Modelling of FBC of lignite with high nitrogencontet cotton Residue

Date

2019-06-16

Author

Yaşar, Mehmet Soner
Selçuk, Nevin
Külah, Görkem

Metadata

Show full item record

Item Usage Stats

214
views

0
downloads

A comprehensive system model, previously developed for prediction of combustion behaviors of Turkish lignites, lignite/hazelnut shell, and lignite/olive residue blends in a 0.3-MWt atmospheric bubbling fluidized bed combustor (ABFBC), is extended for modeling of co-combustion of Turkish lignite and cotton residue. Cotton residue has high nitrogen content (~4.1 wt% ar) unlike lignite (~0.9 wt% ar), olive residue (~1.6 wt% ar), and hazelnut shell (~0.5 wt% ar), which leads to relatively high emissions of nitric oxides (NOx) and nitrous oxide (N2O). For accurate prediction of emissions of NO and N2O, a sufficiently detailed NO and N2O formation and reduction reaction scheme is incorporated into the existing model. The assessment of the accuracy of the model is tested by comparing its predictions with the experimental data obtained in a 0.3-MWt ABFBC where a typical Turkish lignite is co-fired with limestone and cotton residue. Reasonable agreement is obtained between the predicted and measured O2, CO, CO2, SO2, NO, and N2O concentrations and temperature profiles. The results obtained in this study show that the addition of cotton residue increases emission of total nitrogenous species due to its high nitrogen content, but the main effect is observed in the increase of N2O formation. Furthermore, determination of the fuel nitrogen partitioning into char and volatiles and distribution of volatile nitrogen species are found to be the most important parameters for modeling of NO and N2O emissions in bubbling fluidized bed combustors.

URI

https://hdl.handle.net/11511/74971

Conference Name

11th Mediterranean Combustion Symposium, (16 - 20 Haziran 2019)

Collections

Department of Chemical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Modeling of Fluidized Bed Combustion of Lignite with High Nitrogen Content Cotton Residue Yasar, M. S.; Selçuk, Nevin; Kulah, G. (2019-11-10) A comprehensive system model, previously developed for prediction of combustion behaviors of Turkish lignites, lignite/hazelnut shell, and lignite/olive residue blends in a 0.3-MWt atmospheric bubbling fluidized bed combustor (ABFBC), is extended for modeling of co-combustion of Turkish lignite and cotton residue. Cotton residue has high nitrogen content (similar to 4.1 wt% ar) unlike lignite (similar to 0.9 wt% ar), olive residue (similar to 1.6 wt% ar), and hazelnut shell (similar to 0.5 wt% ar), which le...
Mathematical modeling of a bubbling fluidized bed combustor co-fired with cotton residue and lignite Yaşar, Mehmet Soner; Külah, Görkem; Selçuk, Nevin; Department of Chemical Engineering (2018) A comprehensive system model, previously developed for prediction of combustion behaviors of Turkish lignites, lignite/hazelnut shell and lignite/olive residue blends in fluidized bed combustors, is extended for modeling of co-combustion of Turkish lignite and cotton residue in a bubbling fluidized bed combustor. Cotton residue has high nitrogen content (~ 4.1 wt. % a.r.) unlike lignite (~ 0.9 wt. % a.r.), olive residue (~ 1.6 wt. % a.r.) and hazelnut shell (~ 0.5 wt. % a.r.), which leads to relatively high...
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 ...
Simulation of circulating fluidized bed combustors firing indigenous lignite Özkan, Mert; Selçuk, Nevin; Department of Chemical Engineering (2010) A comprehensive model, previously developed for a rectangular parallelepiped shaped 0.3 MWt circulating fluidized bed combustor (CFBC) fired with high calorific value coal burning in sand and validated against experimental data is adapted to cylindrical configuration and is extended to incorporate NOx formation and reduction reactions and pressure drops around cyclone, downcomer and loop seal. Its predictive accuracy is tested by applying it to the simulation of Middle East Technical University (METU) 150 k...
Influence of bag filter ash to spectral thermal radiation in fluidized bed combustors Co-Fired with biomass Yaşar, Mehmet Soner; Selçuk, Nevin; Külah, Görkem (2021-09-01) 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 s...

Citation Formats

M. S. Yaşar, N. Selçuk, and G. Külah, “Modelling of FBC of lignite with high nitrogencontet cotton Residue,” presented at the 11th Mediterranean Combustion Symposium, (16 - 20 Haziran 2019), Tenerife, İspanya, 2019, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/74971.