Citation: BAN Yan-peng, TANG Yan-hua, WANG Jie, HAN Meng-xin, TE Gu-si, WANG Yan, HE Run-xia, ZHI Ke-duan, LIU Quan-sheng. Effect of inorganic acid elution on microcrystalline structure and spontaneous combustion tendency of Shengli lignite[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(9): 1059-1065. shu

Effect of inorganic acid elution on microcrystalline structure and spontaneous combustion tendency of Shengli lignite

Department of Chemical Engineering, Inner Mongolia University of Technology, Inner Mongolia University of Technology, Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resource, Huhhot 010051, China

Corresponding author: ZHI Ke-duan, zhikeduan@gmail.com LIU Quan-sheng, liuqs@imut.edu.cn
Received Date: 23 November 2015
Revised Date: 25 January 2016

Fund Project: the Natural Science Foundation of Inner Mongolia-China 2015BS0206the National Natural Science Foundation of China 21566029the National Natural Science Foundation of China 21566028the Science and Research Projects of IMUT-China ZS201138the Natural Science Foundation of Inner Mongolia-China 2016BS0204the National Natural Science Foundation of China 21266017the Natural Science Foundation of Inner Mongolia-China 2014MS0220

Figures(8)

XRD, Raman, XPS and FT-IR were used to examine microcrystalline structure changes of Shengli lignite eluted by inorganic acid (HCl, H₂SO₄ and HCl-HF). By adopting a designed surface adsorption instrument-GC, the samples were oxidized at low temperature through pulse method to investigate their oxygen adsorption under different temperatures. Via low-temperature oxidation, TG/DTG and fixed bed combustion tests, the spontaneous combustion tendency of coal samples were investigated. The results show that the removal of minerals increases the degree of order and graphitization of the coal structure. Compared with raw coal, oxygen absorption of inorganic acid elution samples decreases obviously. With the increase of adsorption temperature, oxygen absorption capacity increases significantly, but decreases with the increasing level of removed minerals, which reduces spontaneous combustion tendency of the treated coal.
- Shengli lignite,
- inorganic acid elution,
- microcrystalline structure,
- low-temperature oxidation,
- spontaneous combustion tendency
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