Study on co-pyrolysis kinetics of coal direct liquefaction residue and lignite

In order to solve a softening and melting of the coal liquefaction residues and serious swelling hard to be utilized during the py-rolysis process,when the te mperature scope was ranging from 30 ~ 900 °C and a condition of temperature rising rate was 10,20,30 and40。C 1 min individually,with a thermo gravimetric analyzer,a pro grammed temperature rising co-pyrolysis test was conducted with the coaldirect liquefaction residues and lignite. A Doyle method was applied to analyze the co-pyrolysis ki netics and an interaction was conductedon the kinetics results and the co-pyrolysis synergetic effect. The results showed that the co-pyrolysis could be described three seri es firstgrade reaction and the temperature interval was 200 ~ 310,310 ~ 470 and 470 ~ 900 °C individually. Among them,310 ~ 470 °C was activeresolution stage of the co- pyrolysis reaction and the reaction activation energy(40 ~ 50 k J/ mol) was far higher than the low and high tem-perature reaction activation energy(10 ~ 20 k J/ mol). The C o-pyrolysis of the liquefaction residues and lignite would reduce the reactionactivation energy of the active solution stage,could speed up the reaction rate,could increase t he pyrolysis weight loss rate and could makethe co-pyrolysis reaction with positive synergetic effect at temperature of 300 ~ 550。C.