煤欠氧氧化过程中气体与官能团变化规律OA

To elucidate the regulatory mechanism of oxygen volume fraction on gas emission and functional group evolution during coal oxidation,coal oxidation experiments were carried out at 21％,10％,and 5％oxygen volume fractions by using thermogravimetric-Fourier transform infrared spectroscopy-mass spectrometry(TG-FTIR-MS)and in situ infrared spectroscopy.Results of research demonstrate that increased oxygen volume fraction lowers characteristic temperature points and increases maximum weight loss rates during coal oxidation.CO and CO2 release significantly increases;reactions initiate earlier and terminate faster under high oxygen conditions,while low oxygen prolongs reaction cycles.Ethylene(C3H6)exhibits insensitivity to oxygen volume fraction and can serve as a spontaneous combustion indicator gas in low-oxygen environments.High oxygen promotes oxygen-containing functional group cycling and alkyl side-chain cleavage,while low oxygen inhibits this process.Oxygen volume fraction does not alter the fundamental oxidation pathway of coal but influences reaction kinetics and self-ignition tendency by regulating oxygen supply.These findings provide theoretical support for coal self-ignition early warning systems and the development of inhibition materials.