Modelling of Melting in Packed Media due to Forced Air Convection with Higher Temperature using Euler-Euler-Lagrangian approach

Soon, Genevieve; Zhang, Hui; Law, Adrian Wing‐Keung; Yang, Chun

doi:10.1016/j.ijheatmasstransfer.2022.123055

Cited by 3 publications

(2 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The general form of the momentum exchange coefficient, K pq , is calculated based on either the Wen and Yu model [40] (α q > 0.8) or the Ergun equation [41] (α q ≤ 0.8), where phase q is the less dense phase. From our previous study [32], this drag model is capable of representing the resistance to the motion of the molten slag through the packed bed. However, for smaller MSW and solid slag particles, other forces such as pressure gradient or lift forces might also be needed, as they can be carried out of the domain via the gas.…”

Section: Solution Procedures and Inter-phase Coupling Of Mass Momentu...mentioning

confidence: 99%

“…Earlier, a three-phase computational modelling tool called CD-MELT was developed to simulate both iso-thermal and non-isothermal melting [31,32], and the numerical predictions have been shown to be satisfactory in two earlier studies for packed beds under convective flows. The CD-MELT model is based on the CFD-DEM method, which represents the solid phase via discrete particles, and the fluid (gas and liquid) phases as separate continuums.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computational Modelling on Gasification Processes of Municipal Solid Wastes Including Molten Slag

Soon

Zhang

Law

et al. 2023

Waste

Self Cite

View full text Add to dashboard Cite

The formulation of the CFD-DEM model, CD-MELT, is established in this study to include three-phase non-isothermal processes with simultaneous combustion and melting for gasification simulations. To demonstrate the model capability, CD-MELT is used to assess the need for slag recycling for the non-isothermal melting of municipal solid wastes (MSW) in a prototype waste-to-energy research facility. The simulation encompasses the full fixed-bed slagging gasification process, including chemical reactions and melting of MSW and slag. In order to assess the need for slag recycling, comparisons are made for the two cases of with and without, in terms of the slag mass, liquid slag volume fraction, exit gas composition, and temperature distribution in the gasifier. The prediction results enable the tracking of liquid molten slag as it permeates through the solids-packed bed for the first time in the literature as far as we are aware, which is crucial to address design considerations such as distribution of bed temperature and optimal location for slag-tap holes at the bottom, as well as potential slag clogging within the porous media. The model also predicts an uneven and intermittent slag permeation through the packed bed without the recycling, and provides a plausible explanation for the operators’ experience of why slag recycling is important for process stability. Finally, the predicted slag outlet temperature using the proposed CFD approach also agrees well with the measurement data published in an earlier case study for the same facility.

show abstract

Section: Solution Procedures and Inter-phase Coupling Of Mass Momentu...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%