Assessment of catalyst deactivation model for sulfur retention in fluidized bed combustors

Degirmenci, E
Gogebakan, Y
Selçuk, Nevin
An improved version of a combustion-desulfurization model for fluidized bed combustors burning high ash and sulfur content low quality lignite in its own ash with the addition of limestone is presented. The desulfurization model considers sulfur retention by both limestone and ash and is based on first order catalyst deactivation where the kinetics of desulfurization is described by two rate constants; one for the initial surface reaction, the other for the rate of pore plugging or deactivation. The accuracy of the complete model with experimentally determined deactivation rate constants was tested by applying it to a 0.3 MWt AFBC test rig and comparing its predictions with measurements. Comparisons show that the model produces reasonably accurate predictions of sulfur retention provided that the rate constants are determined experimentally under the fluidized bed combustor operating conditions.


Investigation of ash deposition in a pilot-scale fluidized bed combustor co-firing biomass with lignite
Gogebakan, Zuhal; Gogebakan, Yusuf; Selçuk, Nevin; Seliuk, Ekrem (2009-01-01)
This study presents the results from investigation of ash deposition characteristics of a high ash and sulfur content lignite co-fired with three types of biomass (olive residue, 49 wt%; hazelnut shell, 42 wt%; and cotton residue, 41 wt%) in 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustion (ABFBC) Test Rig. Deposit samples were collected on all air-cooled probe at a temperature of 500 degrees C. Samples were analyzed by SEM/EDX and XRD methods. The results reveal...
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...
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Tirkeş, Sera; Akgül, Çağla; Department of Civil Engineering (2021-9-7)
Coal bottom ash (BA) is a coarse, granular, incombustible by-product collected from the bottom of coal-burning furnaces. Traditionally, it has been handled by wet-handling systems (WHS) that use large amounts of water for cooling and conveying BA. WHS relies on established technologies such as impounded hoppers or submerged scraper conveyors. However, the need for water treatment, environmental concerns such as contaminated water, and high operational costs caused a necessary shift from WHS to more sustaina...
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Use of coal ash cement stabilized material as pavement base material: Laboratory characterization and field evaluation
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© 2022Coal fly ash (CFA) and coal bottom ash (CBA) are coal combustion's primary solid waste products. This solid waste management is a substantial challenge for power plants and local authorities. In order to apply coal ash as a pavement base material, the relationship of the mixture's mechanical properties with structural design parameters for pavement design and analysis must be explored. No study has investigated the mechanical behavior of the 100% coal ash cement stabilized material (CACSM) as a paveme...
Citation Formats
E. Degirmenci, Y. Gogebakan, and N. Selçuk, “Assessment of catalyst deactivation model for sulfur retention in fluidized bed combustors,” COMBUSTION SCIENCE AND TECHNOLOGY, pp. 95–111, 2000, Accessed: 00, 2020. [Online]. Available: