- Title
- Chemical structure changes during oxidation self-heating of lignite
- Creator
- Zhao, H; Xing, B; Li, Y; Tahmasebi, A; Li, J; Zheng, W; Geng, X; Yu, J
- Relation
- Meitan Zhuanhua/Coal Conversion Vol. 40, Issue 2, p. 1-5
- Relation
- https://academic.naver.com/search.naver?query=Meitan+Zhuanhua+40%EA%B6%8C+2%ED%98%B8&searchType=1&field=3&docType=1
- Publisher
- Taiyuan Ligong Daxue
- Resource Type
- journal article
- Date
- 2017
- Description
- A rapid self-heating of lignite during low temperature oxidation and spontaneous combustion was monitored by programmable changing oven temperature. Changes of chemical structure of the coal during self-heating was investigated by FTIR analysis. Temperature of the coal in air increased monotonically, successively exceeding the separation point temperature (tsp), the crossing point temperature (tcp) and combustion temperatures (tc1, tc2). The decrease of methyl and methylene and increase of n (—CH3) ∶ n (—CH2—) during self-heating of lignite indicate that the more methylene is attacked by oxygen during oxidation. Ar—O—CO—R and R—O—CO—R increase progressively, and decrease after tc1 in response to hydrolysis of the esters. The increasing Ar—CO—Ar during self-heating decomposes to generate gaseous oxidation products above tcp. Aromatic C=C insignificantly changes up to tc1, and decreases thereafter. After coal temperature reaches to tsp, Ar—COOH increases gradually, and then decreases above tc1 because of the decarboxylation, dehydration and esterification. Ar—COO— increases gradually during self-heating, but decreases above tc1 because very high oxidation temperature enhances the decomposition of the group.
- Subject
- lignite; oxidation; self-heating; FTIR; chemical structure
- Identifier
- http://hdl.handle.net/1959.13/1446572
- Identifier
- uon:42906
- Identifier
- ISSN:1004-4248
- Language
- eng
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