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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August 2018
Research-Article
Secondary Spontaneous Combustion Characteristics of Coal Based on Programed Temperature Experiments
Gang Wang,
Gang Wang
Mine Disaster Prevention and Control-Ministry
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China;
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
Mine Disaster Prevention,
North China Institute of Science and Technology,
Beijing 101601, China
e-mail: Gang.Wang@sdust.edu.cn
Search for other works by this author on:
Qiqi Liu,
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
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: 15764227280@139.com
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Lulu Sun,
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
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: sunsdust@126.com
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Xiang Song,
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
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: 15764250761@163.com
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Wenzhou Du,
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
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: duwenzhou-01@163.com
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Daocheng Yan,
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
and Fire Control,
Ministry of Education,
China University of Mining and Technology,
Xuzhou 221116, Jiangsu, China
e-mail: ydc19940214@163.com
Search for other works by this author on:
Yue Wang
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
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China
e-mail: sdkdwangyue@163.com
Search for other works by this author on:
Gang Wang
Mine Disaster Prevention and Control-Ministry
of State Key Laboratory Breeding Base,
Shandong University of Science and Technology,
Qingdao 266590, Shandong, China;
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
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
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
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
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
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
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
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. Aug 2018, 140(8): 082204 (8 pages)
Published Online: April 9, 2018
Article history
Received:
November 20, 2017
Revised:
March 1, 2018
Citation
Wang, G., Liu, Q., Sun, L., Song, X., Du, W., Yan, D., and Wang, Y. (April 9, 2018). "Secondary Spontaneous Combustion Characteristics of Coal Based on Programed Temperature Experiments." ASME. J. Energy Resour. Technol. August 2018; 140(8): 082204. https://doi.org/10.1115/1.4039659
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