Research On Microscopic Mechanism Of Lignite Fast Transform Under Normal Temperature

This thesis mainly discussed that lignite occurred natural oxidation problems at normal temperature,research on the change reason of lignite quality and change law of molecular structure,according to lignite thermogravimetric analysis experimental discussed Characteristic temperatures and the activation energy of the coal spontaneous combustion natural ignition and analysed the coal of spontaneous combustion natural ignition tendency;According to low-temperature oxidation dynamic calculation of coal obtained spontaneous combustion period indexes of coal layer.Using temperature setting far-infrared spectral experimental Study on the characteristics of temperature and concentration for low temperature oxidation gases of spontaneous combustion of coal seam,to establish the relationship between the formation amount of gas marker and the temperature, The analysis and comparison with lignite?non-caking coal?long flame coal?gas coal?weakly caking coal and coking coal by using fourier transform infrared spectral experimental,with increasing metamorphic grade,phenolic hydroxyl of coal molecules structure proportion aliphatic hydrocarbon and cycloalkane reduce, structured degree of aromatic have high proportion.