气化松焦油在SiO2作用下的燃烧特性及燃烧动力学

摘要

为研究生物质气化焦油在SiO2作用下的燃烧特性,用松树皮在水冷式固定床生物质气化炉进行气化实验,将炉膛内黏附的焦油在SiO2作用下进行热质量实验,并进行燃烧特性分析及动力学分析.研究结果表明:少量的SiO2能改善气化松焦油的可燃性、稳燃性和燃尽性;当添加剂质量达到焦油质量的18.7％左右时,可燃性和稳燃性迅速下降,试样的燃尽性达到最佳;少量SiO2的加入在水分及轻质油挥发阶段增加了吸热量,在燃烧阶段活化能从14.75 kJ/mol下降到8.85 kJ/mol;SiO2质量与焦油质量的比值不能过大,否则过多的吸热量仍将影响其着火及燃尽特性.%In order to study combustion characteristics of biomass gasification tar acted on by SiO2,tar adhering to the furnace was investigated by thermo-gravimetric analyzer (TGA) after pine bark was gasified in the water-cooled biomass pyrolysis gasifier,and combustion characteristics and combustion kinetics were studied.The results show that ignition characteristics,combustible characteristics,combustible stability and burnout characteristics can be improved by blending a small amount of SiO2.Ignition characteristics,combustible characteristics drop rapidly,burnout characteristics reach the maximum when the quality of SiO2 is about 18.7％ of the tar.Endothermic quantity increases in the stage of water and light hydrocarbons volatilization,activation energy decreases from 14.75 kJ/mol to 8.85 kJ/mol in the combustion stage by blending a small amount of SiO2.The ratio of the tar quality to SiO2 quality can not be too high,otherwise the excessive heat absorption will affect the ignition and burnout characteristics.