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首页> 外文期刊>Combustion science and technology >Thermal Behavior and Characteristics of Functional Groups on Lignite Secondary Oxidation
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Thermal Behavior and Characteristics of Functional Groups on Lignite Secondary Oxidation

机译：Thermal Behavior and Characteristics of Functional Groups on Lignite Secondary Oxidation

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At present, the thermal behavior of lignite and the reaction process of functional groups during secondary oxidation have not been accurately explained. Therefore, the macro thermal behavior and micro characteristics of spontaneous combustion of lignite during secondary oxidation were studied. Coal samples were pre-oxidized to 80 degrees C, 120 degrees C, 160 degrees C, and 200 degrees C (labeled as raw coal, C-80, C-120, C-160, and C-200, respectively). A thermogravimetric (TG) analyzer and Fourier-Transform Infrared (FTIR) spectrometer were used. The results showed that the high adsorption temperature T(1)and critical temperature T(2)of C-80 were higher than those of raw coal by 4.41 degrees C and 11.07 degrees C, respectively. They indicated that pre-oxidation inhibited the low-temperature oxidation process. The active temperature T(4)gradually decreased from C-80 to lower than that of raw coal. The T(4)of C-200 was about 20 degrees C lower than that of raw coal, proving that pre-oxidation accelerated oxygen absorption and the weight-gaining process. The activation energy of pre-oxidized coal samples was significantly lower than that of raw coal samples. The C-80 and C-120 samples had the lowest activation energies: 114.542 kJ/mol and 114.539 kJ/mol, respectively. The content of free hydroxyl groups in pre-oxidized coal samples decreased in general. At C-120, the aliphatic hydrocarbon generation rate significantly increased, and the percentage of peak area continued to increase. During secondary oxidation of C-120 coal samples, various absorption peaks gradually enhanced. Consequently, C-120 was more prone to spontaneous combustion during secondary oxidation.

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