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research-article

Study on the Reoxidation Characteristics of Soaked and Air-dried Coal

[+] Author and Article Information
Lulu Sun

Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, PR China; Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China
sunsdust@126.com

YanBo Zhang

Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, PR China
ttzhangyanbo@163.com

Yue Wang

Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, PR China
sdkdwangyue@163.com

Qiqi Liu

Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, PR China
15764227280@139.com

1Corresponding author.

ASME doi:10.1115/1.4041407 History: Received April 02, 2018; Revised September 06, 2018

Abstract

After coal seam mining, the residual coal is soaked with the accumulated water in goaf and its spontaneous combustion characteristics was changed after air-dried. To study the reoxidation characteristics of soaked and air-dried coal, temperature programmed experiments were carried out and the cross point temperatures and index gases were studied. Results showed that the cross point temperature of raw coal (146.3 ?) was reduced to 137.1 ? after it was pre-oxidized at 90 ?. The cross point temperature of water-soaked and air-dried coal (96 h) was 122.5 ? and that of water-soaked, air-dried (96 h) and pre-oxidized (90 ?) coal was 111.5 ?. Little CO was produced in the initial slow oxidation phase, and C2H4 and C3H8 were not generated. In the rapid oxidation stage, different pretreatments affected the gas generation and the overall oxidative degree was consistent with the cross point temperature. The generation temperature and the concentration of C2H4 and C3H8 were decreased after the coal was water-soaked, air-dried and pre-oxidized. The high-energy chemicals and functional groups were studied to explain the physical experiment oxidation characteristics of different coals.

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