Study on thermogravimetric characteristics and key functional groups of coal spontaneous combustion
To investigate the key functional groups that play a crucial role in the thermogravimetric process of coal spontane-ous combustion,three types of coal samples with different metamorphic degrees were selected as the research object.Accord-ing to the TG thermogravimetric experiment and Fourier transform infrared experiment,the characteristic temperature and functional groups variation law of the thermogravimetric process of coal spontaneous combustion were studied,then the correla-tion between the weight loss of coal spontaneous combustion and the functional groups was analyzed based on the frequency ratio model method and the grey correlation degree,and the key functional groups in the thermogravimetric process of coal spontaneous combustion with different metamorphic degrees were discussed.The results show that with the deepening meta-morphic degree of coal,the thermogravimetric curve moves backward,and the thermogravimetric characteristic temperature from lignite to anthracite increases by 22%and 37%,respectively.With the increase of temperature,the temperature point of the mutation of functional groups content is close to the characteristic temperature,and the hydroxyl group decreases exponen-tially before 150℃and then tends to be stable,while the aliphatic hydrocarbon,oxygen-containing functional groups and aro-matic hydrocarbon decrease linearly after the ignition temperature.The key functional groups affecting the thermogravimetric process of coal spontaneous combustion with different metamorphic degrees are inconsistent.C—C is the key functional group affecting the thermogravimetric process of lignite,while methyl is the key functional group affecting the thermogravimetric process of bituminous coal and anthracite.The research results can provide important reference value for the determination of key functional groups in the thermogravimetric process of coal spontaneous combustion.
coal spontaneous combustionthermogravimetric characteristicsrelevancekey functional groupfrequency ra-tio model
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