scholarly journals Oxidation Characteristics of Functional Groups in Relation to Coal Spontaneous Combustion

2020 ◽  
Author(s):  
Yutao Zhang ◽  
Jing Zhang ◽  
Yaqing Li ◽  
Sheng Gao ◽  
Chaoping Yang ◽  
...  
Keyword(s):  
Free Radicals ◽  
Survival Time ◽  
Functional Groups ◽  
Spontaneous Combustion ◽  
Aliphatic Hydrocarbons ◽  
Coal Spontaneous Combustion ◽  
Oxidation Characteristics ◽  
The Stability ◽  
Main Components

Abstract To investigate the mechanism of coal spontaneous combustion, distributions, evolutions, and oxidation characteristics of functional groups in different coals were characterized by employing in-situ FTIR, EPR, and TG/DSC-FTIR experiments. Experimental results indicated that -OH was the most active groups of coal spontaneous combustion. It not only could react with the absorbed oxygen spontaneously but also thebe the main product of the chemisorption. Consequently, -OH was believed to contribute most both for the loss and increase of coal massduring the process of spontaneous combustion. Aliphatic hydrocarbons were the main components to form -C-O-O• and could be further oxidized into C = O. However, reactions between aliphatic hydrocarbons and oxygen were non-spontaneous.EPR experiments suggested that the tendency of coal spontaneous combustion acutely depended on the stability and survival time of free radicals. The more stable and longer survival time of free radicals are, the lower tendency of coal spontaneous combustion is.

Ultrasonic extraction and oxidation characteristics of functional groups during coal spontaneous combustion

Fuel ◽  
2019 ◽  
Vol 242 ◽  
pp. 287-294 ◽  
Author(s):  
Yutao Zhang ◽  
Chaoping Yang ◽  
Yaqing Li ◽  
Yao Huang ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Functional Groups ◽  
Spontaneous Combustion ◽  
Ultrasonic Extraction ◽  
Coal Spontaneous Combustion ◽  
Oxidation Characteristics

scholarly journals Oxidation Characteristics of Functional Groups in Relation to Coal Spontaneous Combustion

ACS Omega ◽  
2021 ◽  
Author(s):  
Yutao Zhang ◽  
Jing Zhang ◽  
Yaqing Li ◽  
Sheng Gao ◽  
Chaoping Yang ◽  
...  
Keyword(s):  
Functional Groups ◽  
Spontaneous Combustion ◽  
Coal Spontaneous Combustion ◽  
Oxidation Characteristics

B-Mode Grey Relational Analysis of Surface Functional Groups Change Rules in Coal Spontaneous Combustion

2011 ◽  
Vol 236-238 ◽  
pp. 762-766 ◽  
Author(s):  
Wei Qing Zhang ◽  
Shu Guang Jiang ◽  
Lan Yun Wang ◽  
Zheng Yan Wu ◽  
Hao Shao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Functional Groups ◽  
Grey Relational Analysis ◽  
Spontaneous Combustion ◽  
Surface Functional Groups ◽  
Low Temperature Oxidation ◽  
Coal Spontaneous Combustion ◽  
Temperature Oxidation ◽  
Relational Analysis ◽  
Grey Relational

Based on the results of Fourier Transform Infrared Spectroscopy (FTIR) test of surface functional groups of different coal samples in low-temperature oxidation, the quantitative variation between functional groups and temperature was analyzed by B-mode grey relational analysis. According to the grey B-mode degrees and orders, a summary is given that: 1)the aromatic ketone and aldehyde carbonyl groups are mostly produced during the process of coal oxidation and the oxygen-containing functional groups existed mainly in the form of stable ether bond; 2)the methylene groups make major contribution to coal spontaneous combustion, so that the methylene structures should be disposed firstly in order to suppress coal spontaneous combustion effectively; 3)the degree range of gas coal is the largest, which shows that the process of gas coal spontaneous combustion is mostly affected by active groups to some extent. These quantitative results will be helpful to find the functional groups affecting deeply the process of low-temperature oxidation of coal.

Reaction pathways and cyclic chain model of free radicals during coal spontaneous combustion

Fuel ◽  
2021 ◽  
Vol 293 ◽  
pp. 120436
Author(s):  
Liangzhou Chen ◽  
Xuyao Qi ◽  
Jie Tang ◽  
Haihui Xin ◽  
Zhongqiu Liang
Keyword(s):  
Free Radicals ◽  
Spontaneous Combustion ◽  
Reaction Pathways ◽  
Chain Model ◽  
Coal Spontaneous Combustion

Quantum Chemical Application in Inhibitor Suppressed the Spontaneous Combustion of Coal

2012 ◽  
Vol 524-527 ◽  
pp. 658-661
Author(s):  
Feng Wei Dai
Keyword(s):  
Quantum Chemical ◽  
Spontaneous Combustion ◽  
The Other ◽  
Coal Spontaneous Combustion ◽  
Chemical Application ◽  
Form Complex ◽  
Spontaneous Combustion Of Coal ◽  
The Stability ◽  
The One ◽  
Complex Increase

Coal spontaneous combustion needs to have enough oxygen and heat, on the one hand, water salts inhibitor can isolate from coal exposure to air; on the other hand, water salts inhibitor interact with active groups in coal to form complex, increase the stability of coal and boost the heat of spontaneous combustion of coal. This paper has made use of quantum chemical calculation’s software Gaussian 03 to calculate the complex what coal’s active groups and Ca2+ inhibitor interacted to form, and research the mechanism for inhibitor suppressed the spontaneous combustion of coal.

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