DOI: 10.11799/ce201708005
Research on spontaneous combustion of lignite under high-pressure and pure-oxygen
JING Tian
WANG Yu
ZHAO Xue
LI Yu-long
WANG Zhe
Abstract：In order to develop the deep lignite underground gasification non-contact ignition pressurization oxidation process,pressurized TGA experiments were carried,to study the temperature of coal spontaneous ignition characteristics and the change rule of kinetic parameters in pure oxygen atmosphere under different pressure.The results showed that when the pressure rises form atmospheric pressure to 2.0MPa,weight-loss-start temperature T1 rises from 230.3℃ to 241.4℃,ignition temperature T2 drops from 360.5℃ to 315.4℃,maximum weight-loss temperature T3 drops from 413.0℃ to 373.1℃,and the characteristic temperature points change in linear relationship just like the pressure changes;the activation energy E drops from 36.652 kJ/mol to 13.766 kJ/mol and pre-exponential factor A drops from 0.03479 s-1 to 0.00079 s-1.Besides,activation energy E and pre-exponential factor A decreases with the increase of pressure.Therefore,high pressure of oxygen makes spontaneous combustion of lignite easier,which is conducive to coal seam ignition.
Keywords：lignite underground gasificationspontaneous combustionpressurized TGAcharacteristic temperature pointsdynamical parameter
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 17-19,23 )