科研之友
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摘要
Combustion is the main approach for the heat utilization of solid fuels, and it is significant for understanding their dynamic combustion process to improve the heat transfer efficiency and safe operation of the equipment. In this paper, laser-induced breakdown spectroscopy(LIBS) was applied to the dynamic analysis of combustion products of single particle solid fuels under different atmospheres, including H, O, N, CN, Na and K. The residual laser energy transmitted through the flame and the image of the solid fuel flame obtained using a high-speed camera were combined to investigate the effect of combustion atmosphere on the devolatilization, volatile combustion and the char burning process. In addition, the impact of changes in combustion characteristics on the alkali release at oxy-fuel atmosphere was also focused. Results indicated that the maximum volatile concentration during the ignition process is relevant to the gas-phase ignition time, and the volatile release rate of biomass fuel is higher in the O2/CO2 environment. CO2 not only forms the less volatile K2CO3 through the recombination reaction with K, but also decreases the flame temperature to reduce the release rate of alkali.
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