Research Papers: Fuel Combustion

Synergistic Interactions During Cocombustion of Lignite, Biomass, and Their Chars

[+] Author and Article Information
A. Caliskan Sarikaya

Department of Chemical Engineering,
Chemical and Metallurgical Engineering Faculty,
Istanbul Technical University,
Maslak, 34469 Istanbul, Turkey
e-mail: caliskanays@itu.edu.tr

H. Haykiri Acma

Department of Chemical Engineering,
Chemical and Metallurgical Engineering Faculty,
Istanbul Technical University,
Maslak, 34469 Istanbul, Turkey
e-mail: hanzade@itu.edu.tr

S. Yaman

Department of Chemical Engineering,
Chemical and Metallurgical Engineering Faculty,
Istanbul Technical University,
Maslak, 34469 Istanbul, 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 7, 2019; final manuscript received June 10, 2019; published online July 8, 2019. Assoc. Editor: Dr. Ashwani K. Gupta.

J. Energy Resour. Technol 141(12), 122203 (Jul 08, 2019) (12 pages) Paper No: JERT-19-1131; doi: 10.1115/1.4044057 History: Received March 07, 2019; Accepted June 15, 2019

Woody biomasses such as ash tree (AT), hybrid poplar (HP), and rhododendron (RD) were subjected to torrefaction and carbonization at temperatures of 200 °C and 400 °C. Likewise, several lignite samples were carbonized at 750 °C. Various binary fuel blends such as raw lignite/raw biomass, raw lignite/biochar, lignitic char/raw biomass, and lignitic char/biochar were prepared where the fraction of biomass or biochar was 10 wt% in the blends. The cocombustion characteristics of these blends were investigated through a thermal analysis method from the synergetic point of view considering the fuel properties and the combustion performance. Some parameters relevant to the combustion reactivity such as ignition point, maximum rate, peak temperature, and burnout temperature were commented to figure out whether synergistic interaction or additive behavior governs the combustion characteristics of the blends. Also, the combustion performance indices such as ignition index (Ci), burnout index (Cb), comprehensive combustibility index (S), and the burning stability index (DW) were estimated. It was concluded that the combinations of the additive behavior and the synergistic interactions governs the cocombustion process, and the kind of the fuels and their thermal history determine the reactivity and the interactions during cocombustion.

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Grahic Jump Location
Fig. 1

Experimental procedure

Grahic Jump Location
Fig. 2

SEM images of lignite samples and the lignitic chars

Grahic Jump Location
Fig. 3

SEM images of biomass samples and biochars

Grahic Jump Location
Fig. 4

DTG curves for CD lignite

Grahic Jump Location
Fig. 5

DTA curves for CD lignite



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