Study on Effect of Oxygen Concentration on the Adsorption Characteristics of Lignite
Coal spontaneous combustion is one of the main disasters threatening the safety of mine production,and oxygen plays an obvious role in regulating the occurrence and development of coal spontaneous combustion,in which coal oxygen adsorption is the key step affecting coal spontaneous combustion reaction.Taking lignite as the research object,the change rules of coal pore structure parameters and functional groups under different oxygen concentrations were studied by low-temperature nitrogen adsorption method and infrared spectroscopy,respectively.The effect of oxygen concentration on oxygen adsorption capacity and adsorption heat of coal was studied by PCTPro-C80 combined experiment.The results show that the specific surface area and pore volume of coal increase with the increase of oxygen concentration,and the pore volume of coal is mainly mesoporous.With the increase of oxygen concentration,the content of groups such as-Ar-CH,—CH2-CH3 and-OH decreases on the micro level,while the adsorption capacity and adsorption heat of coal increase on the macro level.When the oxygen concentration is 13％,the specific surface area,pore volume,adsorption capacity and adsorption heat of coal show a decreasing trend,and the content of—CH2-CH3 group decreases the fastest,with a decreasing degree of 18.11％.
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