Combustion Characteristics and Influencing Factors of Coal Semi-coke and Biomass Blends under O2/N2 and O2/CO2 Atmospheres
To understand the combustion characteristics and influencing factors of coal semi-coke and bi-omass blends under O2/N2 and O2/CO2 atmospheres,an automated physical and chemical adsorption in-strument was used to obtain the pore structure of semi-coke and biomass blends,and thermogravimetric experiments were carried out to analyze the co-combustion characteristics and reaction kinetics in this paper.In addition,multiple linear regression method was implied to investigate the relationship among the combustion characteristics parameters,fuel ratio and pore structure.The results indicated in O2/N2 atmosphere,the ignition,burnout and comprehensive combustion characteristics of coal semi-coke were improved by blending of biomass.However,in O2/CO2 atmosphere,blending of biomass can improve the ignition characteristics of semi-coke,yet delay the burnout of semi-coke.The activation energy of the blends exhibited significant differences in the low-temperature and high-temperature zones.As the blending ratio of biomass increased,the activation energies in both temperature zones gradually de-creased.The activation energies in low-temperature zone were close in the two atmospheres,while the activation energies in high-temperature zone in O2/CO2 atmosphere were observably higher than those in O2/N2 atmosphere.In O2/N2 atmosphere,the pore structure had a more significant impact on the com-bustion characteristics.While in O2/CO2 atmosphere,the fuel ratio had more notable effect on the co-combustion characteristics.
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