposed.•An interactive two-way coupling bed model is realized.•Results are validated by 3D full-incinerator results and on-site measurement data.•Effects of operating parameters on the bed incineration are investigated.•Relative importance to incineration: particle size > residence time > throughout.
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ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2020.119257