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research-article

Effects of Pretreatment outside of Torrefaction Range on Combustion Characteristics of Chars from Lignocellulosic Biomass

[+] Author and Article Information
Aysen Caliskan Sarikaya

Istanbul Technical University, Chemical and Metallurgical Engineering Faculty, Chemical Engineering Department Maslak Istanbul, 34469 Turkey caliskanays@itu.edu.tr

Hanzade Haykiri-Acma

Istanbul Technical University Istanbul, Istanbul 34469 Turkey hanzade@itu.edu.tr

Serdar Yaman

Istanbul Technical University Chemical and Metallurgical Engineering Faculty Istanbul, Istanbul 34469 Turkey yamans@itu.edu.tr

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received November 6, 2018; final manuscript received December 21, 2018; published online xx xx, xxxx. Assoc. Editor: Matthew Oehlschlaeger.

ASME doi:10.1115/1.4042589 History: Received November 06, 2018; Accepted December 21, 2018

Abstract

Lignocellulosic woody biomasses such as Rhododendron (RD), ash tree (AT), and hybrid poplar (HP) were heated under N2 at 200°C and 400°C which are regarded as out of range of efficient torrefaction temperatures. Also, several Turkish brown coals were carbonized at 750°C for comparison. The obtained biochars/chars were characterized by analyses, SEM (Scanning Electron Microscopy), and FTIR (Fourier Transform Infrared Spectroscopy), and thermal analysis. Combustion reactivity of the raw samples and the chars were estimated using the burning profiles. Burning kinetics were established by Borchardt & Daniels (B&D) kinetic analysis method that bases on evaluation of DSC (Differential Scanning Calorimetry) data. Ignition index (Ci), burnout index (Cb), comprehensive combustibility index (S), and burning stability index (DW) were considered to evaluate the combustion performance. It was concluded that although treatment at 200°C did not lead considerable changes on biomass structure, the combustion performance of the treated biomass became highly improved in comparison to the raw biomass. Whereas, treatment at 400°C led to serious variations in the biomass structure mainly due to reduction in O content and volatiles so that the fuel properties and the burning characteristics were affected, and combustion performance was negatively influenced.

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