| The paper put1/3coking coal for the object to study the influence of oxidation history on its spontaneous combustion. Using gas chromatograph,fresh coal and oxidized coal gaseous products generated law are studied. Propose that coal spontaneous combustion is a temperature rising,system energy is increasing,while the activation energy of coal molecule functional groups continue to reduce process. Using surface area and pore size analyzer,pore structure of fresh coal and oxidized coal are studied. Propose that coal surface area,pore size distribution and pore shape with the change law of oxidation temperature and oxidation time. Using coal spontaneous combustion tendency tester,the change rule of different coal samples physical oxygen sorption are studied. Propose that coal physical oxygen sorption have a positive correlation with its specific surface area. Using FTIR,different degree oxidation coal samples infrared spectral characteristics are studied. Propose various functional groups of coal molecule with the change law of oxidation temperature and oxidation time. Determine the main functional groups of coal oxidation reaction, and their variation characteristics in the process of coal oxidation. Using thermal analysis techniques,coal samples ignition point with the change law of oxidation temperature and oxidation time are studied. The chemical reaction kinetics of various stages of coal oxidation find that oxidation will not influence the reaction mechanism of coal and oxygen. On this basis, activation energy of different stages of coal reaction with the change law of oxidation temperature and oxidation time were studied. |
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