Air and oxy-fuel combustion behaviour of petcoke/lignite blends

Fuel, Volume 92, Issue 1, February 2012, Pages 137-144

Air and oxy-fuel combustion behaviour of petcoke/lignite blends

Nur Sena Yuzbasi,Nevin Selçuk

sena.yuzbasi@metu.edu.tr

Department of Chemical Engineering, Middle East Technical University, 06531 Ankara, Turkey

Abstract

Describes investigation of the pyrolysis and combustion behaviour of a petroleum coke (petcoke), an indigenous lignite and their 70/30 wt.% blend in air and oxy-fuel conditions using non-isothermal thermo-gravimetric method (TGA) coupled with Fourier transform infrared (FTIR) spectrometer.

Blend samples were prepared by mixing lignite, which has low calorific value, high ash and moisture contents with petcoke that has high calorific value, low ash and moisture content, in the proportion of 70:30. Pyrolysis tests were carried out in nitrogen and carbon dioxide environments which are the main diluting gases of air and oxy-fuel environments, respectively.

Theoretical and experimental combustion profiles of the blend mainly display different trends, which indicate synergistic interactions between lignite and petcoke during their combustion in different environments.

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