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Special Section on 2018 Clean Energy

Effect of Heat Treatment on the Combustion Characteristics of a Lignite

[+] Author and Article Information
Zhezi Zhang

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: zhezi.zhang@uwa.edu.au

Mingming Zhu

The University of Western Australia,
Centre for Energy (M473),
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: mingming.zhu@uwa.edu.au

Jianbo Li

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

Kai Zhang

Beijing Key Laboratory of Emission Surveillance
and Control for Thermal Power Generation,
North China Electric Power University,
Beijing 102206, China
e-mail: kzhang@ncepu.edu.cn

Guoqing Shen

Key Laboratory of Emission Surveillance and
Control for Thermal Power Generation,
North China Electric Power University,
Beijing 102206, China
e-mail: shenguoqing@ncepu.edu.cn

Gang Xu

Key Laboratory of Emission Surveillance and
Control for Thermal Power Generation,
North China Electric Power University,
Beijing 102206, China
e-mail: xg2008@ncepu.edu.cn

Xianchun Li

School of Chemical Engineering,
University of Science and Technology Liaoning,
Anshan 114051, China
e-mail: askd1972@163.com

Dongke Zhang

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: dongke.zhang@uwa.edu.au

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 23, 2018; final manuscript received February 7, 2019; published online March 11, 2019. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 141(7), 070705 (Mar 11, 2019) (6 pages) Paper No: JERT-18-1652; doi: 10.1115/1.4042823 History: Received August 23, 2018; Revised February 07, 2019

In this study, the ignition and combustion behavior of raw and heat-treated single particles of lignite were experimentally investigated, with a focus on the effect of heat treatment temperatures. The lignite particles were heat treated to various final temperatures (473, 623 and 773 K) in nitrogen and characterized using proximate, ultimate, and Fourier transform infrared spectroscopy (FTIR) analysis. A single lignite particle of 2 or 3 mm in diameter was suspended on a silicon carbide fiber and burned in air in a horizontal tube furnace operating at 1123 K. The ignition and combustion process of the particle was record using a color CCD camera at 25 fps. The ignition mechanism, ignition delay time, volatile flame duration, and burnout time of the single particles were examined by processing the recorded images. The proximate and ultimate analysis results indicated that the volatile matter and oxygen contents decreased, while the carbon content increased with increasing temperature of heat treatment. This trend was consistent with observations in the FTIR analysis, in which the intensity of oxygen-containing functional groups decreased with increasing the heat treatment temperature. The ignition of raw and heat treated lignite particles followed a joint hetero-homogeneous mechanism under all conditions studied. The ignition delay time, volatile flame extinction time, and the total combustion time decreased with increasing heat treatment temperature up to 623 K. A further increase in the heat treatment temperature to 773 K resulted in prolonged key ignition and combustion characteristic times.

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Figures

Grahic Jump Location
Fig. 1

A schematic diagram of the apparatus for the single particle combustion experiments

Grahic Jump Location
Fig. 2

A schematic diagram showing the definitions of key ignition and combustion characteristics of single lignite particles

Grahic Jump Location
Fig. 3

FTIR spectra of raw Zhundong lignite and Zhundong lignite heat treated at 473 K, 623K, and 773 K

Grahic Jump Location
Fig. 4

Typical sequences of images of 2 mm raw and heat treated Zhundong lignite particles burning at 1123 K in air: (a) ZDL-raw, (b) ZDL-473, (c) ZDL-623, and (d) ZDL-773

Grahic Jump Location
Fig. 5

Variations of the heterogeneous ignition time, homogeneous ignition time, volatile flame extinction time and the total combustion time of single Zhundong lignite particles of (a) 2 mm and (b) 3 mm in diameter burning in air at 1123 K

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