Influence of bag filter ash to spectral thermal radiation in fluidized bed combustors Co-Fired with biomass

Date

2021-09-01

Author

Yaşar, Mehmet Soner
Selçuk, Nevin
Külah, Görkem

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

419
views

0
downloads

Influence of fine particles collected in bag filter on spectral thermal radiation is investigated in the freeboard of a 0.3 MWt atmospheric bubbling fluidized bed combustion test rig where lignite, lignite/olive residue, and lignite/hazelnut shell blends are fired with limestone addition. For this purpose, a 3-D radiation code based on method of lines solution of discrete ordinates method coupled with banded one gas spectral line-based weighted sum of gray gases for spectral gas properties, Mie theory for spectral particle properties and spectral wall properties is utilized. The radiation code is implemented by considering first presence of combustion gases only, then combustion gases with bag filter particles (less than 14 μm) only, and then combustion gases with coarse cyclone and fine bag filter particles. The results of this study reveal that particle absorption and scattering are dominated by coarse cyclone particles during combustion of lignite only while they are dominated by bag filter particles during co-combustion of biomass and lignite owing to higher amount of fine particles originated from biomass combustion. During co-firing, contribution of cyclone particles to thermal radiation decreases while those of combustion gases and fine particles originated from biomass combustion increase.

Subject Keywords

Spectral thermal radiation, Fine particles, Fluidized bed combustors, Co-combustion, Biomass

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104358339&origin=inward
https://hdl.handle.net/11511/90816

Journal

International Journal of Thermal Sciences

DOI

https://doi.org/10.1016/j.ijthermalsci.2021.107012

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Influence of soot on radiative heat transfer in bubbling fluidized bed combustors Yaşar, Mehmet Soner; Selçuk, Nevin; Külah, Görkem (2021-08-01) The effect of soot particles and aggregates on radiative heat transfer in bubbling fluidized bed combustors is investigated. For this purpose, a soot radiative property model based on Rayleigh scattering theory is coupled with in-house developed 1-D gray and spectral radiation codes and a 3-D spectral radiation code based on method of lines solution of discrete ordinates method for the application of (i) a 1-D slab problem involving combustion gases and soot and (ii) freeboard of a 0.3 MWt atmospheric bubbl...
Influence of spectral particle properties on radiative heat transfer in optically thin and thick media of fluidized bed combustors Ates, Cihan; Sen, Ozge; Selçuk, Nevin; Külah, Görkem (2017-12-01) In this study, influence of spectral particle properties on radiative heat transfer in the freeboard/dilute zone of fluidized bed combustors (FBCs) is investigated. The aim is to identify how important it is to involve spectral particle properties and to determine the predictive accuracy of gray Mie and gray Geometric Optics (GOA) approximations in optically thin and thick media by benchmarking their predictions against spectral solutions. For that purpose, input data required for modelling radiative heat t...
Assessment of improved banded model for spectral thermal radiation in presence of non-gray particles in fluidized bed combustors Yaşar, Mehmet Soner; Ozen, Guzide; Selçuk, Nevin; Külah, Görkem (2020-07-01) In this study, Bordbar's banded model is coupled with a 3-D radiation model based on method of lines (MOL) solution of discrete ordinates method (DOM) for modeling of radiative heat transfer in freeboard of METU 0.3 MWt ABFBC test rig where a typical Turkish lignite is fired with and without fly ash recycling. The accuracy and the computational efficiency of the model were assessed by benchmarking its predictions against banded SLW model. Furthermore, in order to show the effect of gas composition on predic...
Effect of recycle on radiative heat transfer in the freeboard of a fluidized bed combustor Selçuk, Nevin; Gogebakan, Yusuf (2005-05-25) Effect of recycle on radiative heat transfer in the freeboard of a fluidized bed combustor is investigated by applying a previously developed 3-D radiation model to the prediction of incident radiative heat fluxes along the freeboard walls of lignite-fired 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) Test Rig and comparing its predictions with measurements. Freeboard is treated as a rectangular enclosure containing gray, absorbing, emitting and isotrop...
Coupling of spectral thermal radiation model with a comprehensive system model for co-combustion of biomass in bubbling fluidized bed Yaşar, Mehmet Soner; Selçuk, Nevin; Külah, Görkem (2023-02-01) A previously developed 1-D comprehensive model for a bubbling fluidized bed combustor (BFBC) co-firing lignite with cotton residue and limestone is coupled with a 3-D spectral and gray radiation models utilizing method of lines (MOL) solution of discrete ordinates method (DOM). The performance of the coupled models is assessed by comparing their predictions of temperature profiles and gaseous emissions (i) with those of original FBC model without coupling and (ii) with the in-situ measurements from Middle E...

Citation Formats

M. S. Yaşar, N. Selçuk, and G. Külah, “Influence of bag filter ash to spectral thermal radiation in fluidized bed combustors Co-Fired with biomass,” International Journal of Thermal Sciences, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104358339&origin=inward.