Research Papers: Environmental Aspect of Energy Sources

Unburnt Carbon From Oxygen-Enriched Combustion of Low-Quality Fuels at Low Temperatures

[+] Author and Article Information
H. Haykiri-Acma

Chemical Engineering Department,
Istanbul Technical University,
Istanbul 34469, Turkey

S. Yaman

Chemical Engineering Department,
Istanbul Technical University,
Istanbul 34469, Turkey
e-mail: yamans@itu.edu.tr

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 30, 2018; final manuscript received July 3, 2018; published online August 9, 2018. Assoc. Editor: Reza Sheikhi.

J. Energy Resour. Technol 141(1), 012101 (Aug 09, 2018) (5 pages) Paper No: JERT-18-1240; doi: 10.1115/1.4040792 History: Received March 30, 2018; Revised July 03, 2018

This paper investigates the effectiveness of oxygen-enriched combustion process at low temperatures to avoid the unburnt carbon that remains in ash during conventional burning process. For this, thermal treatment of low-quality fuels such as olive pomace and Turkish lignite (Afsin-Elbistan) under oxygen-enriched conditions was tested in a tube furnace at temperatures between 400 and 700 °C under O2/N2 mixtures containing O2 ratios in the range of 25–50 vol %. The calorific value and the unburnt carbon content of the residues from these tests were used to investigate the combined effects of temperature and O2 concentration on unusable part of fuels. Thermal reactivity of untreated parent samples and the residues obtained from oxygen-enriched combustion was also compared based on differential thermal analysis (DTA) and derivative thermogravimetry (DTG) profiles. It was determined that oxygen-enriched conditions are able to remove the organic part of the fuels at low temperatures easily as O2 concentration increases and the oxygen-enriched conditions shifted complete burning temperature to lower values.

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Grahic Jump Location
Fig. 1

Schematic of the setup and experimental procedure

Grahic Jump Location
Fig. 2

Differential thermal analysis and DTG burning profiles of the parent samples

Grahic Jump Location
Fig. 3

Differential thermal analysis and DTG burning curves of the residues from lignite

Grahic Jump Location
Fig. 4

Differential thermal analysis and DTG burning curves of the residues from pomace



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