Comparison of single particle combustion behaviours of raw and torrefied biomass with Turkish lignites

Date

2019-04-01

Author

Magalhaes, Duarte
Panahi, Aidin
Kazanç Özerinç, Feyza
Levendis, Yiannis A.

Metadata

Show full item record

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

Item Usage Stats

154
views

0
downloads

This study investigated the combustion behaviour of single pulverized biomass and lignite coal particles under high temperature-high heating rate conditions. Selected fuels included three important agricultural residues in Turkey (olive residue, almond shell, and hazelnut shell), and two lignite coals from the regions of Tuncbilek and Soma in Turkey. Biomass fuels were either raw or torrefied at 275 degrees C for 30 min in nitrogen. The biomass fuels were sieved to a size cut of 212-300 mu m, and the coals were sieved to 106-125 mu m. An optically-accessible drop tube furnace, operated at a wall temperature of 1400 K, was used to burn single fuel particles in air. High-speed cinematography and three-colour pyrometry were used to characterise the combustion behaviour of the fuel particles. All biomass particles ignited homogeneously forming large and circular volatile matter envelope flames, followed by distinct char combustion phases. The Tuncbilek lignite also ignited homogeneously and burned in two combustion stages, first forming bright sooty and elongated flames with contrails, upon extinction of which char combustion ensued. The Soma lignite exhibited extensive fragmentation which resulted in surface ignition of the fragments and gas-phase ignition of the main non-fragmented particle. The cumulative burnout times of all raw and torrefied biomass particles of the selected size cut were shorter or equal to those of the Tuncbilek lignite but longer than those of the Soma lignite. This result signifies the appropriateness for co-firing such biomass fuel particles in furnaces designed for the former coal, rather than those designed for the latter.

Subject Keywords

Fuel Technology, Organic Chemistry, Energy Engineering and Power Technology, General Chemical Engineering

URI

https://hdl.handle.net/11511/38516

Journal

FUEL

DOI

https://doi.org/10.1016/j.fuel.2018.12.124

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Influence of coal briquette size on the combustion kinetics Altun, Naci Emre; Bagci, AS (Elsevier BV, 2004-08-15) In this study, the effects of one of the most important parameters in coal briquetting process, the briquette size, on the combustion behaviour of coal briquettes were determined from the view of combustion kinetics, i.e. their liability to ignite and combust. Effect of size on the combustion kinetics was treated by two different approaches. The first one consists of combustion kinetics experiments with briquettes of increasing sizes, thus of expanding volumes. In the second phase, briquette dimensions were...
PREDICTION OF BED MATERIAL ACTIVITY FROM CHANGES IN CARBON-DIOXIDE CONCENTRATION FOLLOWING COAL PARTICLE INJECTION IN THE FLUIDIZED-BED REACTOR VURAL, H (Elsevier BV, 1994-01-01) An electrically heated laboratory scale fluidized bed reactor was used for measurement of carbon dioxide concentrations from the devolatilization of bituminous coal under conditions pertinent to a large scale atmospheric pressure fluidized bed combustor (AFBC). Feeding a few particles into the bed, which contained 1 or 2 g of char, produced an increase in CO2 concentration. The quantity of CO2 released from the fluidized bed was found to be a function of fluidizing solid material, as well as the bed tempera...
Analytical investigation of wet combustion process for heavy oil recovery Bağcı, Ali Suat (Informa UK Limited, 2004-12-01) Analysis of combustion tube data produced from experiments performed under realistic reservoir conditions is currently the most valid method of investigating in-situ combustion process. In this study, the optimization of water-air ratio for B. Kozluca heavy crude oil, and the comparison of the performance of dry and wet forward combustion processes were studied. An analytical model was used to extend the laboratory results so that the oil production and steam zone volume can be estimated under field conditi...
Modeling and numerical simulations of lignite char gasification with CO2: The effect of gasification parameters on internal transport phenomena Karaca, Mehmet; Kaya, Deniz; Yozgatlıgil, Ahmet; Gokalp, Iskender (Elsevier BV, 2021-02-01) The purpose of this study is to develop an experimental data-based char particle gasification model in order to assess the effects of particle size, gasification temperature and char generation heating rate on global gasification parameters. Also, the effect of initial porosity is observed by performing parametrical numerical simulations. A continuum-based model is used to solve the gasification inside a char particle and within the external boundary layer. The intrinsic rate of CO2 gasification reaction is...
A study on the effects of catalysts on pyrolysis and combustion characteristics of Turkish lignite in oxy-fuel conditions ABBASI-ATIBEH, Ehsan; Yozgatlıgil, Ahmet (Elsevier BV, 2014-01-01) The catalytic pyrolysis and combustion characteristics of low calorific value Turkish lignite in various ambient conditions were explored and the evolution of gases during pyrolysis tests was examined using a Thermogravimetric Analyzer coupled with a Fourier Transform Infrared spectrometer (TGA-FTIR). Potassium carbonate (K2CO3), calcium hydroxide (Ca(OH)(2)) and iron (III) oxide (Fe2O3) were employed as precursors of the catalysts and compared to the Raw-form (no catalyst added) to investigate the effects ...

Citation Formats

D. Magalhaes, A. Panahi, F. Kazanç Özerinç, and Y. A. Levendis, “Comparison of single particle combustion behaviours of raw and torrefied biomass with Turkish lignites,” FUEL, pp. 1085–1094, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38516.