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Research Papers: Fuel Combustion

Experimental Research on Catalytic Combustion Characteristics of Inferior Coal and Sludge Mixture

[+] Author and Article Information
Yunfei Yan

Key Laboratory of Low-Grade Energy
Utilization Technologies and Systems,
Ministry of Education,
Chongqing University,
Chongqing 400044, China
e-mail: yunfeiyan@cqu.edu.cn

Shuai Feng

Key Laboratory of Low-Grade Energy
Utilization Technologies and Systems,
Chongqing University,
Chongqing 400044, China
e-mail: shuaifengkelvin@yeah.net

Li Zhang

Key Laboratory of Low-Grade Energy
Utilization Technologies and Systems,
Chongqing University,
Chongqing 400044, China
e-mail: lizhang@cqu.edu.cn

Lixian Li

Chongqing Cancer Institute and
Hospital and Cancer Center,
Chongqing 400030, China
e-mail: lilixian2010@yahoo.com

Lei Zhang

Key Laboratory of Low-Grade Energy
Utilization Technologies and Systems,
Chongqing University,
Chongqing 400044, China
e-mail: 593566507@qq.com

Zhongqing Yang

Key Laboratory of Low-Grade Energy
Utilization Technologies and Systems,
Chongqing University,
Chongqing 400044, China
e-mail: zqyang@cqu.edu.cn

1Corresponding authors.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 17, 2017; final manuscript received July 5, 2017; published online September 28, 2017. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 140(3), 032201 (Sep 28, 2017) (6 pages) Paper No: JERT-17-1231; doi: 10.1115/1.4037373 History: Received May 17, 2017; Revised July 05, 2017

Catalytic effects of metal oxides on combustion characteristics of inferior coal, sludge, and their mixture were investigated by thermogravimetric analysis. Combustion and thermal dynamic characteristics including ignition temperatures, apparent activation energy, and frequency factors of inferior coal, sludge, and their mixture were observed. The catalytic effects and mechanism of combustion were discussed. Results showed that thermal gravity analysis (TG) and derivative thermogravimetric analysis (DTG) curves of coal and sludge shifted to lower temperature side, the weight losses increased, and the ignition performance was improved with the addition of metal oxides CaO, Al2O3, and K2O. The combustion dynamics analysis showed that the apparent activation energy of cocombustion of coal blending sludge decreased by 11–20% and the frequency factors increased by 20–30%. The minimum apparent activation energy and the maximum frequency factors were obtained in the presence of K2O, indicating that the catalytic effect of K2O was most significant.

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Figures

Grahic Jump Location
Fig. 1

Scanning electron microscope image of the sample 1 (a) and (b), 2 (c) and (d), and 3 (e) and (f)

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Fig. 2

TG and DTG curves of different samples: (a) for TG and (b) for DTG

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Fig. 3

TG and DTG curves of coal combustion under different catalysts: (a) for TG and (b) for DTG

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Fig. 4

TG and DTG curves of Jiguanshi sludge combustion under different catalysts: (a) for TG and (b) for DTG

Grahic Jump Location
Fig. 5

TG and DTG curves of cocombustion under different catalysts: (a) for TG and (b) for DTG

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