Assessment of a model with char attrition for a bubbling atmospheric fluidized-bed combustor

Date

2004-05-01

Author

Gogebakan, Y
Selçuk, Nevin

Metadata

Show full item record

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

Item Usage Stats

234
views

0
downloads

A comprehensive model, previously developed and tested for prediction of behavior of continuous fluidized-bed combustors, is extended to incorporate char attrition and is applied to the simulation of a 0.3 MegaWatt (MW) atmospheric bubbling fluidized-bed combustor burning lignites with high Volatile Matter/Fixed Carbon (VM/FC) ratios in their own ashes. The effect of this incorporation is assessed by comparing the predictions of the model with and without attrition with measurements. Favorable comparisons obtained between predicted and measured temperature and concentration profiles and carryover char particle size distributions imply that these parameters are not sensitive to char attrition for lignites and the operating conditions under consideration. However, comparisons between combustion efficiencies predicted with and without char attrition and those obtained from measurements show that consideration of char attrition is essential for accurate prediction of combustion efficiencies.

Subject Keywords

Lignite, Char attrition, Fluidized-bed combustion

URI

https://hdl.handle.net/11511/31048

Journal

COMBUSTION SCIENCE AND TECHNOLOGY

DOI

https://doi.org/10.1080/00102200490428413

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Modeling of NOx emissions from fluidized bed combustion of high volatile lignites Afacan, Onur; Gogebakan, Yusuf; Selçuk, Nevin (2007-01-01) A comprehensive model, previously developed and tested for prediction of behavior of continuous fluidized bed combustors is extended to incorporate NOx formation and reduction reactions and applied to the simulation of Middle East Technical University (METU) 0.3 MW Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) burning lignites with high Volatile Matter/Fixed Carbon (VM/FC) ratios in their own ashes. Favorable comparisons are obtained between the predicted and measured temperatures and concentrations ...
Mathematical Modeling of a Bubbling Fluidized Bed Combustor Cofired with Lignite and Biomass Külah, Görkem; Selçuk, Nevin (2010-01-01) A comprehensive system model of fluidized bed combustor, previously developed and tested for the prediction of combustion behavior of fluidized bed combustors fired with lignite was extended for the modeling of cofiring of lignite with biomass by incorporating volatile release, char combustion, and population balance for biomass. The model predictions were validated against measurements taken on a Middle East Technical University 0.3 MWt Atmospheric Bubbling Fluidized Bed Combustor fired with lignite only, ...
Analysis of material collected on particles exposed to volatile matter of bituminous coal in a fluidized bed Vural, H (1997-05-01) The activity of fluidized bed particles towards the volatile matter of a bituminous coal was analysed by measurement of tar yield and the direct measurement of CO2 concentration in the exhaust gas from the devolatilization of bituminous coal particles in a laboratory-scale fluidized bed reactor. In a third approach, thermogravimetric analysis (t.g.a.) of the fluidizing particles was performed, indicating that calcium-containing particles exhibited the largest weight loss. In a fourth approach, a mass spectr...
Evaluation of an improved code for the performance of AFBCs Selçuk, Nevin; Oymak, O (1997-03-01) In a previously developed system model, bed and freeboard models were coupled for the continuous combustion of lignite particles of widely varied size distributions, burning in their own ash in a fluidised combustor. This was modified to incorporate a) a procedure for faster computation of particle-size distributions (PSDs) without any sacrifice of accuracy; b) an energy balance on char particles, for determining temperature variation with particle size; and c) assumption of plug flow for the interstitial g...
Modeling of a bubbling AFBC with volatiles release Selçuk, Nevin; Gogebakan, Y (2003-03-01) comprehensive model for continuous combustion of lignite with wide size distribution burning in its own ash in an atmospheric bubbling fluidized bed combustor (ABFBC) has been presented and used to correlate the data from a 0.3 MW ABFBC test rig. The model consists of submodels for hydrodynamics, volatiles release and combustion, char combustion, particle size distribution, entrainment and elutriation and is based on conservation equations for energy and chemical species. The volatiles release model is base...

Citation Formats

Y. Gogebakan and N. Selçuk, “Assessment of a model with char attrition for a bubbling atmospheric fluidized-bed combustor,” COMBUSTION SCIENCE AND TECHNOLOGY, pp. 799–818, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31048.