Non-isothermal combustion experiments of different additive amounts of biomass char(0%

20%

40%

60%

80%

100%

mass fraction)were conducted by synthesized thermogravimetry analyzer(STA409 PC)from room temperature to 900 ℃ in air atmosphere.The changes of combustion characteristic parameters of pulverized coal in different conditions were analyzed.The results showed that

burning coal blended with biomass char was beneficial to enhancing the combustion characteristics.DTG curves of coal combustion moved to low temperature zones when the amount of biomass char increased.It indicated that both ignition and burnout temperature decreased

the burnout time shortened

the combustion characteristic index increased

and the combustion performance of blending coal were enhanced.The iso-conversional method involving Flynn-Wall-Ozawa(FWO)and Kissinger-Akahira-Sunose(KAS)model were adopted for the kinetic analysis of the main combustion process.The results indicated that

when the additive amount of biomass char varied from 0% to 100%

the activation energy decreased

which was 156.74kJ/mol

153.59kJ/mol

149.61kJ/mol

143.26kJ/mol

129.26kJ/mol

65.16kJ/mol

respectively.