Co-firing characteristics of different types of coal(bitumite

lean coal

anthracite) and biomass(rice husks) blends were studied using thermogravimetric analyzer. The influence of the combustion atmosphere(O_2/CO_2O_2/N_2)

bio-blending ratio and oxygen concentration on ignition temperature

burnout temperature

comprehensive combustion characteristics and kinetic property of the blends were investigated. The results show that

the mass loss rate trend of the blends in O_2/N_2 atmosphere was similar to that in O_2/CO_2 atmosphere

but in O_2/CO_2 atmosphere

the weight loss rate of the blends was faster

the activation energy of the fixed carbon was higher

and the comprehensive combustion characteristic index was lower. Co-firing with biomass could improve the combustion characteristics of pure coal. Compared with burning coal only

the ignition and burnout temperature of the coalbiomass blends decreased

indicating the combustion characteristics of the coal were enhanced. With the increasing bio-blending ratio

the co-combustion performance was improved further. By increasing the oxygen concentration

the co-combustion rate speeded up

the ignition and burnout temperature declined

and the comprehensive combustion characteristics became better. However

in the fixed carbon combustion stage

the activation energy and pre-exponential factor of the combustion reaction increased. Near the temperature corresponding to the maximum burning rate of fixed carbon

the activation energy of the co-combustion was lower than that of the only-coal combustion

and with the increasing proportion of biomass

the activation energy of the blended fuel reduced.