In order to take full use of the agricultural biomass straw and bituminous coal

the thermogravimetric-differential thermogravimetric-differential scanning calorimetry(TG-DTG-DSC)thermal analysis technology was employed to conduct thermogravimetric experiment on straw

bituminous coal and their mixtures.The combustible characteristics

ignition performance

burnout feature and comprehensive combustion characteristics of the fuels were investigated.Moreover

the combustion mechanism of the mixed fuel was analyzed

and kinetics parameters of the combustion were calculated.The results show that

DTG curves of the mixture of straw and bituminous coal appeared two peaks.With an increase in the proportion of straw in the mixture

an upward endothermic peak gradually appeared on the DSC curve

between the two peaks on the DTG curves.The ignition temperature of the mixed sample was much lower than that of the bituminous coal.The mixture S6 had the lowest ignition temperature and burnout temperature.Its maximum and average reaction speed was higher than that of other mixtures.The combustible characteristics index

ignition performance index

burnout feature index and comprehensive combustion characteristics index of S6 were much higher than that of other mixed fuels and the bituminous coal.Furthermore

these indexes of S6 increased with the proportion of straw.The early burning stage of the mixed fuels was mainly homogeneous ignition

while the late stage was multiphase ignition.The reaction order of the mixed fuels at low/high temperature was about 1.5/0.4.The reaction activation energy and frequency factor at low temperature were larger than that at high temperature

reflecting consistency of variation of the activation energy and frequency factor.Properly adding biomass straw was beneficial to promoting full combustion of the bituminous coal

which will improve the combustion efficiency and reduce the net environmental pollution.