Validation of a FBC model for co-firing of hazelnut shell with lignite against experimental data

Date

2010-07-01

Author

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

86
views

0
downloads

Performance of a comprehensive system model extended for modelling of co-firing of lignite and biomass was assessed by applying it to METU 0.3 MW(t) Atmospheric Bubbling Fluidized Bed Combustor co-firing lignite with hazelnut shell and validating its predictions against on-line temperature and concentration measurements of O(2), CO(2), CO, SO(2) and NO along the same test rig fired with lignite only, lignite with limestone addition and lignite with biomass and limestone addition. The system model accounts for hydrodynamics; volatiles release and combustion, char combustion, particle size distribution for lignite and biomass; entrainment; elutriation; sulfur retention and NO formation and reduction, and is based on conservation equations for energy and chemical species. Special attention was paid to different devolatilization characteristics of lignite and biomass. A volatiles release model based on a particle movement model and a devolatilization kinetic model were incorporated into the system model separately for both fuels. Kinetic parameters for devolatilization were determined via thermogravimetric analysis. Predicted and measured temperatures and concentrations of gaseous species along the combustor were found to be in good agreement. Introduction of biomass to lignite was found to decrease SO(2) emissions but did not affect NO emissions significantly. The system model proposed in this study proves to be a useful tool in qualitatively and quantitatively simulating the processes taking place in a bubbling fluidized bed combustor burning lignite with biomass.

Subject Keywords

Mechanical Engineering, Nuclear Energy and Engineering, General Chemical Engineering, Fluid Flow and Transfer Processes, Aerospace Engineering

URI

https://hdl.handle.net/11511/40647

Journal

EXPERIMENTAL THERMAL AND FLUID SCIENCE

DOI

https://doi.org/10.1016/j.expthermflusci.2009.12.006

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Comparison of Fenitrothion and Trifluralin Adsorption on Organo-Zeolites and Activated Carbon. Part II: Thermodynamic Parameters and the Suitability of the Kinetic Models of Pesticide Adsorption LÜLE ŞENÖZ, Güzide Meltem; Atalay, Mustafa Ümit (Informa UK Limited, 2014-07-04) The suitability of two kinetic models and the thermodynamic parameters of pesticide adsorption were investigated based on obtained data of previous studies. Kinetic evaluation indicated that the pesticides adsorption on adsorbents followed the pseudo-second-order model. Gibbs free energy (Delta G degrees), enthalpy (Delta H degrees), and entropy (Delta S degrees) were calculated for thermodynamic parameters by using linearized Arrhenius equation. The results indicated that the sorption process of fenitrothi...
A new correlation for minimum spouting velocity for conical spouted beds operating with high density particles GOLSHAN, Shahab; YAMAN, Onur; KÖKSAL, MURAT; Külah, Görkem; ZARGHAMI, Reza; MOSTOUFI, Navid (Elsevier BV, 2018-09-01) Hydrodynamics of conical spouted beds operating with high density particles was studied by means of measuring the minimum spouting velocity and analysis of pressure signals in time and frequency domains. Three different types of particles, zirconia (d(p) = 1 mm; rho(p) = 6050 kg/m(3)), zirconia toughened alumina (rho(p) = 3700 kg/m(3); d(p) = 1, 2 and 2.4 mm) and glass beads (rho(p) = 2460 kg/m(,)(3) d(p) = 1 and 2 mm) were used in the experiments. Experiments were performed in three small scale (gamma = 30...
Optimization of the locations of side streams in a filter cake washing process Gucbilmez, Y; Tosun, I; Yılmaz, Levent (Informa UK Limited, 2000-01-01) A macroscopic model was developed to perform optimization studies for countercurrent, nonequilibrium, displacement filter cake washing on a belt filter with incoming side streams. Each washing stage was assumed to contain a number of perfect mixing cells connected in series. The optimum locations of the side streams, which yielded the minimum exit solute concentration for the washed cake, were evaluated. Three cases were considered: Incoming side stream added to the wash liquor flow, incoming side stream ad...
EVALUATION OF SECOND VIRIAL COEFFICIENTS FROM SATURATION DATA Orbey, H.; Orbey, N. (Informa UK Limited, 1989-3) A data reduction technique is introduced for the evaluation of second virial coefficients of gases at subcritical temperatures. The method makes use of the vapor-liquid equilibrium data, i.e., temperature, saturation pressure, liquid and vapor molar volumes and can be used to obtain second virial coefficients of a wide variety of fluids including polar, associating and quantum gases. The calculated second virial coefficients are in good agreement with their counterparts from literature, which are obtained f...
Fabrication and characterization of p-Si/n-ZnO heterostructured junctions Klason, P.; Rahman, M. M.; Hu, Q. -H.; Nur, O.; Turan, Raşit; Willander, M. (Elsevier BV, 2009-04-01) In this paper ZnO nanorods and nanodots (with and without a SiO2 buffer layer) were grown on p-Si, forming p-n heterojunctions. The nanorod devices showed no visible electroluminescence (EL) emission but showed rectifying behavior. Covering around 60% of the length of the nanorods with PMMA produced an ideality factor of 3.91 +/- 0.11 together with a reverse saturation current of 6.53 +/- 4.2 x 10(-8) A. Up to two orders of magnitude rectification was observed for the current at bias -3 and 3 V. The nanodot...

Citation Formats

G. Külah, “Validation of a FBC model for co-firing of hazelnut shell with lignite against experimental data,” EXPERIMENTAL THERMAL AND FLUID SCIENCE, pp. 646–655, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40647.