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Research Papers: Fuel Combustion

Secondary Spontaneous Combustion Characteristics of Coal Based on Programed Temperature Experiments

[+] Author and Article Information
Gang Wang

Mine Disaster Prevention and Control-Ministry
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China;
Hebei State Key Laboratory of
Mine Disaster Prevention,
North China Institute of Science and Technology,
Beijing 101601, China
e-mail: Gang.Wang@sdust.edu.cn

Qiqi Liu

Mine Disaster Prevention and Control-Ministry
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: 15764227280@139.com

Lulu Sun

Mine Disaster Prevention and Control-Ministry
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: sunsdust@126.com

Xiang Song

Mine Disaster Prevention and Control-Ministry
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: 15764250761@163.com

Wenzhou Du

Mine Disaster Prevention and Control-Ministry
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: duwenzhou-01@163.com

Daocheng Yan

Key Laboratory of Coal Methane
and Fire Control,
Ministry of Education,
China University of Mining and Technology,
Xuzhou 221116, Jiangsu, China
e-mail: ydc19940214@163.com

Yue Wang

Mine Disaster Prevention and Control-Ministry
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: sdkdwangyue@163.com

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 20, 2017; final manuscript received March 1, 2018; published online April 9, 2018. Assoc. Editor: Ronald Breault.

J. Energy Resour. Technol 140(8), 082204 (Apr 09, 2018) (8 pages) Paper No: JERT-17-1657; doi: 10.1115/1.4039659 History: Received November 20, 2017; Revised March 01, 2018

In this report, the influence of pre-oxidation degree and ventilation flow on the parameters of spontaneous combustion of coal (temperature, gas concentration, and exothermic intensity) was studied in six sets of programed temperature experiments. The experimental results showed that the pre-oxidation exerted a positive effect on the spontaneous combustion parameters of coal in the early stage of coal-oxygen recombination reaction, but exerted an inhibitory effect in the later stage of coal-oxygen oxidation reaction. Air supply rate had a positive correlation with the initial oxidation of coal samples and 90 °C pre-oxidation spontaneous combustion parameters. Air supply rate had negative correlation with 140 °C pre-oxidation of coal samples. Meanwhile, secondary oxidation significantly reduced the characteristic temperature of coal. The critical temperature of each coal sample was 83.7 °C (coal sample 1-Y), 68.3 °C (coal sample 1-L), 69.6 °C (coal sample 1-G), 82.1 °C (Coal sample 2-Y), 70.4 °C (coal sample 2-L), and 70.0 °C (coal sample 2-G), and dry cracking temperature was 142.6 °C (coal sample 1-Y), 134.8 °C (coal sample 1-L), 136.2 °C (coal sample 1-G), 147.2 °C (coal sample 2-Y), 136.5 °C (coal sample 2-L), and 134.4 °C (coal sample 2-G). The curves of the characteristic parameters of primary and secondary oxidized coal showed exponential growth. And the oxidation process can be divided into three stages, the first stage (30 °C ∼ critical temperature), the second stage (critical temperature ∼ dry cracking temperature), and the third stage (over the dry temperature).

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Figures

Grahic Jump Location
Fig. 1

Schematic diagram of temperature programed system

Grahic Jump Location
Fig. 2

Coal temperature and heating rate curve: (a) coal temperature and (b) coal heating rate

Grahic Jump Location
Fig. 3

CO concentration increase curve

Grahic Jump Location
Fig. 4

Heat liberation intensity increase curve: (a) minimum heat liberation intensity and (b) maximum heat liberation intensity

Grahic Jump Location
Fig. 5

CO generation rate and C2H4 concentration increase curve: (a) CO generation rate and (b) C2H4 concentration

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