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Research Papers: Fuel Combustion

Effect of Char Structure Evolution During Pyrolysis on Combustion Characteristics and Kinetics of Waste Biomass

[+] Author and Article Information
Yanshan Yin

School of Energy and Power Engineering,
Changsha University of Science & Technology,
No. 960, 2nd Section,
South Wanjiali Road,
Changsha 410114, China
e-mail: yinyanshan5431@163.com

Jie Yin

School of Energy and Power Engineering,
Changsha University of Science & Technology,
South Wanjiali Road,
Changsha 410114, China
e-mail: 469209777@qq.com

Wei Zhang

School of Energy and Power Engineering,
Changsha University of Science & Technology,
South Wanjiali Road,
Changsha 410114, China
e-mail: wei_zhang@hnu.edu.cn

Hong Tian

School of Energy and Power Engineering,
Changsha University of Science & Technology,
South Wanjiali Road,
Changsha 410114, China
e-mail: tianh1103@163.com

Zhangmao Hu

School of Energy and Power Engineering,
Changsha University of Science & Technology,
South Wanjiali Road,
Changsha 410114, China
e-mail: huzhangmao@163.com

Min Ruan

School of Energy and Power Engineering,
Changsha University of Science & Technology,
South Wanjiali Road,
Changsha 410114, China
e-mail: maggie_rm@163.com

Ziyou Song

School of Energy and Power Engineering,
Changsha University of Science & Technology,
South Wanjiali Road,
Changsha 410114, China
e-mail: 461850583@qq.com

Liang Liu

School of Energy and Power Engineering,
Changsha University of Science & Technology,
South Wanjiali Road,
Changsha 410114, China
e-mail: liuliang_hn@126.com

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 10, 2017; final manuscript received January 12, 2018; published online March 20, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 140(7), 072203 (Mar 20, 2018) (10 pages) Paper No: JERT-17-1556; doi: 10.1115/1.4039445 History: Received October 10, 2017; Revised January 12, 2018

Two waste biomass materials, pine needle (PN) and corn stalk (CS), were pyrolyzed at different temperatures (200–900 °C). The organic functional groups and carbonaceous structure of the biomass chars were characterized by Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy, respectively. The combustion characteristics and kinetics of biomass chars were investigated by thermogravimetric analysis (TGA). The content of carbon-, hydrogen-, and oxygen-containing functional groups in the biomass samples decreases with an increase in preparation temperature, leading to more aromatic macromolecular structure at elevated pyrolysis temperatures. With increasing pyrolysis temperature, the comprehensive combustibility index (S) of both chars related to combustion reactivity generally decreases especially for CS char because of the loss of active groups. However, the Raman spectra show that the degree of order decreases with increasing pyrolysis temperature from 400 to 700 °C because of the generation of isolated sp2 carbon.

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Figures

Grahic Jump Location
Fig. 1

Variation of biomass char yield with pyrolysis temperature

Grahic Jump Location
Fig. 2

FTIR spectra of (a) PN and (b) CS samples prepared at different temperatures

Grahic Jump Location
Fig. 3

Raman spectra of (a) PN and (b) CS chars

Grahic Jump Location
Fig. 4

Curve-fitting of Raman spectra of (a) PN and (b) CS chars produced at 900 °C

Grahic Jump Location
Fig. 5

Variation of the (a) D1 band position, (b) band area ratio ID1/IG, (c) band area ratio ID1/Iall, (d) band area ratio IG/Iall, (e) band area ratio ID/Iall, and (f) total band areas of biomass chars with pyrolysis temperature. The value of D band area is the sum of the D1, D3, and D4 band areas.

Grahic Jump Location
Fig. 6

TG and DTG curves for the combustion of raw biomass samples and their chars prepared at 900 °C

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