LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

Thermogravimetric analyses of oxy-fuel co-combustion of semi-coke and bituminous coal

Photo from wikipedia

Abstract Semi-coke is blended with bituminous coal in oxygen-enriched atmospheres to be efficiently used as an energy source. Combustion characteristics and kinetic behavior of blends under oxygen-enriched atmosphere are studied… Click to show full abstract

Abstract Semi-coke is blended with bituminous coal in oxygen-enriched atmospheres to be efficiently used as an energy source. Combustion characteristics and kinetic behavior of blends under oxygen-enriched atmosphere are studied with thermogravimetric analysis. The ignition temperature of each sample in 21%O2/79%CO2 atmosphere is about 15 °C higher than that in air. The burnout behavior of semi-coke is significantly improved when N2 is replaced by CO2 at the same oxygen concentration. Increasing oxygen concentration can improve ignition and burnout behaviors further. Differential thermogravimetry (DTG) curves of semi-coke show quite different behaviors in air and 21%O2/79%CO2 atmospheres. There are two distinct peaks in air, while in 21%O2/79%CO2, there is only one. Activation energies of blends are obtained by Starink method at four heating rates. These activation energy values are, then, used to determine the most probabilistic mechanism function of each stage by Malek method. The results show that the activation energy usually decreases with the increase of the conversion degree and the proportion of bituminous coal. The average activation energy in air atmosphere is slightly smaller than that in 21%O2/79%CO2 atmospheres. It is worth noting that the activation energies of the blends increase with the increase of oxygen concentrations.

Keywords: bituminous coal; semi coke; oxygen; energy

Journal Title: Applied Thermal Engineering
Year Published: 2019

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.