气化松焦油在SiO_2作用下的燃烧特性及燃烧动力学

Combustion characteristics and combustion kinetics of gasification pine tar acted on by SiO_2

为研究生物质气化焦油在SiO_2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SiO_2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SiO_2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SiO_2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 k J/mol下降到8.85 k J/mol;SiO_2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 SiO_2, 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 SiO_2. Ignition characteristics, combustible characteristics drop rapidly, burnout characteristics reach the maximum when the quality of SiO_2 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 k J/mol to 8.85 k J/mol in the combustion stage by blending a small amount of SiO_2. The ratio of the tar quality to SiO_2 quality can not be too high, otherwise the excessive heat absorption will affect the ignition and burnout characteristics.