Abstract:Co-combustion experiment of Huadian oil shale semi-coke and corn straw was conducted by TGA/DSC1 thermogravimetric analyzer in air atmosphere. The influence of heating rate and mass ratio on the characteristic parameters of the mixture is studied, and compared with the combustion characteristics of single oil shale semi-coke. The results showed that the volatile initial precipitation temperature and ignition temperature of mixed samples are much lower than oil shale semi-coke, but it slightly higher than corn straw. The volatile initial precipitation temperature and ignition temperature of the mixed sample are increased with the increase of heating rate. When the heating rate is constant, the combustion process presents the trend to the low temperature zone, the peak value of the low temperature section is high and intense release of volatile, thus improved combustion characteristics of the mixtures. When the mass ratio of corn stalk was greater than 10%, the combustion characteristics of the mixed sample are also increased. RMS and MR values are used to evaluate the mutual influence of the co-combustion process, the study showed that main effects of the interaction occurred in second, third and fourth stages, the second and third stages are the favorable effects, and the fourth stage is the adverse effect and when the mass ratio of the semi coke and the corn straw is 7:3, the mutual influence is the best. KAS model is applied to analyze co-combustion kinetics of the blends. The results show that activation energy presents a rising tendency during the impelling of reaction, which is unanimous to the change law of TG - DTG curves. The results can provide reference for efficient combustion of oil shale semi-coke and corn straw.